Researcher Profile and Settings

Master

Affiliation (Master)

• Faculty of Engineering　Division of Architecture　Research Group of Structural Engineering and Materials

Affiliation (Master)

• Faculty of Engineering　Division of Architecture　Research Group of Structural Engineering and Materials

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Profile and Settings

Affiliation

• Hokkaido University, Faculty of Engineering, Associate Professor

Degree

• Dr.Eng.（2006/03 The University of Tokyo）

Profile and Settings

• Name (Japanese)

  Kitagaki

• Name (Kana)

  Ryoma

• Name

  202101005087416092

Alternate Names

https://aml.eng.hokudai.ac.jp/

Affiliation

• Hokkaido University, Faculty of Engineering, Associate Professor

Achievement

Research Interests

• Concrete Engineering, Maintenance and repair, Polymer, Insulation, Material Cycles and Waste Management, CO2, Carbon recycle, Building materials, Durability   

Research Areas

• Social infrastructure (civil Engineering, architecture, disaster prevention) / Building structures and materials / Concrete Engineering, Maintenance and repair, Polymer, Insulation, Material Cycles and Waste Management, CO2, Carbon recycle, Building materials, Durability

Research Experience

• 2022/04 - Today Hokkaido University Faculty of Engineering professor
• 2018/09 - Today Hokkaido University Faculty of Engineering Associate Professor
• 2011/04 - 2018/08 The University of Tokyo The Graduate School of Engineering Department of Architecture Associate Professor
• 2008/04 - 2011/03 The University of Tokyo The Graduate School of Engineering Department of Civil Engineering Assistant Professor
• 2006/06 - 2008/03 The University of Tokyo The Graduate School of Engineering Department of Civil Engineering
• 2006/04 - 2006/05 The University of Tokyo The Graduate School of Engineering Department of Architecture

Education

• 2003/10 - 2006/03  The University of Tokyo  The Graduate School of Engineering  Department of Architecture
• 2000/04 - 2003/09  The University of Tokyo  The Graduate School of Engineering  Department of Architecture
• 2001/09 - 2002/09  Technische Universitaet Wien
• 1996/04 - 2000/03  The University of Tokyo  The Faculty of Engineering  Department of Architecture

Committee Memberships

• 2020/04 - Today   The International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM)   TC-DOC Committee
• 2020/04 - Today   The International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM)   TC-IMC Committee
• 2020/04 -2021/03   Japan Concrete Institute   Technical training committee

Awards

• 2017 National Institute of Informatics IDR User Forum Best poster award
  
• 2016 Japan Society for Finishing Technology Award for Research and Development
  
• 2010 Japan Society for Finishing Technology Award for Outstanding Young Researcher
  
• 2010 SB2010 Seoul Award of Excellency in Research
  
• 2007 SB2007 Seoul Award of Excellency in Research
  

Published Papers

• Plugging effect of fine pore water in OPC and LC3 paste during accelerated carbonation monitored via single-sided nuclear magnetic resonance spectroscopy

  Luge Cheng, Ryo Kurihara, Takahiro Ohkubo, Ryoma Kitagaki, Atsushi Teramoto, Yuya Suda, Ippei Maruyama

  Cement and Concrete Research 186 107688 - 107688 0008-8846 2024/12
• ITZ properties of LWA surroundings in high strength mortar according to LWA/sand with relative humidity

  Sujeong Pyeon, Gyuyong Kim, Byungcheol Choi, Dayoung Oh, Yubin Leem, Ryoma Kitagaki, Jeongsoo Nam

  Construction and Building Materials 2024/11
• Exploring the reinforcing mechanism of graphene oxide in cementitious materials through microstructural analysis of synthesised calcium silicate hydrate

  Mylvaganam Nithurshan, Yogarajah Elakneswaran, Yuya Yoda, Keiichi Yano, Ryoma Kitagaki, Naoki Hiroyoshi

  Cement and Concrete Composites 153 105717 - 105717 0958-9465 2024/10
• Natural carbonation boost for hardened cement fines by dripping technique

  Dayoung Oh, Ryoma Kitagaki, Takayoshi Masuo, Zhijiang Li, Ryo Kurihara, Takafumi Noguchi, Ippei Maruyama

  Cement and Concrete Composites 105731 - 105731 0958-9465 2024/08
• Understanding the Carbonation Phenomenon of C–S–H through Layer Structure Changes and Water Exchange

  Taiki Uno, Naohiko Saeki, Ippei Maruyama, Yuya Suda, Atsushi Teramoto, Ryoma Kitagaki, Takahiro Ohkubo

  The Journal of Physical Chemistry C 128 (28) 11802 - 11816 1932-7447 2024/07/08
• Long-term stability and water vapor induced degradation of physico-chemical properties of XPS and PF

  Yoobin Leem, Ryoma Kitagaki, Takato Ishida, Hideaki Hagihara

  Developments in the Built Environment 18 100429 - 100429 2666-1659 2024/04
• Multiscale computational modelling of nano-silica reinforced cement paste: Bridging microstructure and mechanical performance

  Mylvaganam Nithurshan, Yogarajah Elakneswaran, Yuya Yoda, Ryoma Kitagaki, Naoki Hiroyoshi

  Construction and Building Materials 2024/04
• Natural carbonation process in cement paste particles in different relative humidities

  Naohiko Saeki, Luge Cheng, Ryo Kurihara, Takahiro Ohkubo, Atsushi Teramoto, Yuya Suda, Ryoma Kitagaki, Ippei Maruyama

  Cement and Concrete Composites 146 0958-9465 2024/02 

  Finely ground hardened cement pastes (hcp) under 75 μm were carbonated at varying relative humidities (23–95 % RH) to determine the carbonation rate that minimized CO2 diffusion in the bulk paste. The amounts of portlandite (CH) and calcium carbonate (CC) polymorphs were quantified, and the decalcification and decomposition of C-A-S-H were analyzed using TGA, XRD, mass balance calculation, FTIR, and 29Si MAS NMR spectroscopy. A higher RH accelerated the reaction rate, and CH dissolution stopped midway at 58 % RH or below because of the loss of connectivity with the pore solution in the CC shell around CH. The precipitated CC phase included calcite at high RH, whereas all three polymorphs formed at 58 % or lower RH; amorphous CC were detected at low RH. The decalcification and decomposition of C-A-S-H were observed at 45 % or higher RH; it was rarely carbonated at 33 % or lower RH.
• Development and verification of an integrated hydration, geochemical and transport model for the hydrated cement paste exposed to an aggressive chemical environment

  Siventhirarajah Krishnya, Kirushnapillai Kopitha, Yuya Yoda, Ryoma Kitagaki, Yogarajah Elakneswaran

  Cement and Concrete Composites 146 0958-9465 2024/02 

  This study established a new transport model by using the COMSOL-IPHREEQC interface to simulate the changes in the morphology of hydrated cement paste due to the diffusion of carbon dioxide and chloride ion. A series of constitutive models such as the cement hydration model (to compute the dissolution rate of each clinker mineral), thermodynamic model (to perform the hydration reaction, reaction due to transport of ions, chemical and physical adsorption of chloride ion during the chloride ion ingression and dissolution rate of calcium-silica-hydrate (C–S–H) simultaneously with portlandite for the carbonation), porosity determination, and COMSOL Multiphysics (for the calculation of transport problems) were integrated using MATLAB language to determine the pore solution chemistry, hydrates assemblage, and porosity of the cement paste exposed to aggressive environments. During the diffusion of carbon dioxide gas, the decalcification of C–S–H was realistically considered by assuming that the Ca/Si ratio of C–S–H decreased from 1.67 (Jennite type C–S–H) to 0.67 (Tobermorite C–S–H), and then from 0.67 to 0 (silica gel). The proposed integrated platform was well verified with different sets of reported and raw experimental results and existing models, indicating a realistic predictability for chloride ion ingression and carbonation. The developed model discloses the effect of coupling the progression of hydration with reaction due to the transport of ions by using the free chloride ion profile and phase assemblages during the chloride ion ingression.
• Characteristics on compressive strength and microstructure of high-strength cementitious composites with waste glass beads

  Sujeong Pyeon, Gyuyong Kim, Byungcheol Choi, Moonkyu Kim, Ryoma Kitagaki, Heesup Choi, Jihoon Kim, Jeongsoo Nam

  Case Studies in Construction Materials 19 2214-5095 2023/12 

  This study investigated the potential of waste glass beads (WGB), a recycled porous lightweight material derived from waste glass, to enhance long-term curing of moisture-saturated cementitious construction materials. The macroscopic properties and microstructure development of a cement composite material blended with two types of WGB––spherical (B) and crushed (CB)––were analyzed. The primary objective was to provide practical guidelines for optimizing WGB utilization as a moisture release medium and thus contribute to sustainable concrete production by exploring waste glass applications. This study demonstrated the potential of WGB for improving strength and void structure and could help enhance the long-term durability of cement composites. Valuable insights were gained regarding the surface roughness and specific surface areas alongside curing methods to maximize WGB's effectiveness. The key contributions are as follows: (1) varying effects on high-strength concrete (HSC) strength with increased WGB content and surface roughness and specific surface areas were analyzed; (2) a proportional relationship between closed pore volume and modulus affecting macroscopic properties was revealed; (3) insights into hydration product presence in the ITZ and its relationship with WGB moisture content were gained; and (4) notable improvements in indentation tests for specimens with WGB were achieved, indicating enhanced ITZ hydration and increased density within both ITZ and paste.
• Study of microstructural changes in blast-furnace cement hardened by repeated dry and wet curing at high temperatures

  Kaishi Kojima, Jihoon Kim, Ryoma Kitagaki, Yukio Hama

  Construction and Building Materials 403 0950-0618 2023/11 

  In ordinary hardened cement, the pore structure changes with microstructural changes due to repeated dry and wet cycles. However, the calcium-silicate-hydrate (C-S-H) produced in blended cement is different from that of ordinary cement because blast furnace slag and fly ash are used in blended cement. In this study, microstructural changes in ordinary cement and hardened blast-furnace cement, which have different compositions of C-S-H, due to repeated dry and wet cycles at high temperatures, were analyzed by solid-state nuclear magnetic resonance (NMR) for structural changes in the products, and by time domain NMR and mercury intrusion porosimetry for changes in moisture and pore structure in the hardened cement. As a result, it was confirmed that the degree of coarsening of capillary porosity in blast-furnace cement was lower than in ordinary cement due to drying and repeated dry-wet cycles. This is believed to be because the aluminum contained in the blast furnace slag of the blast-furnace cement, which is present in the interlayer, improves the resistance of the C-S-H layer to compaction, resulting in less change in the pore structure. This study is expected to contribute to fundamental research on hardened cement in the future.
• N-methyldiethanolamine (MDEA) as an effective CO2 absorbent for direct air capture (DAC) in cement-based materials

  Kirushnapillai Kopitha, Yogarajah Elakneswaran, Ryoma Kitagaki, Ryosuke Saito, Masato Tsujino, Akira Nishida, Hisanori Senboku, Naoki Hiroyoshi

  Chemical Engineering Journal 475 146067 - 146067 1385-8947 2023/11 

  The escalating release of CO2 into the atmosphere has turned the matter of global warming into a pressing issue. Therefore, direct air capture (DAC - capturing CO2 from the environment) using buildings and infrastructure made of cement-based materials as “synthetic trees” could be an effective approach, given the growing urbanization trend. This study proposed a new technique to use N-methyldiethanolamine (MDEA) in cement-based materials to sequestrate CO2 from the environment. It has significant potential and flexibility compared to existing CO2 capture technologies, particularly given the limitations of CO2 mineralization in cement-based materials with slow kinetics. Furthermore, this study examined the resulting microstructural changes and reaction mechanisms of each hydrated phase, such as Ca(OH)2, calcium-silicate-hydrate (C-S-H), and hydrated cement, due to the addition of MDEA after carbonation. The study also investigated the effect of different percentages of amine on the carbonation of Ca(OH)2 under accelerated conditions, followed by the natural carbonation of cement paste coarse particles. The results showed that a 10% MDEA of water volume is optimal for CO2 capture in cement-based materials. Beyond this percentage, MDEA loss on the surface of solid particles was observed by thermogravimetric analysis (TGA). The study also examined the changes in microstructure, chemical environment, pH, and calcite formation in the cement paste samples with one side exposed to accelerated carbonation. MDEA increased calcite formation by 1.5–2 times compared to the samples that did not contain MDEA. Additionally, aragonite and calcite were formed when MDEA was present, whereas the samples without MDEA only formed calcite.
• Network Degradation Assessed by Evolved Gas Analysis–Mass Spectrometry Combined with Principal Component Analysis (EGA–MS–PCA): A Case of Thermo-Oxidized Epoxy/Amine Network

  Takato Ishida, Ryoma Kitagaki, Yogarajah Elakneswaran, Junji Mizukado, Hideyuki Shinzawa, Hiroaki Sato, Hideaki Hagihara, Ryota Watanabe

  Macromolecules 56 (3) 883 - 891 0024-9297 2023/01/18 

  To study the degradation of thermosetting polymers, we apply a novel method to simultaneously study the chemical structural changes and network topology: evolved gas analysis-mass spectrometry combined with principal component analysis (EGA-MS-PCA). This technique was applied to thermo-oxidative aging of an epoxy/amine network. The signals of various pyrolyzates remain overlapped in the complicated EGA-MS profiles. The key fragments of thermally evolved gases derived from the components of the network are effectively selected by PCA from the complicated EGA-MS profiles. EGA-MS-PCA provides information on the network structure: (i) the oxidized fraction of cross-links (i.e., chemically damaged cross-links), (ii) the relative quantification of unbonded chains, and (iii) the formation of dangling chains. The proposed technique can simultaneously characterize chemical degradation and network structural properties. This characterization technique can be utilized as a generally applicable tool for determining the structural durability of thermosetting polymers.
• Effect of Carbonation on Microstructure of Cement Pastes with Different Water-to-Cement Ratios

  K. Kopitha, S. Krishnya, Y. Elakneswaran, R. Kitagaki, Y. Yoda, M. Tsujino, A. Nishida

  Lecture Notes in Civil Engineering 362 LNCE 149 - 159 2366-2557 2023 

  The durability of the structures is the main concern in the field of engineering. Reinforcement corrosion is the most common cause of concrete structural deterioration. Corrosion of reinforcement results primarily from chloride ingress and carbonation. Cementitious materials are prone to carbonation as carbon dioxide is present everywhere in the atmosphere. For the durability prediction of cement-based materials, it is crucial to know the effect of carbonation on the microstructure of the cement matrix. This study examines how carbonation affects the microstructure of cement paste made up of Ordinary Portland Cement (OPC) with water-to-cement ratios (w/c) of 0.3, 0.4, and 0.5 with the help of the experiments and the newly developed model predicting the hydration products and porosity of the cement paste during the CO2 gas diffusion. As part of this study, phenolphthalein was used to determine the carbonation depth. In addition to identifying the hydrated and carbonated products using X-Ray Diffraction (XRD) and Thermal Gravimetric Analysis (TGA), changes in microstructure were detected through Scanning Electron Microscope (SEM). Furthermore, the microstructures of cement paste samples that have been exposed to 5% carbon dioxide concentration for four months were compared. Carbonation products consist predominantly of calcite type polymorph of calcium carbonate, as revealed by XRD. Portlandite and C-S-H get carbonated simultaneously and the carbonation reaction increases with the increasing w/c in accordance with XRD and TGA results. Eventually, the experimental results of calcite and portlandite were compared with the predicted results from a newly developed COMSOL-IPHREEQC interface, and a better prediction of the numerical model was observed.
• Proposing a Finite Element-based Multi-stage Model to Predict the Mechanical Properties of Cement Paste

  Mylvaganam Nithurshan, Siventhirarajah Krishnya, Yuya Yoda, Ryoma Kitagaki, Yogarajah Elakneswaran

  NanoWorld Journal 9 (Special Issue 2) 62 - 68 2023 

  In recent years, cementitious materials and fibers have become widespread in concrete mixtures to enhance the mechanical and durability properties of engineering structures. However, incorporating such materials increases construction costs and requires extensive experimental trials to determine the optimal dos-age. Consequently, researchers have conducted studies to predict cement-based materials’ mechanical properties using various techniques to avoid costly and labor-intensive experiments. Due to computer programming and hardware advancements, microstructure-based computational modelling techniques have garnered researchers’ attention. Hence, this study aims to propose a multi-stage model that predicts the mechanical properties of cement paste using unique input parameters, such as the chemical properties of cement and curing conditions, by integrating the hydration process and microstructure development. In the initial stage (Stage 0), the volume fraction of hydration products is predicted considering the formation of calcium silicate hydrates (C-S-H) in two densities. After-wards, a representative volume element (RVE) for cement paste is developed in MATLAB based on the previous stage’s results (Stage 0). In the next stage, the RVE’s geometry is transferred to COMSOL Multi-physics via the Live Link™ tool for numerical analysis, where intrinsic mechanical properties are computed and verified with two independent experimental data sets. The verification showed that the proposed multi-stage model accurately predicts the compressive strength and Young’s modulus of cement paste with time. Therefore, this modelling approach can be extended to predict the material properties of mortar and concrete through upscaling.
• Error Factors in Quantifying Inorganic Carbonate CO2 in Concrete Materials

  Haruka Takahashi, Ippei Maruyama, Takahiro Ohkubo, Ryoma Kitagaki, Yuya Suda, Atsushi Teramoto, Kazuko Haga, Takahiro Nagase

  Journal of Advanced Concrete Technology 21 (10) 789 - 802 1346-8014 2023 

  In this study, CO2 quantification was performed on various concrete binder and aggregates by back titration, thermogravimetric method, and combustion-infrared absorption method, and their mutual consistency and error factors due to material characteristics were investigated. The back titration measures CO2 directly and is considered the suitable method for both materials, although the effect of sulfide was a concern. On the other hand, the TGA method was revealed to have the possibility of underestimating or overestimating the CO2 determination because the oxidation of sulfides in blast furnace slag, combustion of unburned carbon in fly ash, and dehydration of clay minerals in aggregate overlapping with the temperature range of calcination of calcium carbonate. In the combustion-infrared absorption method, elemental or organic carbon encapsulated in aggregate particles may underestimate or overestimate the CO2 content. In blended cement, sulfur compounds may interfere with the infrared absorption of CO2 and overestimate the amount of CO2. Based on these results, back titration was considered the most suitable method for determining CO2 for concrete materials. It is essential to understand the characteristics of each sample contained and select appropriate methods for CO2 quantification of concrete materials and concrete.
• Numerical Simulation of Chloride Ion Ingression in Mortar Incorporating the Effect of ITZ Using an Integrated COMSOL-IPHREEQC Framework

  Siventhirarajah Krishnya, Yogarajah Elakneswaran, Yuya Yoda, Ryoma Kitagaki

  RILEM Bookseries 43 686 - 696 2211-0844 2023 

  The prediction of chloride ingression in cement-based material has gained a great deal of interest among researchers as it causes long-term structural damage in buildings by chloride-induced reinforcement corrosion. The Cl− diffusion in mortar is influenced by internal factors including pore-structure and hydrates which are determined by clinker properties, mixture recipe, and curing conditions and exposure conditions. The Cl− penetration in mortar leads to the modification of the microstructure and pore-solution due to the disequilibrium of the hydrates-pore solution system. Considering the complexity of the process by incorporating all aforementioned factors and interaction of Cl− with hydrates, a new model is herein proposed for predicting the microstructure of the mortar during the Cl− diffusion. In this work, the microstructure of mortar is considered as a three-phase material: aggregates, interfacial transition zone (ITZ) and bulk paste, and ITZ is realistically considered as high W/C paste compared to the initial W/C. The developed COMSOL-IPHREEQC model involves hydration model for calculating the dissolution of clinker in bulk paste and ITZ, thermodynamic model including the surface complexation model to predict the hydrates and the Cl− adsorption by hydrates, homogenization approach to compute the average hydrates, porosity, pore solution composition and diffusion parameters of the mortar and COMSOL Multiphysics to perform the transportation calculation. The predicted results are validated with experimental results available in the literatures to verify the reliability of the proposed model. The effect of ITZ on the penetration of Cl− is also assessed in this work.
• Analytic Methods of Foamed Plastic Insulation Deteriorated by Moisture

  Yoobin Leem, Sizuka Kojima, Ryoma Kitagaki

  Macromolecular Symposia 405 (1) 1022-1360 2022/10 

  Foamed plastic insulations installed into buildings are now expected to be long-lasting materials. However, in recent years, it has been reported that foamed plastic insulations installed in high-humid environments, such as under waterproof sheets on a rooftop, absorb moisture, and subsequently increase thermal conductivity. This paper studies both moisture absorption and changes in physical properties of foamed plastic insulations after exposure to high humidity and discusses the moisture-induced deterioration based on the results of several experiments.
• Accelerated Aging Test Modeling for Polycarbonate: Effects of Light Source

  Takato Ishida, Ryoma Kitagaki

  MACROMOLECULAR SYMPOSIA 405 (1) 1022-1360 2022/10 

  This work addresses to propose a model to reproduce accelerated aging results for polycarbonate. Four accelerated aging conditions are studied, including several light sources. In this study, aging behaviors are monitored by the yellowing index. Obtained simulations are well-tracked the aging data for four accelerated aging conditions. Besides, the features of accelerating environments by a phase plane plot are challenged to visualize.
• In-situ infrared cure monitoring combined with two-trace two-dimensional (2T2D) correlation analysis to elucidate the matrix–filler interaction of nanocomposites: Case of thermosetting urethane/silica nanospheres

  Takato Ishida, Ryota Watanabe, Hideyuki Shinzawa, Junji Mizukado, Hideaki Hagihara, Ryoma Kitagaki, Yogarajah Elakneswaran

  Polymer Testing 112 107587 - 107587 0142-9418 2022/04 

  A novel technique, in-situ infrared (IR) cure monitoring coupled with two-trace two-dimensional (2T2D) correlation analysis, is developed to probe the property-enhancement mechanism of a newly developed thermosetting nanocomposite comprising an acrylic-urethane network (AUN) and silica nanospheres (SNS). The IR spectra were collected in real-time during the curing process at 100 °C. We employ the 2T2D correlation analysis to identify the spectral variations of the interfacial interaction. The curing reaction initially proceeds throughout the sample solution. After the network percolation, the unreacted sites react near the SNS surface and yield additional hydrogen-bonded C[dbnd]O groups that interact with the surface silanol groups. The matrix–filler interactions play a key role in enhancing the hardness and thermal stability of the AUN/SNS nanocomposites by restricting the mobility of the polymer molecules. The proposed technique provides sequential mechanisms in the curing process and a picture of the interfacial interaction for the thermosetting nanocomposite system.
• Thermal aging of acrylic-urethane network: Kinetic modeling and end-of-life criteria combined with mechanical properties

  Takato Ishida, Emmanuel Richaud, Matthieu Gervais, Alain Gaudy, Ryoma Kitagaki, Hideaki Hagihara, Yogarajah Elakneswaran

  PROGRESS IN ORGANIC COATINGS 163 0300-9440 2022/02 

  This study addresses the multiscale analysis of acrylic urethane networks (AUN). To establish the kinetic model for predicting AUN oxidation, this study considered the pure thermal oxidation of AUN at 160, 180, and 200 degrees C. Chemical changes were monitored using infrared spectroscopy. These indicated the presence of an imide, presumably generated from the oxidation of CH2 at the alpha-position of nitrogen. On the macromolecular and macroscopic scales, oxidation was shown to induce predominant crosslinking, leading to a drop in toughness (i. e., embrittlement). The novel kinetic model of AUN thermal aging was developed from a mechanistic scheme previously established for polyamide 11, by adding some extra paths of thermolytic alkyl radical formation, oxidative N-H bonds decomposition and coupling of aminyl radicals.
• Role of moisture in photo-ageing -macromolecular architecture evolution of acrylic-urethane network

  Takato Ishida, Ryoma Kitagaki, Hideaki Hagihara, Yogarajah Elakneswaran

  Polymer Testing 96 107123 - 107123 0142-9418 2021/04 

  In this work, the role of moisture in photo-ageing was discussed for the case of an acrylic-urethane network. Ageing behaviours were characterised by Fourier transform infra-red spectroscopy, positron annihilation lifetime spectroscopy, sol-gel analysis, and differential scanning calorimetry. Two common features between dry and wet photo-ageing, namely, decrease in the mean free volume and increase in the glass transition temperature were observed as photo-oxidation progressed. The characteristics of the final internal structure of the wet photo-aged sample differed from those of the dry photo-aged sample. Although the dry photo-aged samples suggested network densification due to extensive crosslinking formation, wet photo-ageing led to an inhomogeneous structure wherein the average molar mass between crosslinks (at a scale of several nanometres) increased and some domains crosslinked at the sub-nanoscale. Considering the physical (plasticisation) and chemical (hydrolysis) effects induced by water, a possible mechanism for the evolution of the macromolecular architecture was proposed for photo-ageing in dry and wet environments.
• Mathematical Modeling of Outdoor Natural Weathering of Polycarbonate: Regional Characteristics of Degradation Behaviors

  Takato Ishida, Ryoma Kitagaki

  Polymers 13 (5) 820 - 820 2021/03 

  Many natural exposure sites have been developed to ensure the reliability of materials intended for outdoor use. However, the effects of local climate on aging have not been completely understood. This study aimed to elucidate the regional characteristics of natural aging. Non-stabilized and stabilized polycarbonates were monitored in terms of their appearance (yellowing and loss of gloss) during natural weathering at five exposure sites (Tokyo, Kagoshima, Okinawa, Florida, and Arizona) in conjunction with climate fluctuation for up to 24 months. Three approaches were employed to characterize the natural aging behaviors: (i) modeling the rate function of degradation, (ii) evaluating the contribution ratio of individual degradational factors, and (iii) estimating the “synchronicity” by cross-correlation analysis with the climate dataset. The aging rates were the highest in Arizona and lowest in Kagoshima among the five exposure sites. First, prediction curves were constructed from the degradation rate function (variables: UV irradiation, temperature, and humidity), and these curves were found to agree well with the measured aging behaviors. Second, the exposure data in Arizona demonstrated strong temperature dependence, while those in Okinawa and Florida had stronger dependence on UV irradiation compared to other sites. Lastly, the synchronicity between UV irradiation and temperature was the highest in Arizona and lowest in Kagoshima, which can explain the significantly faster deterioration in Arizona and the slow deterioration in Kagoshima.
• ANALYTICAL METHODS OF FOAMED PLASTIC INSULATION DETERIORATED BY WATER

  LEEM Yoobin, KITAGAKI Ryoma

  AIJ Journal of Technology and Design 一般社団法人 日本建築学会 27 (65) 93 - 98 1341-9463 2021 

  Foamed plastic insulations installed into buildings are now expected to be long-lasting materials. However, in recent years, it has been reported that the foamed plastic insulation installed in the high-humid environment, such as under waterproof sheets on a rooftop, absorbs moisture and subsequently increases the thermal conductivity. The mechanism of moisture absorption is not sufficiently clear, and the test method for thermal conductivity of building insulating materials does not consider the influence of humidity. This study observed both moisture absorption and changes of physical properties of foamed plastic insulations after exposed at high humidity and discussed the moisture-induced deterioration.

• Proposal of demolished concrete recycling system based on performance evaluation of inorganic building materials manufactured from waste concrete powder

  Dayoung Oh, Takafumi Noguchi, Ryoma Kitagaki, Hyeonggil Choi

  RENEWABLE & SUSTAINABLE ENERGY REVIEWS 135 1364-0321 2021/01 

  The rapid industrial development and global population growth of the past century have resulted in an exponential increase of resource consumption and thus caused elevated CO2 emissions that, in turn, are held responsible for global warming and associated environmental problems that require urgent solutions. Specifically, increase of cement production causes CO2 pollution and generates a significant amount of concrete waste. Waste concrete, the major component of construction waste, can be efficiently recycled and is mainly used as a roadbed or backfill material. However, as no further resource recycling is expected for waste concrete, more efficient and productive recycling systems are sought after. Herein, waste concrete powder is used to produce added-value inorganic building materials, namely recycled cement and solidification. The characteristics of recycled cement (manufactured through calcination) are evaluated in terms of free lime content, mineral composition, density, color, flow test and strength, and the performance of recycled cement is found to be identical to that of ordinary Portland cement. X-ray diffraction and compressive strength analyses of the solidification manufactured through hydrothermal synthesis show that blocks of the desired strengths can be produced by adjusting the degree of consolidation and curing conditions. Based on these results, this study proposes a concrete waste recycling system to reduce the amount of construction waste and prevent resource depletion.
• Behavior of hydrates in cement paste reacted with silicate-based impregnant

  Jihoon Kim, Ryoma Kitagaki

  CEMENT & CONCRETE COMPOSITES 114 0958-9465 2020/11 

  In order to improve the durability of concrete structures, silicate-based impregnant have been used, but the chemical interaction mechanism is not clear. Silicate-based impregnant react with calcium hydroxide, which is formed during the process of cement hydration, and form compounds similar to a calcium silicate hydrate (C-S-H). This paper performs reaction experiments by Ca/Si ratio, and solid state nuclear magnetic resonance (NMR) and X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy are conducted for observing chemical changes of cement paste with silicate-based impregnants. Based on the results of XRD, reduction of monosulfate phase was observed as well as the formation of C-S-H (tober-morite-like phase). Si-29 and Al-27 NMR spectra also correspond with the XRD results. Further, possibility of both Al/Si substitution and formation of a structure close to C-(A)-S-H (C-S-H containing Al) were observed. Therefore, silicate-based impregnant formed not only new C-S-H reacting with calcium hydroxide, but also influenced other hydrates.
• Chemical properties and mass transfer resistance of mortar surface modified with silicate-based surface impregnant

  Jihoon Kim, Ryoma Kitagaki

  CONSTRUCTION AND BUILDING MATERIALS 262 0950-0618 2020/11 

  Silicate-based surface impregnation is used to improve the surface durability of concrete structures. This study employs various analysis tools to understand the relationship between cement-hydrate formation behavior and durability development upon the application of a silicate-based surface impregnant. Through simple surface immersion experiments, we evaluate the chemical properties and mass transfer resistance of modified surfaces and observe changes in carbonation related to these properties. We found that calcium silicate hydrate at the surface is produced due to the application of the silicate-based surface impregnant. However, we confirm that the penetration of carbon and carbonation of the surface layer are promoted due to changes in both the hydrate and physical properties of the modified surface. In addition, the chemical and physical changes in the surface layer due to the modification reduce the elastic modulus of the surface layer and have no effect on improving mass transfer resistance. These results could present a significant contribution to developments in concrete applications and allied fields. (C) 2020 Elsevier Ltd. All rights reserved.
• Pore Filling Effect of Forced Carbonation Reactions Using Carbon Dioxide Nanobubbles

  Jihoon Kim, Ryoma Kitagaki, Heesup Choi

  Materials 13 (19) 4343 - 4343 2020/09/29 

  Various methods for repairing and modifying concrete surfaces have been proposed and applied to improve the durability of existing concrete structures. Surface modification through forced carbonation is a method of densification that forms calcium carbonate in the pores on the surface of concrete to improve its durability. In this study, to evaluate the applicability of this surface modification method to existing buildings, a series of experiments was conducted in which mortar specimens were repeatedly immersed in a carbon dioxide nanobubble aqueous solution. By evaluating the weight change and absorption rate, it was determined that the higher the water/cement ratio of the mortar specimen, the higher the pore filling effect owing to immersion in the carbon dioxide nanobubble aqueous solution. In addition, the effect of clogged pores generated by the precipitation of calcium carbonate was confirmed, and it was found that the higher the water/cement ratio of the mortar specimen, the higher the pore filling effect due to clogging. We believe that our findings contribute to the development of research and construction practices associated with concrete repair and restoration.
• A study of molecular architectural dynamics of crosslinked urethane during photo-aging by two-dimensional infrared correlation spectroscopy

  Takato Ishida, Ryoma Kitagaki, Ryota Watanabe, Hideaki Hagihara, Yogarajah Elakneswaran, Hideyuki Shinzawa

  POLYMER DEGRADATION AND STABILITY 179 0141-3910 2020/09 

  The molecular architecture changes of crosslinked urethane during photo-oxidation was investigated by Fourier transform infrared spectroscopy (FTIR) in combination with two-dimensional (2D) correlation analysis. The 2D correlation FTIR spectroscopy provided insight into molecular architectural dynamics during photo-aging, where the sequential order of peak changes was determined upon perturbation with photo-aging. Photo-oxidation was monitored from the decrease in the peak intensity at 1537 cm(-1) (attributed to the urethane group) and the generation of the hydrogen bonded C=O groups at 1698 cm(-1) immediately after urethane decomposition. Several notable peaks appeared (1712,1650, and 1750 cm(-1)) in the later stages, which were attributed to the free photo-oxidative product. In summary, photo oxidation involved a cleavage of urethane crosslink and generation of end groups that formed hydrogen bonds with surrounding hydrogen bonding sites. Further degradation of the free photo products was observed likely because of the small number of accessible hydrogen bonding sites due to the increasing heterogeneity of the internal structure. (C) 2020 Elsevier Ltd. All rights reserved.
• Agent-based modeling of super-long-term maintenance processes for RC building groups: Stochastic study of risks of building groups by super-long-term combined deterioration Part 2

  Tetsushi Miyoshi, Ryoma Kitagaki, Takafumi Noguchi

  JAPAN ARCHITECTURAL REVIEW 3 (3) 307 - 317 2475-8876 2020/07 

  In this paper, we analyze the corrosion of reinforcements as indices of processes of the super-long-term combined deterioration of reinforced concrete building groups with finishing materials, pre-induced cracks, and maintenance. Specifically, we systemize specifications for finishing materials by permeability, deterioration mechanisms, and demeanor after repairs, and adopt agent-based modeling for decision-making of specifications for structures, finishing materials, and repair methods whose characteristics are based on generic products. We calculate the corrosion of reinforcements in general parts by Yonezawa's method and in cracks by the corrosion speed of bare steel, and assume minimum corrosion amounts required to initiate new cracks by Morinaga's method in consideration of corrosion amounts to fill up voids around reinforcements. We analyze the deterioration processes of building groups by using three scenarios with several histories of preferences of building owners based on ISO 19208. It is confirmed that the averages of acceleration-period arrival rates in the group vary in line with the characteristics of each scenario and are lower than the repair limits for each preference and half of the 3% upper-confidence limits. Although this method is embryonic, we quantitatively and theoretically demonstrate the super-long-term combined deterioration processes of the building group.
• Influences of rehydration conditions on the mechanical and atomic structural recovery characteristics of Portland cement paste exposed to elevated temperatures

  Heongwon Suh, Hyeonseok Jee, Jihoon Kim, Ryoma Kitagaki, Shinobu Ohki, Seungmin Woo, Keunhong Jeong, Sungchul Bae

  CONSTRUCTION AND BUILDING MATERIALS 235 0950-0618 2020/02 

  This study investigates the effects of rehydration conditions (different hydration durations at 20 degrees C/60% relative humidity (RH) and in water) on the mechanical and atomic structural recovery of cement paste heated to temperatures of 200, 500, 800, and 1000 degrees C. Variations in the mass, bulk density, compressive strength, and surface morphology of the paste due to heating and rehydration were characterized. In addition, variations in the hydration products and the mean chain length (MCL) of calcium silicate hydrates (C-S-H) in the pastes due to heating and rehydration were analyzed using X-ray diffraction and Si-29 solid-state nuclear magnetic resonance spectroscopy (Si-29 NMR), respectively. The compressive strength of the cement paste heated up to 500 degrees C recovered much more when the paste was placed in water while hot and water-rehydrated for 24 h than when it was rehydrated at 20 degrees C/60% RH. This mechanical recovery could be induced by accelerated hydration, which results in the formation and enhanced silicate polymerization of C-S-H. Si-29 NMR analysis further indicated that the mechanical recovery of cement paste was correlated linearly with the increase in the MCL of C-S-H. In contrast, no mechanical recovery was observed in the cement pastes heated at 800 degrees C and 1000 degrees C after rehydration due to the decomposition of C-S-H. (C) 2019 Elsevier Ltd. All rights reserved.
• Morphology Changes and Fillers Migration in Urethane Composites during Thermal Degradation

  Atsuki Tanifuji, Takato Ishida, Ryoma Kitagaki

  Current Topics and Trends on Durability of Building Materials and Components - Proceedings of the 15th International Conference on Durability of Building Materials and Components, DBMC 2020 177 - 182 2020 

  Polyurethane composite coatings are frequently applied to strengthen the barrier properties of various construction materials such as wood, metal and concrete. The changes of color and glossiness of the composite coatings for building materials proceeds more slowly than that of polyurethane because of containing fillers and several types of additives. However, the most critical barrier properties have not been studied directly based on the difference from the degradation mechanism of polyurethane coatings. Additionally, the difference in thermal and UV degradation mechanisms of coatings is not clear in the existing studies dealing with conventional accelerated weathering tests and outdoor exposure tests. Therefore, the behavior of the filler contained in the coatings was observed using an oven to accelerate thermal degradation. The chemical analysis of the coating surface by XPS and the analysis of the images and elemental mappings by SEM-EDS were carried out, and the mechanism of degradation progress was investigated. In addition, the temperature dependency of the degradation was studied in changing the heating temperature. It was suggested that polymer and fillers interact in promoting mass transfer at the same time as the thermal degradation reaction consequently.
• Intrinsic Differences on the Photodegradation Mechanisms between Pigmented and Non-Pigmented Coatings Determined by Multi-Scale Analysis

  T. Ishida, R. Kitagaki, H. Hagihara, Y. Elakneswaran

  XV International Conference on Durability of Building Materials and Components. eBook of Proceedings 1023 - 1030 2020 

  Multi-scale analysis of photodegradation are conducted for pigmented coating containing acrylic urethane + TiO2pigment and for non-pigmented coating containing only acrylic urethane. We discuss the intrinsic differences in the photodegradation mechanism between the pigmented and nonpigmented coatings and the effect of the interface between the pigment and the binder. Photo-aging tests are conducted using artificial ultraviolet (UV) irradiation under conditions of 60 °C and dry atmosphere. The results of Fourier transform infrared spectroscopy (FTIR), solvent swelling experiments, ultrasonic measurements of elastic moduli, and colourimetry used for material characterisation before and after photo-aging. Although the behaviour of E and the carbonyl index (CI) show common trends for both samples, the overall trends of yellowness index (YI) and swelling degree (Q) differ significantly between the pigmented and non-pigmented samples. The results reveal that changes in macroscopic properties may not necessarily correspond with the CI behaviour and that characteristic interfacial effects exist between the pigment and the binder. The onsets of coating erosion and chalking are observed in the pigmented coating as surface topological changes. The different behaviour of YI and Q between the sample types can be attributed to the interfacial effect at pigment/binder interface based on the photocatalytic effect from TiO2pigment.
• The Repairing Effects of Lithium Silicate Based Material to the Surface of Hardened Concrete

  Nguyen Xuan Tung, Ryoma Kitagaki, Yoshiro Yamakita

  Innovation for Sustainable Infrastructure 54 477 - 482 2366-2557 2020 

  There are many damage types on concrete structures. Crack and spalling on concrete structures are the most popular damages. The causes of these damage are variable but mostly originate from the corrosion of reinforcement that cause by the salty, humidity air, carbonation or ion chloride penetration via appeared cracks on the concrete surfaces that lead to the expansion of the reinforcement cross section. It is necessary to protect the surface area of concrete in order to prevent concrete structures from being deteriorated. The method of applying a surface protective agent has been developed as one of the methods to protect concrete. In this study, the repairing effects of lithium silicate based surface protective agent in high permeability and chloride resistance will be evaluate. As a result, reduction of coefficient of water permeability and effective diffusion coefficient of chloride ion of hardened concrete that had been repaired by the lithium silicate based surface protective agent were confirmed.
• Free Volume Hole Size Evaluation of Polymeric Coatings and Its Degradation Analysis Using Positron Annihilation Lifetime Spectroscopy

  石田崇人, 北垣亮馬, 萩原英昭

  塗装工学 日本塗装技術協会 55 (12) 488 - 495 0285-3787 2020
• Challenges in prediction of significant structural changes during photochemical "degelation" of acrylic-urethane network

  Takato Ishida, Ryoma Kitagaki, Hideaki Hagihara, Yogarajah Elakneswaran

  POLYMER 186 0032-3861 2020/01 

  Structural changes induced by photo-aging have significant influence on material properties. The prediction of the period prior to the onset of significant morphological changes is useful in determining material service lifetime. We assume "degelation" to be the starting point of significant morphological change during photo-aging. Herein, we demonstrated the relationship between such time and the "degelation" phenomenon for an acrylic-urethane network polymer. We also derived a "degelation" theory considering network imperfections, e. g. dangling chains and looping chains. This provides a more accurate representation of reactive curing polymers widely used in industries. Lastly, we estimated the "imperfection degree" by comparing the number of elastically active chains obtained from a swelling experiment with the theoretically derived number. In this system, samples may originally possess approximately 10% network imperfection and it influences on the degelation period in aging process. Our study may potentially contribute to a more accurate prediction of the onset of significant structural change.
• A new concrete frost resistance evaluating method considering moisture content increase under outdoor exposure

  Dequn Ma, Osamu Senbu, Ryoma Kitagaki

  Journal of Asian Concrete Federation 5 (2) 20 - 26 2019/12
• モデル建物の30 年屋外暴露試験に基づく仕上材の劣化状況と中性化抑制効果

  米谷怜, 千歩修, 北垣亮馬, 根本かおり

  コンクリート年次論文集 1137 2424-0281 2019/07
• The effect of lowest temperature in the accelerated freeze-thaw test on concrete frost deterioration

  Ma D, Kitagaki R, Senbu O

  Proceedings of the Japan Concrete Institute 1140 2019/07
• Temperature dependence of structural alteration by ultraviolet irradiation in acrylic-urethane coatings studied by positron annihilation spectroscopy and solvent swelling behavior

  Takato Ishida, Ryoma Kitagaki, Shogo Yamane, Hideaki Hagihara

  POLYMER DEGRADATION AND STABILITY 162 85 - 93 0141-3910 2019/04 

  The structural alteration of acrylic-urethane coatings, induced by photo-aging, and its temperature dependence, was investigated using positron annihilation lifetime spectroscopy and solvent swelling experiments. The results revealed a slight structural alteration due to photo-aging at 20 degrees C. On the other hand, a significant structural alteration occurred due to photo-aging at 60 degrees C, which resulted in a decrease in the pore size and total pore volume. To study the mechanism of such morphological changes, infrared spectra were measured before and after aging the samples. The results revealed the breakage of the urethane crosslink points and the generation of various photo-products including peroxide species that can form hydrogen bonds. This indicates the foundation of new physical and chemical crosslinks (different from the initial urethane linkage). Based on the chemical modifications, probable mechanisms of the internal morphological changes are proposed. Moreover, the changes are mainly due to an enhancement in the chain-mobility, due to the destruction of the polymer network and an increase in the inter-chain interactions. The results of this study reveal that significant internal structural alterations can occur after sufficient damage to the initial network structure. The proposed explanation is reasonable in relation to the temperature dependence of photo-induced structural alterations, and with respect to the molecular mobility and reaction ratio of photo-oxidation. (C) 2019 Elsevier Ltd. All rights reserved.
• Risk analysis of super long-term maintenance process of RC building group based on damage of the virtual earthquake

  Tetsushi Miyoshi, Ryoma Kitagaki, Takafumi Noguchi

  Journal of Structural and Construction Engineering 84 (755) 1 - 8 1340-4202 2019/01 

  Corrosion process of reinforcements of RC building group based on super long-term combined deterioration is integrated into the seismic assessment and changes of human and building damage in virtual earthquakes causing one fatality at the new condition are analyzed. The number of fatalities in the group with maintenance and deterioration by the scenario oriented for Economy does not change for 200 years, but maintenance could not eradicate the increase of severely injured people and completely collapsed buildings. Risk of buildings in super long-term should be reviewed for the group unit stochastically because of the uncertainty of seismic performance.
• Real Estate Evaluation on Thermal Diffusivity with IoT Sensors.

  Yuan Lin, Shimpei Nomura, Yoichi Ikemoto, Yuki Obuchi, Xueting Wang, Toshihiko Yamasaki, Ryoma Kitagaki, Satoshi Toriumi, Mikihisa Hayashi, Ai Sakai, Nobuhito Haga

  IEEE 8th Global Conference on Consumer Electronics(GCCE) 447 - 448 2019 

  We have been developing IoT sensor systems for real estate evaluation. In this paper we propose a method to measure thermal diffusivity to evaluate real estate properties. With our IoT sensor system, we have measured multiple environmental data in 109 apartments across Japan. It has been revealed that the thermal diffusivity performance can vary depending on quality, material, and age of the apartments.
• The repairing effects of lithium silicate based material to the surface of hardened concrete

  Nguyen Xuan Tung, Ryoma Kitagaki, Yoshiro Yamakita

  Congrès International de Géotechnique - Ouvrages – Structures 2019
• An experimental study on the bond splitting strength of reinforced concrete beams with a mixture of low quality recycled aggregate and normal aggregate

  Noritaka Morohashi, Yuuki Hino, Ryoma Kitagaki, Atsuhisa Ogawa

  Journal of Structural and Construction Engineering 83 (751) 1319 - 1329 1340-4202 2018/09 

  The Architectural Institute of Japan (AIJ) published a Recommendation for Mix Design, Production and Construction Practice of Concrete with Recycled Concrete Aggregate. Based on the Recommendation, recycled aggregate concrete using a mixture of low quality recycled aggregate was applied to reinforced concrete beams. As a result, a series of beam specimens using a mixture of low quality recycled fine aggregate and normal fine aggregate that included recycled coarse aggregate at a low substitution rate showed a tendency of having less drying shrinkage cracks. No significant differences of the bond splitting strength existed between normal concrete and that recycled aggregate concrete.
• AGENT BASE MODELLING ABOUT SUPER LONG-TERM MAINTENANCE PROCESS FOR RC BUILDING GROUP:Stochastic study about risk of building group by super long-term combined deterioration Part 2

  MIYOSHI Tetsushi, KITAGAKI Ryoma, NOGUCHI Takafumi

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 83 (749) 953 - 961 1340-4202 2018/07 

  In this paper, cracks of concrete proceeded from corrosion of reinforcements are analyzed as indices of super long-term combined deterioration processes of RC building groups with finishing materials, pre-induced cracks and maintenance.
  Specifications for finishing materials are systemized by permeability, deterioration mechanism, deterioration speed and demeanor after repairs and Agent Base Modelling is adopted about decision-making for building specifications.
  It is clarified that the average acceleration period arrival rates vary in line with the characteristics of each scenario and are less than repair limits for the group and are one second of 3％ upper confidence limits.
• Proceedings of the 2018 ACM Workshop on Multimedia for Real Estate Tech, RETech@ICMR 2018, Yokohama, Japan, June 11, 2018

  RETech@ICMR 2018
• マンションの修繕積立金の資金繰り逼迫性の空間分布構造に関する基礎的研究

  北垣亮馬, 石田崇人, 長根乃愛, 片桐由希子

  日本建築学会大会学術講演会，オーガナイズドセッションG 空間社会形成への取組みと課題 2018 1883-9363 2018
• Temperature Dependency of Photodegradation Mechanisms by Using Temperature and Humidify Controlled UV Irradiation Equipment : Physical and Chemical Properties Change on Urethane Coatings for Building Material

  石田崇人, 北垣亮馬

  塗装工学 日本塗装技術協会 53 (4) 114 - 121 0285-3787 2018
• Temperature Dependent Photodegradation on Urethane Coatings for Building Materials in a Low Relative Humidity Environment

  Takato Ishida, Ryoma Kitagaki

  KOBUNSHI RONBUNSHU 公益社団法人 高分子学会 75 (3) 265 - 274 0386-2186 2018 

  Organic coatings for building exterior walls are attracting a lot of attention because of the requirement for long-term usage of buildings and other constructs. Polyurethane (PU) has been commonly applied on building exterior walls. UV irradiation tests were carried out in a custom made apparatus at low relative humidity (< 10%) and several surface temperatures. For irradiated samples, IR and Raman spectra were measured to study change of chemical structure. Irradiated samples did not yellow on exposure and we could not observe an increase of double bond groups (C=C, C=0). In terms of temperature dependent degradation reactions, the Photo-Fries reaction seemingly does not depend on temperature, whereas Norrish type reactions are promoted by higher temperature. Moreover, we investigated the relationship between aggregate-state and change of elastic modulus, in early stages, it shows a better correlation between them than in later stages.
• Measuring the Temperature and Humidity Dependence of Gas Diffusivity in Building Coatings by Using a Using Thermal Desorption System

  Ryoma Kitagaki

  KOBUNSHI RONBUNSHU 公益社団法人 高分子学会 75 (4) 347 - 357 0386-2186 2018 

  It becomes increasingly important to estimate the barrier performance of coatings used for buildings in proportion to the increasing demand of building longevity in recent years. However, the barrier performance of coatings for building use which is attached and mixed with various base materials is difficult to estimate by conventional methodologies. Therefore, a thermal desorption system (TDS) for estimating gas coefficients of permeability, solubility and diffusivity of coatings for building use has been applied and it's validity has been confirmed. As a result, the TDS method has been confirmed to be almost compatible with the conventional differential-pressure method, and additionally, it has been confirmed that the gas transfer in coatings for building use is dependent of temperature, humidity and interaction among the present gas species, as in conventional polymer films. The free-volume in coatings for building use can be estimated by the obtained data.
• 歴史文化資源のためのデータベースの構築と地域利活用を考慮した価値構造の自動評価手法に関する研究

  北垣亮馬, 林 憲吾, 谷川竜一, 鮎川 慧, 三村 豊, 村松 伸

  第40回情報･システム･利用･技術シンポジウム R21 2017/11
• マルチエージェント人工市場への行動経済学的手法の導入による建設資材の市場価格変動の再現に関する研究

  北垣亮馬, 三好徹志

  第40回情報･システム･利用･技術シンポジウム R02 2017/11
• 11046 マンションの修繕積立金の分布に関する基礎的研究

  木戸 聡, 石田 崇人, 北垣 亮馬

  情報システム技術 日本建築学会 2017 (2017) 91 - 92 1883-9363 2017/07/20
• 昇温脱離装置を用いたコンクリートの化学分析に関する基礎的研究

  工藤高弘, 北垣亮馬

  日本コンクリート工学会年次論文集 39 2424-0281 2017/07
• 各種表面含浸材で補修されたセメント硬化体表面の水蒸気拡散係数および組成変化に関する基礎的研究

  久永 真子, 北垣 亮馬, 金 志訓

  日本コンクリート工学会年次論文集 39 2424-0281 2017/07
• AGENT BASE MODELLING OF REBUILDING PROCESS OF BUILDING GROUP BY DOWNWARD OFT

  三好徹志, 北垣亮馬, 野口貴文

  社会技術研究論文集 社会技術研究会 14 146 - 155 1349-0184 2017/06
• 鉄筋コンクリートの超長期複合劣化過程の反応型非定常拡散方程式による解析的考察 超長期複合劣化による建築物群のリスクの確率論的考察 その1

  三好徹志, 北垣亮馬, 野口貴文

  日本建築学会構造系論文集 82 2017
• ケイ酸ナトリウムを補修材として用いたセメント硬化体の炭酸化特性に関する基礎的な研究

  金 志訓, 北垣亮馬

  日本コンクリート工学会年次論文集 39 (1) 2424-0281 2017
• Rapid Carbonation Method to Concrete Surface Using Micro/Nano Bubble

  KITAGAKI Ryoma

  Journal of the Japan Society for Precision Engineering 公益社団法人 精密工学会 83 (7) 647 - 650 0912-0289 2017
• ANALYTICAL STUDY ON SUPER LONG TERM COMBINED DETERIORATION PROCESS IN RC STRUCTURE BY TRANSIENT REACTION-DIFFUSION EQUATION:Stochastic study about risk of building group by super long term combined deterioration Part 1

  MIYOSHI Tetsushi, KITAGAKI Ryoma, NOGUCHI Takafumi

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 82 (735) 625 - 632 1340-4202 2017 

  In this study, combined deterioration mechanism in reinforced concrete with CO₂, flying salt, acid rain is reconstituted by transient reaction-diffusion equation and super long-term deterioration process is analyzed in RCP scenario.
  This method is confirmed to be consistent with research of the past about carbonation and to be suitable for complex hysteresis in RCP scenario.
  Simple formula for building group is also formed and reliability design method with mixture distribution of carbonation in several RCP scenarios is proposed. Probability of carbonation by mixture distribution increases in durable member with thick cover depth after 100 years.
• Volcano-related materials in concretes: a comprehensive review

  Gaochuang Cai, Takafumi Noguchi, Herve Degee, Jun Zhao, Ryoma Kitagaki

  ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 23 (8) 7220 - 7243 0944-1344 2016/04 

  Massive volcano-related materials (VRMs) erupted from volcanoes bring the impacts to natural environment and humanity health worldwide, which include generally volcanic ash (VA), volcanic pumice (VP), volcanic tuff (VT), etc. Considering the pozzolanic activities and mechanical characters of these materials, civil engineers propose to use them in low carbon/cement and environment-friendly concrete industries as supplementary cementitious materials (SCMs) or artificial/natural aggregates. The utilization of VRMs in concretes has attracted increasing and pressing attentions from research community. Through a literature review, this paper presents comprehensively the properties of VRMs and VRM concretes (VRMCs), including the physical and chemical properties of raw VRMs and VRMCs, and the fresh, microstructural and mechanical properties of VRMCs. Besides, considering environmental impacts and the development of long-term properties, the durability and stability properties of VRMCs also are summarized in this paper. The former focuses on the resistance properties of VRMCs when subjected to aggressive environmental impacts such as chloride, sulfate, seawater, and freezing-thawing. The latter mainly includes the fatigue, creep, heat-insulating, and expansion properties of VRMCs. This study will be helpful to promote the sustainability in concrete industries, protect natural environment, and reduce the impacts of volcano disaster. Based on this review, some main conclusions are discussed and important recommendations regarding future research on the application of VRMs in concrete industries are provided.
• Evaluation on the Mechanical Performance of Low-Quality Recycled Aggregate Through Interface Enhancement Between Cement Matrix and Coarse Aggregate by Surface Modification Technology

  Heesup Choi, Hyeonggil Choi, Myungkwan Lim, Masumi Inoue, Ryoma Kitagaki, Takafumi Noguchi

  INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS 10 (1) 87 - 97 1976-0485 2016/03 

  In this study, a quantitative review was performed on the mechanical performance, permeation resistance of concrete, and durability of surface-modified coarse aggregates (SMCA) produced using low-quality recycled coarse aggregates, the surface of which was modified using a fine inorganic powder. The shear bond strength was first measured experimentally and the interface between the SMCA and the cement matrix was observed with field-emission scanning electron microscopy. The results showed that a reinforcement of the interfacial transition zone (ITZ), a weak part of the concrete, by coating the surface of the original coarse aggregate with surface-modification material, can help suppress the occurrence of microcracks and improve the mechanical performance of the aggregate. Also, the use of low-quality recycled coarse aggregates, the surfaces of which were modified using inorganic materials, resulted in improved strength, permeability, and durability of concrete. These results are thought to be due to the enhanced adhesion between the recycled coarse aggregates and the cement matrix, which resulted from the improved ITZ in the interface between a coarse aggregate and the cement matrix.
• The Chemical Changes Of Cement Paste With Silicate-Based Surface Penetrants

  Jihoon Kim, Ryoma Kitagaki

  the 7th international conference of Asian concrete federation 2016
• PPMS による建築材料の熱伝導率測定と含水率依存性に関する基礎的研究

  長田美咲, 北垣亮馬

  日本熱物性学会シンポジウム B322 0911-1743 2016
• 母集団の多重共線性を考慮したヘドニック・アプローチによる集合住宅における中古・賃貸市場の価格形成因子の定量的評価に関する研究

  北垣亮馬, 米沢裕人

  国立情報学研究所，IDRユーザフォーラム 2016
• ケイ酸ナトリウムを補修材として用いたセメント硬化体の化学的変化に関する基礎的な研究

  金 志訓, 北垣 亮馬, 木戸 聡

  コンクリート工学年次論文集 日本コンクリート工学会 38 (1) 1911 - 1916 1347-7560 2016 

  コンクリート表面に新しい水和物を生成させ緻密化させる補修技術として利用される、ケイ酸ナトリウム表面含浸材の補修効果をセメント硬化体中のCa(OH)2量に基づき、投入する水ガラスの比率を変えて検討した。Ca2+と水ガラスから生成される新しいC-S-Hを含むセメント硬化体の化学的変化をXRD及びMAS NMRを用いて検討し、Ca/Si比が高い試験体がC-S-H及び元のC-S-Hにおいて、SiとAlの置換が起こっている可能性が示唆され、C-A-S-Hに近い構造が現れることを確認した。
• Risk evaluation for recycled aggregate according to deleterious impurity content considering deconstruction scenarios and production methods

  Takafumi Noguchi, Won-Jun Park, Ryoma Kitagaki

  RESOURCES CONSERVATION AND RECYCLING 104 405 - 416 0921-3449 2015/11 

  Recycled aggregate (RA) obtained from demolished concrete waste (CW) is beneficial owing to its applicability in recycled aggregate concrete (RAC). However, in designing RAC mix proportions, various impurities in the RA that can adversely affect the properties of the concrete, should be considered. Current RA production focuses on the physical quality of the RA without consideration of the impurities present. To improve the stable production and use of RAC, the amounts of deleterious impurities present and their effects on the concrete mix should be estimated. In this study, the risk associated with the presence of impurities in RA was defined as including the amount of impurity residue in the RA and the effects of impurities on RAC properties Both impurity types and RA production methods were considered in assessing risk for five building demolition scenarios. To quantify the risk, the amount of demolished building waste was estimated, the amount of CW was predicted, the RA ratio was calculated from the predicted amount of ON, and impurity sorting levels were investigated for nine methods of RA production. The impurity residue ratio per unit RA was estimated for each demolition scenario, RA production method, and RA quality level considered. A risk model is proposed in this paper that can be used to estimate the risk of RA adversely affecting RAC performance using information on the demolition scenario and the RA production method. (C) 2015 Elsevier B.V. All rights reserved.
• Utilization of CO2 Nanosized Bubble for Improving Quality of Recycled Concrete Aggregate

  Takafumi Noguchi, Ryoma Kitagaki, Han-sic Kim

  Thirteenth International Conference on Recent Advances in Concrete Technology and Sustainability Issues 2015/07
• Restrained shrinkage behavior of expansive mortar at early ages

  Hyeonggil Choi, Myungkwan Lim, Ryoma Kitagaki, Takafumi Noguchi, Gyuyong Kim

  CONSTRUCTION AND BUILDING MATERIALS 84 468 - 476 0950-0618 2015/06 

  The purpose of this study was to qualitatively assess the shrinkage reduction and cracking restraint of expansive additives under various restraint conditions. The reduction of drying and autogenous shrinkages on the addition of expansive additives was confirmed. The results of a ring test performed to determine restrained shrinkage indicated that at the same age, the cracking potential of expansive mortar based on the stress/strength ratio remained lower than that of normal mortar, which confirmed that the generation of compressive stress at an early age reduced the restrained stress and restrained cracking. From the time that cracking occurred, the expansive mortar showed substantial stress relaxation, reducing the tensile stress caused by the interface restraint load. Moreover, the use of expansive additives could reduce the degree of restraint under the same restraint condition, preventing the occurrence of cracking due to shrinkage. (c) 2015 Elsevier Ltd. All rights reserved.
• Disassembly Properties of Cementitious Finish Joints Using an Induction Heating Method

  Jaecheol Ahn, Takafumi Noguchi, Ryoma Kitagaki

  MATERIALS 8 (5) 2433 - 2453 1996-1944 2015/05 

  Efficient maintenance and upgrading of a building during its lifecycle are difficult because a cementitious finish uses materials and parts with low disassembly properties. Additionally, the reuse and recycling processes during building demolition also present numerous problems from the perspective of environmental technology. In this study, an induction heating (IH) method was used to disassemble cementitious finish joints, which are widely used to join building members and materials. The IH rapidly and selectively heated and weakened these joints. The temperature elevation characteristics of the cementitious joint materials were measured as a function of several resistor types, including wire meshes and punching metals, which are usually used for cementitious finishing. The disassembly properties were evaluated through various tests using conductive resistors in cementitious joints such as mortar. When steel fiber, punching metal, and wire mesh were used as conductive resistors, the cementitious modifiers could be weakened within 30 s. Cementitious joints with conductive resistors also showed complete disassembly with little residual bond strength.
• PPMS を用いた建築材料の熱伝導率測定 その 1-セメント硬化体の熱伝導率の測定-

  彌永宏之, 長田美咲, 北垣亮馬

  日本熱物性学会シンポジウム D131 0911-1743 2015
• PPMS を用いた建築材料の熱伝導率測定 その 2 EPS・XPS・ALC・石膏ボードの測定

  長田美咲, 彌永宏之, 北垣亮馬

  日本熱物性学会シンポジウム D132 0911-1743 2015
• 1H NMRを用いたセメント硬化体の細孔構造分析

  米村 美紀, 北垣 亮馬, 大窪 貴洋, 金 志訓

  コンクリート工学年次論文集 = Proceedings of the Japan Concrete Institute 日本コンクリート工学会 37 (1) 511 - 516 1347-4111 2015 

  ホワイトセメントを用いたセメント硬化体の細孔構造分析について， 1Hの横緩和時間分布の測定結果からHalperinらの方法を用いてゲル細孔領域に限定した空隙分布推定を行った。DSCサーモポロメトリーでの結果と比較することでその可能性について検討し，ピークの位置や形状について概ね整合性が確認された。サーモポロメトリーの分解能は2nm以上であるが，NMRはそれより小さい細孔に対しても有効である可能性があり，また短時間で測定できるという利点もある。ただし，今回はごく限られた条件の試料による結果にとどまるため，今後の精度の向上，定量化の手法については検討が必要である。
• CO2ナノバブルを用いた炭酸化反応による空隙充填効果に関する研究

  金 志訓, 北垣 亮馬, 割田 聖洋

  コンクリート工学年次論文集 日本コンクリート工学会 37 (1) 1543 - 1548 1347-4111 2015 

  コンクリート表面を炭酸化によって緻密化させる方法として，CO2ナノバブルを含む溶液を繰返し浸漬させる効果をW/Cの異なるモルタルごとに測定した。炭酸化による空隙充填効果を重量変化及び吸水率から検討し，W/Cが高い試験体ほどCO2ナノバブル水溶液による空隙充填効果が高い結果を確認した。また，生成した炭酸カルシウムが閉気孔を生成し空隙を閉塞させる効果をW/Cごとに検討し，W/Cが高いほど閉塞効果が高いことが確認された。
• Modeling of volume changes of concrete mixed with expansive additives

  Hyeonggil Choi, Heesup Choi, Myungkwan Lim, Takafumi Noguchi, Ryoma Kitagaki

  CONSTRUCTION AND BUILDING MATERIALS 75 266 - 274 0950-0618 2015/01 

  This study modeled volume changes of concrete mixed with expansive additives, a countermeasure to shrinkage. Volume changes of expansive paste are determined from the balance between the shrinkage of cement and the expansion of the additives. Therefore, in this study, volume changes were modeled by applying a balance to the hydrates of cement and the expansive additives. The shrinkage of cement was modeled by assuming that it is caused by capillary tension. This modeling was based on the behavior of the moisture inside the cement's pore structure, by taking into account the pore size distribution and the thermodynamic equilibrium state of the moisture. Using the concept of effective radius factor, the expansion of the expansive additives was modeled by considering the volume expansion of the additive particles caused by an increase in the outermost radius of particles of the hydration products that were formed at an early age. The values predicted by the model were consistent with the measured values, which confirms the model's validity. Furthermore, the volume changes of concrete were estimated with sufficient accuracy by analyzing the behavior of the paste using a composite model of aggregate and paste. (C) 2014 Elsevier Ltd. All rights reserved.
• Modelling of creep of concrete mixed with expansive additives

  Hyeonggil Choi, Myungkwan Lim, Heesup Choi, Takafumi Noguchi, Ryoma Kitagaki

  MAGAZINE OF CONCRETE RESEARCH 67 (7) 335 - 348 0024-9831 2015 

  The creep phenomenon of hardened cement mixed with expansive additives (EAs) was modelled by considering the creep performance of hydration products of cements and EAs under the assumption that the characteristics of hydration products of cements and EAs are fixed. A new composite model that is appropriate for particle conditions is proposed by considering the balance of the hydration products of cement and EA and the stress redistribution phenomenon of hydration products newly generated by the progress of hydration. Verification of the creep model indicated that the accumulated creep strains calculated by the model and those obtained through experiment were similar, thereby confirming that the model shows excellent estimation and evaluation performance. Furthermore, the stress could be sufficiently estimated by analysing the creep phenomenon corresponding to the progress of hydration under the restrained condition.
• CO2 emission reduction by reuse of building material waste in the Japanese cement industry

  Da-Young Oh, Takafumi Noguchi, Ryoma Kitagaki, Won-Jun Park

  RENEWABLE & SUSTAINABLE ENERGY REVIEWS 38 796 - 810 1364-0321 2014/10 

  CO2 emitted from calcination processes in kilns comprises 60% of all emissions from cement production. The chemical components of building materials, demolished inorganic building materials (DIBMs), and waste concrete powder (WCP) are similar to those of cement minerals. Therefore, if DIBMs are used as a cement substitute material along with limestone, the quantity of disposed waste and the use of limestone will likely be reduced, as will CO2 emissions during cement production. This study proposes a recycling method for recycled cement, using DIBMs and WCP as cement substitute materials, and the properties of trial recycled cement were evaluated. The mortar specimen using recycled cement showed a high compressive strength, as did the ordinary Portland cement mortar. According to the proposed composition, the producible recycled cement was derived from 0.5% to 9.1% of annual cement production (about 57.6 million tons) in Japan. Additionally, the CO2 reduction by usage of recycled cement ranged from 0.06 million tons to 0.72 million tons from the total annual CO2 emissions from cement production (about 29.4 million tons), using natural resources in Japan. (C) 2014 Elsevier Ltd. All rights reserved.
• Effective Recycling of Surface Modification Aggregate using Microwave Heating

  Heesup Choi, Ryoma Kitagaki, Takahumi Noguchi

  JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 12 (2) 34 - 45 1346-8014 2014/02 

  In this study, Author present a quantitative review of the mechanical performance, as well as the separation from the matrix and the recovery performance of surface modification coarse aggregate (SMCA) that was produced using aggregate, whose surface was modified using fine inorganic powder. Therefore, experiments were conducted to measure the compressive strength, microwave heating characteristics, distribution of the void volume, and chemical changes in SMCA concrete, as well as the recovery rate of the aggregate. The results of the experiments showed that reinforcing the interfacial transition zone, which is a weak part in concrete, by coating the surface of the original coarse aggregate with cement paste, can help suppress the occurrence of microcracks and improve the mechanical performance of the aggregate. Further, microcracking and the decomposition of hydrates were observed as a result of microwave heating. In other words, an increase in void size distribution and weakening of the hydrated cement paste led to the effective recovery of recycled coarse aggregate.
• Creep behavior of expansive concrete

  Hyeonggil CHOI, Myungkwan LIM, Takafumi NOGUCHI, Ryoma KITAGAKI

  Proceedings of ICMMA 2014 (The 8th international conference on multi-functinal materials and applications), 273 - 277 2014
• Development of Eco-Friendly Deconstruction Technologies for Recycling Construction Waste

  Myungkwan Lim, Heesup Choi, Hyeonggil Choi, Ryoma Kitagaki, Takahumi Noguchi

  Journal of Environmental Protection 5 (7) 2014
• Using Microwave Heating to Completely Recycle Concrete

  Heesup Choi, Myungkwan Lim, Hyeonggil Choi, Ryoma Kitagaki, Takahumi Noguchi

  Journal of Environmental Protection 5 (7) 2014
• Cost Estimation Sheet on Spreadsheet Software for Supporting City Planning Decision Making

  AI Hisatoshi, KITAGAKI Ryoma, KATAGIRI Yukiko, TAMURA Junko

  Theory and Applications of GIS 一般社団法人 地理情報システム学会 22 (1) 27 - 35 1340-5381 2014 

  This paper proposes a cost estimation sheet supporting decision making for city planning. The urban form is represented by 30 by 30 cells on the sheet and the cost is estimated regarding population distribution, population projection, maintenance cost of road network, water supply and sewerage network, and investment for new development site. The sheet first requests its user to input current population distribution and several cost parameters. Then the sheet designates the downtown cells. A distance from closest downtown cell is calculated for each cell, which is used for cost estimation. User will be asked to finalize the spatial plan where cells are given the following labels; downtown, to be developed as new sub centers, to be disengaged. The maintenance cost is calculated by number of cells, distance from closest downtown, and population within the cell. Finally, the sheet gives how long does it take until the saving of maintenance cost by disengagement will balance the development cost of new sub centers.

• ロードサイド型コンパクトシティ実現のための試算モデルの構築

  北垣 亮馬

  Sustainable Urban Regeneration, 東京大学 都市持続再生研究センター 31 2013/03
• ロードサイド型コンパクトシティ実現のための検討項目・事例２ コンポスト研究

  北垣 亮馬

  Sustainable Urban Regeneration, 東京大学 都市持続再生研究センター 31 2013/03
• モルタル中の鉄筋表面における腐食生成物の透磁率の違いが電磁誘導法鉄筋探査試験結果に及ぼす影響把握に関する基礎的研究

  熊英, 北垣亮馬, 野口貴文

  コンクリート工学年次論文集 35 (1) 2424-0281 2013
• APPLICATION TO BUILDINGS AND CRACKING CONTROL EFFECTS OF EXPANSION CONCRETE

  CHOI Hyeonggil, TSUJINO Masato, NOGUCHI Takafumi, KITAGAKI Ryoma

  Cement Science and Concrete Technology 一般社団法人 セメント協会 67 (1) 282 - 289 0916-3182 2013 

  The aim of this study is to qualitatively evaluate the cracking control effects of expansion concrete used in reinforced concrete building. The result of experiments in laboratory shows that autogenous shrinkage and drying shrinkage are suppressed by using expansive additive. The tensile stress-strength ratio is lower in expansion concrete than normal concrete under fully restrained condition. Compression stress could be effectively generated in early age in the walls and slabs in buildings by the use of expansive additive, and tensile stress due to drying shrinkage at later age eventually decreased. Additionally, visual observation at long-term ages shows that the cracking area of expansion concrete was approximately 35％ of normal concrete, which confirms that the use of expansive additive reduces concrete cracking in reinforced concrete buildings.
• Mechanical Property of Polymer Cement Mortar at High Temperature

  Hyungjun Kim, Takafumi Noguchi, Ryoma Kitagaki, Whajung Kim, Woosuk Kim

  7TH ASIAN SYMPOSIUM ON POLYMERS IN CONCRETE 273 - 280 2012 

  Repair and strengthening are significantly important for long service life of buildings against deteriorating durability, disaster and building fire especially. Polymer-modified cement mortar (PCM) has been extensively used as a high performance material particularly for finishing and repairing works in concrete building because of its excellent adhesion, waterproofing, resistance to chemical attack, and workability. As PCM contains organic polymer, it is necessary to clarify its mechanical properties at high temperature under fire, on which sufficient data are not enough and also not available. This study focused on the compressive strength and elastic modulus of various PCMs containing three types of polymers according to the types of polymer, unit-polymer content and polymer-cement ratio. As a result, PCM with 5% unit polymer content which polymer types are EVA and PAE, showed outstanding compressive strength at 20 similar to 400 degrees C. Modulus of elasticity of PCM showed a decreasing tendency according to unit-polymer content regardless of polymer type at elevated temperature.
• ENVIRONMENTAL IMPACT MINIMIZATION AND PERFORMANCE MAXIMIZATION IN CONCRETE RECYCLING, Structural Concrete

  Takafumi NOGUCHI, Ryoma KITAGAKI, Masato TSUJINO

  Structural Concrete, fib 11 (1) 2011/03
• Minimizing environmental impact and maximizing performance in concrete recycling

  Takafumi Noguchi, Ryoma Kitagaki, Masato Tsujino

  STRUCTURAL CONCRETE 12 (1) 36 - 46 1464-4177 2011/03 

  The sheer amount of concrete in use and in stock compared with other building materials throws up environmental issues such as the huge amount of CO2 emitted when cement and concrete are produced and transported and the enormous amount of waste generated when concrete is disposed of. In addition, we are beginning to deplete aggregate resources at a fast rate. Concrete has conventionally been regarded as being difficult to recycle. The construction industry has addressed these problems and carried out research and development regarding the recycling of concrete since the 1970s. Recycling technology has been shifting from simple crushing into scrubbing with some preparations to produce high-quality recycled aggregate for structural concrete, and recycling of concrete in a completely closed loop has now become technically feasible. This paper reviews the development history of recycling technologies in Japan from the viewpoint of the properties of recycled aggregate and recycled aggregate concrete as well as the environmental impact such as CO2 emissions and waste generation in recycling. The paper also presents the outline of completely recyclable concrete, with which closed-loop circulation of component materials is realized.
• Spatial Analysis of CO₂ emission in Concrete Industry Using Resource Recycling Simulator “ecoMA” Implementing Road Network

  MITANI Takuma, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi

  Journal of Life Cycle Assessment, Japan 日本LCA学会 7 (1) 79 - 83 1880-2761 2011 

  Objective. This study proposes a comprehensive method for calculating transporting distance on ecoMA. Moreover, as an example of the method’s application, the study conducted a simulation of material flow that meets the fresh concrete demand in four prefectures of Kanto region and calculated CO₂ emissions from the process of production and transportation.
  Results and Discussion. The share of CO₂ emissions from transportation was 5.7% for road distance, which was 1.2% higher than when linear distance was used. It was understood that total amount of CO₂ emissions from transportation is 1.3 times that of emissions when linear distance was used. Looking at the transportation of crushed stone, sand, cement (cement service station – fresh concrete factory) and cement (cement factory – cement services station), road distance was between 1.30 and 1.43 times greater than linear distance. For transportation of products other than fresh concrete, it was understood CO₂ emissions for road transportation are much higher than those for linear transportation. Furthermore, for cement (cement factory – cement service station), the ratios of CO₂ emissions for linear distance and road distance were large compared to crushed stone and sand, which are often transported over long distances from the suburbs to urban centers, and therefore it was understood that transportation distance caused by use of road distance depending on material types as well as geographic characteristics.
  Conclusions. By providing an example of ecoMA with a calculation module that can take road distance into account, this study demonstrated that it is possible to calculate CO₂ emissions accurately with consideration for road distance. As a result, it has become possible to quantitatively calculate how much larger CO₂ emissions are for road distance when compared to linear distance.
  
• COMPLETELY RECYCLABLE CONCRETE OF AGGREGATE-RECOVERY TYPE BY USING MICROWAVE HEATING

  TSUJINO Masato, NOGUCHI Takafumi, KITAGAKI Ryoma, NAGAI Hironori

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 76 (660) 223 - 229 1340-4202 2011 

  To build up a resource recycling society, the environmental issue of concrete is approached comprehensively with a new technique using aggregate coating with dielectric material and microwave heating. The increase of concrete strength is achieved by 1.2 times using improved coating agent mixed properly with silica-fume and by-product powder. The recovery of high-quality aggregate can also be achieved with low energy by using microwave heating selectively for coating layer. In addition, about 90% of original aggregate can be recycled. Thus, the trade-off relationship between “strength of concrete” and “recovery of aggregates” and another trade-off between “energy consumption” and “aggregate quality” have been solved simultaneously.
• Sectioral & spatial analysis of co2 emission in concrete industry using resource recycling simulator “ecoma” implementing actual road network

  Takuma Mitani, Ryoma Kitagaki, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Urbanization 2010/12
• Behavior of sectoral CO2 emission in concrete industry at the case of replacing ready-mixed concrete demands to pre cast concrete products

  Ryoma Kitagaki, Takuma Mitani, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Urbanization 2010/12
• Equilibrium point of CO2 emission and material reusability in concrete industry at the case of replacing ready-mixed concrete demands to pre cast concrete products

  Ryoma Kitagaki, Takuma Mitani, Hironori Nagai, Takafumi Noguchi

  2nd International Conference on Waste Engineering and Management 2010/10
• Completely Recyclable Concrete of Aggregate-recovery Type by Using Microwave Heating

  Ryoma Kitagaki, Masato Tsujino, Hironori Nagai, Takafumi Noguchi

  the 11th international conference on advance in concrete technology and sustainable development 2010/05
• Strategy to reduce CO2 in concrete industry, Green City Group

  Ryoma KITAGAKI

  the 1st Korea-China-Japan Young Researchers Workshop 2010/05
• Development of Eco-Friendly Building Material by Densification of Powders through Carbonation and Hydration after Pressure Forming

  Tokihiko Fukao, Ryoma Kitagaki, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Building Asia, Ansan, Korea 2010/02
• COMPLETELY RECYCLABLE CONCRETE OF AGGREGATE-RECOVERY TYPE BY A NEW TECHNIQUE USING AGGREGATE COATING

  TSUJINO Masato, NOGUCHI Takafumi, KITAGAKI Ryoma, NAGAI Hironori

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 75 (647) 17 - 24 1340-4202 2010 

  To build up a recyclable society, the environmental issue of concrete is approached comprehensively with a new technique using aggregate coating. The increase of concrete strength is achieved by 1.2 times using improved coating agent mixed properly with silica-fume and by-product powder. A similar effect is also affirmed even if applied to low-quality aggregate. A recycling performance shows that over 90% of aggregate can be recycled. In conclusion, the technique developed by this study is effective for the use of low-quality aggregate and the recycle of coarse aggregate as well as the solution of the environmental problem of concrete.
• INFLUENCE OF REGIONAL AND SCALE CHARACTERISTICS OF PLANTS ON CARBON DIOXIDE EMISSION INTENSITY OF CONCRETE-RELATED INDUSTRY BASED ON FIELD SURVEY

  IWATA Ayako, KANEMATSU Manabu, NOGUCHI Takafumi, NAGAI Hironori, KITAGAKI Ryoma, FUJIMOTO Satoshi

  AIJ Journal of Technology and Design 日本建築学会 16 (32) 43 - 48 1341-9463 2010 

  In this research, the carbon dioxide emission intensity of concrete-related industry is investigated based on field survey and discussions are made on influences of plant scale and regional characteristics. As a result, it is shown that the carbon dioxide emission intensity decreases with increase in the volume of annual production, because of the influence of productivity efficiency, and it varies widely at lower volume of annual production. And also the carbon dioxide emission intensity varies by the region depending on the distribution characteristic of plant scale, so that the carbon dioxide emission intensity in Hokkaido, where its productions are relatively-small, is higher than that in Tokyo metropolitan area.
• ENVIRONMENTAL IMPACT MINIMIZATION AND PERFORMANCE MAXIMIZATION IN CONCRETE RECYCLING

  Takafuno Noguchi, Ryoma Kitagaki

  2ND INTERNATIONAL CONFERENCE ON WASTE ENGINEERING MANAGEMENT, ICWEM 2010 73 60 - + 1461-1147 2010 

  The sheer amount of concrete in use and in stock compared with other building materials brings up the environmental issues such as the large amount of CO2 emitted when cement and concrete are produced and transported and the enormous amount of waste generated when concrete is disposed of Besides, aggregate resources are beginning to be depleted at a high speed Concrete has conventionally been regarded as being difficult to recycle The construction Industry has earned out research and development regarding the recycling of concrete since the 1970s in Japan In these days recycling technology has been shifting from simple crushing into scrubbing with some preparations to produce high-quality recycled aggregate for structural concrete The paper reviews the development history of recycling technologies in Japan from the viewpoint of the properties of recycled aggregate and recycled aggregate concrete as well as the environmental impact such as CO2 emission and waste generation in recycling The paper also presents a new technology for enhancing the properties of low quality recycled aggregate for structural use, and is concluded with a proposal toward closed loop resource recycling in concrete industry
• RESOURCE-FLOW SIMULATION IN CONCRETE-RELATED INDUSTRIES USING ecoMA-ENVIRONMENTAL EVALUATION OF CONCRETE-RELATED INDUSTRIES INCLUDING ADMIXTURES

  Hideki Yamagishi, Takuma Mitani, Ryoma Kitagaki, Hironori Nagai, Takafumi Noguchi

  2ND INTERNATIONAL CONFERENCE ON WASTE ENGINEERING MANAGEMENT, ICWEM 2010 73 205 - + 1461-1147 2010 

  In recent years reduction target of CO2 emission is declared in many countries CO2 emission and industrial waste are controversial issues in concrete related industries because of large amount emission Conventional admixtures of concrete, such as furnace blast slag and fly ash, are by-products from the industries other than concrete industries which significantly motivate to utilize for the low responsibility to their embodied CO2 emission as well as high contribution to improving mechanical properties of concrete in reducing cement consumption, However many researchers have mentioned the difficulties to evaluate quantitative effects for reducing CO2 emission using admixtures because of including CO2 emission in transportation In this paper, reduction of CO2 emission introducing admixtures in large quantity at Kanto region in Japan is quantitatively evaluated using ecoMA a kind of resource flow simulator As a simulation result of ecoma, it was quantitatively observed that CO2 emission is restrained through the replacement of admixture At the case of furnace blast slag and fly ash 3 million tons, and 0 55 million tons of CO2 are cut down respectively
• 香川県におけるコンクリート系廃棄物フローとその環境負荷低減に関する研究

  竹田真梨子, 北垣亮馬, 堺孝司

  コンクリート工学年次論文報告集 31 (1) 1903 - 1908 2424-0281 2009
• マルチエージェントシステムを応用した資源循環シミュレーション手法によるコンクリート関連廃棄物の動向予測

  藤本郷史, 北垣亮馬, 兼松学, 野口貴文, 間宮尚, 鈴木宏一

  日本LCA学会誌 2 222 - 228 2006
• APTITUDE ACCESSMENTS OF WOOD MATERIAL FLOWS INCLUDING FOREST RESOURCES FOR A DYNAMIC SUSTAINABLE SOCIETY

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi

  Journal of Environmental Engineering (Transactions of AIJ) 日本建築学会 70 (595) 141 - 148 1348-0685 2005 

  A comprehensive model for wood flows in Japan based on the statistics points out inefficiency that a lot of domestic thinned woods are disposed in spite of the consumption of non-cyclic forest resources from foreign countries for domestic use. Moreover, the model explains that various recycled products made of woodchip would cause decay of flexibility receiving secondary woodchip into the flow. Therefore, new methodologies are required to assess building materials supporting flexibilities of material flows for a dynamic sustainable society as well as existing methods of environmental assessment such as CO2, wastes, and resource consumptions. In existing researches the concept of "a sustainable society" has usually represented "a static society", but a society dreaming of "much more sustainable society" is not necessarily static forever even if material flows look sustainable. In this paper, Aptitude items for a dynamic sustainable society are designed and their effectiveness has been confirmed for assessing wood materials to satisfy these requirements.
• QUANTITATIVE EVALUATION OF VISUAL INFORMATION OF EXPOSED CONCRETES BY 2DIMENSIONAL FOURIER TRANSFORMATION

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 70 (597) 33 - 38 1340-4202 2005 

  Requirement of long-term use of existing buildings has been increasing in aspect of environmental and economical issues, and the visual impression of building materials from the view point of aesthetics is considered as an important factor for long-term use of buildings. In this research, the new methodology by using 2dimensional Fourier Transformation has been developed for evaluation of stains on exposed concrete surfaces. As a result, various shapes of stains on the constant distance have been explained by the slope of power spectra by frequencies which make up a digital image including stains.
• A METHOD OF VISUAL CHANGE ANALYSIS ON BUILDING CLADDINGS BY 2DIMENSIONAL FOURIER TRANSFORMATION

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi

  Journal of Structural and Construction Engineering (Transactions of AIJ) 日本建築学会 70 (597) 39 - 45 1340-4202 2005 

  Requirement of long-term use of existing buildings has been increasing in aspect of environmental and economical issues, and the visual impression from the view of building materials is considered as an important factor for long-term use of buildings. In this research, new methodology by using 2dimensional Fourier Transform is developed for evaluation of visual changes on exposed concrete finishing. As a result, mechanism of phenomena that the view of building materials changes depending on the observation distance could be explained by frequencies comprehensively.
• Basic Study on visual Assessment for Concrete Stain with 2 Dimention Fourie Transform

  KANEMATSU Manabu, KITAGAKI Ryoma, NOGUCHI Takafumi, TOMOSAWA Fuminori

  コンクリート工学年次論文報告集 日本コンクリート工学協会 22 (1) 211 - 216 1340-4741 2000/06/01 

  コンクリートの汚染、ひび割れ、表面劣化などの汚れの定量的評価手法の開発を目的として、実構造物のコンクリート壁面、躯体を対象として、CCDカメラから入力したデジタル画像の定量的評価に関する研究を行った。新しい手法である2次元フーリエ変換により得られたPSP画像の特性から、コンクリート表面の状態や汚れなどの評価ができることを確認し、基礎的知見を得た。

MISC

• 再生砕石の用途拡大のために今後必要な技術

  北垣亮馬  建設機械  60-  (1)  2024
• 断熱改修の効果検証 防水における断熱材の長期性能変化のメカニズムと断熱改修のすすめ方

  北垣亮馬  月刊防水ジャーナル  54-  (4)  2023
• Development of Radiation Shielding Material Using GOS and WHA as Aggregates

  中山幸一, 日塔光一, 鬼柳善明, 北垣亮馬, 加美山隆, 佐藤博隆  日本原子力学会春の年会予稿集(CD-ROM)  2023-  2023
• リニューアル・解体・再利用 4.再利用 再生砕石の利用拡大にむけて

  北垣亮馬  コンクリート工学  61-  (5)  2023
• 建設業における環境技術の最新動向 DAC(Direct-Air-Capture)コート コンクリート表層に塗布した含浸剤でCO₂吸収を促進

  齊藤亮介, 辻埜真人, エラクネス ヨガラジャ, 北垣亮馬  環境浄化技術  22-  (5)  2023
• ふるくてあたらしい中性化/炭酸化の新展開 5.既存構造物での検討 アミンを利用した既設コンクリートに対するCO₂固定促進手法

  齊藤亮介, エラクネス ヨガラジャ, 辻埜真人, 北垣亮馬  コンクリート工学  61-  (9)  2023
• モルタルの凍結融解抵抗性における化学混和剤の気泡による効果の再検証

  松島克矢, 齊藤陸斗, 呉多英, 北垣亮馬  セメント技術大会講演要旨(CD-ROM)  77th-  2023
• Indoor Environment Assessment of Apartments Using IoT Sensing

  河野徳郎, 池本洋一, 北垣亮馬, 鳥海哲史, 山崎俊彦  情報科学技術フォーラム講演論文集  22nd-  2023
• Accelerated Weathering Test of Polymers Exhibiting Self-Decelerating Degradation Behavior: A Consideration of the Validity of Comparing Degradation Status between Different Light Sources for Determining the Schwarzschild Parameter

  石田崇人, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2023-  2023
• EGA-MS-PCA法による架橋高分子の劣化解析-エポキシ樹脂の熱酸化劣化-

  石田崇人, 北垣亮馬, エラクネスヨガラジャ, 水門潤治, 新澤英之, 佐藤浩昭, 萩原英昭, 渡邉亮太  日本ゴム協会研究発表講演会講演要旨  2023-  2023
• Promoting CO₂ Fixation for Reinforced Concrete Using Amine

  齊藤亮介, 矢野慧一, 依田侑也, 辻埜真人, 西田朗, ELAKNESWARAN Yogarajah, 仙北久典, 坂入正敏, 伏見公志, 北垣亮馬  清水建設研究報告  101-  2023
• Development of simple evaluation device for CO₂ uptake rate for various building materials

  北垣亮馬, OH Dayoung, 増尾孝義, 黒田泰弘  日本建築仕上学会大会学術講演会研究発表論文集  2023-  2023
• MICROSTRUCTURAL CHANGES OF HARDENED CEMENT AND BLAST FURNACE CEMENT PASTE IN REPEATED DRY AND WET CONDITIONS

  KIM Jihoon, 山崎悠, 北垣亮馬, 濱幸雄  セメント・コンクリート論文集(Web)  75-  (1)  2022
• 建設系ウレタン発泡体の新しいリサイクル手法

  北垣亮馬  化学工学会年会研究発表講演要旨集(CD-ROM)  87th-  2022
• モルタル中の電食鉄筋の微視的構造変化に関する研究

  石倉我玖, 北垣亮馬, 依田侑也, 加美山隆  コンクリート工学年次論文集(CD-ROM)  44-  2022
• コンクリートの凍害劣化性状に及ぼす遷移帯の影響に関する研究

  松島克矢, 五嶋楓, 北垣亮馬  コンクリート工学年次論文集(CD-ROM)  44-  2022
• 建設汚泥の再生利用促進へ 公共工事の原材料として建設再生品を考察

  北垣亮馬  いんだすと  37-  (12)  2022
• 中性子透過ブラッグエッジ法とエッチング観察による電食鉄筋の微視的構造変化の把握に関する基礎研究

  石倉我玖, 北垣亮馬, 依田侑也, 加美山隆  セメント技術大会講演要旨(CD-ROM)  76th-  2022
• New mechanism for repairing concrete using interaction between silicate-based impregnant and water-based urethane

  辻本亜美, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2022-  2022
• Statistical survey of ready-mixed concrete production by nominal strength for estimating strength in reusing returned concrete

  大前祐樹, 船尾孝好, 北垣亮馬, 上田清, 竹内弓恵  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2022-  2022
• Study on Advantages and Possibility of Reinforced Concrete Block Structures in Global Perspective: Part 16: Regulation of dry shrinkage in product standards for concrete hollow blocks and test results

  吉野利幸, 楢府龍雄, 北垣亮馬, 石山祐二, 米澤稔, 白川和司  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2022-  2022
• Evaluating method for polymer deterioration using both solvent swelling purity test and water immersion test

  北居航, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2022-  2022
• Education (ESD) to scrutinize and evaluate CSR/ESG/SDGs from CSR reports of environmental geotechnical and industrial waste disposal industries and learn sustainable growth strategies

  水野克己, 乾徹, 大嶺聖, 北垣亮馬, 遠藤和人, 勝見武  土木学会全国大会年次学術講演会(Web)  77th-  2022
• Introduction of Education for a Sustainable Earth (ESD) Overview in The Earth and Muddy Department

  水野克己, 乾徹, 大嶺聖, 北垣亮馬, 遠藤和人, 勝見武  地盤工学研究発表会発表講演集(Web)  57th-  2022
• Development of a new type of radiation shielding material using gadolinium oxysulfide (GOS)

  中山幸一, 日塔光一, 加美山隆, 佐藤博隆, 北垣亮馬  アイソトープ・放射線研究発表会(Web)  59th-  2022
• ANALYTICAL METHODS OF FOAMED PLASTIC INSULATION DETERIORATED BY WATER

  LEEM Yoobin, 北垣亮馬  日本建築学会技術報告集(Web)  27-  (65)  2021
• Prediction of natural weathering of polycarbonate: Regional characteristics of aging behaviors and effect of “synchronicity” between UV irradiance and temperature

  石田崇人, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2021-  2021
• Simple Estimation Method of the Risk of Condominium Repair Fund Shortage part 1 Improving Location Identification Procedure

  北垣亮馬, 相尚寿, 石田崇人  日本建築仕上学会大会学術講演会研究発表論文集  2021-  2021
• Simple Estimation Method of the Risk of Condominium Repair Fund Shortage part 2 Applying the Method to Areas along Several Railway Lines in Tokyo

  相尚寿, 北垣亮馬, 石田崇人  日本建築仕上学会大会学術講演会研究発表論文集  2021-  2021
• Estimation method of Temperature and Humidity under the Floor of Wooden House Using PLS Analysis

  LEEM Yoobin, 北垣亮馬, 小暮直親, 永吉賢行, 三原典正, 平塚雄治  Thermophysical Properties (CD-ROM)  42nd-  2021
• Degradation mechanism of interfacial bonding between inorganic-organic material using organic film containing inorganic filler

  小島静, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Fundamental Study for the Development of Cement Free High Performance Concrete (Part 1: Strength Design Concept of CaO-Al₂O₃-SiO₂ Ternary System)

  LIAO Gaoyu, 兼松学, 松田拓, 友寄篤, 浅葉拓也, 坂本遼, 野口貴文, 小宮克仁, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Distribution of elastic modulus around interfacial transition zones influenced by aggregate species measured with nanoindentation

  橋本拓実, 辻埜真人, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Dimensional change of polyurethane coatings using Digital Image Correlation

  小師柚子, 三井鈴, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Relationship between Equilibrium Moisture Contents and N₂/water Vapor Adsorption Isotherm of Foamed Plastic Insulations and Evaluation of Moisture Saturation

  LEEM Yoobin, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Outline of “C⁴S R&D Project“ contributing to Moonshot Goal 4

  野口貴文, 兼松学, 田村雅紀, 丸山一平, 北垣亮馬, 藤本郷史, 辻埜真人, 平尾宙, 兵頭彦次, 増尾孝義  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Fundamental study on development of cement-free and high performance concrete: Part 2. Fluidity, Compressive strength, Static elasticity and Carbonation resistance

  飛鷹晶子, 坂本遼, 松田拓, 友寄篤, 浅葉拓也, 西尾悠平, 北垣亮馬, 兼松学, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Fundamental study on development of cement-free and high performance concrete. Part 4. Effect of Shrinkage reduction and Water-powder ratio.

  浅葉拓也, 坂本遼, 小宮克仁, 西尾悠平, 松田拓, 友寄篤, 北垣亮馬, 兼松学, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Influence of interfacial transition zones on frost damaged concrete

  五嶋楓, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Seismic Structural Survey of Historical Timber-Framed Stone Masonry Buildings in Otaru (Part2)-Structural Survey of The Architectural Heritage Damaged by Iburi-Tobu Earthquake of 2018 and Mechanical Test of The Joint-

  小瀧亮介, 花里利一, 駒木定正, 新津靖, 上北恭史, 石井建, 北垣亮馬, 東田秀美  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Real-time and remote diagnostics for facades using video conferencing tools and data analysis softwares

  鈴木康介, 三井鈴, 五嶋楓, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Prediction Model of Polycarbonate Aging in outdoor exposure

  石田崇人, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Repairing effects by hybrid application using silicate impregnate and water-based urethane on concrete

  徳廣美沙, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• Fundamental study on development of cement-free and high performance concrete: Part 3. Autogenous shrinkage and Drying shrinkage

  坂本遼, 松田拓, 友寄篤, 浅葉拓也, 文野光, 西尾悠平, 北垣亮馬, 兼松学, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2021-  2021
• ゲル化理論を逆に用いた光劣化に伴うウレタン架橋樹脂の大規模構造変化時期予測モデルの検討

  石田崇人, 北垣亮馬, エラクネスヨガラジャ, 萩原英昭  日本ゴム協会研究発表講演会講演要旨  2021-  2021
• A new concept of calcium carbonate concrete using demolished concrete and CO2

  Ippei Maruyama, Wataru Kotaka, Bui Ngoc Kien, Ryo Kurihara, Manabu Kanematsu, Hikotsugu Hyodo, Hiroshi Hirao, Ryoma Kitagaki, Masaki Tamura, Masato Tsujino, Satoshi Fujimoto, Takafumi Noguchi  Journal of Advanced Concrete Technology  19-  (10)  1052  -1060  2021  

  Countermeasures against carbon dioxide emissions are a concern in the construction field as well as in society. To solve this problem, a concept for new calcium carbonate concrete is proposed, and this concept is validated experimentally. In the proposed concept, calcium carbonate comprising Ca originating from demolished concrete or other Ca-containing industrial wastes and HCO3- from CO2 gas collected from the air or emitted by industrial plants acts as a binder for aggregates, which can be natural rocks or crushed demolished concrete. This short paper describes the details of the process of making calcium carbonate concrete and discusses future perspectives.
• 無機-有機界面接着部分の劣化メカニズムの把握 (日本建築仕上学会2020年大会発表論文(その2)性能評価セッション)

  小島 静, 北垣 亮馬  リフォーム  37-  (12)  72  -76  2020/12
• 発泡プラスチック系断熱材の水分による劣化の分析手法 (日本建築仕上学会2020年大会発表論文(その2)性能評価セッション)

  任 裕彬, 北垣 亮馬  リフォーム  37-  (12)  77  -81  2020/12
• 製品の品質管理の考え方、管理基準について : 建設汚泥再生品等の利用促進に関する検討会報告書から技術面を解説 (INDUST特集 建設汚泥再生品等の利用促進に向けて)

  北垣 亮馬  Indust = いんだすと : 産廃処理の総合専門誌  35-  (11)  26  -30  2020/11
• 建築仕上材料の促進劣化手法 (特集 長寿命建築のための材料、コンクリートの役割)

  北垣 亮馬  リフォーム  37-  (7)  60  -66  2020/07
• ケイ酸リチウム系補修材の補修メカニズムに関する基礎的研究

  徳廣 美沙, 北垣 亮馬  日本建築学会北海道支部研究報告集  (93)  5  -8  2020/06
• Investigation into the RC building retrofit by external insulation system 39 years ago

  足立裕介, 谷口円, 平川秀樹, 小浦孝次, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2020-  (93)  9  -12  2020/06
• AFMによるコンクリートの遷移帯部分の弾性率の評価

  橋本 拓実, 北垣 亮馬  日本建築学会北海道支部研究報告集  (93)  17  -20  2020/06
• Degradation mechanism of interfacial bonding between inorganic-organic material

  小島静, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2020-  2020
• Peeling performance of N-methylpyrrolidone at polymer interface and surface property changes of inorganic building materials after peeling

  三井鈴, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2020-  2020
• 水分が光劣化挙動に与える影響-架橋ウレタンのマルチスケール劣化解析-

  石田崇人, 北垣亮馬, ELAKNESWARAN Yogarajah, 萩原英昭  マテリアルライフ学会研究発表会  31st-  2020
• Seismic Structural Survey of Historical Timber-Framed Stone Masonry Buildings in Otaru

  松本彩楓, 花里利一, 駒木定正, 角幸博, 新津靖, 上北恭史, 飯場正紀, 北垣亮馬, 東田秀美  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2020-  2020
• Antisymmetric load of Cast-in-place concrete pile with low quality recycled aggregate concrete-Part 3: Shear properties of 6 months age-

  長橋璃久, 師橋憲貴, 北垣亮馬, 小川敦久  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2020-  2020
• Cell structure of foamed plastic insulations measured by μXray-CT

  LEEM Yoobin, 北垣亮馬  Thermophysical Properties (CD-ROM)  41st-  2020
• Change of moisture absorption and thermal conductivity of foamed plastic insulations exposed in constant humidity and temperature

  北垣亮馬, LEEM Yoobin  Thermophysical Properties (CD-ROM)  41st-  2020
• Change of swelling ratio and water content of foamed plastic insulations exposed in the cyclic condition composing of high humidity water immersion

  五嶋楓, LEEM Yoobin, 北垣亮馬  Thermophysical Properties (CD-ROM)  41st-  2020
• Relationship between equilibrium moisture contents and N₂/water vapor absorption isotherm of foamed plastic insulations and evaluation of moisture saturation

  徳廣美沙, LEEM Yoobin, 北垣亮馬  Thermophysical Properties (CD-ROM)  41st-  2020
• 歴史の効用 第2部:エンジニアリングから見た「歴史の効用」10 建築材料分野での研究における歴史的効用-高層ビル・集合住宅の歴史から材料学を考察する

  北垣亮馬  建築雑誌  135-  (1734)  2020
• 1657 建築用ウレタンコンポジット塗膜の熱劣化によるモルフォロジーの変化メカニズム

  谷藤 貴生, 北垣 亮馬  材料施工  2019-  (2019)  1313  -1314  2019/07/20
• 1656 クリア塗膜と有色塗膜の間での紫外線劣化シナリオの本質的差異

  北垣 亮馬, 石田 崇人  材料施工  2019-  (2019)  1311  -1312  2019/07/20
• 1386 水酸化カルシウムコロイド溶液を用いた補修工法がモルタル表面に及ぼす影響

  米谷 怜, 北垣 亮馬, 谷藤 貴生  材料施工  2019-  (2019)  771  -772  2019/07/20
• 23104 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の中心圧縮加力 その1 材齢5週時における圧縮性状

  秋間 大志, 師橋 憲貴, 北垣 亮馬, 小川 敦久  構造IV  2019-  (2019)  207  -208  2019/07/20
• 23103 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の逆対称加力 その2 材令6週時におけるせん断性状

  長橋 璃久, 師橋 憲貴, 北垣 亮馬, 小川 敦久  構造IV  2019-  (2019)  205  -206  2019/07/20
• 23102 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の逆対称加力 その1 せん断試験体の実験計画

  師橋 憲貴, 長橋 璃久, 北垣 亮馬, 小川 敦久  構造IV  2019-  (2019)  203  -204  2019/07/20
• 架橋ウレタンの光劣化に伴う内部組織構造変化シナリオとその起源

  石田崇人, 北垣亮馬, 萩原英昭  マテリアルライフ学会研究発表会  30th-  2019
• 屋外暴露された高分子の劣化機構における環境依存性に関する近年の動向

  北垣亮馬, 渡辺真  スガウェザリング学術講演会要旨  69th-70th-  2019
• マンションの修繕積立金の分布に関する基礎的研究(2018年度版)

  谷口誠, 石田崇人, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2019-  2019
• 促進凍結融解試験の最低温度が低水セメント比コンクリートの破壊性状に及ぼす影響

  東優太朗, 北垣亮馬, 千歩修  セメント技術大会講演要旨(CD-ROM)  73rd-  2019
• Assessment of Thermal Insulation and Sound Performance of Apartments Based on IoT Sensing

  山崎俊彦, 大渕友暉, LIN Yuan, 北垣亮馬, 鳥海哲史, 林幹久, 酒井藍, 芳賀宣仁, 野村眞平, 池本洋一  人工知能学会全国大会論文集(Web)  33rd-  2019
• Health monitoring of tile structures via non-contact laser excitation/measurement technique

  SUZUKI Kengo, SASAKI Motoaki, SAITO Ryosuke, KITAGAKI Ryoma, KAJIWARA Itsuro  The Proceedings of Mechanical Engineering Congress, Japan  2019-  (0)  J40110P  2019  

  In this research, we propose a method to evaluate the adhesion of exterior tiles based on non-contact laser excitation/measurement technology using laser-induced plasma. In this method, laser ablation is used for excitation, and a laser Doppler vibrometer is used for measurement. A test specimen including tiles with insufficient adhesion is manufactured and evaluated. As a result of the laser excitation experiments, we found that the power spectrum increased in a specific frequency band at the floating part compared with the sound part. Furthermore, RT method was applied to the measurement data, resulting in a quantitative extraction of characteristic change due to the insufficient adhesion of the tiles.

• 1697 温冷繰返しによる発泡プラスチック系断熱材(XPS)の水分浸透の分析

  久永 真子, 北垣 亮馬, 石田 崇人, 輿石 直幸, 宮内 博之, 山本 大地  材料施工  2018-  (2018)  1393  -1394  2018/07/20
• 1667 ポリウレタン樹脂系塗膜の濡れ性に対する顔料濃度の影響

  石田 崇人, 北垣 亮馬  材料施工  2018-  (2018)  1333  -1334  2018/07/20
• 1573 ニューヨーク市および台北市の外壁落下リスク対策の制度比較

  秦 賢治, 北垣 亮馬, 橘高 義典, 田村 雅紀, 堀 竹市, 渡辺 清彦  材料施工  2018-  (2018)  1145  -1146  2018/07/20
• 1166 解体工事における構造種類別・工程別の歩掛・平米作業単価と規模効果に関する調査

  金 志訓, 北垣 亮馬, 石田 崇人  材料施工  2018-  (2018)  331  -332  2018/07/20
• 23035 低品質再生骨材コンクリート梁部材の付着割裂強度 その3 材齢1年時のひび割れ性状

  師橋 憲貴, 日野 優輝, 小川 敦久, 北垣 亮馬  構造IV  2018-  (2018)  69  -70  2018/07/20
• 23034 低品質再生骨材コンクリート梁部材の付着割裂強度 その2 材齢1年時の乾燥収縮性状

  日野 優輝, 師橋 憲貴, 小川 敦久, 北垣 亮馬  構造IV  2018-  (2018)  67  -68  2018/07/20
• 温湿度制御型紫外線照射装置による光劣化メカニズムの温度依存性―建築材料用ウレタン塗膜の物理化学的性質変化―

  北垣亮馬ほか  塗装工学  53-  (4)  2018/04
• コンクリート工事管理の効率化に向けたセンサ搭載型枠の活用 : さまざまなコンクリート工事の省力化にむけた適用事例

  北垣 亮馬  建設機械  54-  (3)  38  -41  2018/03
• 建築塗装の保護・耐久性能を評価する昇温脱離法を用いた多品種ガスの拡散係数同時測定評価技術

  北垣亮馬  高分子学会  67-  (2)  2018/02
• 2017台日建築外装材の診断・改修技術シンポジウム参加報告

  橘高 義典, 田村 雅紀, 北垣 亮馬, 堀 竹市, 渡辺 清彦, 蝦名 浩二, 成田 至弘, 蛇口 洋平  リフォーム  35-  (2)  26  -31  2018/02
• ウレタンクリア塗膜の光劣化機構の温度依存性と物性変化メカニズムの検討

  石田崇人, 北垣亮馬  高分子学会予稿集(CD-ROM)  67-  (1)  2018
• 陽電子寿命測定及び膨潤度測定を用いた紫外線劣化を受けるウレタンクリア塗膜の微視的構造変化の検出

  石田崇人, 北垣亮馬, 萩原英昭  マテリアルライフ学会研究発表会  29th-  2018
• ウレタンクリア塗膜の光劣化機構の温度依存性及び膨潤度測定を用いた劣化によるモルフォロジー変化に関する一考察

  石田崇人, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2018-  2018
• 陽電子寿命測定及び膨潤度測定を用いた紫外線劣化によるウレタン塗膜の微視的構変化の温度依存性

  石田崇人, 北垣亮馬, 萩原英昭  高分子分析討論会講演要旨集  23rd-  2018
• 紫外線劣化を受けるウレタンクリア塗膜の空隙構造変化メカニズムに関する研究

  石田崇人, 北垣亮馬  高分子学会予稿集(CD-ROM)  67-  (2)  2018
• 各種センサ等によるコンクリート工事における品質管理の高度化技術の開発(その1)

  孫博超, 野口貴文, 北垣亮馬, 友寄篤, 西島茂行, 山本秀之, 山内匡  土木学会年次学術講演会講演概要集(CD-ROM)  73rd-  2018
• 各種センサ等によるコンクリート工事における品質管理の高度化技術の開発(その2)

  北垣亮馬, 野口貴文, 友寄篤, 西島茂行, 山本秀之, 山内匡  土木学会年次学術講演会講演概要集(CD-ROM)  73rd-  2018
• 各種センサ等によるコンクリート工事における品質管理の高度化技術の開発(その3)

  山内匡, 野口貴文, 北垣亮馬, 西島茂行, 山本秀之, 江頭勝吾  土木学会年次学術講演会講演概要集(CD-ROM)  73rd-  2018
• 各種センサ等によるコンクリート工事における品質管理の高度化技術の開発(その4)

  山本秀之, 西島茂行, 野口貴文, 北垣亮馬, 山内匡  土木学会年次学術講演会講演概要集(CD-ROM)  73rd-  2018
• 東京ブランド再生砕石の多用途出荷に伴う変化による広域的な二酸化炭素排出量削減効果の可能性

  北垣亮馬ほか  INDUST  2018/01
• 連載 ポストオリンピックにおけるスタジアムのデザインと利用形態の変化に関する調査報告(第1部||2016-17 特集・連載レビュー)

  北垣 亮馬  建築雑誌  (1705)  15  -15  2017/12/20
• vol.131 No.1690＝2016年11月号:建築系ビッグデータの実装・運用における課題整理(第1部||2016-17 特集・連載レビュー)

  北垣 亮馬  建築雑誌  (1705)  9  -9  2017/12/20
• vol.131 No.1688＝2016年9月号:建築業における国際化の論点整理(第1部||2016-17 特集・連載レビュー)

  北垣 亮馬  建築雑誌  (1705)  8  -8  2017/12/20
• vol.131 No.1681＝2016年3月号:災害対策研究の新しい起点(第1部||2016-17 特集・連載レビュー)

  北垣 亮馬  建築雑誌  (1705)  6  -6  2017/12/20
• 東京ブランド再生砕石「“粋な”えこ石」の品質評価の仕組みと概要

  北垣亮馬ほか  INDUST  2017/12
• 東京ブランド再生砕石「"粋な"えこ石」(下)多用途出荷に伴う変化による広域的な二酸化炭素排出量削減効果の可能性

  北垣 亮馬, 永井 文男, 細沼 順人, 高橋 仁  Indust = いんだすと : 産廃処理の総合専門誌  32-  (12)  54  -58  2017/12
• 東京ブランド再生砕石「"粋な"えこ石」(上)都市部のサステナビリティ強化に向けた品質評価の仕組みと概要

  北垣 亮馬, 永井 文男, 細沼 順人, 高橋 仁  Indust = いんだすと : 産廃処理の総合専門誌  32-  (11)  62  -67  2017/11
• 「東京ブランド"粋な"えこ石」の品質基準および利活用 (特集 最近の地盤材料改良技術)

  永井 文男, 北垣 亮馬, 細沼 順人, 高橋 仁  基礎工 = The foundation engineering & equipment, monthly : 土木・建築基礎工事と機材の専門誌  45-  (9)  36  -40  2017/09
• 1584 光熱同時劣化を受ける建材用塗膜の劣化反応メカニズムの温度依存性

  石田 崇人, 北垣 亮馬  材料施工  2017-  (2017)  1167  -1168  2017/07/20
• 産業副産物・災害廃棄物の地盤工学的利用(3)コンクリート塊

  黒田 泰弘, 北垣 亮馬  地盤工学会誌 = Geotechnical engineering magazine : 土と基礎  65-  (5)  43  -50  2017/05
• 主旨(<特集>熊本地震から見えてきたもの)

  壁谷澤 寿一, 北垣 亮馬, 高橋 典之, 聲高 裕治, 土屋 直子, 大村 紋子, 西原 直枝  建築雑誌  (1697)  4  -4  2017/04/20
• 主旨(<特集>建築をとりまく「選択と集中」)

  高橋 典之, 壁谷澤 寿一, 北垣 亮馬, 小泉 秀樹, 小林 光, 谷川 竜一, 中島 伸  建築雑誌  (1692)  6  -7  2017/01/20
• 吸水過程における木材内部の水分状態と寸法変化

  松本悠実, 近藤寿華, 野口貴文, 北垣亮馬  日本木材学会大会研究発表要旨集(完全版)(CD-ROM)  67th-  2017
• 光熱同時劣化を受ける建材用高分子塗膜の化学構造及びマクロ物性変化に関する研究

  石田崇人, 北垣亮馬  日本建築仕上学会大会学術講演会研究発表論文集  2017-  2017
• 光熱同時劣化を受ける建材用有機系高分子塗膜の劣化反応機構の温度依存性及びそれに伴うマクロ物性変化に関する研究

  石田崇人, 北垣亮馬  高分子学会予稿集(CD-ROM)  66-  (2)  2017
• 型枠の内外温度を用いたコンクリートの中心温度推定手法に関する基礎的研究

  北垣亮馬, 野口貴文, 西島茂行, 山本秀之  土木学会年次学術講演会講演概要集(CD-ROM)  72nd-  2017
• 型枠に設置したセンサによるコンクリート締固め時の振動加速度測定に関する実験

  山内匡, 千賀年浩, 野口貴文, 北垣亮馬, 西島茂行, 山本秀之  土木学会年次学術講演会講演概要集(CD-ROM)  72nd-  2017
• Rapid Carbonation Method to Concrete Surface Using Micro/Nano Bubble

  北垣亮馬  精密工学会誌(Web)  83-  (7)  2017
• 光熱同時劣化を受ける建材用有機系高分子塗膜の劣化反応機構の温度依存性及びそれに伴うマクロ物性変化に関する研究

  石田崇人, 北垣亮馬  ポリマー材料フォーラム講演予稿集  26th-  2017
• Water absorption of insulation material confronting liquid water under cyclic fluctuating temperature control

  石田崇人, 北垣亮馬  Thermophysical Properties  38th-  2017
• Modeling temperature and humidity dependency of thermal conductivity of foam insulations based on measured values

  北垣亮馬, 長田美咲, 石田崇人  Thermophysical Properties  38th-  2017
• 衣・食・住に入り込む先端メディア技術 6章 住に関する研究最先端~不動産ビッグデータから見る建築物の性能の価格反映性について~

  北垣亮馬  映像情報メディア学会誌  71-  (6)  2017
• 6. Price Reflectivity of Building Performance Interpreted by Big Data of Real Estate

  Kitagaki Ryoma  The Journal of The Institute of Image Information and Television Engineers  71-  (11)  778  -781  2017
• Efficiency Improvement of Concrete Construction using Formwork Embedded with Sensors

  Kitagaki R.  Concrete Journal  55-  (9)  796  -799  2017
• 「東京ブランド"粋な"えこ石」の品質管理の仕組みと建設リサイクルのこれから

  北垣 亮馬, 永井 文男, 細沼 順人, 高橋 仁  建設リサイクル  81-  34  -37  2017
• 主旨(<特集>建築系ビッグデータの実装・運用における課題整理)

  北垣 亮馬, 小林 光, 髙橋 典之, 谷川 竜一, 樋山 恭助, 宮田 征門  建築雑誌  (1690)  4  -4  2016/11/20
• 昇温脱離法を用いたセメント硬化体中のH₂O,CO₂,Cl同時定量測定に関する研究

  北垣 亮馬  高速道路と自動車 = Expressways and automobiles  59-  (11)  46  -51  2016/11
• 主旨(<特集>生活を変えるニューテクノロジー)

  大岡 龍三, 川久保 俊, 川添 善行, 北垣 亮馬, 聲高 裕治, 小林 光, 樋山 恭助  建築雑誌  (1685)  4  -5  2016/06/20
• 主旨(<特集>災害対策研究の新しい起点)

  壁谷澤 寿一, 北垣 亮馬, 高橋 典之, 谷川 竜一, 樋本 圭祐  建築雑誌  131-  (1681)  4  -4  2016/03/20
• ケイ酸ナトリウムを補修剤として用いたセメント硬化体の化学的変化に関する基礎的な研究

  金志訓, 北垣亮馬, 木戸聡  コンクリート工学年次論文集(CD-ROM)  38-  2016
• リサイクルに向けて洗浄による焼却灰の塩素除去

  張翔, ドドビバジョルジ, 北垣亮馬, 山本中一, 月澤麻衣, 坂井慶太, 藤田豊久  資源・素材学会春季大会(Web)  2016-  2016
• 1453 Measurement of gas permeability coefficients and diffusion coefficients of coatings using TDS

  MIURA Risa, KITAGAKI Ryoma  Summaries of technical papers of annual meeting  2015-  (2015)  905  -906  2015/09/04
• 1535 Effect of moisture in peeling of glued laminated timber

  MATSUMOTO Yumi, NOGUCHI Takafumi, KITAGAKI Ryoma  Summaries of technical papers of annual meeting  2015-  (2015)  1069  -1070  2015/09/04
• 集成材のはく離に及ぼす水分の影響に関する研究

  松本悠実, 野口貴文, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2015-  2015
• 昇温脱離法分析装置による塗膜の気体透過・拡散係数の測定方法に関する研究

  三浦梨紗, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2015-  2015
• ¹H NMRを用いたセメント硬化体の細孔構造分析

  米村美紀, 北垣亮馬, 大窪貴洋, 金志訓  コンクリート工学年次論文集(CD-ROM)  37-  2015
• CO₂ナノバブルを用いた炭酸化反応による空隙充填効果に関する研究

  金志訓, 北垣亮馬, 割田聖洋  コンクリート工学年次論文集(CD-ROM)  37-  2015
• 41028 Incident angle dependence on heat transportation including solar radiation of material surface

  Kumada Kento, Kitagaki Ryoma  Summaries of technical papers of annual meeting  2014-  (2014)  55  -56  2014/09/12
• 1197 Basic Study on the Chloride Permeability of Concrete Structure Caused by Tsunami pressure

  SUZUKI Ayaka, KITAGAKI Ryoma  Summaries of technical papers of annual meeting  2014-  (2014)  393  -394  2014/09/12
• 1406 Humidity dependency of longitudinal tensile creep of wood

  Kamamura Chihiro, Kitagaki Ryoma  Summaries of technical papers of annual meeting  2014-  (2014)  811  -812  2014/09/12
• 1539 Comprehensive analysis on deterioration of coating material exposed to accelerated UV

  MATSUMOTO Yumi, NOGUCHI Takafumi, KITAGAKI Ryoma, KANAYA Hitomi  Summaries of technical papers of annual meeting  2014-  (2014)  1077  -1077  2014/09/12
• 1583 Measurement of CO2 and Cl in cement paste using TPD

  NAKAGIRI Takahiro, KITAGAKI Ryoma, MIYABAYASHI Nobuyoshi  Summaries of technical papers of annual meeting  2014-  (2014)  1165  -1166  2014/09/12
• 昇温脱離法を用いたセメント硬化体の中性化・塩分固定量の分析手法に関する研究

  中桐卓大, 北垣亮馬, 宮林延良  セメント技術大会講演要旨(CD-ROM)  68th-  2014
• 余剰ペースト理論とレオロジー定数を用いた粗骨材の表面改質ペーストの膜厚に関する研究

  崔希燮, 崔希燮, 北垣亮馬, 野口貴文  コンクリート工学年次論文集(CD-ROM)  36-  2014
• 木材縦引張クリープの測定手法の提案と湿度依存性に関する基礎的研究

  鎌村ちひろ, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2014-  2014
• 建築用塗料の紫外線劣化に関する統合的分析手法に関する研究

  松本悠実, 野口貴文, 北垣亮馬, 金谷瞳  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2014-  2014
• 昇温脱離法を用いたセメント硬化体の中性化・塩分固定量の分析手法に関する研究

  中桐卓大, 北垣亮馬, 宮林延良  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2014-  2014
• セメント硬化体表面の微細形状と日射熱移動の日射角度依存性に関する基礎的研究

  熊田賢人, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2014-  2014
• 津波流体圧によるコンクリート構造物への塩分浸透に関する基礎的研究

  鈴木彩夏, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2014-  2014
• 外壁タイル自動剥離診断機の信頼性評価研究委員会報告(委員会報告 外壁タイル自動剥離診断機の信頼性評価委員会)

  近藤 照夫, 北垣 亮馬  Finex  26-  (155)  36  -39  2014
• 1245 The Influence of the Coarse Aggregate with Surface Modification Treatment on the Mechanical Properties of Concrete

  CHOI Heesup, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2013-  (2013)  489  -490  2013/08/30
• 1491 Thermal insulating properties of a curtain coated by thermal barrier coating including voided ceramic beads

  YAEGASHI Ryo, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2013-  (2013)  981  -982  2013/08/30
• 1493 Loose Scale Control Using Water Based Acrylic Rubber with Sodium Nitrite Added

  ISHITSUKA Takao, FUKUYAMA Tomoko, KITAGAKI Ryoma, NOGUCHI Takafumi, SASAKI Yoshihiko  Summaries of technical papers of annual meeting  2013-  (2013)  985  -986  2013/08/30
• 1697 Characterization of cement produced from inorganic construction waste

  OH Dayoung, NOGUCHI Takafumi, KITAGAKI Ryoma  Summaries of technical papers of annual meeting  2013-  (2013)  1393  -1394  2013/08/30
• スマートセンサ型枠を用いた橋脚コンクリート工事・品質管理システム

  野口 貴文, 北垣 亮馬, 西島 茂行  建設機械施工 : 一般社団法人日本建設機械施工協会誌 : journal of JCMA  65-  (8)  58  -61  2013/08/25
• D-01 A Study on the Performance Improvement of Surface Modification Concrete using Low-quality Crushed Aggregate

  CHOI Heesup, KITAGAKI Ryoma, NOGUCHI Takafumi  日本建築学会東北支部研究報告集. 構造系  (76)  121  -122  2013/06/22
• 1018 合板型枠とリブ付き樹脂型枠のカーボンフットプリント比較に向けた基礎情報の整理(材料・施工)

  田村 雅紀, 鈴木 誠二, 北垣 亮馬, 野口 貴文  日本建築学会関東支部研究報告集  83-  (83)  69  -72  2013/03
• 総合的なコンクリート工事・品質管理システム : センサ搭載型枠

  野口 貴文, 北垣 亮馬, 西島 茂行  建設の施工企画  (756)  32  -36  2013/02/25
• 低環境負荷再生骨材コンクリートの強度・弾性係数に及ぼす再生細骨材の改質と微粉の影響

  六名良輔, 堺孝司, 北垣亮馬, 名取正夫  コンクリート工学年次論文集(CD-ROM)  35-  2013
• コンクリート表面の明度および光沢度に及ぼす表面性状の影響に関する研究

  深尾宙彦, 北垣亮馬, 佐藤幸恵, 野口貴文  コンクリート工学年次論文集(CD-ROM)  35-  2013
• 中空セラミックビーズ塗料を塗布したロールカーテンの遮熱性・断熱性に関する研究

  八重樫涼, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2013-  2013
• スマートセンサ型枠システムのスライドセントルへの適用(その2)

  北垣亮馬, 山内匡, 甲田展丈, 甲田展丈, 江頭勝吾, 古森崇史  土木学会年次学術講演会講演概要集(CD-ROM)  68th-  2013
• 表面改質処理を施した粗骨材がコンクリートの力学的特性に及ぼす影響

  CHOI Heesup, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2013-  2013
• 無機系建築材料のリサイクルを通じたセメント製造とその特性に関する研究

  OH Dayoung, 野口貴文, 北垣亮馬  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2013-  2013
• 1008 Electrochemical Corrosion Control Mechanism of Water-based Acrylic Rubber

  ISHITSUKA Takao, FUKUYAMA Tomoko, KITAGAKI Ryoma, NOGUCHI Takafumi, SASAKI Yoshihiko  Summaries of technical papers of annual meeting  2012-  (2012)  15  -16  2012/09/12
• 1124 A Study on the Influence of Surface Property upon the Color of Exposed Concrete

  FUKAO Tokihiko, SATO Sachie, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  247  -248  2012/09/12
• 1327 Quality control system in curing concrete using small integrated circuit on formworks : part 1. Capacitance sensor system for automatic measurement and compressive strength estimation

  Nishijima Shigeyuki, Noguchi Takafumi, Kitagaki Ryoma, Yamamoto Hideyuki  Summaries of technical papers of annual meeting  2012-  (2012)  653  -654  2012/09/12
• 1328 Quality control system in curing concrete using small integrated circuit on formworks : part 2. Wireless networking system for collecting and visualizing distribution of compressive strength on concrete.

  Yamamoto Hideyuki, KITAGAKI Ryoma, Noguchi Takafumi, Nishijima Shigeyuki  Summaries of technical papers of annual meeting  2012-  (2012)  655  -656  2012/09/12
• 1372 Evaluation of Restrained Shrinkage Properties of Expansive Mortar in Early Ages

  CHOI Hyeonggil, TSUJINO Masato, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  743  -744  2012/09/12
• 1498 Thermal insulating properties depending on surface characterization of thermal barrier/insulating coatings

  YAEGASHI Ryo, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  995  -996  2012/09/12
• 1539 Study on Precipitation of Calcium Carbonate in Concrete Pore Solution

  KIM Hansic, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  1077  -1078  2012/09/12
• 1541 Synthesis of Multi-Agent System Based on the Evolutionary Method And Its Applications to the Field of Concrete Industry

  Oh Dayoung, Yamagishi Hideki, Kitagaki Ryoma, Noguchi Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  1081  -1082  2012/09/12
• 1547 Evaluation method for energy saving effect of insulations and exterior materials in a building's service life coupled with carbon footprint

  Kitagaki Ryoma, Noguchi Takafumi, Yamagishi Hideki  Summaries of technical papers of annual meeting  2012-  (2012)  1093  -1094  2012/09/12
• 1600 Development of a method to make existing RC structures fragile : using the principle of induction heating

  LIM Myungkwan, SHIN Sangheon, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of annual meeting  2012-  (2012)  1199  -1200  2012/09/12
• スマートセンサ型枠と総合的なコンクリート工事・品質管理システム

  北垣亮馬, 野口貴文  建設ジャーナル  2012/03
• 廃コンクリートの低環境負荷完全リサイクルに関する研究

  河村景史, 堺孝司, 錦織和紀郎, 北垣亮馬  コンクリート工学年次論文集(CD-ROM)  34-  2012
• 建築物における膨張コンクリートの膨張収縮挙動およびひび割れ抑制効果

  崔亨吉, 辻埜真人, 野口貴文, 北垣亮馬  コンクリート工学年次論文集(CD-ROM)  34-  2012
• マイクロ波加熱方式を用いた表面改質骨材の完全回収および有効利用に関する研究

  崔希燮, 北垣亮馬, 野口貴文  コンクリート工学年次論文集(CD-ROM)  34-  2012
• コンクリート細孔溶液中における炭酸カルシウムの析出に関する研究

  KIM Hansic, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 誘導加熱方式を利用した既存RC部材の解体技術開発(その2.鉄筋の昇温特性)

  LIM Myungkwan, LIM Myungkwan, SHIN Sangheon, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 進化論的手法を用いたマルチエージェントシステムの構築とそのコンクリート産業分野への適用

  OH Dayoung, 山岸英輝, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 遮熱断熱塗料の表面性状と断熱性に関する研究

  八重樫涼, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 打放しコンクリートの色彩に及ぼす表面性状の影響に関する研究

  深尾宙彦, 佐藤幸惠, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• スマートセンサ型枠システムを利用したコンクリートの養生・品質管理システムの開発

  野口貴文, 北垣亮馬, 西島茂行, 山本秀之  土木学会年次学術講演会講演概要集(CD-ROM)  67th-  2012
• スマートセンサ型枠システムの無線ネットワーク化による現場管理・温度分布・推定強度分布の可視化

  北垣亮馬, 野口貴文, 西島茂行, 山本秀之  土木学会年次学術講演会講演概要集(CD-ROM)  67th-  2012
• 無機質系材料を利用した表面改質骨材コンクリートの基礎的力学性能に関する研究

  CHOI Hee-sup, 北垣亮馬, 野口貴文  日本学術会議材料工学連合講演会講演論文集  56th-  2012
• 断熱材料,外装材料の供用時の省エネ効果とCFPの連成を考慮した環境性能評価手法に関する基礎的研究

  北垣亮馬, 野口貴文, 山岸英輝  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 初期材齢における膨張モルタルの拘束収縮特性の評価

  CHOI Hyeonggil, 辻埜真人, 北垣亮馬, 野口貴文  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 電気化学的手法による水系アクリルゴムの防錆メカニズムの検討

  石塚貴夫, 福山智子, 北垣亮馬, 野口貴文, 佐々木善彦  日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)  2012-  2012
• 日本建築仕上学会 主催 建築仕上材料技術・デザイン競技2012「新しい建築空間を実現する建築仕上材料とその技術提案」開催報告

  北垣 亮馬  Finex  24-  (144)  28  -32  2012
• 1026 炭酸ナノバブル水を用いた低品質再生細骨材の再資源化に関する基礎的研究

  金 翰〓, 北垣 亮馬, 野口 貴文  日本建築学会関東支部研究報告集  82-  (82)  101  -104  2012/01
• マイクロ波を利用した骨材回収型完全リサイクルコンクリート技術に関する研究(無機質系材料を利用した改質被覆骨材の基礎的力学性能の評価について)

  崔希燮, 飯田康介, 北垣亮馬, 野口貴文  セメント技術大会講演要旨(CD-ROM)  65th-  2011
• 超微小発泡ゲル蓄冷剤を用いた省エネ改修法!

  北垣亮馬  月刊リフォーム  28-  (11)  2011
• 廃コンクリート微粉末を用いた水中のイオンの除去

  酒井宏治, 北垣亮馬, 栗栖太, 野口貴文, 滝沢智  環境工学研究フォーラム講演集  48th-  2011
• 香川県における廃コンクリートとそのCO₂排出量に関する現状と将来予測

  竹田真梨子, 堺孝司, 北垣亮馬  コンクリート工学年次論文集(CD-ROM)  33-  2011
• マルチモーダルネットワークを考慮した輸送CO2排出量評価のためのecoMAの拡張

  三谷卓摩, 北垣亮馬, 野口貴文  土木学会年次学術講演会講演概要集(CD-ROM)  66th-  2011
• 都市の廃棄物をはかる (特集 都市をはかる)

  北垣 亮馬  Seeder : 種まく人 : 地球環境情報から考える地球の未来  (5)  36  -43  2011
• 産廃処理業におけるCO2削減ビジネスの展望 (特集 産廃処理とCO2削減)

  北垣 亮馬  いんだすと  25-  (12)  2  -11  2010/12
• 1153 Color appearance of graphic transcribed concrete

  NISHIO Yuhei, KITAGAKI Ryoma, HAYAO Hiroyuki, NOGUCHI Takafumi, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010-  (2010)  305  -306  2010/07/20
• 1289 Development of a method to make existing RC structures fragile, using the principle of induction heating

  LIM Myungkwan, AHN Jaecheol, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010-  (2010)  577  -578  2010/07/20
• 1290 Development of Trend Analysis Method for Electric Consumption in Ready-mixed Concrete Plant

  FUJIMOTO Satoshi, NOGUCHI Takafumi, OHKUBO Takaaki, KITAGAKI Ryoma, KANEMATSU Manabu, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010-  (2010)  579  -580  2010/07/20
• 1291 Reduction Effects of CO_2 Emission in Concrete Industry Using Admixtures

  KITAGAKI Ryoma, MITANI Takuma, NAGAI Hironori, NOGUCHI Takafumi, KANEMATSU Manabu, FUJIMOTO Satoshi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010-  (2010)  581  -582  2010/07/20
• 1547 Reduction Effects of CO_2 Emission in Concrete Industry Using Admixtures

  IWAMOTO Naohiro, KITAGAKI Ryoma, MITANI Takuma, NOGUCHI Takafumi, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010-  (2010)  1093  -1094  2010/07/20
• 8111 Extension of Simulation System ecoMA Employing Actual Road Network

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. F-1, Urban planning, building economics and housing problems  2010-  (2010)  1323  -1324  2010/07/20
• Investigation on construction wastes in Delhi and Katmandu

  北垣 亮馬  Reform  27-  (6)  72  -79  2010/06
• 分析 建設中に燃えた北京の超高層ビル TVCCは外断熱材の下階延焼で火災拡大

  北垣亮馬, 吉岡英樹, 野口貴文  日経アーキテクチュア別冊エコ事典  2010/05
• 117 Trend Analysis on Electric Consumption of Ready-mixed concrete plant

  FUJIMOTO Satoshi, NOGUCHI Takafumi, OHKUBO takaaki, FURUI Hiroshi, KITAGAKI Ryoma, KANEMATSU Manabu, NAGAI Hironori  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  33-  (33)  117  -117  2010/03
• 誘導加熱方式を利用した鉄筋コンクリート部材の解体性評価に関する研究

  林明寛, 野口貴文, 北垣亮馬  コンクリート工学年次論文集(CD-ROM)  32-  2010
• 産業廃棄物をとりまくCO2削減の全体概要論

  北垣亮馬  廃棄物資源循環学会研究討論会講演論文集  2010-  2010
• 香川県の廃コンクリートフローにおける環境負荷特性に関する研究

  竹田真梨子, 北垣亮馬, 堺孝司, 河村景史  コンクリート工学年次論文集(CD-ROM)  32-  2010
• LCI分析へのGISデータの利用による建設分野における最適地域環境戦略の探索

  兼松学, 野口貴文, 長井宏憲, 北垣亮馬, 藤本郷史  日本建設情報総合センター研究助成事業成果報告会資料集(CD-ROM)  8th-  2010
• Investigation on Construction Wastes in Delhi and Katmandu

  北垣 亮馬  Finex  22-  (131)  40  -47  2010
• Componential analysis of inorganic building material:Fundamental study for establishing total recycling system of building material

  Yamagishi Hideki, Yamada Kohei, Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi  Abstracts for ILCAJ meeting  2010-  (0)  118  -118  2010  

  現在無機建材のほとんどは供用期間を経たのち粉砕して最終処分されている。しかし、有限の資源を有効活用するためには全量リサイクルできるシステムを確立するのが望ましい。そのリサイクルの手法の一つとして、無機建材廃棄物の成分を適切に混合し成形、焼成などを行い再利用することが挙げられる。その適切な混合を定めるために、蛍光X線分析装置を利用し無機建材に含まれる成分を分析することを目的とする。
• CO2 emission & Cost-benefit Analysis at the Case of Replacing Refuse Incineration Plants with Compost Facilities as a Shrinking Strategy of Urban Restructuring

  KITAGAKI RYOMA, Chijiwa Nobuhiro, Ishikura Tomoki, Kawamoto Yoichi, Sakai Hiroshi, Kanamori Ryo, Ai Hisatoshi  Abstracts for ILCAJ meeting  2010-  (0)  159  -159  2010  

  日本国内の人口10～30万人の中堅都市は，ここ10年来毎年平均1%～3%程度の人口減少を続けている都市も少なくない．これらの都市は，近年，サービス施設の休廃止・統廃合といった公共サービスの提供エリアを選択的にすることで行政を効率化し，さらに，都市域の縮小化「縮退戦略」を進めることも視野にいれており，なるべく住民の満足度を維持しながら，都市運営の効率をあげる方法を検討している．そこで，本研究では，人口減少している都市の一つである群馬県とくに桐生市を対象に，ごみ処理焼却施設の休廃止をするかわりに，低コストで管理できるコンポスト施設を設置することによって得られる費用便益効果およびCO2排出量削減効果の比較を試みた．ごみ焼却サービスの提供範囲を狭めながらも，低コスト・低環境負荷の代替施設を設置することによって，都市全体のコストとCO2排出量を下げながらも，住民の満足度を下げず，都市としての運営効率をあげる可能性が確認された．
• Scenario evaluation for reducing the environmental load of concrete-related industry

  IWATA AYAKO, KANEMATSU MANABU, NOGUCHI TAKAFUMI, NAGAI HIRONORI, KITAGAKI RYOMA, FUJIMOTO SATOSHI  Abstracts for ILCAJ meeting  2010-  (0)  111  -111  2010  

  建設産業から発生する二酸化炭素や最終処分廃棄物といった環境負荷が全産業に占める割合は大きいことが知られている．そこで，建設産業の中でもコンクリート関連産業から排出される環境負荷を削減することを目的として，シナリオを設定し評価を行った．評価には，著者らグループが開発してきた資源循環シミュレーションシステムEcoMAを用いた．本報告ではこのシステムによるシナリオ評価の結果を示す．
• Evaluation of CO2 emission in Concrete Industry Using Resource Recycling Simulator ecoMA Implementing Alternate Modes

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi  Abstracts for ILCAJ meeting  2010-  (0)  117  -117  2010  

  個別のカーボンフットプリントだけでなく，コンクリート産業全体の現況再現や将来のCO2排出量や廃棄物量のフローを推定する手法として，資源循環シミュレータecoMAが提案されている．このecoMAでは，輸送距離を求める方法として,代表的な交通手段であるトラックによる道路輸送を想定した簡易計算を行っていた．しかしながら，国内においても長距離大量輸送では海上輸送が多く，CO2排出量の削減を考えれば鉄道輸送も魅力的であると考えられる．そこで，複数輸送手段を考慮できるようecoMAの拡張を行うことで，コンクリート産業のCO2排出量について精緻化を行った．さらに，距離を優先した場合とCO2排出量の削減を優先した場合でシナリオ別輸送CO2排出量を算出し，その比較分析を行った．
• Color appearance and making method of graphic transcribed color concrete

  Nishio Yuhei, Kitagaki Ryoma, Hayano Hiroyuki, Nagai Hironori, Noguchi Takafumi  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2010-  (0)  46  -46  2010  

  The purpose of this research aimed to develop the technology which steadily transcribes graphics on the surface of concrete without ruining graphics from the viewpoint of giving various functions to the surface of concrete. "graphic transcribed color concrete" is the technology which prints image on the surface of concrete by placing concrete in an attached sheet, consisting of cement etc where some inks are printed, behind the formwork. This is dealing with the results of evaluating the making method and color appearance.
• 建設中に燃えた北京の超高層ビルTVCC 外断熱材の下階延焼で火災拡大 (検証・火災事故 これでいいのか! 防火規制)

  北垣亮馬  日経アーキテクチュア  (912)  43  -50  2009/11/09
• 分析 建設中に燃えた北京の超高層ビル TVCCは外断熱材の下階延焼で火災拡大

  北垣亮馬, 吉岡英樹, 野口貴文  日経アーキテクチュア  11-  (19)  43  -49  2009/11
• 2005 Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Fomvng

  Tokihiko FUKAO, Ryoma KITAGAKI, Hironori NAGAI, Takafumi NOGUCHI, Dept. ofArch Graduate School of Eng. Univ. of Tokyo, Graduate School of Eng. Univ. of Tokyo, Dept of Arrh. Graduate School of Eng. Univ. of Tokyo, Dept. ofAtrh Graduate School of Eng Univ. of Tokyo  大会学術講演会研究発表論文集  2009-  (2009)  27  -30  2009/10/22
• 1101 Study on Mechanical Properties of Completely Recyclable Concrete of Aggregate-recovery Type Subjected to High Temperature Heating

  NAGAI Hironori, KUNIEDA Yoichiro, TSUJINO Masato, NOGUCHI Takafumi, KITAGAKI Ryoma  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009-  (2009)  201  -202  2009/07/20
• 1210 Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Forming

  FUKAO Tokihiko, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009-  (2009)  419  -420  2009/07/20
• 1579 Development of Cementitious Joint considering Design for Disassembly : Part1 Selection of Susceptor and Influence of Thickness on Heating Properties

  AHN Jaecheol, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi, KIM Yongkyoung  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009-  (2009)  1157  -1158  2009/07/20  

  Dept. of Arch., Graduate School of Eng., The Univ. of Tokyo
• 1580 Development of Cementitious Joint considering Design for Disassembly : Part2 Influence of Thickness on Heating Properties by Improvement of Susceptor

  AHN Jaecheol, LIM Myungkwan, KITAGAKI Ryoma, Noguchi Takafumi, KIM Yongkyoung, LEE Sungjin  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009-  (2009)  1159  -1160  2009/07/20
• 1592 Development of Resource Flow Simulation System of concrete related materials : Vol.8 Environmental impact assessment according to processing of concrete mass caused by demolition of buildings

  IWATA Ayako, KANEMATSU Manabu, NOGUCHI Takafumi, KITAGAKI Ryoma, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009-  (2009)  1183  -1184  2009/07/20
• マイクロ波加熱技術を利用した骨材回収型完全リサイクルコンクリートに関する研究(その1 概要および強度向上技術)

  辻埜真人, 北垣亮馬, 野口貴文, 長井宏憲  セメント技術大会講演要旨  63rd-  2009
• マイクロ波加熱技術を利用した骨材回収型完全リサイクルコンクリートに関する研究(その2 骨材回収性能)

  辻埜真人, 北垣亮馬, 野口貴文, 長井宏憲  セメント技術大会講演要旨  63rd-  2009
• Resource Flow Simulation of concrete related materials by ecoMA:Resource Flow Simulation System of concrete related materials (ecoMA)Evaluation of environmental load in the concrete-related industry considering slag and fly ash

  Yamagishi Hideki, Kitagaki Ryoma, Nagai Hironori, Noguchi Takahumi, Kanematsu Manabu, Hujimoto Satoshi  Abstracts for ILCAJ meeting  2009-  (0)  78  -78  2009  

  近年セクター別のCO2削減目標が定められ、コンクリート業界全体でのCO2削減努力が求められている。そこで特にセメント使用によるCO2排出量を削減するには、セメント代替材料を有効に使用することが求められている。しかし、混和材である高炉スラグやフライアッシュは他産業に依存する副産物であり、そのマテリアルフローは詳細には明らかにされてこなかった。そこで本研究では、高炉スラグ、フライアッシュのマテリアルフローをアンケート、統計から明らかにし、資源循環シミュレーターecoMAで関東のコンクリート関連工場、建設現場を再現し、コンクリート業界が混和材を大量使用することによるCO2排出削減量を定量的に評価した。
• Development of Simulation System for Calculating Regional CO2 emission of Building Materials Employing Actual Road Network

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Tkafumi, Fujimoto satoshi, Kanematsu Manabu  Abstracts for ILCAJ meeting  2009-  (0)  76  -76  2009  

  JEMAI, LIME，BEESなどの従来のLCAソフトでは，平均的な輸送距離を想定してCO2排出量が計算されてきた.しかしながら，実際の道路ネットワークによって算出されるCO2排出量は，地域によって輸送距離が大きく異なるものと考えられる．そこで，現実の道路ネットワークと既往の推計法の比較分析を行い，結果が異なることを示した．
• Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Forming

  Fukao Tokihiko, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2009-  (0)  5  -5  2009  

  In order to develop new eco-friendly building materials, authors tried making non-baked tile by densification of powders through carbonation and hydration after pressure forming. The studies on properties of casting calcium carbonate by same process have been already done by Arinaga. In this study, to make improvement of the casting calcium carbonate and apply the process to recycle by-product powder derived from used concrete, authors produced some kind of tile material experimentally and investigated the properties of them. In the result, authors presented the possible way to produce tile material by simple and energy saving process mainly using by-product powder which effective way of recycling is strongly hoped for.
• 1617 Development of Resource Flow Simulation System of concrete related materials : Vol. 7 Comparison of environmental impacts between Tokyo and Hokkaido

  KITAGAKI Ryoma, IWATA Ayako, KANEMATSU Manabu, NAGAI Hironori, FUJIMOTO Satoshi, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008-  (2008)  1233  -1234  2008/07/20
• 1227 Research on effect of power generation efficiency improvement of solar cell module using by thermal barrier and insulation coating including midair ceramic beads

  NAGAI Hironori, KITAGAKI Ryoma, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008-  (2008)  453  -454  2008/07/20
• 1616 Development of Resource Flow Simulation System of concrete related materials : Vol. 6 Evaluation of environmental load in the concrete-related industy considering regionality and scale charactaristics

  IWATA Ayako, NOGUCHI Takafumi, KANEAMTSU Manabu, KITAGAKI Ryoma, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008-  (2008)  1231  -1232  2008/07/20
• 1615 Development of Resource Flow Simulation System of concrete related materials : Vol. 5 Quantitative estimation of specific CO2 emission of the concrete-related industy

  NOGUCHI Takafumi, IWATA Ayako, KANEAMTSU Manabu, KITAGAKI Ryoma, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008-  (2008)  1229  -1230  2008/07/20
• 1576 Completely Recyclable Concrete of Aggregate-recovery Type by using Microwave Heating Technology

  TSUJINO Masato, KITAGAKI Ryoma, NOGUCHI Takafumi, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008-  (2008)  1151  -1152  2008/07/20
• 118 Environmental Evaluation of Dynamism in Production and Transportation of Concrete Related Materials : Using Resource-Flow Simulation System ecoMA

  FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori, KANEMATSU Manabu, NOGUCHI Takafumi  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  31-  (31)  118  -118  2008/03
• インドネシア・メダン市での建築ストック劣化調査および、ストック寿命にもとづくコンクリート需要予測評価

  北垣 亮馬  Finex  20-  (117)  22  -29  2008  

  インドネシアのメダン市は、北スマトラ州にあるインドネシア第三の都市である。本稿は、2007年1月8日〜22日に東京大学都市再生COEの活動の一環として、メダン市の建築ストックの性能劣化実態調査および現地生コンクリート製造企業に対して実施したヒアリング調査に基づき、一般的な建築ストック寿命から試算した場合の建設系資材(とくに、セメントとコンクリート系廃棄物)の需給バランスについてシミュレーションによる予測試算を実施し、これを報告するものである。現地建築ストック劣化調査については、(1)都心部のRCレンガ壁式住宅の新築について、材料・施工方法の観点から施工品質調査を実施し(2)都心部街区の一区画を選定し、建物群の劣化調査を実施した。その結果、発展途上国都心部の建築ストックによくみられる脆弱な構造のみならず、それ以前に、現地の気象の影響によって、通常はそれほど管理するのが高度ではない施工品質が要因となり、経年劣化・脆弱化していると考えられる箇所が頻繁に見られることが明らかになった。次に、現地の代表的な生コンクリート製造企業に対して、現地生コンの消費量および材料調達の方法、価格などについてヒアリングし、メダン市の人口増加状況から、今後のセメントの需要、建築ストック解体ラッシュのピーク時期とコンクリート系廃棄物について都市計画的観点からシミュレーションを実施し、考察を行った。今後数年間、現在のペースで成長を続けることによって、メダン市だけで、ピーク期には現在の東京都の約8.0倍程度のコンクリート系廃棄物が年間排出される勢いになると予測された。
• Calculation of specific environmental load consumption in concrete related industry considering the local communities

  Iwata Ayako, Kanematsu Manabu, Kitagaki ryoma, Nagai Hironori, Noguchi Takafumi  Abstracts for ILCAJ meeting  2008-  (0)  27  -27  2008  

  環境負荷評価を行う際，地域性や規模性を評価に組み入れるには，それらを考慮して算定された環境負荷原単位が必要である．特に建設産業などの地域性が強いとされている産業の評価において，そのような原単位を用いることは評価結果に影響を及ぼすと考えられる．そこで本研究では，2地域を対象に，コンクリート関連産業であるレディーミクストコンクリート工場・セメント工場・骨材工場を対象に実態調査を実施し，得られたデータから地域別・工場種別の環境負荷原単位を算定した．その結果，建設産業の原単位は地域性や工場の規模性の違いにより異なることが示された．
• Analysis on Specific Electric Consumption of Ready-mixed Conrete Plant

  Fujimoto Satoshi, Noguchi Takafumi, Kanematsu Manabu, Kitagaki Ryoma, Nagai Hironori, Furui Hiroshi  Abstracts for ILCAJ meeting  2008-  (0)  26  -26  2008  

  Construction industry is reported to consume over 40% of total energy consumption,and thus should not be neglected. Especially, concrete and its related materials are undoubtedly important for their mass.According to our previous studies using questionnaire method, energy basic unit for ready-mixed concrete is unaccountably in variety. Therefore, we have conducted a direct measuring method using clamp wattmeters. In this report, on-site feasibility study of wattmeters are conducted at a ready-mixed concrete plant in Hiroshima Pref.
• 打放しコンクリートのテクスチュアの視覚的評価 (特集 上手につくる打放しコンクリート) -- (打放しコンクリートの建築計画)

  野口 貴文, 北垣 亮馬  建築技術  (693)  98  -101  2007/10
• 1230 Development of Resource Flow Simulation System of concrete related materials : Vol.4 A Field Survey in Hokkaido Area and the Simulated Result

  NAGAI Hironori, FUJIMOTO Satoshi, KITAGAKI Ryoma, NOGUCHI Takafumi, KANEMATSU Manabu  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2007-  (2007)  475  -476  2007/07/31
• 1386 Proposal of Texture Composition Method for Building Cladding Materials

  FUJIMOTO Satoshi, KANEMATSU Manabu, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2007-  (2007)  787  -788  2007/07/31
• 1388 Study On Tattoo Concrete Process

  FUKAO Tokihiko, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takahumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2007-  (2007)  791  -792  2007/07/31
• 腐食形態が腐食鉄筋のひずみ硬化特性に及ぼす影響に関する研究

  金螢来, 野口貴文, 長井宏憲, 北垣亮馬  セメント技術大会講演要旨  61st-  2007
• GISを用いた静脈物流の資源循環支援システムのためのコンクリート系廃棄物発生量の予測とその輸送に関する調査研究

  野口貴文, 兼松学, 田村雅紀, 長井宏憲, 北垣亮馬, 藤本郷史, 藤本郷史  日本建設情報総合センター研究助成事業成果報告会資料集(CD-ROM)  5th-  2007
• Comparison of transporation distance using GIS in resource-flow between Tokyo and Hokkaido

  KITAGAKI RYOMA, KIWATA AYAKO, KANEMATSU MANABU, NAGAI HIRONORI, FUJIMOTO SATOSHI, NOGUCHI TAKAFUMI  Abstracts for ILCAJ meeting  2007-  (0)  64  -64  2007  

  GISを用いた道路距離算定手法によりコンクリート産業における工場間の道路輸送距離を算出し、直線距離との比較を行った。その結果、東京の直線距離に対する道路輸送距離の比率に比べて北海道の直線距離に対する道路輸送距離の比率が大きくなることが明らかにされたと同時に北海道は直線距離と道路距離の相関関係に東京に比べてばらつきがあることが確認された。このことから、建設工事で利用される再生材の調達判断基準として再生材生産工場までの直線距離を用いる場合、都市部においては有効であるが、郊外においては、必ずしも有効でなく道路距離を用いた方がよいことが示された。
• Resource-flow simulation in concrete related industries using ecoMA:Comparison of regional impacts between Tokyo and Hokkaido

  IWATA AYAKO, KITAGAKI RYOMA, KANEMATSU MANABU, NAGAI HIRONORI, FUJIMOTO SATOSHI, NOGUCHI TAKAFUMI  Abstracts for ILCAJ meeting  2007-  (0)  65  -65  2007  

  セメントは世界で水に次いでもっとも多く使用される材料でありこのことから、地域のコンクリート系産業に関連する工場は、二酸化炭素、廃棄物量の観点から大きな環境インパクトを持つと考えられる。そこで本研究では、資源循環シミュレーターecoMAを用いて、コンクリート系材料を取り扱う関連工場である生コン工場、セメント工場、砕石工場、中間処理工場、最終処分場を現実の所在地、生産規模などを実態調査に基づいて入力し、現況の地域事情を反映した上で北海道と東京の環境負荷量の算出と予測を行った。
• Study On Tattoo Concrete Process

  Fukao Tokihiko, Kitagaki Ryoma, Nagai Hironori, Noguchi Takahumi  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2007-  (0)  7  -7  2007  

  he authors have refined Tattoo Concrete Process and measured accuracy of printed image on the surface of concrete.
• 1233 3-Dimension Analysis on the Section and Surface Shape of a Corroded Reinforcement

  KIM Hyungrae, KITAGAKI Ryoma, FUJIMOTO Satoshi, NAGAI Hironori, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  1-  (2006)  485  -486  2006/07/31
• 1353 Development of Resource Flow Simulation System of concrete related materials : Vol. 1 Overview of the Research Project

  NOGUCHI Takafumi, KANEMATSU Manabu, FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2006-  (2006)  725  -726  2006/07/31
• 1354 Development of Resource Flow Simulation System of concrete related materials : Vol. 2 Overview of the Interview and Literature Research

  KANEMATSU Manabu, FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2006-  (2006)  727  -728  2006/07/31
• 1355 Development of Resource Flow Simulation System of concrete related materials : Vol. 3 Design of the System and Simulation Case Study on Recycled Aggregate

  FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2006-  (2006)  729  -730  2006/07/31
• 40110 Basic Research On Physiological Information Changes Reflected by Visual Information

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. D-1, Environmental engineering I, Room acoustics and acoustic environment noise and solidborne sound environmental vibration light and color water supply and drainage water environment urban installation and environmental management environmental psychology and physiology environmental design electro-magnetic environment  2006-  (2006)  233  -234  2006/07/31
• Effect of Business Custom of Concrete Industry on Transport Environmental Impact : Simulated Evaluation using Multi-Agent-System

  FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori, KANEMATSU Manabu, NOGUCHI Takafumi  Proceedings of the Annual Meeting of Japan Society of Energy and Resources  25-  63  -66  2006/06/08
• 生コンクリート製造業における商習慣の輸送環境負荷への影響-マルチエージェントシステムに基づく資源循環シミュレーションを用いて-

  藤本郷史, 藤本郷史, 北垣亮馬, 長井宏憲, 兼松学, 野口貴文  エネルギー・資源学会研究発表会講演論文集  25th-  2006
• Prediction of Concrete-materials Related Waste: Resource-flow Simulation using Multi-agent-system

  FUJIMOTO Satoshi, KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi, MAMIYA Takashi, SUZUKI Koichi  Journal of Life Cycle Assessment, Japan  2-  (3)  222  -228  2006  

  Reduction of CO₂ emission is one of the most important tasks for the construction industries in many countries, since they cover high ratio in the total emission. On the other hand, reduction of waste emission is another important task for the construction industries in highly populated countries, such as Japan, because of the depletion of landfill sites. Among the whole construction industries, concrete is the most widely and long-term used material. Some of the researchers has qualitatively pointed out that the amount of demolished concrete, especially those used in 1970s, is expected to cause a severe damage on the depletion of landfill sites. To solve the problem, there have been many technical and social proposals. In this paper, to find an optimal material balance and social circumstances for the proposal, we have firstly developed a resource-flow simulation system using the concept of Multi-Agent-System. Secondly, using the system, comparative case studies have been made to examine two typical and prospective proposals; high quality recycled aggregate, and enlargement of building lifetime. The studies have shown that even in the idealistic situation where recycled aggregate is aggressively used despite of its high price, the predicted amount of demolished concrete is overwhelming. The studies have also shown that in the idealistic situation where building lifetime is unrealistically long, the amount of demolished concrete can be reduce on some level.
• 1631 Evaluation on "Eco-material" of Wooden Materials

  Ryoma KITAGAKI, Manabu KANEMATSU, Takafumi NOGUCHI, Dept. of Architecture Faculty of Engineering University of Tokyo, Dept. of Architecture Faculty of Engineering University of Tokyo, Dept. of Architecture Faculty of Engineering University of Tokyo  大会学術講演会研究発表論文集  2005-  (2005)  131  -134  2005/10/20
• 1511 Development of Long-Term Resource Flow Management System focused on Concrete Related materials

  Fujimoto Satoshi, Kitagaki Ryoma, Kanematsu Manabu, Noguchi Takafumi, Mamiya Takashi, Suzuki Koichi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2005-  (2005)  1021  -1022  2005/07/31
• 1498 Environmental Performance Measurement of Wooden Materials called "Eco Material"

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2005-  (2005)  995  -996  2005/07/31
• Evaluation on Eco-material of Wooden Materials

  Kitagaki Ryoma, Kanematsu Manabu, Noguchi Takafumi  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2005-  (0)  31  -31  2005  

  Eco-labeling systems to products,which have an advantage of environmentall aspects,are very effective to spread and make them known for uuse.However,many eco-labels have not been established on numerical standards,and so it is very difficult to select an appropriate product from all kinds of eco-materials.We have investigated faxtories of wooden building materials with eco-labels in Japan,and evaluated LCCO2,LCW of each material.As a result,LCCO2 and LCW of materials with the same eco-label are not necessarily similar with each other,therefore,the numerical evaluation methods for eco-materials are required in the near future.
• Prediction of concrete-materials related waste :resource-flow simulation using multi-agent-system

  Fujimoto Satoshi, Kitagaki Ryoma, Kanematsu Manabu, Noguchi Takafumi, Mamiya Takashi, Suzuki Koichi  Abstracts for ILCAJ meeting  2005-  (0)  23  -23  2005  

  CO2・廃棄物削減への社会的要請を背景として、コンクリート材料分野では再生骨材に代表される多様なリサイクル技術が提案されてきた。本研究では、これら新技術の普及に必要な社会状況や最適資源循環フローの導出を目的として、マルチエージェントシステム手法による資源循環シミュレーションシステムを開発した。本システムを用いて、2055年までの東京地区を対象とし、コンクリート関連材料の廃棄物動向予測を行った。
• 1389 Basic Study on Evaluation of Optical Features of Building Material Surfaces

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2004-  (2004)  803  -804  2004/07/31
• フルカラーデジタル画像解析による建築外装材表面性状の定量把握に関する基礎的研究(優秀修士論文奨励賞)(<特集>日本建築仕上学会学会賞・奨励賞受賞者紹介)

  北垣 亮馬  Finex  16-  (94)  39  -39  2004
• 1023 Basic Research on Evaluation of Surface Features of Building Claddings including Full Color Infomation by Using 2Dimensional Fourier Transformation

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2003-  (2003)  45  -46  2003/07/30
• _

  FURUICHI Hiroshi, KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2003-  (2003)  47  -48  2003/07/30
• Basic Study on Visual Assessment for Wall Stain with 2 Dimension fourie Trancformation

  KITAGAKI Ryoma, KANEMATSU Manabu, NOGUCHI Takafumi, Tomosawa FUMINORI  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2000-  (2000)  321  -322  2000/07/31
• 2次元フーリエ変換によるコンクリートの汚れの評価手法に関する基礎的研究

  兼松学, 北垣亮馬, 野口貴文, 友沢史紀  コンクリート工学年次論文集  22-  (1)  2000

Presentations

• 発泡プラスチック系断熱材の水分による劣化の分析手法 (日本建築仕上学会2020年大会発表論文(その2)性能評価セッション)

  任 裕彬, 北垣 亮馬

  リフォーム  2020/12  テツアドー出版
  
• 無機-有機界面接着部分の劣化メカニズムの把握 (日本建築仕上学会2020年大会発表論文(その2)性能評価セッション)

  小島 静, 北垣 亮馬

  リフォーム  2020/12  テツアドー出版
  
• AFMによるコンクリートの遷移帯部分の弾性率の評価

  橋本 拓実, 北垣 亮馬

  日本建築学会北海道支部研究報告集  2020/06  日本建築学会
  
• 外断熱改修後39年が経過したRC造建築物の耐久性に関する調査

  足立 裕介, 谷口 円, 平川 秀樹, 小浦 孝次, 北垣 亮馬, 駒木根 洋一, 佐藤 潤平, 松井 為人, 吉野 利幸

  日本建築学会北海道支部研究報告集  2020/06  日本建築学会
  
• ケイ酸リチウム系補修材の補修メカニズムに関する基礎的研究

  徳廣 美沙, 北垣 亮馬

  日本建築学会北海道支部研究報告集  2020/06  日本建築学会
  
• A new quality framework of recycled concrete aggregate utilized for several geotechnical purposes in Japan

  Kitagaki R, Nagai F, Hosonuma A, Takahashi H

  the 3rd ACF Symposium on Assessment and Intervention of Existing Structures
• The effect of sealing conditions and freeze-thaw on mortar pore structure

  Ma D, Azuma Y, Kitagaki Y, Senbu O, Morinaga Y

  the 3rd ACF Symposium on Assessment and Intervention of Existing Structures
• Salt-preventive property of several types of lithium silicate-based surface penetrants and its enhancing effect by calcium-based solution

  Taniguchi M, Kitagaki R

  the 3rd ACF Symposium on Assessment and Intervention of Existing Structures
• Carbonation suppression effects of various finishing materials installed on a model building exposed in 30 years

  Yoneya S, Senbu O, Kitagaki R, Nemoto K

  the 3rd ACF Symposium on Assessment and Intervention of Existing Structures
• Environmental effects of pervious concrete pavements in Shanghai and Nanjing - Case studies by logistics simulation

  Ryoma Kitagaki

  73rd RILEMWEEK 2019, International Conference on Innovative Materials for Sustainable Civil Engineering
• 23102 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の逆対称加力 その1 せん断試験体の実験計画

  師橋 憲貴, 長橋 璃久, 北垣 亮馬, 小川 敦久

  構造IV  2019/07  日本建築学会
  
• 23103 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の逆対称加力 その2 材令6週時におけるせん断性状

  長橋 璃久, 師橋 憲貴, 北垣 亮馬, 小川 敦久

  構造IV  2019/07  日本建築学会
  
• 23104 低品質再生骨材コンクリートを用いた場所打ちコンクリート杭の中心圧縮加力 その1 材齢5週時における圧縮性状

  秋間 大志, 師橋 憲貴, 北垣 亮馬, 小川 敦久

  構造IV  2019/07  日本建築学会
  
• 1386 水酸化カルシウムコロイド溶液を用いた補修工法がモルタル表面に及ぼす影響

  米谷 怜, 北垣 亮馬, 谷藤 貴生

  材料施工  2019/07  日本建築学会
  
• 1656 クリア塗膜と有色塗膜の間での紫外線劣化シナリオの本質的差異

  北垣 亮馬, 石田 崇人

  材料施工  2019/07  日本建築学会
  
• 1657 建築用ウレタンコンポジット塗膜の熱劣化によるモルフォロジーの変化メカニズム

  谷藤 貴生, 北垣 亮馬

  材料施工  2019/07  日本建築学会
  
• New quality management codes for low quality recycled aggregate named "Tokyo brand ‘Cool eco-Stone’", extending applicability for several soil/ground materials

  Ryoma Kitagaki, Fumio Nagai, Akito Hosonuma, Hitoshi Takahashi

  Session by Environmentally Sound Management of Construction and Demolition Waste (CDW):Challenges and Opportunities in Asian Countries, CECAR8
• Health monitoring of tile structures via non-contact laser excitation/measurement technique

  SUZUKI Kengo, SASAKI Motoaki, SAITO Ryosuke, KITAGAKI Ryoma, KAJIWARA Itsuro

  The Proceedings of Mechanical Engineering Congress, Japan  2019  The Japan Society of Mechanical Engineers
   

  In this research, we propose a method to evaluate the adhesion of exterior tiles based on non-contact laser excitation/measurement technology using laser-induced plasma. In this method, laser ablation is used for excitation, and a laser Doppler vibrometer is used for measurement. A test specimen including tiles with insufficient adhesion is manufactured and evaluated. As a result of the laser excitation experiments, we found that the power spectrum increased in a specific frequency band at the floating part compared with the sound part. Furthermore, RT method was applied to the measurement data, resulting in a quantitative extraction of characteristic change due to the insufficient adhesion of the tiles.

• Real Estate Evaluation on Thermal Diffusivity with IoT Sensors

  Yuan Lin, Yuki Obuchi, Xueting Wang, Toshihiko Yamasaki, Ryoma Kitagaki, Satoshi Toriumi, Mikihisa Hayashi, Ai Sakai, Nobuhito Haga, Shimpei Nomura, Yoichi Ikemoto

  2019 IEEE 8th Global Conference on Consumer Electronics (GCCE)
• The Repairing Effects of Lithium Silicate Based Material to the Surface of Hardened Concrete

  Nguyen Xuan Tung, Ryoma KitagakiYoshiro Yamakita

  Proceedings of the 5th International Conference on Geotechnics
• 23034 低品質再生骨材コンクリート梁部材の付着割裂強度 その2 材齢1年時の乾燥収縮性状

  日野 優輝, 師橋 憲貴, 小川 敦久, 北垣 亮馬

  構造IV  2018/07  日本建築学会
  
• 23035 低品質再生骨材コンクリート梁部材の付着割裂強度 その3 材齢1年時のひび割れ性状

  師橋 憲貴, 日野 優輝, 小川 敦久, 北垣 亮馬

  構造IV  2018/07  日本建築学会
  
• 1166 解体工事における構造種類別・工程別の歩掛・平米作業単価と規模効果に関する調査

  金 志訓, 北垣 亮馬, 石田 崇人

  材料施工  2018/07  日本建築学会
  
• 1573 ニューヨーク市および台北市の外壁落下リスク対策の制度比較

  秦 賢治, 北垣 亮馬, 橘高 義典, 田村 雅紀, 堀 竹市, 渡辺 清彦

  材料施工  2018/07  日本建築学会
  
• 1667 ポリウレタン樹脂系塗膜の濡れ性に対する顔料濃度の影響

  石田 崇人, 北垣 亮馬

  材料施工  2018/07  日本建築学会
  
• Temperature dependency of photodegradation reactions and elastic modulus change by soft-segment modification on urethane-based coatings for building use

  Takato Ishida, Ryoma KITAGAKI

  the 10th International Conference of Modification, Degradation and Stabilization of Polymers
• Apparent viscoelasticity of extruded polystyrene foam(xps) and defoamed xps around melting point

  Ryoma KITAGAKI, Takehiko ARAI, Takato ISHIDA

  the 10th International Conference of Modification, Degradation and Stabilization of Polymers
• A Model for apparent viscoelasticity of remelted extruded polystyrene foam(XPS) around melting point

  Ryoma KITAGAKI, Takehiko ARAI, Takato ISHIDA

  67th Symposium on Macromolecules
• Vapor diffusion coefficient and water absorption coefficient of mortar surfaces repaired with colloidal calcium hydroxide solution and TEOS and its change caused by accelerated carbonation

  Ryoma KITAGAKI, Jihoon Kim

  International Conference on Sustainability in Civil Engineering (ICSCE)
• Comparison of Quantitative Evaluation between Purchase and Rental Housing Market Using Hedonic Approach considering the Effect of Multiple Collinearity - Case Study in Tama Newtown Tokyo

  Ryoma KITAGAKI, Yukiko KATAGIRI

  Applied Regional Science Conference Annual Meeting
• 1584 光熱同時劣化を受ける建材用塗膜の劣化反応メカニズムの温度依存性

  石田 崇人, 北垣 亮馬

  材料施工  2017/07  日本建築学会
  
• The chemical changes of cement paste with silicate-based surface penetrants

  Ji hoon Kim, Ryoma Kitagaki

  Asian Concrete Federation
• 1535 Effect of moisture in peeling of glued laminated timber

  MATSUMOTO Yumi, NOGUCHI Takafumi, KITAGAKI Ryoma

  Summaries of technical papers of annual meeting  2015/09  Architectural Institute of Japan
  
• 1453 Measurement of gas permeability coefficients and diffusion coefficients of coatings using TDS

  MIURA Risa, KITAGAKI Ryoma

  Summaries of technical papers of annual meeting  2015/09  Architectural Institute of Japan
  
• 1583 Measurement of CO2 and Cl in cement paste using TPD

  NAKAGIRI Takahiro, KITAGAKI Ryoma, MIYABAYASHI Nobuyoshi

  Summaries of technical papers of annual meeting  2014/09  Architectural Institute of Japan
  
• 1539 Comprehensive analysis on deterioration of coating material exposed to accelerated UV

  MATSUMOTO Yumi, NOGUCHI Takafumi, KITAGAKI Ryoma, KANAYA Hitomi

  Summaries of technical papers of annual meeting  2014/09  Architectural Institute of Japan
  
• 1406 Humidity dependency of longitudinal tensile creep of wood

  Kamamura Chihiro, Kitagaki Ryoma

  Summaries of technical papers of annual meeting  2014/09  Architectural Institute of Japan
  
• 1197 Basic Study on the Chloride Permeability of Concrete Structure Caused by Tsunami pressure

  SUZUKI Ayaka, KITAGAKI Ryoma

  Summaries of technical papers of annual meeting  2014/09  Architectural Institute of Japan
  
• 41028 Incident angle dependence on heat transportation including solar radiation of material surface

  Kumada Kento, Kitagaki Ryoma

  Summaries of technical papers of annual meeting  2014/09  Architectural Institute of Japan
  
• Creep behavior of expansive concrete

  Hyeonggil CHOI, Myungkwan LIM, Takafumi NOGUCHI, Ryoma KITAGAKI

  Proceedings of ICMMA 2014 (The 8th international conference on multi-functinal materials and applications)
• 1697 Characterization of cement produced from inorganic construction waste

  OH Dayoung, NOGUCHI Takafumi, KITAGAKI Ryoma

  Summaries of technical papers of annual meeting  2013/08  Architectural Institute of Japan
  
• 1493 Loose Scale Control Using Water Based Acrylic Rubber with Sodium Nitrite Added

  ISHITSUKA Takao, FUKUYAMA Tomoko, KITAGAKI Ryoma, NOGUCHI Takafumi, SASAKI Yoshihiko

  Summaries of technical papers of annual meeting  2013/08  Architectural Institute of Japan
  
• 1491 Thermal insulating properties of a curtain coated by thermal barrier coating including voided ceramic beads

  YAEGASHI Ryo, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2013/08  Architectural Institute of Japan
  
• 1245 The Influence of the Coarse Aggregate with Surface Modification Treatment on the Mechanical Properties of Concrete

  CHOI Heesup, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2013/08  Architectural Institute of Japan
  
• D-01 A Study on the Performance Improvement of Surface Modification Concrete using Low-quality Crushed Aggregate

  CHOI Heesup, KITAGAKI Ryoma, NOGUCHI Takafumi

  日本建築学会東北支部研究報告集. 構造系  2013/06  Architectural Institute of Japan
  
• FUNDAMENTAL STUDY ON RECYCLING OF LOW-QUALITY RECYCLED FINE AGGREGATE USING CARBONATED NANOBUBBLE WATER

  Hansic Kim, Ryoma Kitagaki

  First International Conferernce on Concrete Sustainability
• Feasible improving techniques on concrete using recycling aggregate and byproduct powder with low environmental emission

  Ryoma Kitagaki

  First International Conferernce on Concrete Sustainability
• 1600 Development of a method to make existing RC structures fragile : using the principle of induction heating

  LIM Myungkwan, SHIN Sangheon, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1547 Evaluation method for energy saving effect of insulations and exterior materials in a building's service life coupled with carbon footprint

  Kitagaki Ryoma, Noguchi Takafumi, Yamagishi Hideki

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1541 Synthesis of Multi-Agent System Based on the Evolutionary Method And Its Applications to the Field of Concrete Industry

  Oh Dayoung, Yamagishi Hideki, Kitagaki Ryoma, Noguchi Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1539 Study on Precipitation of Calcium Carbonate in Concrete Pore Solution

  KIM Hansic, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1498 Thermal insulating properties depending on surface characterization of thermal barrier/insulating coatings

  YAEGASHI Ryo, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1372 Evaluation of Restrained Shrinkage Properties of Expansive Mortar in Early Ages

  CHOI Hyeonggil, TSUJINO Masato, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1328 Quality control system in curing concrete using small integrated circuit on formworks : part 2. Wireless networking system for collecting and visualizing distribution of compressive strength on concrete.

  Yamamoto Hideyuki, KITAGAKI Ryoma, Noguchi Takafumi, Nishijima Shigeyuki

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1327 Quality control system in curing concrete using small integrated circuit on formworks : part 1. Capacitance sensor system for automatic measurement and compressive strength estimation

  Nishijima Shigeyuki, Noguchi Takafumi, Kitagaki Ryoma, Yamamoto Hideyuki

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1124 A Study on the Influence of Surface Property upon the Color of Exposed Concrete

  FUKAO Tokihiko, SATO Sachie, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1008 Electrochemical Corrosion Control Mechanism of Water-based Acrylic Rubber

  ISHITSUKA Takao, FUKUYAMA Tomoko, KITAGAKI Ryoma, NOGUCHI Takafumi, SASAKI Yoshihiko

  Summaries of technical papers of annual meeting  2012/09  Architectural Institute of Japan
  
• 1026 炭酸ナノバブル水を用いた低品質再生細骨材の再資源化に関する基礎的研究

  金 翰〓, 北垣 亮馬, 野口 貴文

  日本建築学会関東支部研究報告集  2012/01  日本建築学会
  
• Sectioral & spatial analysis of co2 emission in concrete industry using resource recycling simulator “ecoma” implementing actual road network

  Takuma Mitani, Ryoma Kitagaki, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Urbanization
• Behavior of sectoral CO2 emission in concrete industry at the case of replacing ready-mixed concrete demands to pre cast concrete products

  Ryoma Kitagaki, Takuma Mitani, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Urbanization
• Equilibrium point of CO2 emission and material reusability in concrete industry at the case of replacing ready-mixed concrete demands to pre cast concrete products

  Ryoma Kitagaki, Takuma Mitani, Hironori Nagai, Takafumi Noguchi

  2nd International Conference on Waste Engineering and Management
• Resource-flow simulation in concrete-related industries using ecoMA -Environmental evaluation of concrete-related industries including mixture material-

  Hideki Yamagishi, Ryoma Kitagaki, Takuma Mitani, Hironori Nagai, Takafumi Noguchi

  2nd International Conference on Waste Engineering and Management
• 8111 Extension of Simulation System ecoMA Employing Actual Road Network

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. F-1, Urban planning, building economics and housing problems  2010/07  Architectural Institute of Japan
  
• 1547 Reduction Effects of CO_2 Emission in Concrete Industry Using Admixtures

  IWAMOTO Naohiro, KITAGAKI Ryoma, MITANI Takuma, NOGUCHI Takafumi, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010/07  Architectural Institute of Japan
  
• 1291 Reduction Effects of CO_2 Emission in Concrete Industry Using Admixtures

  KITAGAKI Ryoma, MITANI Takuma, NAGAI Hironori, NOGUCHI Takafumi, KANEMATSU Manabu, FUJIMOTO Satoshi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010/07  Architectural Institute of Japan
  
• 1290 Development of Trend Analysis Method for Electric Consumption in Ready-mixed Concrete Plant

  FUJIMOTO Satoshi, NOGUCHI Takafumi, OHKUBO Takaaki, KITAGAKI Ryoma, KANEMATSU Manabu, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010/07  Architectural Institute of Japan
  
• 1289 Development of a method to make existing RC structures fragile, using the principle of induction heating

  LIM Myungkwan, AHN Jaecheol, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010/07  Architectural Institute of Japan
  
• 1153 Color appearance of graphic transcribed concrete

  NISHIO Yuhei, KITAGAKI Ryoma, HAYAO Hiroyuki, NOGUCHI Takafumi, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2010/07  Architectural Institute of Japan
  
• Completely Recyclable Concrete of Aggregate-recovery Type by Using Microwave Heating

  Ryoma Kitagaki, Masato Tsujino, Hironori Nagai, Takafumi Noguchi

  the 11th international conference on advance in concrete technology and sustainable development
• Strategy to reduce CO2 in concrete industry

  Ryoma KITAGAKI

  Green City Group, the 1st Korea-China-Japan Young Researchers Workshop
• 117 Trend Analysis on Electric Consumption of Ready-mixed concrete plant

  FUJIMOTO Satoshi, NOGUCHI Takafumi, OHKUBO takaaki, FURUI Hiroshi, KITAGAKI Ryoma, KANEMATSU Manabu, NAGAI Hironori

  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  2010/03  Architectural Institute of Japan
  
• Development of Eco-Friendly Building Material by Densification of Powders through Carbonation and Hydration after Pressure Forming

  Tokihiko Fukao, Ryoma Kitagaki, Hironori Nagai, Takafumi Noguchi

  International Conference on Sustainable Building Asia, Ansan, Korea
• Color appearance and making method of graphic transcribed color concrete

  Nishio Yuhei, Kitagaki Ryoma, Hayano Hiroyuki, Nagai Hironori, Noguchi Takafumi

  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2010  Japan Society for Finishings Technology
   

  The purpose of this research aimed to develop the technology which steadily transcribes graphics on the surface of concrete without ruining graphics from the viewpoint of giving various functions to the surface of concrete. "graphic transcribed color concrete" is the technology which prints image on the surface of concrete by placing concrete in an attached sheet, consisting of cement etc where some inks are printed, behind the formwork. This is dealing with the results of evaluating the making method and color appearance.
• Evaluation of CO2 emission in Concrete Industry Using Resource Recycling Simulator ecoMA Implementing Alternate Modes

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi

  Abstracts for ILCAJ meeting  2010  The Institute of Life Cycle Assessment, Japan
   

  個別のカーボンフットプリントだけでなく，コンクリート産業全体の現況再現や将来のCO2排出量や廃棄物量のフローを推定する手法として，資源循環シミュレータecoMAが提案されている．このecoMAでは，輸送距離を求める方法として,代表的な交通手段であるトラックによる道路輸送を想定した簡易計算を行っていた．しかしながら，国内においても長距離大量輸送では海上輸送が多く，CO2排出量の削減を考えれば鉄道輸送も魅力的であると考えられる．そこで，複数輸送手段を考慮できるようecoMAの拡張を行うことで，コンクリート産業のCO2排出量について精緻化を行った．さらに，距離を優先した場合とCO2排出量の削減を優先した場合でシナリオ別輸送CO2排出量を算出し，その比較分析を行った．
• Scenario evaluation for reducing the environmental load of concrete-related industry

  IWATA AYAKO, KANEMATSU MANABU, NOGUCHI TAKAFUMI, NAGAI HIRONORI, KITAGAKI RYOMA, FUJIMOTO SATOSHI

  Abstracts for ILCAJ meeting  2010  The Institute of Life Cycle Assessment, Japan
   

  建設産業から発生する二酸化炭素や最終処分廃棄物といった環境負荷が全産業に占める割合は大きいことが知られている．そこで，建設産業の中でもコンクリート関連産業から排出される環境負荷を削減することを目的として，シナリオを設定し評価を行った．評価には，著者らグループが開発してきた資源循環シミュレーションシステムEcoMAを用いた．本報告ではこのシステムによるシナリオ評価の結果を示す．
• CO2 emission & Cost-benefit Analysis at the Case of Replacing Refuse Incineration Plants with Compost Facilities as a Shrinking Strategy of Urban Restructuring

  KITAGAKI RYOMA, Chijiwa Nobuhiro, Ishikura Tomoki, Kawamoto Yoichi, Sakai Hiroshi, Kanamori Ryo, Ai Hisatoshi

  Abstracts for ILCAJ meeting  2010  The Institute of Life Cycle Assessment, Japan
   

  日本国内の人口10～30万人の中堅都市は，ここ10年来毎年平均1%～3%程度の人口減少を続けている都市も少なくない．これらの都市は，近年，サービス施設の休廃止・統廃合といった公共サービスの提供エリアを選択的にすることで行政を効率化し，さらに，都市域の縮小化「縮退戦略」を進めることも視野にいれており，なるべく住民の満足度を維持しながら，都市運営の効率をあげる方法を検討している．そこで，本研究では，人口減少している都市の一つである群馬県とくに桐生市を対象に，ごみ処理焼却施設の休廃止をするかわりに，低コストで管理できるコンポスト施設を設置することによって得られる費用便益効果およびCO2排出量削減効果の比較を試みた．ごみ焼却サービスの提供範囲を狭めながらも，低コスト・低環境負荷の代替施設を設置することによって，都市全体のコストとCO2排出量を下げながらも，住民の満足度を下げず，都市としての運営効率をあげる可能性が確認された．
• Componential analysis of inorganic building material:Fundamental study for establishing total recycling system of building material

  Yamagishi Hideki, Yamada Kohei, Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi

  Abstracts for ILCAJ meeting  2010  The Institute of Life Cycle Assessment, Japan
   

  現在無機建材のほとんどは供用期間を経たのち粉砕して最終処分されている。しかし、有限の資源を有効活用するためには全量リサイクルできるシステムを確立するのが望ましい。そのリサイクルの手法の一つとして、無機建材廃棄物の成分を適切に混合し成形、焼成などを行い再利用することが挙げられる。その適切な混合を定めるために、蛍光X線分析装置を利用し無機建材に含まれる成分を分析することを目的とする。
• Simulation System for Calculating Regional CO2 emission of Building Materials Employing Actual Road Distance Calculator

  Takuma MITANI, Ryoma KITAGAKI, Hironori NAGAI, Takafumi NOGUCHI, Satoshi FUJIMOTO, Manabu KANEMATSU

  SB Seoul 2010
• Simulation System for Calculating Regional CO2 Emission Employing Micro Economics Model

  Ryoma KITAGAKI, Takuma MITANI, Hironori NAGAI, Takafumi NOGUCHI, Satoshi FUJIMOTO, Manabu KANEMATSU

  SB Seoul 2010
• Completely Recyclable Concrete of Aggregate-recovery Type by Using Microwave Heating Technology  [Invited]

  Takafumi Noguchi, Ryoma Kitagaki, Hironori Nagai, Masato Tsujino

  Proceedings of RILEM Symposium on Progress of Recycling in the Built Environment, Sao Paolo, Brazil
• Evacuation Simulation by Multi-agent System

  Ryoma Kitagaki

  China-Japan Seminar on Fire Safety Science and Engineering, Hefei, China
• 2005 Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Fomvng

  Tokihiko FUKAO, Ryoma KITAGAKI, Hironori NAGAI, Takafumi NOGUCHI, Dept. ofArch Graduate School of Eng. Univ. of Tokyo, Graduate School of Eng. Univ. of Tokyo, Dept of Arrh. Graduate School of Eng. Univ. of Tokyo, Dept. ofAtrh Graduate School of Eng Univ. of Tokyo

  大会学術講演会研究発表論文集  2009/10
• Regional Evacuation Simulation by ecoMA, a Multi-agent system

  Ryoma Kitagaki

  The 1st China-Japan Research Exchanging Conference on Fire Safety and Material Engineering, Beijing, China
• 1592 Development of Resource Flow Simulation System of concrete related materials : Vol.8 Environmental impact assessment according to processing of concrete mass caused by demolition of buildings

  IWATA Ayako, KANEMATSU Manabu, NOGUCHI Takafumi, KITAGAKI Ryoma, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009/07  Architectural Institute of Japan
  
• 1580 Development of Cementitious Joint considering Design for Disassembly : Part2 Influence of Thickness on Heating Properties by Improvement of Susceptor

  AHN Jaecheol, LIM Myungkwan, KITAGAKI Ryoma, Noguchi Takafumi, KIM Yongkyoung, LEE Sungjin

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009/07  Architectural Institute of Japan
  
• 1579 Development of Cementitious Joint considering Design for Disassembly : Part1 Selection of Susceptor and Influence of Thickness on Heating Properties

  AHN Jaecheol, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi, KIM Yongkyoung

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009/07  Architectural Institute of Japan
   

  Dept. of Arch., Graduate School of Eng., The Univ. of Tokyo
• 1210 Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Forming

  FUKAO Tokihiko, KITAGAKI Ryoma, NAGAI Hironori, NOGUCHI Takafumi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009/07  Architectural Institute of Japan
  
• 1101 Study on Mechanical Properties of Completely Recyclable Concrete of Aggregate-recovery Type Subjected to High Temperature Heating

  NAGAI Hironori, KUNIEDA Yoichiro, TSUJINO Masato, NOGUCHI Takafumi, KITAGAKI Ryoma

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2009/07  Architectural Institute of Japan
  
• Completely Recyclable Concrete of Aggregate-recovery Type by Using Microwave Heating

  Ryoma Kitagaki, Masato Tsujino, Takafumi Noguchi, Hironori Nagai

  fib 2009 Symposium on 21st Century Superhero, London, UK
• Development of Eco-Friendly Building Materials by Densification of Powders through Carbonation and Hydration after Pressure Forming

  Fukao Tokihiko, Kitagaki Ryoma, Nagai Hironori, Noguchi Takafumi

  Summaries of Technical Papers of Annual Meeting Japan Society for Finishings Technology  2009  Japan Society for Finishings Technology
   

  In order to develop new eco-friendly building materials, authors tried making non-baked tile by densification of powders through carbonation and hydration after pressure forming. The studies on properties of casting calcium carbonate by same process have been already done by Arinaga. In this study, to make improvement of the casting calcium carbonate and apply the process to recycle by-product powder derived from used concrete, authors produced some kind of tile material experimentally and investigated the properties of them. In the result, authors presented the possible way to produce tile material by simple and energy saving process mainly using by-product powder which effective way of recycling is strongly hoped for.
• Development of Simulation System for Calculating Regional CO2 emission of Building Materials Employing Actual Road Network

  Mitani Takuma, Kitagaki Ryoma, Nagai Hironori, Noguchi Tkafumi, Fujimoto satoshi, Kanematsu Manabu

  Abstracts for ILCAJ meeting  2009  The Institute of Life Cycle Assessment, Japan
   

  JEMAI, LIME，BEESなどの従来のLCAソフトでは，平均的な輸送距離を想定してCO2排出量が計算されてきた.しかしながら，実際の道路ネットワークによって算出されるCO2排出量は，地域によって輸送距離が大きく異なるものと考えられる．そこで，現実の道路ネットワークと既往の推計法の比較分析を行い，結果が異なることを示した．
• Resource Flow Simulation of concrete related materials by ecoMA:Resource Flow Simulation System of concrete related materials (ecoMA)Evaluation of environmental load in the concrete-related industry considering slag and fly ash

  Yamagishi Hideki, Kitagaki Ryoma, Nagai Hironori, Noguchi Takahumi, Kanematsu Manabu, Hujimoto Satoshi

  Abstracts for ILCAJ meeting  2009  The Institute of Life Cycle Assessment, Japan
   

  近年セクター別のCO2削減目標が定められ、コンクリート業界全体でのCO2削減努力が求められている。そこで特にセメント使用によるCO2排出量を削減するには、セメント代替材料を有効に使用することが求められている。しかし、混和材である高炉スラグやフライアッシュは他産業に依存する副産物であり、そのマテリアルフローは詳細には明らかにされてこなかった。そこで本研究では、高炉スラグ、フライアッシュのマテリアルフローをアンケート、統計から明らかにし、資源循環シミュレーターecoMAで関東のコンクリート関連工場、建設現場を再現し、コンクリート業界が混和材を大量使用することによるCO2排出削減量を定量的に評価した。
• Minimization of CO2 Emission from Concrete Recycling in Major Metropolitan Areas and Regional Areas in Japan by Using ecoMA

  Ryoma Kitagaki, Takafumi Noguchi, Hironori Nagai, Manabu Kanematsu, Ayako Iwata, Satoshi Fujimoto

  Proceedings of the 3rd ACF International Conference, Ho Chi Minh, Vietnam
• Development of Simulation System for Estimating Regional Environmental Impacts in Concrete Industries Using Multi-agent and GIS

  Hironori Nagai, Takafumi Noguchi, Manabu Kanematsu, Ayako Iwata, Ryoma Kitagaki, Satoshi Fujimoto

  Proceedings of the 3rd ACF International Conference, Ho Chi Minh, Vietnam
• Completely Recyclable Concrete of Aggregate-recovery Type by Using Microwave Heating Technology

  Masato Tsujino, Ryoma Kitagaki, Takafumi Noguchi, Hironori Nagai, Y. Kunieda

  Proceedings of the 3rd ACF International Conference, Ho Chi Minh, Vietnam
• 1576 Completely Recyclable Concrete of Aggregate-recovery Type by using Microwave Heating Technology

  TSUJINO Masato, KITAGAKI Ryoma, NOGUCHI Takafumi, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008/07  Architectural Institute of Japan
  
• 1615 Development of Resource Flow Simulation System of concrete related materials : Vol. 5 Quantitative estimation of specific CO2 emission of the concrete-related industy

  NOGUCHI Takafumi, IWATA Ayako, KANEAMTSU Manabu, KITAGAKI Ryoma, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008/07  Architectural Institute of Japan
  
• 1616 Development of Resource Flow Simulation System of concrete related materials : Vol. 6 Evaluation of environmental load in the concrete-related industy considering regionality and scale charactaristics

  IWATA Ayako, NOGUCHI Takafumi, KANEAMTSU Manabu, KITAGAKI Ryoma, NAGAI Hironori

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008/07  Architectural Institute of Japan
  
• 1227 Research on effect of power generation efficiency improvement of solar cell module using by thermal barrier and insulation coating including midair ceramic beads

  NAGAI Hironori, KITAGAKI Ryoma, NOGUCHI Takafumi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008/07  Architectural Institute of Japan
  
• 1617 Development of Resource Flow Simulation System of concrete related materials : Vol. 7 Comparison of environmental impacts between Tokyo and Hokkaido

  KITAGAKI Ryoma, IWATA Ayako, KANEMATSU Manabu, NAGAI Hironori, FUJIMOTO Satoshi, NOGUCHI Takafumi

  Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction  2008/07  Architectural Institute of Japan
  
• 118 Environmental Evaluation of Dynamism in Production and Transportation of Concrete Related Materials : Using Resource-Flow Simulation System ecoMA

  FUJIMOTO Satoshi, KITAGAKI Ryoma, NAGAI Hironori, KANEMATSU Manabu, NOGUCHI Takafumi

  Proceedings of annual research meeting Chugoku Chapter, Architectural Institute of Japan (AIJ)  2008/03  Architectural Institute of Japan
  
• The Diagram of Key Factors of Sustainable Urban Regeneration

  Ryoma Kitagaki

  Next Step on Sustainable Urban Regeneration, Tokyo
• Resource-flow Simulation in Concrete Related Industries by Using ecoMA

  Takafumi Noguchi, Manabu Kanematsu, Satoshi Fujimoto, Ryoma Kitagaki, Hironori Nagai

  International Conference on Sustainability in the cement and Concrete Industry, Lillehammer, Norway
• Resource-flow Simulation in Concrete Related Industries by Using ecoMA

  Hironori Nagai, Takafumi Noguchi, Manabu Kanematsu, Satoshi Fujimoto, Ryoma Kitagaki

  SB07 SEOUL - the International Conference on Sustainable Building Asia, Seoul, Korea
• Building Quality and Future in Medan

  Ryoma Kitagaki

  International Workshop on Urban Development & Environment, Medan, Indonesia
• Development of Material Flow Simulation System by using Multi Agent Model to Evaluate Recycling Technologies for Concrete Related Materials

  Manabu Kanematsu, Satoshi Fujimoto, Ryoma Kitagaki, Takafumi Noguchi

  2nd ACF International Conference, Bali, Indonesia
• Evaluation of Extension of Building Lifetime toward Reduction of Demolished Concrete Using Multi-Agent System, Proc. of The Sixth Int

  Satoshi Fujimoto, Ryoma Kitagaki, Manabu Kanematsu, Takafumi Noguchi

  Symposium on Cement & Concrete, Chinese Ceramic Society/CANMET/ACI
• Evaluation of Recycling Technologies of Concrete Related Materials: Toward Reduction of Waste and CO2 Emission

  Satoshi Fujimoto, Ryoma Kitagaki, Manabu Kanematsu, Takafumi Noguchi

  Proceedings of CANMET/ACI/JCI Three-Day International Symposium on Sustainable Development of Cement
• Development of Long-Term Resource Flow Management System - Concrete Related Materials in Tokyo Area -

  Satoshi Fujimoto, Ryoma Kitagaki, Manabu Kanematsu, Takafumi Noguchi, Takashi Mamiya, Koichi Suzuki

  Proc. of the 2005 World Sustainable Building Conference
• Evaluation of Features of Color Distribution Related to Visual Impression of Architectural Cladding Surfaces by Using 2DFFT

  Ryoma Kitagaki, Manabu Kanematsu, Takafumi Noguchi

  6th Asian Design International Conference

Teaching Experience

Building materialsBuilding materials Hokkaido University, Faculty of Engineering
Building process & productionBuilding process & production Hokkaido University, Faculty of Engineering
Building Construction & ManagementBuilding Construction & Management Hokkaido University, Faculty of Engineering
Experiments in building materialsExperiments in building materials Hokkaido University

Association Memberships

• Japan Society for Finishing Technology   Japan Concrete Institute   Japan Society of Civil Engineers   Architectural Institute of Japan   

Research Projects

• pH/イオン濃度分布の可視化が拓く新たな固液界面反応評価

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2021/07 -2024/03 

  Author : 川野 潤, 豊福 高志, 北垣 亮馬, 川西 咲子, 荒木 優希

   

  本研究は、研究代表者が近年開発した、反応界面における局所的なpHおよびCaイオン濃度変化を蛍光プローブを用いて可視化する技術を、多様な材料に適用できるように高精度化・汎用化することを目的としている。2022年度においては、以下について研究を進め、成果を得ている。 [1]ゲル内二重拡散法によって合成される炭酸カルシウムについて、形成環境のpHの可視化に成功した。ゲル全体のpH変化を可視化した結果、多形によって形成環境のpHの変化の傾向が異なることが明らかになった。さらにレーザー共焦点顕微鏡を用いた詳細な観察により、カルサイト成長時の結晶近傍のpHに局所的な不均一が生じることを初めて確認した。しかし、アラゴナイト形成場の近傍にはこのような傾向は観察されず、このような形成場の局所的な環境の違いも多形形成に影響を与えている可能性が示唆された。 [2]従来までに観察可能であることが示されている炭酸カルシウム以外の材料についての適用を進めた。特に、リン酸カルシウム系の材料について、溶解時のpH変化およびCaイオン濃度分布の変化を可視化したところ、アパタイトやリン酸八カルシウムなど、物質によって異なる傾向を示すことが観察された。さらに、同じ物質であっても、Naが含有しているものは、含有していないものとは大きく異なるpH変化の傾向を示すことが明らかになった。このことは、生体材料としてリン酸カルシウムを用いたり、生体内でのリン酸カルシウムの形成過程を理解する際の指針となる。
• Deterioration and enhancement mechanism of interface between inorganic and organic materials for adhering construction structure

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2019/04 -2022/03 

  Author : Kitagaki Ryoma

   

  In construction, combination of organic adhesives and inorganic substrates are used in a variety of situations, from new construction to renovation. They are expected to have high adhesive strength and can be easily and quickly installed. But the mechanisms of adhesion and deterioration have not been sufficiently discussed. In this study, to evaluate the interfaces of adhesives and inorganic substrates, we applied the methods used in the field of polymer physics to measure the type and density of chemical bonds and the pore structure to the interfaces of building materials. Samples assuming the interface between inorganic substrates and organic adhesives: composite consisting of powdery inorganic materials and organic adhesives were made and sized to the free films. After accelerated weathering test, we observed reactions between inorganic substrates and organic adhesives through results by chemical analysis discuss the mechanism of deterioration in detail.
• Carbon positive recyclable high-performance concrete

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

  Date (from‐to) : 2018/04 -2021/03 

  Author : Noguchi Takafumi

   

  A maximum strength of about 100MPa is achieved by using modified powders of by-products and wastes, amorphous powders that are naturally unused resources, alkali stimulants, shrinkage reducing agents, etc. without using Portland cement. At the same time, we researched and developed concrete that is less likely to shrink and crack. In addition, we will verify the durability and recyclability of the concrete, evaluate the carbon dioxide emissions at the concrete manufacturing stage, use stage, and disposal stage, and have high salt permeation resistance and high suppression of the alkali-silica reaction of the aggregate. We have developed concrete that can be recycled as a raw material for cement after disposal, and has a negative carbon dioxide emission over the entire life cycle.
• A Study on the Bond Splitting Strength of Low Quality Recycled Aggregate Concrete Beams reinforce with Vinylon Fiber

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

  Date (from‐to) : 2014/04 -2017/03 

  Author : MOROHASHI Noritaka, KITAGAKI Ryoma, KOYAMA Kiyoshi

   

  The bond splitting strength of low quality recycled aggregate concrete beams using vinylon fiber were studied. Compared with the case of normal aggregate concrete, the above-recycled concrete beams with vinylon fiber showed equivalent flexural cracking pattern under service loading, values of bond splitting strength at lap splices. This suggests that low quality recycled aggregate concrete could be used as a structural concrete material.
• Degradation mechanism of building coating materials using accelerated UV exposure in controlling degradation factors

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

  Date (from‐to) : 2014/04 -2016/03 

  Author : Kitagaki Ryoma

   

  (1) Development of deterioration testing equipment which can control the deteriorating factors separately including UV.(2) Gas permeability and diffusion coefficient of coatings are measurable with Thermal desorption system (3) Most building coatings are thought to be glass formation as rubber formation polymer where gas permeates and diffuses not depending on Fick’s law and Henry’s law. (4) Gas permeability and diffusion in building coatings transit behavior depending on temperature and humidity condition.(5) Interaction between gas species in diffusion process of building coatings is observed using TDS measurement.(6) Free volume theory should be introduced for understanding gas diffusion transition in building coatings under several temperature and humidity condition.
• Patterned cementitious surface conrolling sunlights reflection and its effect of CO2 reduction

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

  Date (from‐to) : 2012/04 -2014/03 

  Author : KITAGAKI Ryoma

   

  Patterned cementitious surface conrolling sunlight reflection were designed and developed to increase heat transfer from sunlight in winter and decrease in summer. A heat transfer model for the concrete surface considering heat irradiation on the surface microstructure is proposed and compared with the experimental results. As a results the surface of the concrete, which has seasonal heat selectivity, is developed and the effects of CO2 reduction are calculated quantitatively based on degree-day methods.