Researcher Database

SUGIYAMA TAKAFUMI
Faculty of Public Policy Public Policy Public Policy
Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Public Policy Public Policy Public Policy

Job Title

  • Professor

Degree

  • Ph. D.(University of New Brunswick, Graduate School)
  • (BLANK)(Hokkaido University)

Research funding number

  • 70261865

J-Global ID

Research Interests

  • コンクリート   Concrete   

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (materials, implementation, construction management)

Academic & Professional Experience

  • 2006 - Today Hokkaido University Professor
  • 1997 - 2006 Gunma University Associate Professor
  • 1994 - 1997 Gunma University Assistant Professor

Education

  • 1990 - 1994  ニューブランズウィック大学大学院
  • 1990 - 1994  University of New Brunswick  Graduate School, Division of Engineering  Civil Eng.
  • 1986 - 1990  Hokkaido University
  • 1986 - 1990  Hokkaido University  Graduate School, Division of Engineering  Civil Eng.
  • 1982 - 1986  Hokkaido University  School of Engineering  Department of Civil Engineering
  • 1982 - 1986  Hokkaido University  Faculty of Engineering

Association Memberships

  • JAPAN PRESTRESSED CONCRETE INSTITUTE   THE SOCIETY OF MATERIALS SCIENCE, JAPAN   JAPAN CONCRETE INSTITUTE   JAPAN SOCIETY OF CIVIL ENGINEERS   

Research Activities

Published Papers

  • T.B.T.Nguyena, R.C.Warangkana, S.Tangtermsirikula, T. Sugiyama
    Construction and Building Materials 209 176 - 186 2019 [Refereed][Not invited]
  • H. Takahashi, T. Sugiyama
    Construction and Building Materials 203 579 - 588 2019 [Refereed][Not invited]
  • Study on Frost Resistance of Fly Ash and Blast Furnace Slag Concrete with Steam Curing
    N., Wang, Y. Hou, T. Sugiyama
    Proceedings on 8th International Conference of Asian Concrete 2 695 - 700 2018/11 [Refereed][Not invited]
  • 非破壊CT-XRD連成法を利用した高温を受けたモルタルの変質およびひび割れに関する考察
    高橋駿人, 三上拓也, 杉山隆文
    コンクリート工学年次論文集 40 (1) 307 - 312 2018/07 [Refereed][Not invited]
  • Investigation of microstructure of cementitious material exposed to high temperature by non-destructive integrated CT-XRD method
    T. Mikami, H. Takahashi, T. Sugiyama
    Proceedings of Sixth International conference on Durability of Concrete Structures 562 - 565 2018/07 [Refereed][Not invited]
  • Idrees Zafar, Takafumi Sugiyama
    Construction and Building Materials 160 293 - 307 0950-0618 2018/01/30 [Refereed][Not invited]
     
    In the present study an effort was made to clarify the performance of pre-cracked fly ash concrete against corrosion under different exposure conditions. A total of twenty specimens from two different concrete mixes were tested against three different exposure conditions for 106 days. It was observed that the crack filling ability of concrete is more sensitive to crack width than fly ash replacement and exposure conditions. Under submerged conditions the fly ash concrete showed greater pitting corrosion, while under wet and dry cycle conditions, the corrosion damage was found to be less penetrating as compared to normal Portland cement concrete.
  • Idrees Zafar, Takafumi Sugiyama
    Construction and Building Materials 160 293 - 307 0950-0618 2018/01/30 [Refereed][Not invited]
     
    In the present study an effort was made to clarify the performance of pre-cracked fly ash concrete against corrosion under different exposure conditions. A total of twenty specimens from two different concrete mixes were tested against three different exposure conditions for 106 days. It was observed that the crack filling ability of concrete is more sensitive to crack width than fly ash replacement and exposure conditions. Under submerged conditions the fly ash concrete showed greater pitting corrosion, while under wet and dry cycle conditions, the corrosion damage was found to be less penetrating as compared to normal Portland cement concrete.
  • Study on Corrosion of RC Slab with Partial Replacement of Cement as Fly Ash Using Nondestructive Testing Method
    S. D. Gupta, T. Sugiyama
    Proceedings of 8th Asia and Pacific Young Researchers and Graduates Symposium (YRGS 2017) 2017/09 [Refereed][Not invited]
  • X線CT法を用いた引張力を受けた異形鉄筋周辺のひび割れに関する観察
    高橋駿人, 志村和紀, 杉山隆文, 田中大之
    コンクリート工学年次論文集 39 (1) 307 - 312 2017/07 [Refereed][Not invited]
  • T. Sugiyama, J. C. Kuri
    SPring-8/SACLA利用研究成果集 (SPring-8/SACLA Research Report) (5) 100 - 104 2017 [Refereed][Not invited]
  • Investigation of alteration in deteriorated mortar due to water attack using non-destructive integrated CT-XRD method
    H. Takahashi, T. Sugiyama
    Proceedings of 11th fib International Ph.D. Symposium in Civil Engineering 445 - 451 2016/08 [Refereed][Not invited]
  • 自然電位法および分極抵抗法を用いたRC床板内に2段配筋された鉄筋の腐食診断についての実験的考察
    桃野英太郎, Idrees Zafar, 杉山隆文
    コンクリート工学年次論文集 38 (1) 1239 - 1244 2016/07 [Refereed][Not invited]
  • 非破壊CT-XRD連成法を用いた流水によるセメント硬化体ひび割れ近傍の溶脱現象の観察
    菊池玲子, 高橋駿人, 杉山隆文
    コンクリート工学年次論文集 38 (1) 1095 - 1100 2016/07 [Refereed][Not invited]
  • X線CT法を用いた鉄筋埋設モルタルのひび割れおよび電食試験による腐食鉄筋の観察
    高橋駿人, 志村和紀, 杉山隆文, 田中大之
    コンクリート工学年次論文集 38 (1) 2163 - 2168 2016/07 [Refereed][Not invited]
  • Michael Angelo B. Promentilla, Shermaine M. Cortez, Regina Anne D. C. Papel, Bernadette M. Tablada, Takafumi Sugiyama
    MATERIALS 9 (5) 388  1996-1944 2016/05 [Refereed][Not invited]
     
    Pore structure, tortuosity and permeability are considered key properties of porous materials such as cement pastes to understand their long-term durability performance. Three-dimensional image analysis techniques were used in this study to quantify pore size, effective porosity, tortuosity, and permeability from the X-ray computed tomography (CT) images of deteriorated pastes that were subjected to accelerated leaching test. X-ray microtomography is a noninvasive three-dimensional (3D) imaging technique which has been recently gaining attention for material characterization. Coupled with 3D image analysis, the digitized pore can be extracted and computational simulation can be applied to the pore network to measure relevant microstructure and transport properties. At a spatial resolution of 0.50 mu m, the effective porosity (phi(e)) was found to be in the range of 0.04 to 0.33. The characteristic pore size (d) using a local thickness algorithm was found to be in the range of 3 to 7 mu m. The geometric tortuosity (tau(g)) based on a 3D random walk simulation in the percolating pore space was found to be in the range of 2.00 to 7.45. The water permeability values (K) using US NIST Permeability Stokes Solver range from an order of magnitudes of 10(-14) to 10(-17) m(2). Indications suggest that as effective porosity increases, the geometric tortuosity increases and the permeability decreases. Correlation among these microstructure and transport parameters is also presented in this study.
  • Michael Henry, Katsufumi Hashimoto, Ivan Sandi Darma, Takafumi Sugiyama
    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 14 (4) 134 - 143 1346-8014 2016/04 [Refereed][Not invited]
     
    Water re-curing of fire-damaged concrete may reduce the environmental and economic impacts of repair operations by re-using the existing concrete. To clarify the rehydration mechanism, the effects of water re-curing on the microstructure and chemical properties of fire-damaged cement paste were examined. Analysis by X-ray CT showed that heating led to radial cracks that propagated horizontally and vertically in the cement paste specimen. Water supply led to a growth in the cracked space through an increase in the connectivity of the crack network. This growth may be due to expansion caused by the rehydration of CaO into Ca(OH)(2). Chemical analyses suggest that the rehydration reaction differs from the initial hydration in that C2S plays a greater role in generating C-S-H gel during the earlier period of water re-curing.
  • Application of X-ray CT to the Observation of Cracking in a Corroded RC Bridge Slab
    J.C. Kuri, I. Zafar, T. Sugiyama
    Proceedings of 2nd International Conference on Tomography of materials and Structures (ICTMS 2015) 583 - 587 2015/06 [Refereed][Not invited]
  • Non-destructive Integrated CT-XRD Method Developed for Hardened Cementitious Material
    T. Sugiyama, T. Hitomi, K. Kajiwara
    Proceedings of 2nd International Conference on Tomography of materials and Structures (ICTMS 2015) 560 - 564 2015/06 [Refereed][Not invited]
  • Investigation on Cracked Cement Paste Subjected to Water Flow by Non-destructive Integrated CT-XRD Method
    Jhutan Chandra Kuri, Takafumi Sugiyama, Takashi Hitomi, Kentaro Kajiwara
    Proceedings of International Conference on the Regeneration and Conservation of Concrete Structures (RCCS)、Japan Concrete Institute, Nagasaki, Japan、June 1-3, 2015 2015/06 [Refereed][Not invited]
  • X線CT法を利用した気泡分布測定
    高橋駿人, 土生侑佑, 志村和紀, 杉山隆文
    JCI-C86、「コンクリート中の気泡の役割・制御に関する研究委員会」シンポジウム 59 - 64 2015 [Refereed][Not invited]
  • Study on the Corrosion of Rebars in Fly Ash Concrete during Moderate to High Corrosion Rate
    I. Zafar, T. Sugiyama
    Proceedings of Fourth International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 1538 - 1534 2014/11 [Refereed][Not invited]
  • Experimental Factors with regard to Increased Corrosion Resistance in Fly Ash Concrete
    Idrees Zafar, Takafumi Sugiyama
    Proceedings of EURO COAL ASH 2014 251 - 264 2014/11 [Refereed][Not invited]
  • Study on the effect of Bending Crack on Corrosion of Rebars in Fly Ash Concrete
    Idrees Zafar, Takafumi Sugiyama
    Proceedings of 6th International Conference of Asian Concrete Federation, ACF 2014 1111 - 1113 2014/09 [Refereed][Not invited]
  • Michael Henry, Ivan Sandi Darma, Takafumi Sugiyama
    CONSTRUCTION AND BUILDING MATERIALS 67 37 - 46 0950-0618 2014/09 [Refereed][Not invited]
     
    Microstructure recovery plays an important role in restoring the performance of concrete damaged by fire. This research applied X-ray CT and image analysis techniques to non-destructively examine the internal microstructure of high-strength concrete in order to clarify the effects of heating and re-curing on microstructure characteristics. Heating caused an increase in total pore space due to an increase in connectivity caused by the formation of cracks in the mortar-aggregate interface and bridging cracks. Water re-curing, however, was effective in recovering microstructure through the reduction in connected pore space, with most recovery occurring within 7 days. (C) 2013 Elsevier Ltd. All rights reserved.
  • M. Henry, T. Sugiyama, I. S. Darma
    Proceedings of 4th International Conference on the Durability of Concrete Structures 206 - 211 2014/07 [Refereed][Not invited]
  • T. Sugiyama, T. Hitomi, K. Kajiwara
    Proceedings of 4th International Conference on the Durability of Concrete Structures 298 - 303 2014/07 [Refereed][Not invited]
  • Idrees Zafar, Takafumi Sugiyama
    MAGAZINE OF CONCRETE RESEARCH 66 (20) 1051 - 1064 0024-9831 2014 [Refereed][Not invited]
     
    The objective of this study is to detect reliably the onset of corrosion in fly ash concrete using an embedded reference electrode. The half-cell potential of rebars in fly ash concrete subjected to 10% sodium chloride solution is monitored using an embedded reference electrode and an alternating current impedance spectroscope, along with other impedance parameters such as polarisation resistance and specific concrete resistance. At initiation of corrosion, the values of chloride threshold levels are obtained and the effect of long curing for fly ash concrete on chloride threshold values is analysed. The combination of two corrosion monitoring systems allows the estimation of corrosion initiation in fly ash concrete. It is found that chloride threshold values for fly ash concrete given a longer curing period approach the values for Portland cement concrete. Probabilistic analysis of the experimental data is carried out to find a best-fit probability distribution for time to initiate corrosion and chloride threshold values of fly ash concrete.
  • Ivan Sandi Darma, Takafumi Sugiyama, Michael Angelo B. Promentilla
    JOURNAL OF ADVANCED CONCRETE TECHNOLOGY 11 (10) 266 - 281 1346-8014 2013/10 [Refereed][Not invited]
     
    This paper demonstrates the application of microfocus X-ray computed tomography (CT) to study solute transport in cracked concrete. Cracks in a cylindrical specimen of ordinary Portland cement (OPC) and fly ash mortar were induced using a splitting tensile test. Cesium Carbonate (Cs2CO3) was then used as a tracer in the in-situ diffusion test with the aid of X-ray CT. Image analysis was also employed to measure the 3D crack geometry and tracer diffusivity from these CT images. The geometric tortuosity of the crack was approximately 1.25 irrespective of the crack opening width and whether fly ash was added or not. On the other hand, the constrictivity increased for the fly ash mortar having roughly the equivalent crack opening width. The measured diffusivity in the crack was controlled by both crack opening width and constrictivity. Results obtained from microtomographic images suggest that the entire crack space may not always be filled with the tracer. The diffusive transport of solute in cracks thus can be restricted from microstructure's point of view. Smaller crack opening would increase such restricted diffusion. Indications also suggest that the addition of fly ash would lead to the reduction of diffusivity through uncracked body of the mortar.
  • Durability of fly ash concrete in salt-laden environment
    SUGIYAMA TAKAFUMI
    3rd International Conference on Sustainable Construction Materials and Technology 19 - 24 2013/08 [Refereed][Not invited]
  • M. A B Promentilla, T. Sugiyama
    Advances in Computed Tomography for Geomaterials: GeoX 2010 124 - 131 2013/01/21 [Refereed][Not invited]
     
    This paper presents a methodology to investigate the damage process in cementbased materials that have been subjected to freezing and thawing action. The microfocus xray computed tomography (CT), a non-destructive and non-invasive imaging technique, allows us to examine the cracks in the damaged mortar at a resolution of the order of 10 micrometers. Image processing and analysis of the microtomographic images are also applied to gain three-dimensional (3D) information of the internal microstructure. This information can be used to quantify the damage parameters on the basis of the 3D characterization of cracks in the damaged mortar. Representative samples of the analyzed volumetric data are presented to demonstrate the feasibility of the proposed method. © ISTE Ltd 2010.
  • 池田昇平, 杉山隆文, 吉川昴純, 志村和紀
    コンクリート構造物の補修,補強,アップグレード論文報告集 12 207 - 214 1346-7492 2012/11 [Refereed][Not invited]
  • DARMA Ivan S, SUGIYAMA Takafumi, HITOMI Takashi, SHIMURA Kazunori
    コンクリート工学年次論文集(CD-ROM) 34 (1) 202 - 207 1347-4111 2012/06 [Refereed][Not invited]
  • 古村惇朗, 杉山隆文
    コンクリート工学年次論文集(CD-ROM) 34 (1) 1012 - 1017 1347-4111 2012/06 [Refereed][Not invited]
  • 吉川昂純, 杉山隆文, DARMA Ivan sandi, 志村和紀
    コンクリート工学年次論文集(CD-ROM) 34 (1) 1810 - 1815 1347-4111 2012/06 [Refereed][Not invited]
  • HASHIMOTO KATSUFUMI, YOKOTA HIROSHI, SATO YASUHIKO, SUGIYAMA TAKAFUMI
    セメント・コンクリート論文集 (65) 400 - 405 0916-3182 2012/02 [Refereed][Not invited]
  • 池上裕樹, 杉山隆文
    コンクリート工学年次論文集(CD-ROM) 33 (1) 1859 - 1864 1347-4111 2011/06 [Refereed][Not invited]
  • T. Sugiyama, M. A. B. Promentilla, T. Hitomi, N. Takeda
    CEMENT AND CONCRETE RESEARCH 40 (8) 1265 - 1270 0008-8846 2010/08 [Refereed][Not invited]
     
    Deteriorated mortars and cement pastes (w/c = 0.50) were prepared by an accelerated leaching test using electrochemical migration technique. This technique enabled the reduction of the CaO/SiO(2) molar ratio to less than 2.0. Non-destructive three-dimensional imaging of the internal microstructure of the deteriorated cement matrix in hardened cement paste and mortar was performed using synchrotron X-ray computed microtomography at SPring-8. Japan. After image analysis at a spatial resolution of 0.5 mu m/voxel the microtomographic images successfully visualized increased pore spaces in the deteriorated cement matrix with the effective porosity ranging from 0.31 to 0.38. In addition the diffusion tortuosity in the pore space derived from random walk simulation was also evaluated as a pore structure-transport parameter. Indications suggest that the deterioration of the cement matrix due primarily to the dissolution of portlandite decreases the diffusion tortuosity to a single digit as the degree of pore connectivity becomes larger at the submicron scale. (C) 2009 Elsevier Ltd. All rights reserved.
  • 増田亜由子, PROMENTILLA Michael Angelo B, 杉山隆文
    コンクリート工学年次論文集(CD-ROM) 32 (1) 539 - 544 1347-4111 2010/06 [Refereed][Not invited]
  • PROMENTILLA Michael Angelo B, SUGIYAMA Takafumi
    J Adv Concr Technol 8 (2) 97 - 111 1346-8014 2010 [Not refereed][Not invited]
  • Pore space analysis and estimation of transport properties of deteriorated cementitious material using synchrotron microtomography
    Promentilla, M.A.B, T. Sugiyama, T. Hitomi, N. Takeda
    Proceedings of the 2nd International RILEM workshop on Concrete Durability and Service Life Planning (ConcreteLife 2009) 498 - 506 2009/09 [Refereed][Not invited]
  • Corrosion Monitoring Rebars in Concrete under Accelerated Chloride Environment
    G.M. S. Islam, T. Sugiyama
    Proceedings of 4th International Conferernce on Construction Materials; Performance, Innovation and Structural Implication 255 - 262 2009/08 [Refereed][Not invited]
  • M. A. B. Promentilla, T. Sugiyama, T. Hitomi, N. Takeda
    CEMENT AND CONCRETE RESEARCH 39 (6) 548 - 557 0008-8846 2009/06 [Refereed][Not invited]
     
    Tortuosity, as being influenced by the 3D pore micro-geometry, is an important physical quantity to understand better the effect of pore structure on transport properties of cement-based materials. This study attempts to evaluate directly this pore structure-transport parameter from the microtomographic images at spatial resolution of 0.5 mu m. This resolution, is by far, to our knowledge, the highest resolution reported for 3D non-invasive imaging of hardened cement pastes. The results show the feasibility of using synchrotron microtomography coupled with 3D image analysis and random walk simulation to measure the diffusion tortuosity that has a direct bearing on transport properties. The tortuosity associated with the percolating pore space seems to reflect the pore morphology that mainly controls the transport properties in young cement pastes; thus, explaining the rough agreement of the results with the computer model or experimental evidence. (c) 2009 Elsevier Ltd. All rights reserved.
  • Three dimensional characterization of air void system in cement-based materials
    Promentilla, M.A.B, Sugiyama, T, Shimura, K
    Proceedings of the 3rd Asian Concrete Federation (ACF) International Conference 2008/11 [Refereed][Not invited]
  • 杉山隆文, 志村和紀, PROMENTILLA Michael A. B, 畠田大規
    コンクリート構造物の補修,補強,アップグレード論文報告集 8 99 - 104 1346-7492 2008/10/31 [Not refereed][Not invited]
  • 鈴木健太, 杉山隆文, 川北昌宏, 志村和紀
    コンクリート工学年次論文集 30 (1) 849 - 854 1347-7560 2008/07/30 [Not refereed][Not invited]
  • WATANABE MASAKI, SUGIYAMA TAKAFUMI, TOMIZAWA NAOMI, TSUJI YUKIKAZU
    セメント・コンクリート論文集 (61) 351 - 357 0916-3182 2008/02/20 [Not refereed][Not invited]
  • T. Sugiyama, W. Ritthichauy, Y. Tsuji
    CEMENT AND CONCRETE RESEARCH 38 (1) 49 - 67 0008-8846 2008/01 [Refereed][Not invited]
     
    Chloride penetration and calcium dissolution have been investigated for a saturated concrete after exposure to a 0.5 mol/L NaCl solution for a period of up to 3150 days. Simultaneous ion transport model (SiTraM) that allows the transport of chloride and calcium ions to be simultaneously simulated in a hydrated cement system has been used to verify the experimental results. Self-compacting concrete (SCC) with a water to cement ratio of 0.3 resulted in a limited chloride penetration depth while the calcium dissolution was also reduced within the near surface zone. Increased unit water content for normal concrete resulted in higher chloride penetration depth and larger dissolution front of Ca(OH)(2) regardless of having the same water to cement ratio. It was revealed that the SiTraM can predict the profiles of chloride and calcium for self-compacting concrete. It was also found that the primary factor to control chloride penetration front and the dissolution front of Ca(OH)2 was the pore structure characteristic of concrete. (C) 2007 Elsevier Ltd. All rights reserved.
  • QUANTITATIVE EVALUATION OF CHLORIDE INGRESS IN FLY ASH CONCRETE BY ELECTRON PROBE MICRO ANALYSIS (EPMA)
    Takafumi, Sugiyama, Kenta, Suzuki, Masahiro, Kawakita, Kazunori, Shimura
    ADVANCES IN CONCRETE STRUCTURAL DURABILITY, PROCEEDINGS OF ICDCS2008, VOLS 1 AND 2 (1) 295 - 301 2008 [Refereed][Not invited]
     
    Chloride ingress in fly ash concrete was evaluated by the electron probe micro analysis (EPMA). Profile of characteristic X-ray strength for chlorine was obtained for fly ash concrete by EPMA and used to calculate apparent diffusion coefficient of chloride ions. A linear equation of characteristic X-ray strength and total concentration of chloride ions that was measured by a conventional acid extraction method was determined. Surface concentration of chloride ions was then determined. It was found that the profile of total concentration of chloride ions that was calculated with the apparent diffusion coefficient and surface concentration of chloride ions was comparable to experimental results. Fly ash concrete used for concrete breakwater structure showed higher resistance against chloride ingress after 6.75 years in service.
  • THREE-DIMENSIONAL IMAGING OF CEMENT-BASED MATERIALS WITH X-RAY TOMOGRAPHIC MICROSCOPY: VISUALIZATION AND QUANTIFICATION
    M. A. B. Promentilla, T. Sugiyama, K. Shimura
    MICROSTRUCTURE RELATED DURABILITY OF CEMENTITIOUS COMPOSITES, VOLS 1 AND 2 61 1357 - 1366 2008 [Refereed][Not invited]
     
    X-ray computed microtomography is now becoming a popular non-destructive method to study the microstructure of materials. As this technique operates on the same basic principle of medical computed tomography (CT) scanners, it provides the three-dimensional (3D) reconstruction of images from finite radiological images; but with much higher spatial resolution. For example, microfocus X-ray CT systems are now being designed to study the internal microstructure of specimen at spatial resolution of order of several microns. Furthermore, since the development of synchrotron as an X-ray source, advanced X-ray CT system is continually improving to approach spatial resolutions to submicron level. Such high-resolution technique is referred in this paper as X-ray tomographic microscopy (XTM) to highlight the distinction of this 3D imaging technique from the relatively well-established method of 2D microscopic imaging obtained from optical or electron microscope. This paper, therefore, demonstrates the use of XTM technique to investigate the microstructure of cement-based materials. The potentials for high resolution microtomographic images to understand the 3D microstructure of cement-based materials in relation to the durability performance of these materials are given. For instance, the application of synchrotron microtomography to examine the pore connectivity and tortuosity of the 3D pore space in hardened cement paste is presented. In addition, application of microfocus X-ray CT to characterize the air void system of air-entrained mortar is also described in this paper.
  • Takafumi Sugiyama, Yukikazu Tsuji
    PHYSICS AND CHEMISTRY OF THE EARTH 33 S276 - S284 1474-7065 2008 [Refereed][Not invited]
     
    In this research, a migration technique was applied to accelerate the migration of calcium ions from the pore solution of concrete so as to investigate the alteration of compacted bentonite in contact with the concrete. A 15 V of direct current was used for a composite specimen with 100 mm in diameter and 100 mm in length in which the electrical potential gradient was equal to 167 V/m. This composite consists of compacted bentonite (Na-type) sand mixture and concrete that is adjacent to each other. After a target Cumulative electric charge of 13 x 103 C was reached, the specimen was removed for analysis. The results of electron probe micro analyzer (EPMA) showed that the concentration of calcium became higher in the compacted bentonite in the vicinity of the interface with the concrete. This observation was supported by the results of thermogravimetry/differential thermal analysis (TG-DTA) that provided distinct evidences of reduced quantities of Ca(OH)(2) in the concrete in the vicinity of the interface with the compacted bentonite. Therefore, calcium ions migrated from the concrete to the compacted bentonite under the given electric field. The results of the X-ray diffraction (XRD) curves indicated possible transformation of the characteristic of the compacted bentonite. However depending on the mix proportions of concrete employed, altered characterization of the compacted bentonite was different. It was found that the swelling capacity of the compacted bentonite in contact with normal concrete was decreased to 64% of its initial swelling capacity as the ratio of calcium content to sodium content (Ca/Na) increased up to 3.7. On the other hand the swelling capacity of the compacted bentonite in contact with fly ash concrete was 85% of its initial swelling capacity with a ratio (Ca/Na) of 2.3. Accordingly the use of the electrical migration technique enables quantitative evaluation of the reduced swelling capacity of the compacted bentonite in accordance with different types of hardened concrete. (C) 2008 Elsevier Ltd. All rights reserved.
  • PROMENTILLA Michael Angelo B, SUGIYAMA Takafumi, HITOMI Takashi, TAKEDA Nobufumi
    J Adv Concr Technol 6 (2) 273 - 286 1346-8014 2008 [Not refereed][Not invited]
  • KABE KEITARO, SUGIYAMA TAKAFUMI, NAKARAI KEN'ICHIRO, TSUJI YUKIKAZU
    材料 57 (10) 1005 - 1010 0514-5163 2008 [Not refereed][Not invited]
  • PROMENTILLA Michael Angelo B, SUGIYAMA Takafumi, HITOMI Takashi, TAKEDA Nobufumi
    日本コンクリート工学協会論文集 JCI-C73 357 - 366 2007/12/21 [Not refereed][Not invited]
  • Yasunori Matsuda, Takafumi Sugiyama, Naoki Tougezaka, Yukikazu Tsuji
    Zairyo/Journal of the Society of Materials Science, Japan 56 (8) 742 - 747 0514-5163 2007/08 [Not refereed][Not invited]
     
    In order to improve the durability of concrete structures under harsh chloride-laden environments the use of surface coating and cross sectional restoration methods has been increased. For these methods polymer cement mortar becomes of a primary repair material. Then interface phenomena between the polymer cement mortar and concrete as the substrate needs to be clarified with regard to chloride penetration. In this paper the results of electrical resistance tests and chloride migration tests have been provided. Interface resistance of repaired concretes has been studied by comparing electrical resistance obtained experimentally and by calculations using the ohm's law on a series circuit. It is found that the interface resistance is controlled by the type of polymer cement mortars, mix proportions of concrete and the ages. Increased interface resistance is verified by decreased flux in the chloride migration tests. For repaired concrete by cross sectional restoration, the interface resistance may be ignored where the resistance obtained by the experiment and calculation was equal. © 2007 The Society of Materials Science.
  • 峠坂直樹, 杉山隆文, 松田康紀, 半井健一郎
    コンクリート工学年次論文集 29 (1) 975 - 980 1347-7560 2007/07/30 [Not refereed][Not invited]
  • TAKAHASHI Shigeru, SAKAI Etsuo, SUGIYAMA Takafumi
    J Adv Concr Technol 5 (2) 201 - 207 1346-8014 2007/06 [Not refereed][Not invited]
  • TOMIZAWA NAOMI, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    セメント・コンクリート論文集 (60) 162 - 168 0916-3182 2007/02/20 [Not refereed][Not invited]
  • HORI AKIHIRO, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    セメント・コンクリート論文集 (60) 220 - 226 0916-3182 2007/02/20 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI, ISHII TOSHIAKI, MACHIDA YOSHITSUGU, TSUJI YUKIKAZU
    土木学会論文集 E 62 (3) 531 - 541 2006/10/25 [Not refereed][Not invited]
  • 杉山隆文, 高橋茂
    土木学会論文集 E 62 (3) 587 - 591 2006/10/25 [Not refereed][Not invited]
  • 有賀大峰, 辻幸和, 池田正志, 杉山隆文
    コンクリート工学年次論文集 28 (2) 715 - 720 1347-7560 2006/07/30 [Not refereed][Not invited]
  • 杉山隆文
    セメント・コンクリート (713) 27 - 32 0371-0718 2006/07/10 [Not refereed][Not invited]
  • 杉山隆文, 河合研至
    セメント・コンクリート (706) 11 - 20 0371-0718 2005/12/10 [Not refereed][Not invited]
  • Takafumi Sugiyama, Kosei Fukuoka, Yukikazu Tsuji
    Zairyo/Journal of the Society of Materials Science, Japan 54 (8) 816 - 821 0514-5163 2005/08 [Not refereed][Not invited]
     
    Long term behavior of a bentonite sand mixture used for the disposal of radioactive wastes has been of great concern when it continuously contacts with concrete. This is explained by the fact that the characteristics of the bentonite will be altered due to the leaching of calcium ions in the concrete. In particular the Sodium type (Na type) bentonite exhibits a reduced expansion characteristic. However little research has been conducted using a bentonite-concrete composite system to investigate long term effects. In this present research an alteration of the characteristics of the Na type bentonite is studied by the use of a concrete bentonite composite specimen. An electrical migration method was employed to accelerate the transport of calcium ions present in the pore solution in concrete through the interface of a bentonite sand mixture. A constant DC voltage of 15 V was continuously applied to a concrete bentonite composite specimen for 50 days. Chemical analysis for cation content and expansion force, the measurements of EPMA and XRD were conducted.
  • 坂本淳, 新藤竹文, 丸屋剛, 杉山隆文
    コンクリート工学年次論文集 27 (1) 325 - 330 1347-7560 2005/06/25 [Not refereed][Not invited]
  • Kenji Kawai, Takafumi Sugiyama, Koichi Kobayashi, Susumu Sano
    Journal of Advanced Concrete Technology 3 (3) 435 - 456 1346-8014 2005 [Not refereed][Not invited]
     
    This paper aims to provide common basis for the estimation of emission inventory data necessary for the evaluation of environmental impact of a concrete structure through its life cycle. Intensive literature survey and hearing to the institutes concerned have been deliberately conducted to collect relevant data to concrete materials, other materials involved, construction, demolition, and disposal and recycling. Consequently emission inventory data of CO2, SOX, NOX, and particulate matter were able to be prepared in an objective way. In addition, fundamental inventory data of these emission gases and particulate matter were provided for various kinds of energy. Furthermore most commonly used machines, instruments and other equipments on concrete structure construction are presented and provided for their related inventory data. In this way, inventory data regarding 91 detail items in total were able to be provided. By using these inventory data, four case studies where environmental impact caused by the construction of concrete structures was considered as a performance parameter of the structures similarly to serviceability, safety, and durability of the structures were also investigated based on design methods proposed previously by the authors in order to confirm the applicability of these inventory data to environmental performance evaluation of concrete structures. Copyright © 2005 Japan Concrete Institute.
  • SUGIYAMA TAKAFUMI, SHIMIZU SHUNGO, RITTHICHAUY W, TSUJI YUKIKAZU
    土木学会論文集 (767) 227 - 238 0289-7806 2004/08/20 [Not refereed][Not invited]
  • TAKEWAKA KOJI, SUGIYAMA TAKAFUMI
    土木学会論文集 (767) 1 - 9 0289-7806 2004/08/20 [Not refereed][Not invited]
  • 杉山隆文, 高見満, RITTHICHAUY, 辻幸和
    コンクリート工学年次論文集 26 (1) 819 - 824 1347-7560 2004/06/25 [Not refereed][Not invited]
  • Takafumi Sugiyama, Yukikazu Tsuji
    Zairyo/Journal of the Society of Materials Science, Japan 52 (2) 198 - 203 0514-5163 2003 [Not refereed][Not invited]
     
    Chloride ingress into concrete with high strength lightweight aggregate made of fly ash (HFA aggregate) as the coarse aggregate was evaluated by a steady state migration test and chloride ponding test. It was found that the migration coefficient obtained from the migration test could represent appropriate ranking on chloride ingress into the concrete with different W/Cs. The effect of HFA aggregate on the chloride ingress was negligible and a similar migration coefficient to that of normal weight aggregate was given. In addition, an observation using EPMA showed no chloride ion present in the HFA aggregate itself after the migration test. Chloride ponding test also exhibited same ranking providing increased apparent chloride diffusion coefficients with increased W/C. Migration coefficients might be related quantitatively to the apparent diffusion coefficient with chloride binding isotherm being properly considered.
  • Takafumi Sugiyama, Masaki Minatoya, Yukikazu Tsuji
    Zairyo/Journal of the Society of Materials Science, Japan 52 (9) 1049 - 1054 0514-5163 2003 [Not refereed][Not invited]
     
    A gas pressure difference of 0.2N/mm2 was maintained between the cross sections of concrete with simultaneous increase of loading in the split tensile strength test configuration. A single crack that formed in the longitudinal direction parallel to the loading increased the gas permeability of the concrete. It was found that gas permeability was gradually increased at a crack opening of about 0.02mm and then rapidly increased until the crack opening reached 0.08mm. The degree of water saturation of concrete had significant effect on the formation of the crack and hence failure of the concrete under investigation. Oven dried concrete exhibited gradual increase of the gas permeability while water saturated concrete showed rapid increase of the gas permeability at the crack opening of 0.02mm. In this way the gas permeability of concrete subjected to the split tensile strength test was controlled by the failure mechanism.
  • SORN V, YAMADA YOSHITOMO, SUGIYAMA TAKAFUMI, OSHIRO TAKESHI
    日本建築学会構造系論文集 (560) 17 - 25 1340-4202 2002/10/30 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI, VIRA S, TSUJI YUKIKAZU, OSHIRO TAKESHI
    土木学会論文集 (711) 191 - 203 0289-7806 2002/08/20 [Not refereed][Not invited]
  • SORN V, 山田義智, 杉山隆文, 大城武
    コンクリート工学年次論文集 24 (1) 603 - 608 1347-7560 2002/06/08 [Not refereed][Not invited]
  • TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI, YAMAGUCHI MITSUTOSHI
    土木学会論文集 (697) 179 - 192 0289-7806 2002/02/20 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI, OHATA MASATSUGU, IGARASHI TOMOMI, TSUJI YUKIKAZU
    セメント・コンクリート論文集 (56) 216 - 223 0916-3182 2002 [Not refereed][Not invited]
  • 湊谷昌樹, 杉山隆文, 辻幸和, GUPTA S
    コンクリート工学年次論文集 23 (2) 829 - 834 1347-7560 2001/06/08 [Not refereed][Not invited]
  • 大畑公嗣, 杉山隆文, 辻幸和, GUPTA S
    コンクリート工学年次論文集 23 (2) 511 - 516 1347-7560 2001/06/08 [Not refereed][Not invited]
  • 小川彰一, 吉岡民夫, 杉山隆文
    コンクリート工学年次論文集 23 (1) 385 - 390 1347-7560 2001/06/08 [Not refereed][Not invited]
  • 中田学, 辻幸和, 杉山隆文, 佐藤元
    コンクリート工学年次論文集 23 (1) 445 - 450 1347-7560 2001/06/08 [Not refereed][Not invited]
  • SUHARA KENTARO, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    土木学会論文集 (676) 105 - 115 0289-7806 2001/05/20 [Not refereed][Not invited]
  • OGAWA SHOICHI, YOSHIOKA TAMIO, SUGIYAMA TAKAFUMI
    セメント・コンクリート論文集 (55) 587 - 592 0916-3182 2001 [Not refereed][Not invited]
  • 清水俊吾, 杉山隆文, 辻幸和, GUPTA S
    コンクリート工学年次論文集 22 (1) 115 - 120 1347-7560 2000/06/01 [Not refereed][Not invited]
  • VIRA S, 大城武, 松藤泰典, 杉山隆文
    コンクリート工学年次論文集 22 (1) 139 - 144 1347-7560 2000/06/01 [Not refereed][Not invited]
  • 辻 幸和, 杉山 隆文, 橋本 親典
    材料 49 (10) 1127 - 1132 0514-5163 2000 [Not refereed][Not invited]
  • 杉山隆文, 井川一弘, 山本隆信
    日本コンクリート工学協会論文集 (53) 221 - 226 1999/11 [Not refereed][Not invited]
  • MURATA YOKO, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 21 (2) 1081 - 1086 1999/06/21 [Not refereed][Not invited]
  • YAMAGUCHI MITSUTOSHI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI, IKEDA MASASHI
    コンクリート工学年次論文報告集 21 (3) 469 - 474 1999/06/21 [Not refereed][Not invited]
  • URANO SHINJI, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    土木学会論文集 (599) 131 - 141 0289-7806 1998/08 [Not refereed][Not invited]
  • HORIUCHI ZEN, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU, HASHIMOTO CHIKANORI
    コンクリート工学年次論文報告集 20 (1) 203 - 208 1998/06 [Not refereed][Not invited]
  • OTA TOMONORI, YOKOTA TAKAO, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 20 (1) 479 - 484 1998/06 [Not refereed][Not invited]
  • YAMAMOTO TAKANOBU, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 20 (2) 97 - 102 1998/06 [Not refereed][Not invited]
  • KOYAMA HIROMITSU, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 20 (2) 295 - 300 1998/06 [Not refereed][Not invited]
  • URANO SHINJI, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    土木学会論文集 (585) 163 - 174 0289-7806 1998/02 [Not refereed][Not invited]
  • HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    セメント・コンクリート論文集 (51) 582 - 587 0916-3182 1997/12 [Not refereed][Not invited]
  • TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI, HASHIMOTO CHIKANORI, MATSUNAMI YASUYUKI
    土木学会論文集 (571) 169 - 183 0289-7806 1997/08 [Not refereed][Not invited]
  • IGARASHI KAZUMA, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 19 (1) 427 - 432 1997/06 [Not refereed][Not invited]
  • IKEDA MASASHI, TSUJI YUKIKAZU, HASHIMOTO CHIKANORI, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 19 (2) 1647 - 1652 1997/06 [Not refereed][Not invited]
  • NAGAOKA SATORU, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU, HASHIMOTO CHIKANORI
    コンクリート工学年次論文報告集 19 (1) 571 - 576 1997/06 [Not refereed][Not invited]
  • SUHARA KENTARO, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 19 (1) 421 - 426 1997/06 [Not refereed][Not invited]
  • YOKOTA TAKAO, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU, SUGIYAMA TAKAFUMI
    コンクリート工学年次論文報告集 19 (2) 681 - 686 1997/06 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI
    コンクリート工学 35 (5) 29 - 32 0387-1061 1997/05 [Not refereed][Not invited]
  • セメントペースト中の塩化物イオンの移動における電位勾配の影響
    セメント・コンクリート論文集 51 678 - 683 1997 [Not refereed][Not invited]
  • コンクリート中の塩分浸透性状の評価における電気的手法を用いた促進試験の適用性
    コンクリート工学年次論文報告集 19 (1) 859 - 864 1997 [Not refereed][Not invited]
  • 杉山 隆文, 辻 幸和, 橋本 親典, 黒岩 俊之
    土木学会論文集 (557) 101 - 109 0289-7806 1997 [Not refereed][Not invited]
  • KAKO MAKOTO, HASHIMOTO CHIKANORI, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 18 (1) 465 - 470 1996/06 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI, NAGAOKA SATORU, HASHIMOTO CHIKANORI, TSUJI YUKIKAZU
    日本コンクリート工学協会論文集 (39) 53 - 58 1996/05 [Not refereed][Not invited]
  • Effect of Stress on Gas Permeability in Concrete
    ACI Materials Journal V.93,No.5,pp.443-450 1996 [Not refereed][Not invited]
  • Cement and Concrete Research Vol.26, No.5,pp.781-790 1996 [Not refereed][Not invited]
  • コンクリートの塩化物イオン拡散係数の算定に関する電気的泳動を利用した促進試験方法
    コンクリート工学年次論文報告集 18 (1) 981 - 986 1996 [Not refereed][Not invited]
  • MATSUNAMI YASUYUKI, NISHISU MINORU, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 17 (2) 989 - 994 1995/06 [Not refereed][Not invited]
  • ARAI NORIYUKI, HASHIMOTO CHIKANORI, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 17 (1) 575 - 580 1995/06 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI
    コンクリート工学 33 (6) 44 - 51 0387-1061 1995/06 [Not refereed][Not invited]
  • IKEDA OSAMU, HASHIMOTO CHIKANORI, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 17 (1) 557 - 562 1995/06 [Not refereed][Not invited]
  • HASHIMOTO CHIKANORI, SATO RYOICHI, SUGIYAMA TAKAFUMI, TSUJI YUKIKAZU
    コンクリート工学年次論文報告集 17 (1) 551 - 556 1995/06 [Not refereed][Not invited]
  • ポンプ圧送時の管内脈動機構に関する実験的研究
    コンクリート工学年次論文報告集 Vol.17,No.1,pp.551-556 1995 [Not refereed][Not invited]
  • 可視化実験手法を用いたミキサ内のフレッシュコンクリートの練混ぜ性能に関する研究
    セメント・コンクリート論文集 No.49,pp.516-521 1995 [Not refereed][Not invited]
  • 圧縮荷重下におけるコンクリートの透気性状
    コンクリート工学年次論文報告集 17 (1) 985 - 990 1995 [Not refereed][Not invited]
  • コンクリートの中の塩素イオンの透過に及ぼす荷重の影響
    6 (1) 239 - 248 1993 [Not refereed][Not invited]
  • SUGIYAMA TAKAFUMI, SAIKI NOBORU, FUJITA YOSHIO, ARIMA NOBUHIRO
    コンクリート工学年次論文報告集 12 (1) 191 - 196 1990/06 [Not refereed][Not invited]
  • 低温下におけるコンクリート桁の衝撃破壊形伏と衝撃変形挙動
    コンクリート工学年次論文報告集 12 (1) 191 - 196 1990 [Not refereed][Not invited]
  • 低温下におけるRC版の衝撃破壊挙動
    コンクリート工学年次論文報告集 11 (1) 259 - 264 1989 [Not refereed][Not invited]

Books etc

Works

  • Effective use of coal ash for Concrete
    1998 -2002
  • The Development of Life-Cycle-Simulation-Programe for concrete ander chloride-laden environment
    1999 -2001
  • Field Survey of Concrete Durability under Severe Environmental Conditions at Treat Island
    1991

MISC

Awards & Honors

  • 2019 日本コンクリート工学会賞 功労賞
     
    受賞者: 杉山 隆文
  • 2014 日本コンクリート工学会賞 論文賞
     
    受賞者: 杉山 隆文
  • 2013 セメント協会論文賞
     
    受賞者: 杉山 隆文
  • 2006 日本コンクリート工学協会賞 論文賞
     
    受賞者: 杉山 隆文
  • 2003 セメント協会論文賞

Research Grants & Projects

  • 透視技術を核としたコンクリート構造物の革新的検査・健全度診断法の開発
    文部科学省:科学研究費補助金(基盤研究(B))
    Date (from‐to) : 2014 -2016 
    Author : 杉山 隆文
  • 非破壊CT-XRD連成法の開発とセメント硬化体研究への応用
    文部科学省:科学研究費補助金(挑戦的萌芽研究)
    Date (from‐to) : 2014 -2015 
    Author : 杉山 隆文
  • 文部科学省:科学研究費補助金(基盤研究(B))
    Date (from‐to) : 2011 -2013 
    Author : 杉山 隆文
  • 文部科学省:科学研究費補助金(挑戦的萌芽研究)
    Date (from‐to) : 2009 -2010 
    Author : 杉山 隆文, 志村 和紀
     
    微焦点(マイクロフォーカス)X線CTおよび大型放射光施設(SPring 8)における放射光X線CTを使用して、コンクリートの空隙構造の立体的可視化に向けた独創的で新規性のある技術を開発した。使用した装置は、それぞれ500ナノから10ミクロンまでの高分解能を有しており、これだけの広範囲かっ精度の高い分解能を有する装置を用いて、セメント硬化体の空隙構造を解析した研究は他には見当たらない。AEモルタルの空隙径分布および凍結融解作用によるひび割れ進展の様子を立体的に可視化することに成功した。実構造物コンクリートから採取したコア試料について、空隙構造を立体抽出し、空気量、空隙径分布、エントラップドエアに起因する粗大空隙の分布状況を調べた。また、竣工後6年半経過後であるがフライアッシュ粒子の存在を画像で捉えることができた。同一モルタル試料に対して、各装置を用いて空隙構造を解析して、耐凍害性の観点から空気量および空隙径分布を比較した。高分解能なほど微細空隙が抽出できるが、全体空気量に占めるこれら空隙体積割合は大きくないものの、気泡間隔係数の精度の良い算定に寄与すると考えられた。CT値やX線線吸収係数のヒストグラムから、空隙や水和物同定する際の閾値について調べ、さらに多様な材料特性を有する試料に対して、同一手法の有用性を調べることが必要であるとした。さらに、荷重作用によるひび割れ分布の様子を...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2007 -2009 
    Author : Takafumi SUGIYAMA, Kazunori SHIMURA
     
    Methodology to construct environment-friendly and durable concrete structures in marine cold regions was studied. Coal ash that is a by-product in thermal power plants was used for cement and sand replacement in mixing concrete. In this way concrete with coal ash showed higher durability against salt attack and freezing and thawing cycles. Integrated design to achieve both aspects was proposed.
  • 文部科学省:科学研究費補助金(萌芽研究)
    Date (from‐to) : 2007 -2008 
    Author : 杉山 隆文, 志村 和紀
     
    コンクリートの微細構造を三次元で抽出するために、放射光X線CTおよびX線マイクロCTによる画像計測手法を開発することを目的に研究を実施した。画像解析においては、一般的に、試料から一部を抽出して解析を行うが、抽出する要素が試料全体の特性を表わしていることが不可欠である。そこでREV(representative elementary volume)解析に基づいて代表要素を抽出し、この抽出領域の特性が試料全体の特性を代表しているかについて研究した。すなわち、試料全体を代表する標本を抽出できるように、十分小さくかつ空隙を巨視的に捉えられるようにREVの最適値に関して研究を実施した。本研究の範囲内で得られた知見は、次の通りである : (1)VOIのサイズが小さいほど抽出位置による空隙率のばらつきが大きいことが観測された。(2)400^3voxels以上で空隙率、標準偏差とも一定値に収束したことから、REVの最適値はその最小値を採用して、400^3voxelsすなわち200^3(μm)^3と推測した。次に、取得したデータを演算処理して得られた画像データを用いて、空隙構造の定量化指標を決定するためにランダムウォークシミュレーション法の適用を引き続き研究した。使用した供試体は、普通ボルトランドセメントを用いたセメントペーストである。材齢を2、7、28日として、空隙構造について、空隙率、連続...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2005 -2006 
    Author : Yukikazu TSUJI, 睦好 宏史, 杉山 隆文, 岸 利治
     
    In this study, in order to experimentally investigate the flexural behaviors of high performance composite structures, trial combinations of high strength expansive concrete and fiber reinforcements were carried out. Fiber reinforcements consist of short fibers and continuous fiber reinforcements. A depth of reinforced concrete member is limited to 10 cm. Target compressive strength of expansive concrete is larger than 80N/mm^2. High strength expansive concrete can be applied to composite steel structures for the purpose of not only to protect steel corrosion but also to introduce chemical ...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2004 -2006 
    Author : Takafumi SUGIYAMA, 山田 一夫, 辻 幸和
     
    This research aimed at following objectives;・Ionic Transport in Concrete Influential on Interface Chemistry・Determination of Effective Diffusion Coefficient of Surface Coating and Restoration Materials by Migration Technique・Chloride Ingress in Surface Treated Concrete・Interface Resistivity of Concrete with Surface Treated Materials・Accelerated Leaching of Calcium Ions in Concrete by Migration Technique・Alternation of Bentonite by Contact with Concrete Using Migration TechniqueBased on this research primarily findings were as followed;(1)Effective diffusion coefficients of polymer cement mo...
  • 文部科学省:科学研究費補助金(基盤研究(C))
    Date (from‐to) : 2005 -2005 
    Author : 辻 幸和, 庄谷 征美, 坂井 悦郎, 氏家 勲, 岸 利治, 杉山 隆文
     
    メンテナンスフリーで500年程度の大深度地下施設や海峡長大橋および一般の各種海洋構造物等、また設計耐用期間が数万年という放射性廃棄物埋設処分施設といった各種の超耐久性を保持する社会基盤施設について、大気中だけでなく、海中や地中の各環境条件下において、コンクリート構造物の劣化の誘因となる、溶脱、塩害、凍害の現象について、これまでの研究成果をとりまとめた。そして、500年程度の長期間と数万年という超長期間に分けてこれらの劣化現象を定量的に評価する手法を調査し、今後解決すべき課題を抽出した。この場合に、各種の劣化因子がコンクリート中に侵入する挙動を解明することとなる。この際に、構築されたコンクリート構造物に大きな影響を及ぼす施工性の定量的な評価だけでなく、マスコンクリートの温度ひび割れおよび自己収縮と炭酸化収縮に起因するコンクリート構造物のひび割れの発生が避け得ない場合には、これらのひび割れやコンクリート構造物の施工欠陥のような初期欠陥が存在するコンクリート構造物全体の耐久性や安全性の評価手法を調査することが肝要である。また、古代ローマコンクリートなどを調査してナチュラルアナログの手法を採り入れることも、超長期間の劣化現象を定量的に評価するためには不可欠である。このようなこれまでに世界の研究者や技術者が採り上げなかった研究課題について調査研究して、超耐久性コンクリート構造物の構築手...
  • 文部科学省:科学研究費補助金(萌芽研究)
    Date (from‐to) : 2004 -2005 
    Author : 辻 幸和, 栖原 健太郎, 杉山 隆文
     
    本研究は、打込み時から凝結硬化時にコンクリートに生じる沈下ひび割れを治癒するため、膨張コンクリートを基本にして膨張作用の持続期間を遅延剤や超遅延剤等により延長することにより、どのレベルまでがコンクリートの自己治癒により補修されるかを定量的に評価することを試みた。まず、膨張材を2種類とその使用量を3種類それぞれ用いて、膨張コンクリートの膨張量の発現性状を試験した。試験体は、JIS A 6202(コンクリート用膨張材)附属書2(参考)に規定されているA法一軸拘束器具を用いた。その後、沈下ひび割れの発生を模擬した試験体を用いて、沈下ひび割れへの自己治癒効果を実験した。試験体は、幅が15cm、高さが20cm、長さが75cmで、試験体中央にかぶりを3種類に変化させて直上に沈下ひび割れを発生させるようにD13鉄筋を配置したものである。ひび割れの発生およびその後の自己治癒の効果は、打込み直後から鉄筋に貼付したひずみゲージにより追跡した。材齢28日に実施した曲げ強度試験は、試験体の上下を反転させて、沈下ひび割れが引張側となるように設置して行ない、曲げひび割れ発生応力度により自己治癒の効果を定量的に判定した。以上の結果、膨張材を用いた膨張コンクリートを用いると、コンクリートに導入されるケミカルプレストレスの量以上に、沈下ひび割れを生じさせたはりの曲げひび割れ発生応力度が増加していることを確かめ...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(A))
    Date (from‐to) : 2003 -2004 
    Author : Makoto HISADA, 岩波 光保, 杉山 隆文, 加藤 佳孝, 山口 明伸, 河合 研至
     
    The purpose of this study is to evaluate the durability of concrete through the nation-wide testing and local climate monitoring. The test has been started since 2003, and still continuing.From these investigations, following conclusion was clarified.(1)The climate condition at Tsukuba was much severe than that at Kurihama in both summer and winter. In other word, Tsukuba was colder than Kurihama in winter season, and Tsukuba was hotter than Kurihama in summer season.(2)Therefore, the compressive strength of concrete exposed in Tsukuba were remarkably influenced more than that in Kurihama.
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2003 -2004 
    Author : Yukikazu TSUJI, 保利 彰宏, 睦好 宏史, 杉山 隆文
     
    In this study, in order to experimentally investigate the flexural and shear behaviors of the Partially Prestressed Concrete(PPC) structure with vertical construction joints, the bending strength tests are carried out for 45 beam specimens of size of 30cm×60cm×360cm. The parameters for the experimental work have been classified by the following factors ; 2 quality classes of the vertical joints, 35 and 70 N/mm^2 of compressive strength of concrete, the amounts of applied prestressing forces are 60% and 80% of the 0.2% offset yield strength of φ 13mm prestressing steel bar, the compressive s...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2002 -2003 
    Author : Kenji KAWAI, 枝松 良展, 小澤 一雅, 杉山 隆文, 鶴田 滋, 市川 牧彦, 枝松 良道
     
    The aim of this study is to develop an evaluation method of environmental impact of concrete in which an action toward effective uses of resources and sustainable development becomes practicable in terms of economical aspects. The development of an evaluation system of materials for concrete and the proposal of methods for evaluating environmental impact of concrete were discussed in this study.In the development of an evaluation system of materials, the effects of heavy metal leaching from concrete on environmental impact was investigated. As a result, it was found that current batch tests...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 2002 -2003 
    Author : Hirotaka KAWANO, 河合 研至, 小澤 一雅, 坂井 悦郎, 久田 真, 杉山 隆文
     
    The purpose of this study is to evaluate the influence of leaching substances from concrete during construction. Cr^<6+>,Cu^<2+> and Zn^<2+> were selected as the main substances. In addition, the amount of leaching these substances were measured during construction site.As the results, following conclusions were summarized :1.Small amount of Cr^<6+> were measured in construction site, for example, in breeding water, washing water. However, no substances were leached when concrete structures were in service.2.Basically, the amount of were quite small. Therefore, too much care against the lea...
  • 文部科学省:科学研究費補助金(基盤研究(C))
    Date (from‐to) : 2002 -2002 
    Author : 杉山 隆文, 下村 匠, 中村 光, 山田 義智, 佐藤 靖彦
     
    本研究の目的は,コンクリート構造物の性能をライフサイクルを通じて適切にかつ合理的に維持するための管理技術の構築について,共同で行う研究計画に対して企画調査を行うことであった.そこで本研究では,コンクリート構造物の劣化・損傷,性能低下,対策,対策後の性能回復・向上,再劣化,性能の再低下における時間的なサイクルの過程を定量的にシミュレートするモデルの開発に対して,材料の専門家と構造の専門家が共同して,現状の技術レベルおよび課題の抽出,モデル開発の有効性を中心に企画調査を実施することとした.本企画調査によって,補修材料のうち例えば,コンクリートの表面保護材料の耐久性が不明であり,補修後の維持管理やライフサイクルを通じたメンテナンスを考えた場合,早急にこれらの材料の耐久性の定量化が重要であることを明らかにした.これに対して,特に本研究では,シート接着鉄筋コンクリート供試体の電食試験結果と,シートの塩化物イオン拡散係数を仮定した数値解析結果とを比較することにより,シートおよび樹脂層の拡散係数を導出し,時間軸における評価手法の開発の妥当性を検討した.さらに,断面修復材のうち高耐久性のある材料についても電気泳動法によって塩化物イオン拡散係数を算出し,耐久性の合理的な評価の可能性を検討した.一方,特に厳しい海洋環境下や凍結融解作用下で劣化したコンクリート構造物の補修,補強や再劣化の実態調査で...
  • 文部科学省:科学研究費補助金(奨励研究(A), 若手研究(B))
    Date (from‐to) : 2001 -2002 
    Author : 杉山 隆文
     
    コンクリートの細孔溶液中でのイオンの拡散移動に対して,その駆動力を電気化学的ポテンシャルとして捉え,単なる濃度拡散力に限らず電気力の影響も含めるために,Onsager現象係数および一般化されたFickの法則から各イオン種の拡散現象を定量化する相互拡散モデルを構築した.つまり,コンクリート中のイオン移動現象の解明にあたって,多種類のイオン群でしかも比較的高濃度な溶液中の各イオンの移動を定量化するために必要な拡散係数の導出にあたり,相互拡散係数の概念を取り入れることに成功した.そして,分子論に立脚した相互拡散モデルの適用性をさらに詳細に調べるために,実験から得られたデータに基づいて各定数を定式化した.本研究によって開発した相互拡散モデルを用いて,細孔溶液中の塩化物イオン,硫酸イオン,アルカリ金属イオン,カルシウムイオンの移動について,過去に個別に行われたデータを収集・整理・比較しながら,モデルとの適合性を詳細に調べた.この結果から,コンクリート構造物の塩害,化学的侵食,アルカリ骨材反応,溶脱による劣化を支配しているイオン種の細孔溶液中での挙動を統一して説明できる可能性を見い出し,今後の更なる高度化への課題を抽出した.さらに,環境負荷低減に資する研究としての意義を探るために,相互拡散モデルの汎用性に関してに,六価クロムなどコンクリートに含有される微量成分についても拡張が可能かを検討...
  • 文部科学省:科学研究費補助金(萌芽的研究, 萌芽研究)
    Date (from‐to) : 2001 -2002 
    Author : 辻 幸和, 保利 彰宏, スプラティック グプタ, 杉山 隆文
     
    本研究では、膨張コンクリートを用いて打込み時から数時間に生じる沈下ひび割れをどのレベルまで、コンクリートの自己治癒により補修されるかを、実験を行い定量的に把握することを試みた。まず、膨張材を2種類とその使用量を3種類それぞれ用いて、水結合材比を変えた膨張コンクリートの膨張量の発現性状を試験した。試験体は、JIS A 6202(コンクリート用膨張材)附属書2(参考)に規定されているA法一軸拘束器具および鉄筋の配置方法を3種類に変化した鉄筋コンクリートはりを用いた。その後、沈下ひび割れへの自己治癒効果を曲げ強度実験により検討した。沈下ひび割れの発生を模擬した試験体は、幅が15cm、高さが20cm、長さが60cmで、試験体中央にかぶりを変化させて直上に沈下ひび割れを発生させるようにD13鉄筋を配置したものである。ひび割れの発生およびその後の自己治癒の効果は、鉄筋に貼付したひずみゲージにより追跡した。材齢28日に実施した曲げ強度試験は、上下を反転させて、沈下ひび割れが引張側となるように設置して、曲げひび割れ発生応力度より定量的に判定した。以上の結果、沈下ひび割れの発生レベルにより異なるが、膨張コンクリートを用いると、沈下ひび割れを自己治癒していると判定できることを確かめた。すなわち、コンクリートに導入されるケミカルプレストレスの量以上に、沈下ひび割れによる曲げ強度等の性状が改善されて...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(B))
    Date (from‐to) : 1999 -2001 
    Author : Takumi SHIMOMURA, 佐藤 靖彦, 杉山 隆文, 中村 光, 徳重 英信, 今野 克幸
     
    The objective of this research project is to develop an analytical system that can predict performance of concrete structures subjected to various load and environmental actions. Following results were obtained.1) A computer program for numerical simulation of time-dependent performance change of RC bridges subjected to chloride attack was developed. It can predict effectiveness of some rehabilitation techniques as desalination method and retrofitting of CF sheet on service life of structures.2) Material models in the computational system mentioned above were improved, which are material tr...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(基盤研究(C))
    Date (from‐to) : 1997 -1998 
    Author : Yukikazu TSUJI, 橋本 親典, 杉山 隆文
     
    Reinforced concrete beams and partially prestressed concrete beams having a vertical construction joint were produced by using both ordinary strength concrete and super high strength concrete. The vertical construction joint was placed in a shear span of the beam. A flexural loading test was carried out to take cracking behaviors and stirrup's strains of the beam. Strengthening effect of placing steel plates and prestressing to the beam was also investigated. The test results are as follows.1) The reinforced concrete beam with ordinary strength concrete was cracked firstly in the vertical c...
  • 文部科学省:科学研究費補助金(基盤研究(C))
    Date (from‐to) : 1996 -1996 
    Author : 辻 幸和, 杉山 隆文, 橋本 親典
     
    本研究では、主として断面が幅15cm、高さ20cmの矩形断面で、長さが120cmの小型RCはりを用いたが、断面が幅25cm、高さ40cmの矩形断面で、長さが360cmの大型RCはりも作製し、寸法効果についても検討した。なお、初期欠陥部に被覆する鋼板の厚さと長さは、RCはりの断面寸法に比例させた。鉛直打継目をせん断耐力が最も低下するせん断スパン中央に設けた小型RCはりを作製し、鉛直打継目を鋼板を主体とする金属板で被覆した場合の、鋼板幅、鋼板厚さ、コンクリートと鋼板の間のグラウト強度、金属板の種類がそのはりの曲げおよびせん断性状に及ぼす影響について、実験的に検討した。その結果、鉛直打継目を鋼板で被覆することにより、鉛直打継目が存在しないRCはりと比較しても、はりの耐力は増加し、破壊形式はせん断圧縮破壊から曲げ引張破壊へと移行した。また、各種試験状況の中でも、鋼板幅および鋼板厚さが、RCはりの力学的性状に大きく影響を及ぼすことが示された。そして、鋼板による補強のメカニズムについても考察を加えた。また、これらの現象を、大型のRCはりについても確かめた。更に、これまでに開発した緊張材との付着が完全な場合および付着がない場合についてのPRCはりの曲げ性状を解析するプログラムを、鉛直打継目があることを、また被覆鋼板があるこをそれぞれ考慮した曲げ性状の解析プログラムに改良して、実験結果と良い...
  • 文部科学省:科学研究費補助金(一般研究(C))
    Date (from‐to) : 1995 -1995 
    Author : 辻 幸和, 杉山 隆文, 橋本 親典
     
    プレストレスの導入率を50%と80%の2種類に変えたポストテンション方式でPCグラウトの圧縮強度を20, 50, 80MPaの3種類とPCグラウトを注入しないプレストレスト鉄筋コンクリート(PRC)はりの曲げ載荷試験を行い、緊張材の付着特性がPRCはりの曲げ性状に及ぼす影響について実験的に検討した。またPRCはりには、プレテンション方式とPC鋼より線の代わりに連続繊維補強材を用いたものも含めた。本研究により、以下のことが明らかになった。(1)プレストレスの導入率を通常用いる80%にした場合、高強度グラウトを用いれば高強度のPRCはりの曲げ性状を改善できた。特に、ひび割れやたわみは、顕著に改善できた。(2)プレストレスの導入率を50%と低く設定した場合や連続繊維補強材を用いた場合、80MPaの高強度グラウトを用いても緊張材とグラウトの一体化が不十分で、通常グラウトを用いたときと曲げひび割れやたわみには大きな差は認められなかった。しかし、曲げひび割れ発生荷重や最大荷重などは大きくなった。(3)緊張材とPCグラウトが不完全な付着状態の場合、付着のレベルを表す補正係数αの概念を用いることにより、PRCはりの曲げ性状の算定は可能である。(4)アンボンドのPRCはりの曲げ性状は、従来のアンボンドPCはりの解析で用いられている部材長の全長にわたるPC鋼材とPC鋼材位置におけるコンクリートの...
  • Ministry of Education, Culture, Sports, Science and Technology:Grants-in-Aid for Scientific Research(試験研究(B))
    Date (from‐to) : 1993 -1994 
    Author : Chikanori HASHIMOTO, 丸山 久一, 杉山 隆文, 辻 幸和
     
    A pulsatile flow of concrete flowing in pipe will adversely affect the property of the fresh concrete after being pumped as well as the pumping pipe itself. In addition, the noise resulting from the pulsating concrete flow in pipe might exceed an acceptable level from environmental points of view in the job site.This research project has been conducted to develop a novel system for pumping concrete with a minimizing degree of the pulsation in the pipe. A pumping devise designed on a small scale has two hydraulic cylinders : one for a main stream and the other for a supplemental stream, resp...
  • コンクリート-ベントナイト複合構造体の変質機構の解明
  • コンクリート構造物のライフサイクルマネジメント
  • セメント水和物系システムの移動現象論
  • Degradation mechanisum of concrete bentonite composite system
  • Performance-Based Design of Concrete Structures
  • Transport Property of cement hydrated system

Educational Activities

Teaching Experience

  • 卒業論文
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
  • Environmental Concrete Engineering
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : Environmental aspects for concrete engineering, Durability, Evaluation of environmental concrete, Presentation
  • インターンシップⅠ
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
  • Environmental Concrete Engineering
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 工学院
    キーワード : Environmental aspects for concrete engineering, Durability, Evaluation of environmental concrete, Presentation
  • インターンシップⅡ
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
  • Inter-Graduate School Classes(General Subject):Natural and Applied Sciences
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : Environmental aspects for concrete engineering, Durability, Evaluation of environmental concrete, Presentation
  • Inter-Graduate School Classes(Educational Program):JICA-University Alliance for Development Studies
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
  • Inter-Graduate School Classes(Educational Program):JICA-University Alliance for Development Studies
    開講年度 : 2018
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : Disaster prevention; Natural disaster; Flood; Heavy rainfall; Tsunami; Liquefaction; Earthquake; Japan’s ODA
  • Environmental Concrete Engineering
    開講年度 : 2018
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : Environmental aspects for concrete engineering, Durability, Evaluation of environmental concrete, Presentation
  • Environmental Concrete Engineering
    開講年度 : 2018
    課程区分 : 博士後期課程
    開講学部 : 工学院
    キーワード : Environmental aspects for concrete engineering, Durability, Evaluation of environmental concrete, Presentation
  • The World of Science and Technology
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 未来,科学技術,地球環境問題,宇宙開発,ロボット開発,クルマ,防災,社会基盤,生活
  • Concrete Engineering
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : Reinforced concrete, design, properties of concrete and steel, safety, cracks, construction
  • Concrete Engineering
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
  • Arts and Science Courses in English 2
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 国際本部
  • Applied Mathematics I
    開講年度 : 2018
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 微分方程式 フーリエ級数・ラプラス変換


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