Kurumisawa Kiyofumi
| Faculty of Engineering Sustainable Resources Engineering Resources Engineering | Associate Professor |
Last Updated :2025/11/11
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Educational Organization
- Bachelor's degree program, School of Engineering
- Master's degree program, Graduate School of Engineering
- Doctoral (PhD) degree program, Graduate School of Engineering
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Papers
- Discovering the impact of triethanolamine (TEA): how TEA dosage transforms blast-furnace slag cement hydration
Qi Zhai, Juhyuk Moon, In-Hee Hwang, Chi-sun Poon, Kiyofumi Kurumisawa
Construction and Building Materials, Sep. 2025
Scientific journal - REACTION AND STRENGTH DEVELOPMENT OF CARBONATE-ACTIVATED BLAST FURNACE SLAG COMPOSITE
KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 78, 1, 554, 561, Japan Cement Association, 31 Mar. 2025, [Peer-reviewed], [Lead author, Last author, Corresponding author]
Japanese, Carbonate is an additive that enhances the reactivity of blast furnace slag powder. The microstructural changes and strength development resulting from the reaction have not been fully investigated. In this study, we investigated the reaction and strength development of blast furnace slag powder to which carbonate was added. As a result, it was found that the addition of potassium carbonate to the system resulted in superior strength development. It was also found that the reaction was accelerated by the addition of calcium hydroxide in addition to carbonate. Gaylussite was formed in the system with the addition of sodium carbonate, while Hydrotalcite and C-A-S-H were formed in the system with the addition of potassium carbonate. The use of excess carbonate or the addition of excess calcium hydroxide made it difficult to prepare specimens due to poor flowability, indicating the need to select the appropriate amount of addition. - Prediction model for compressive strength and drying shrinkage of alkali-activated materials: Evaluation of XGBoost and LightGBM
Kong, Y.K., Kurumisawa, K.
Computers and Concrete, 35, 6, 2025
Scientific journal - Mechanical Properties and Microstructural Changes in EVA Polymer Mortar Exposed to Elevated Temperature
Runze Cai, Jize Mao, Kiyofumi Kurumisawa, Gang Shi
Journal of Materials in Civil Engineering, Jan. 2025, [Peer-reviewed]
English, Scientific journal - New insights in the adsorption behavior of triethanolamine on OPC by experimental and theoretical study
Qi Zhai, Kiyofumi Kurumisawa, Hegoi Manzano, Juhyuk Moon, In Hee Hwang
Cement and Concrete Research, 184, Oct. 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - Advances in understanding the effect of alkanolamine in cement-based materials
Qi Zhai, Kiyofumi Kurumisawa, Juhyuk Moon, In-Hee Hwang
Journal of Cleaner Production, 452, May 2024, [Peer-reviewed], [Corresponding author]
Scientific journal - INVESTIGATION OF FREEZE-THAW ACTION ON CONCRETE WITH SEVERAL CEMENT TYPES
HANAOKA Atsuhiro, KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 77, 1, 369, 376, Japan Cement Association, 29 Mar. 2024, [Peer-reviewed]
Japanese, From the viewpoint of CO2 reduction, concrete structures using blast furnace slag powder or fly ash are increasing. However, it has been pointed out in previous studies that blended cement concrete differs from ordinary Portland cement concrete in terms of the mechanism of frost damage deterioration. The purpose of this study is to quantitatively clarify the factors affecting freeze-damage deterioration using cementitious materials with different types of cement. The results showed that the resistance to freeze-thaw degradation differed among cement types, and that the air content, air spacing factor, and compressive strength could not explain the differences, but the freezing water content and coarse porosity could explain the degree of freeze-thaw degradation. - EFFECT OF TEMPERATURE ON REACTION OF BLAST FURNACE SLAG CEMENT WITH CALCIUM NITRITE
KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 77, 1, 189, 196, Japan Cement Association, 29 Mar. 2024, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Calcium nitrite is an additive that increases the reactivity of blast furnace cement, but there have been few studies on the temperature dependence of the reaction of blast furnace cement mixed with calcium nitrite. Therefore, the objective of this study was to clarify the effect of temperature on the reaction of blast furnace slag cement with calcium nitrite. Calorimeter measurements for the initial reaction rate, reaction degree measurements of cement and blast furnace slag by backscattered electron images, and mineralogical measurements by XRD were performed. The results indicated that the initial reaction of blast furnace slag cement was enhanced by the addition of calcium nitrite, but the effect was not high at 35℃ curing. It was also found that the apparent activation energy for the reaction of cement and blast furnace slag in the samples with calcium nitrite was lower than that of the unmixed samples. - Data-driven inverse mix design for sustainable alkali-activated materials
Y. K. Kong, Kiyofumi Kurumisawa, Chiharu Tokoro, Zhanzhao Li, S. H. Chu
Journal of Sustainable Cement-Based Materials, 2024, [Peer-reviewed], [Corresponding author]
English, Scientific journal - INVESTIGATION OF FREEZE-THAW ACTION ON CONCRETE WITH SEVERAL CEMENT TYPES
花岡温広, 胡桃澤清文
セメント・コンクリート論文集(Web), 77, 1, 2024, [Peer-reviewed] - EFFECT OF TEMPERATURE ON REACTION OF BLAST FURNACE SLAG CEMENT WITH CALCIUM NITRITE
胡桃澤清文
セメント・コンクリート論文集(Web), 77, 1, 2024 - A comparative study of alkanolamines and inorganic additives on the microstructure development of blast furnace slag blended cement at low curing temperature
Qi Zhai, Kiyofumi Kurumisawa, Juhyuk Moon
Construction and Building Materials, 408, Dec. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Recent Advances in X-ray Computed Tomography for Alkali-Activated Materials: A Review
Yukun Kong, Masaji Kato, Kiyofumi Kurumisawa
Journal of Advanced Concrete Technology, 21, 8, 573, 595, Aug. 2023, [Peer-reviewed], [Corresponding author] - Application of machine learning in predicting workability for alkali-activated materials
Y.K. Kong, Kiyofumi Kurumisawa
Case Studies in Construction Materials, 18, Jul. 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - Effect of curing temperatures and additional activators on chloride ingress and its induced mineralogical alteration of ground granulated blast furnace slag activated by Ca(OH)2
Zhai Qi, Yibing Zuo, Kiyofumi Kurumisawa, Aoran Lang
Cement and Concrete Composites, 141, May 2023, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Fresh properties and characteristic testing methods for alkali-activated materials: A review
Y.K. Kong, Kiyofumi Kurumisawa
Journal of Building Engineering, 75, May 2023, [Peer-reviewed], [Corresponding author]
Scientific journal - CHLORIDE ADSORPTION AND DIFFUSIVITY OF BLAST FURNANCE SLAG CEMENT USING CALCIUM NITRITE
KONDO Yuki, KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 76, 1, 187, 192, Japan Cement Association, 31 Mar. 2023, [Peer-reviewed]
Japanese, This study investigated whether the chloride adsorption performance and diffusion performance could be obtained by mixing calcium nitrite with blast furnace slag cement. As a result, we found that the chloride adsorption power and diffusion performance of the hardened blast furnace cement with calcium nitrite increased, and the reaction degree of the blast furnace slag increased as calcium nitrite was mixed. It is considered that these results are related to the increase in calcium silicate hydrate （C-S-H） and nitrite-type monosulfate （NO2-AFm） due to the addition of calcium nitrite. - Physically explicable mathematical model for strength prediction of UHPFRC
S. H. Chu, K. Kurumisawa, Y. K. Kong
Engineering Structures, 275, 15 Jan. 2023, [Peer-reviewed]
Scientific journal - CHLORIDE ADSORPTION AND DIFFUSIVITY OF BLAST FURNANCE SLAG CEMENT USING CALCIUM NITRITE
近藤勇樹, 胡桃澤清文
セメント・コンクリート論文集(Web), 76, 1, 2023 - Infilled cementitious composites (ICC) – A comparative life cycle assessment with UHPC
Y. K. Kong, K. Kurumisawa, S. H. Chu
Journal of Cleaner Production, 377, 01 Dec. 2022, [Peer-reviewed]
Scientific journal - Prediction of the drying shrinkage of alkali-activated materials using artificial neural networks
Y. K. Kong, Kiyofumi Kurumisawa
CASE STUDIES IN CONSTRUCTION MATERIALS, 17, Dec. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Recycling of calcined carbonated cement pastes as cementitious materials: Proposed CCUS technology for calcium looping
Y. K. Kong, S. Ruan, Kiyofumi Kurumisawa
Journal of Environmental Chemical Engineering, 10, 5, Oct. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Effects of cation in sulfate chloride and nitrite on Ca(OH)2 activated ground granulated blast-furnace slag
Qi Zhai, Kiyofumi Kurumisawa
Cement and Concrete Composites, 133, Oct. 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Functional and field performance of epoxy asphalt technology - state-of-the-art
Ali Jamshidi, Greg White, Kiyofumi Kurumisawa
ROAD MATERIALS AND PAVEMENT DESIGN, 24, 4, 881, 918, Apr. 2022, [Peer-reviewed], [Last author]
English, Scientific journal - EFFECT OF INROGANIC SALTS ON PROPERTIES OF BLAST FURNACE SLAG COMPOSITE
KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 75, 1, 174, 180, Japan Cement Association, 31 Mar. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
Japanese, The physical properties of the blast furnace slag composite with the inorganic salt were investigated. The compressive strength was initially increased by adding an inorganic salt. The drying shrinkage tended to differ depending on the type of inorganic salt added, and the initial shrinkage with the sulfate-based salts was lower than that without salt. On the other hand, it was shown that the shrinkage increased in the initial stage with nitrite and calcium chloride, but did not increase significantly thereafter. The diffusion coefficient also tended to differ depending on the type of the inorganic salt to which it was added, and the diffusion coefficient of specimen with inorganic salt tended to be higher than that without salt. It was considered that this was because the addition of the inorganic salt produced an aluminate-based hydrate, which reduced the amount of anions such as chloride or iodine adsorbed in specimen. It was shown that the amount of adsorption is the dominant factor on the diffusion performance of blast furnace slag composite. - Effect of Reinforcing Steel Fiber on Permeability of High Strength and Ultra Low Permeability Concrete
SAKEMOTO Kotone, KATO Masaji, ISHII Yusuke, KURUMISAWA Kiyofumi, NARA Yoshitaka
Journal of the Society of Materials Science, Japan, 71, 3, 228, 234, The Society of Materials Science, Japan, 15 Mar. 2022, [Peer-reviewed]
Japanese - EFFECT OF INROGANIC SALTS ON PROPERTIES OF BLAST FURNACE SLAG COMPOSITE
胡桃澤清文
セメント・コンクリート論文集(Web), 75, 1, 2022 - Effect of Reinforcing Steel Fiber on Permeability of High Strength and Ultra-Low Permeability Concrete
Kotone Sakemoto, Masaji Kato, Yusuke Ishii, Kiyofumi Kurumisawa, Yoshitaka Nara
Materials Transactions, 63, 12, 1639, 1644, 2022, [Peer-reviewed]
Scientific journal - Influences of CO2-cured cement powders on hydration of cement paste
Kong, Y., Song, Y., Weng, Y., Kurumisawa, K., Yan, D., Zhou, X., Wang, S., Ruan, S.
Greenhouse Gases: Science and Technology, 12, 2, 249, 262, 2022, [Peer-reviewed]
English, Scientific journal - Mechanisms of inorganic salts on Ca(OH)2-activated ground granulated blast-furnace slag curing under different temperatures
Zhai, Q., Kurumisawa, K.
Construction and Building Materials, 338, 2022, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Use of hydrated cement pastes (HCP) as a CO
2 sponge
Y. K. Kong, Y. Song, K. Kurumisawa, T. Wang, D. Yan, Q. Zeng, X. Zhou, S. Ruan
Journal of CO2 Utilization, 55, Jan. 2022, [Peer-reviewed]
Scientific journal - Effect of accelerators on Ca(OH)
2 activated ground granulated blast-furnace slag at low curing temperature
Qi Zhai, Kiyofumi Kurumisawa
Cement and Concrete Composites, 124, Nov. 2021, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Rheological characteristics of epoxy asphalt binders and engineering properties of epoxy asphalt mixtures - state-of-the-art
Ali Jamshidi, Greg White, Kiyofumi Kurumisawa
ROAD MATERIALS AND PAVEMENT DESIGN, 23, 9, 1957, 1980, Aug. 2021, [Peer-reviewed]
English, Scientific journal - Artificial Fusion Protein to Facilitate Calcium Carbonate Mineralization on Insoluble Polysaccharide for Efficient Biocementation
Thiloththama H. K. Nawarathna, Kazunori Nakashima, Tetsuya Kawabe, Wilson Mwandira, Kiyofumi Kurumisawa, Satoru Kawasaki
ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 9, 34, 11493, 11502, Aug. 2021, [Peer-reviewed]
English, Scientific journal - Effect of alkali activators on diffusivity of metakaolin-based geopolymers
Kiyofumi Kurumisawa, Hiroaki Omatu, Yuta Yamashina
Materials and Structures, 54, 4, Aug. 2021, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - EFFECT OF INORGANIC SALTS ON STRENGTH DEVELOPMENT OF HARDENED BLAST FURNACE SLAG
OMATSU Hiroaki, YAMADA Yuya, KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 74, 1, 44, 50, Japan Cement Association, 31 Mar. 2021
Japanese, Studies have been conducted on accelerators to improve the delay of initial strength development of blast furnace cement in cold regions. And their effects have been reported with various inorganic salts. However, it is still not clear that how influence inorganic salts on the reaction of blast furnace slag in blast furnace cement. In this study, we focused on inorganic salts, which are the main constituents of accelerators, and tried to elucidate their effects on reaction of blast furnace slag and their reaction mechanism. As a result, it was found that the addition of inorganic salts increased the reaction degree of blast furnace slag and enhanced the strength development. And it was also shown that the difference in aluminate hydrates produced by the reaction of blast furnace slag affected the strength development. - EFFECT OF INORGANIC SALTS ON REACTION OF BLAST FURNUCE SALG COMPOSITE
KURMISAWA Kiyofumi
Cement Science and Concrete Technology, 74, 1, 105, 110, Japan Cement Association, 2021, [Peer-reviewed], [Lead author, Corresponding author]
Japanese,In cold region such as Hokkaido, when placing concrete in winter, it is necessary to carry out appropriate curing. However, blast furnace slag cement concrete requires longer curing than ordinary Portland cement concrete. Therefore, in order to increase the use of blast furnace cement for concrete production, it is necessary to improve strength development in early age. The purpose of this study is to clarify the influence of inorganic salts on the reaction of blast furnace slag powder. In this study, we focused on hardened blast furnace slag and calcium hydroxide to clarify the influence of inorganic slats. As a result, it was clarified that the initial strength enhancement of the sample mixed with sodium sulfate was high. It was confirmed by solid-state NMR that the aluminate hydrates and the Si chain polymerization differed depending on the inorganic salt to be mixed.
- EFFECT OF INORGANIC SALTS ON STRENGTH DEVELOPMENT OF HARDENED BLAST FURNACE SLAG
大松宏彰, 山田優也, 胡桃澤清文
セメント・コンクリート論文集(Web), 74, 1, 2021, [Peer-reviewed], [Last author] - Effect of calcium leaching on diffusivity of blended cement paste and mortar
Kiyofumi Kurumisawa, Kazuko Haga, Masahito Shibata, Daisuke Hayashi
Journal of Advanced Concrete Technology, 19, 5, 426, 432, 2021, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Thermoporometry and Proton NMR Measurement on Cement Paste Equilibrated at Different Relative Humidities
Kiyofumi Kurumisawa, Ole Mejlhede Jensen
Journal of Advanced Concrete Technology, 18, 8, 456, 462, 12 Aug. 2020, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - IMPROVEMENT OF INITIAL STRENGTH OF BLAST FURNACE SLAG CEMENT PASTE USING FROST DAMAGE INHIBITOR BY ACCELERATOR
山田優也, 胡桃澤清文
セメント・コンクリート論文集(Web), 73, 1, 2020 - 異なる湿度におけるサーモポロメトリー及びプロトンNMR測定によるセメント硬化体の測定
胡桃澤清文, JENSEN Ole M.
コンクリート工学年次論文集(CD-ROM), 42, 2020, [Peer-reviewed], [Lead author, Corresponding author] - EFFECT OF ACCELARATORS ON REACTION OF BLAST FURNUCE SALG
KURMISAWA Kiyofumi
Cement Science and Concrete Technology, 73, 1, 111, 117, Japan Cement Association, 2020, [Peer-reviewed], [Lead author, Corresponding author]
Japanese,In cold region such as Hokkaido, when placing concrete in winter, it is necessary to carry out appropriate curing. However, blast furnace slag cement concrete requires longer curing than ordinary Portland cement concrete. Therefore, in order to increase the use of blast furnace cement for concrete production, it is necessary to improve initial strength development. The purpose of this study is to clarify the influence of hardening accelerator on the reaction of blast furnace slag powder. In this study, we focused on hardened blast furnace slag and calcium hydroxide to clarify the influence of accelerators. As a result, it was clarified that the initial strength enhancement of the sample mixed with nitrite-type accelerator was high. Moreover, it confirmed that the nitrite type-AFm was produced as a hydrate in sample with nitrite-type accelerator. Also, it was shown from the results of phase equilibrium model calculation that the volume of the hydrate did not change significantly.
- IMPROVEMENT OF INITIAL STRENGTH OF BLAST FURNACE SLAG CEMENT PASTE USING FROST DAMAGE INHIBITOR BY ACCELERATOR
YAMADA Yuya, KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 73, 1, 103, 110, Japan Cement Association, 2020, [Peer-reviewed], [Domestic magazines]
Japanese,The use of blast furnace cement is being promoted to reduce CO2 emissions during cement production, but in cold climates such as Hokkaido region there is a concern that initial strength of blast furnace cement may decrease by using air entrained agent （AE） for improving freeze-thaw resistance and scaling may occur. However, increase with air content decrease compressive strength, although it is possible to take measures by mixing a novel accelerator using a combination of a polyol and a sulfate and a new frost damage inhibitor for concrete such as oil type as a new method that is independent of air content, it has not been investigated whether the combined use of these agents suppresses the development of initial strength. Moreover, the effect of combined use of accelerator and a frost damage inhibitor on the reaction of blast furnace slag is not clear. Therefore, in this research, we clarified the mechanism of the strength development of the hardened blast furnace slag cement using the frost damage inhibitor and the accelerator together by performing a strength test and phase composition analysis by XRD Rietveld method and SEM observation. As a result, it was found that the C3S and C3A reaction rate increased by the accelerator, and the frost damage inhibitor did not inhibit the reaction.
- Effect of retarders on flow and strength development of alkali-activated fly ash/blast furnace slag composite
Kenta Sasaki, Kiyofumi Kurumisawa, Kouhei Ibayashi
CONSTRUCTION AND BUILDING MATERIALS, 216, 337, 346, Aug. 2019, [Peer-reviewed], [Corresponding author]
English, Scientific journal - Characterization of effects of reclaimed asphalt pavement (RAP) source and content on dynamic modulus of hot mix asphalt concrete
Ali Jamshidi, Greg White, Mehdi Hosseinpour, Kiyofumi Kurumisawa, Meor Othman Hamzah
CONSTRUCTION AND BUILDING MATERIALS, 217, 487, 497, Aug. 2019, [Peer-reviewed]
English, Scientific journal - State-of-the-art of interlocking concrete block pavement technology in Japan as a post-modern pavement
Ali Jamshidi, Kiyofumi Kurumisawa, Gregory White, Tatsuo Nishizawa, Toshifumi Igarashi, Toyoharu Nawa, Jize Mao
CONSTRUCTION AND BUILDING MATERIALS, 200, 713, 755, Mar. 2019, [Peer-reviewed]
English, Scientific journal - Use of nanotechnology in concrete pavements
Jamshidi, A., Kurumisawa, K., White, G., Jize, M., Nawa, T.
Smart Nanoconcretes and Cement-Based Materials: Properties, Modelling and Applications, 383, 401, Smart Nanoconcretes and Cement-Based Materials: Properties, Modelling and Applications, 2019, [Peer-reviewed]
Scientific journal - PORE STRUCTURE OF BLAST FURNACE SLAG CEMENT PASTE MEASURED BY THERMOPOROMETRY
胡桃澤清文
セメント・コンクリート論文集(Web), 72, 1, 2019 - EFFECT OF ACCELERATING ADMIXTURE ON EARLY STRENGTH DEVELOPMENT OF BLAST-FURNACE SLAG CEMENT PASTE
小島真実, 佐々木健太, 胡桃澤清文
セメント・コンクリート論文集(Web), 72, 1, 2019 - EFFECT OF ACCELERATING ADMIXTURE ON EARLY STRENGTH DEVELOPMENT OF BLAST-FURNACE SLAG CEMENT PASTE
OJIMA Mami, SASAKI Kenta, KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 72, 1, 114, 121, Japan Cement Association, 2019, [Peer-reviewed]
Japanese,The use of blast furnace slag cement for concrete production with air entrained agent（AE）for improving freeze-thaw resistance in cold climates such as Hokkaido region cause the decrease of the initial strength of concrete. In order to improve initial strength of concrete, a novel curing accelerator using a combination of a polyol type and a sulfate type has been developed, and a high hydration acceleration effect is obtained by previous reports. However, its hydration acceleration mechanism has not been clarified in detail. In this study, attempts were made to elucidate the mechanism of initial strength development of blast furnace slag cement by adding a new curing accelerator. Firstly, we confirmed the strength development and ultrasonic pulse velocity of hardened cement pastes with/without the hydration accelerator. And we investigated the phase assemblage in hardened cement pastes by XRD Rietveld method, and the degree of reaction of blast furnace slag in hardened blast furnace slag cement pastes was determined by backscattered electron image. As a result, it is possible to accelerate the hydration reaction of the aluminate phase by combining the polyol type and the sulfate type of agent, there is a possibility that the curing accelerator dissolves the portlandite to accelerate the reaction of the blast furnace slag fine powder.
- PORE STRUCTURE OF BLAST FURNACE SLAG CEMENT PASTE MEASURED BY THERMOPOROMETRY
KURUMISAWA Kiyofumi
Cement Science and Concrete Technology, 72, 1, 173, 180, Japan Cement Association, 2019, [Peer-reviewed], [Lead author, Corresponding author]
Japanese,Mercury intrusion porosimetry has been widely used as a method to measure the pore structure of cementitious materials, but considering the influence on the environment, a method that does not use mercury is required. Also, in the mercury intrusion porosimetry, the sample is dried before measurement, so the measurement result indicates the pore structure of the dried sample. Therefore, a thermoporometry method can be proposed as a method not requiring the use of mercury and drying process of specimen. The thermoporometry method estimates the porosity from the amount of heat generated during the freezing and thawing of water in the pore. So far, the authors have measured with a small size of sample, but in this study the thermoporometry method was applied to the bulk sample. As a result, peaks which could not be measured with a small size of sample could be detected. And it was clarified that blending blast furnace slag forms finer pore structure of hardened cement paste. Therefore, transport properties of hardened cement paste with BFS was improved. It was also clarified that the diffusion of chloride ions in hardened cement paste depends on the pore volume of 6nm or more.
- Estimating correlations between rheological characteristics, engineering properties, and CO2 emissions of warm-mix asphalt
Ali Jamshidi, Gregory White, Kiyofumi Kurumisawa, Toyoharu Nawa, Toshifumi Igarashi, Meor Othman Hamzah
JOURNAL OF CLEANER PRODUCTION, 189, 635, 646, Jul. 2018, [Peer-reviewed]
English, Scientific journal - Influence of Surface Electrical Properties of C-S-H on Chloride Binding in Slag-Blended Cementitious Materials
Elakneswaran Yogarajah, Toyoharu Nawa, Kiyofumi Kurumisawa
JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 30, 5, May 2018, [Peer-reviewed]
English, Scientific journal - Effect of Temperature vis-a-vis curing time on the hydration products of OPC paste
Dejeto Rodrigo V, Kurumisawa Kiyofumi
INTERNATIONAL JOURNAL OF ADVANCED AND APPLIED SCIENCES, 5, 5, 110, 115, May 2018, [Peer-reviewed] - Micro-mechanical modelling for the prediction of alkali-silica reaction (ASR) expansion: Influence of curing temperature conditions
Ben Li, Lalita Baingam, Kiyofumi Kurumisawa, Toyoharu Nawa, Liu XiaoZhou
CONSTRUCTION AND BUILDING MATERIALS, 164, 554, 569, Mar. 2018, [Peer-reviewed]
English, Scientific journal - Evaluation of energy requirement and greenhouse gas emission of concrete heavy-duty pavements incorporating high volume of industrial by-products
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali, Toshifumi Igarashi
JOURNAL OF CLEANER PRODUCTION, 166, 1507, 1520, Nov. 2017, [Peer-reviewed]
English, Scientific journal - Performance of pavements incorporating industrial byproducts: A state-of-the-art study
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Mao Jize, Gregory White
JOURNAL OF CLEANER PRODUCTION, 164, 367, 388, Oct. 2017, [Peer-reviewed]
English, Scientific journal - Effects of calcium leaching on diffusion properties of hardened and altered cement pastes
Kiyofumi Kurumisawa, Kazuko Haga, Daisuke Hayashi, Hitoshi Owada
PHYSICS AND CHEMISTRY OF THE EARTH, 99, 175, 183, Jun. 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Characterization of effects of thermal property of aggregate on the carbon footprint of asphalt industries in China
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Jize Mao, Ben Li
JOURNAL OF TRAFFIC AND TRANSPORTATION ENGINEERING-ENGLISH EDITION, 4, 2, 118, 130, Apr. 2017, [Peer-reviewed]
English, Scientific journal - The Impact of Tortuosity on Chloride Ion Diffusion in Slag-Blended Cementitious Materials
Hatanaka Akira, Elakneswaran Yogarajah, Kurumisawa Kiyofumi, Nawa Toyoharu
Journal of Advanced Concrete Technology, 15, 8, 426, 439, 2017, [Peer-reviewed]
English, Scientific journal - EVALUATION OF PHYSICAL PROPERTIES OF BLENDED CEMENT PASTE BASED ON PORE STRUCTURE DETERMINED BY THERMOPOROMETRY
SUGIYAMA Takuya, MIYAMOTO Masanori, KURUMISAWA Kiyofumi, HATANAKA Akira
Cement Science and Concrete Technology, 71, 1, 177, 184, Japan Cement Association, 2017, [Peer-reviewed]
Japanese,The importance of maintenance and repair of existing concrete buildings has increased. Therefore, it is necessary to know the exact deterioration condition of a concrete building structure, so it is required to accurately measure the pore structure. As one of the measurement techniques, thermoporometry has been proposed. Thermoporometry does not need drying and applying high pressure to specimen during measurement, so there is little risk of damage to the cement paste. In this study, we measured some physical property（uniaxial compressive strength, ultrasonic velocity, electric conductivity, and chloride ion diffusion）and pore structure of OPC paste and fly ash cement paste. And we investigated the relationship between the physical properties and the pore structure measured by using thermoporometry and mercury intrusion porosimetry. As a result, the uniaxial compressive strength and the ultrasonic velocity can be estimated by using pore volume measured by thermoporometry and mercury intrusion porosimetry. Transport properties such as the electric conductivity and chloride ion diffusion could be estimated by separating each OPC paste and fly ash cement paste. And it was suggested that the diffusivity could be estimated by using the quantity of pore volume detected in the freezing process around －15℃ which is the connected capillary pore volume.
- Performance of pavements incorporating waste glass: The current state of the art
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Toshifumi Igarashi
RENEWABLE & SUSTAINABLE ENERGY REVIEWS, 64, 211, 236, Oct. 2016, [Peer-reviewed]
English, Scientific journal - Evaluation of sustainable technologies that upgrade the binder performance grade in asphalt pavement construction
Ali Jamshidi, Meor Othman Hamzah, Kiyofumi Kurumisawa, Toyoharu Nawa, Bijan Samali
MATERIALS & DESIGN, 95, 9, 20, Apr. 2016, [Peer-reviewed]
English, Scientific journal - Influence of surface electrical properties of C–S–H on chloride binding in slag–blended cementitious materials
Elakeswaran Yogarajah, Toyoharu Nawa, Kiyofumi Kurumisawa
Sustainable Construction Materials and Technologies, 2016-, International Committee of the SCMT conferences, 2016
English, International conference proceedings - THE EFFECT OF THE CALCIUM LEACHING ON CHLORIDE ION ADSORPTION ABILITY OF THE HARDENED FLY ASH CEMENT PASTE
MIYAMOTO Masanori, SUGIYAMA Takuya, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 70, 1, 134, 140, Japan Cement Association, 2016, [Peer-reviewed]
Japanese,The purpose of this research is to understand the mass transfer characteristics of concrete to predict the durability of the concrete. There is a close relationship between transport properties of several ions and adsorption ability. It was reported that the adsorption ability of the concrete is changed with the calcium leaching of concrete caused by contact with such as groundwater in a long-term. It was also reported that the adsorption ability of the Calcium-silicate-hydrate（C-S-H）is dependent on its CaO/SiO2（Ca/Si）ratio, but the sample in their research is only White Portland Cement（WPC）and Blast Furnace Slag（BFS）cement. On the other hand, it is reported that FA cement has a high resistance to calcium leaching. In this study, leaching experiments using ammonium nitrate solution and chloride ion adsorption experiment were carried out for FA specimens. It was shown that Ca/Si ratio of C-S-H in each sample is decreased with and Al2O3/SiO2（Al/Si）ratio of C-S-H is increased with calcium leaching. The amount of chloride ion adsorption is linearly decreased with its Ca/Si ratio and Al/Si ratio. Finally, we established the equation for predicting the amount of chloride adsorption in C-S-H with different Ca/Si ratio and Al/Si ratio.
- EFFECT OF FLY ASH ON CONDUCTIVITY OF HARDENED CEMENT PASTE
KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 70, 1, 230, 235, Japan Cement Association, 2016, [Peer-reviewed], [Lead author, Corresponding author]
Japanese,It is necessary to evaluate transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. The electric conductivity by the AC impedance method have been suggested as simple and accurate technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with fly ash that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the fly ash cement paste was investigated by the electric conductivity measurement. The AC impedance method was applied to measure the electric conductivity of specimen, and backscattered electron image analysis and mercury intrusion method was applied for measuring pore structure in fly ash cement paste. As a result, the conductivity of fly ash cement paste was strongly depended on degree of reaction of fly ash. It was shown that a very high correlation was shown in chloride diffusion coefficient and electric conductivity regardless of a fly ash replacement ratio.
- Electrical Conductivity and Chloride Ingress in Hardened Cement Paste
Kurumisawa Kiyofumi, Nawa Toyoharu
Journal of Advanced Concrete Technology, 14, 3, 87, 94, 2016, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Public Infrastructure Asset Management
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa
INFRASTRUCTURE ASSET MANAGEMENT, 2, 4, 186, 186, Dec. 2015, [Peer-reviewed]
English - Application of thermoporometry for evaluation of properties of hardened cement paste
Kiyofumi Kurumisawa
CONSTRUCTION AND BUILDING MATERIALS, 101, P1, 926, 931, Dec. 2015, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Analysis of structural performance and sustainability of airport concrete pavements incorporating blast furnace slag
Ali Jamshidi, Kiyofumi Kurumisawa, Toyoharu Nawa, Meor Othman Hamzah
JOURNAL OF CLEANER PRODUCTION, 90, 195, 210, Mar. 2015, [Peer-reviewed]
English, Scientific journal - ELECTRIC CONDUCTIVITY OF HARDENED CEMENT PASTE WITH INORGANIC ELECTROLYTE
KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 69, 1, 207, 213, Japan Cement Association, 2015, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Hardened cement paste with various inorganic electrolytes was prepared for investigating the effect of pore structure and pore solution on electric conductivity and transport properties. As a result, it was shown that the correlation between the total pore volume measured by mercury intrusion method and the apparent diffusivity of the chloride ion of hardened cement paste was low. On the other hand, it was shown that relationship between the diffusivity of the chloride ion and electric conductivity of the hardened cement paste by the AC impedance method was linear as reported Nernst-Einstein equation. From this result, it was shown that it is possible to estimate the diffusivity of hardened cement paste by the electric conductivity measurement even if pore structure and pore solution of hardened cement paste changed. - EVALUATION OF PHYSICAL PROPERTIES OF HARDENED CEMENT PASTE BASED ON PORE STRUCTURE DETERMINED BY THERMOPOROMETRY
MIYAMOTO Masanori, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 69, 1, 183, 190, Japan Cement Association, 2015, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, It is important to evaluate the physical properties of the cement-based materials from pore structure for predicting the durability of cement based materials. Mercury Intrusion Porosimetry（MIP）is widely used for pore structure measurement method. However, it was reported that micro structure of hardened cement paste was destroyed by the drying treatment and applied high pressure. To solve them, low-temperature differential scanning calorimetry（LT-DSC）based on thermoporometry was proposed. However, studies about LT-DSC are few. Therefore, the effectiveness of LT-DSC measurement in pore structure measurement is not clear. In this study, we investigated whether pore structure measured by LT-DSC can evaluate physical properties of hardened cement paste. By comparing the results of LT-DSC and MIP, it was suggested that the measurement by MIP might cause the destruction in micro structure by drying and applied high pressure. It was cleared that it is possible to evaluate physical properties by total pore volume measured by LT-DSC. Moreover, it was indicated that threshold pore radius of the chloride ion diffusion was 7nm by using pore size distribution measured by LT-DSC. - The Influence of Leaching on the Ion Adsorption Ability of Hardened Cement Paste
Kiyofumi Kurumisawa, Haruka Abe, Toyoharu Nawa
CONCREEP 10: MECHANICS AND PHYSICS OF CREEP, SHRINKAGE, AND DURABILITY OF CONCRETE AND CONCRETE STRUCTURES, 1046, 1052, 2015, [Peer-reviewed]
English, International conference proceedings - EFFECT OF WATER TO CEMENT RATIO AND SAND CONTENT ON ELECTRIC CONDUCTIVITY OF MORTAR
KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 68, 1, 171, 177, Japan Cement Association, 2014, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, It is very important to evaluate the concrete durability for realizing sustainable society. The concrete durability is dependent on its transport properties. Therefore, it is necessary to measure the transport properties of concrete accurately. Nondestructive method is useful to measure transport properties of concrete. The resistivity measurement which is one of the nondestructive methods was proposed to measure the transport properties. It was reported that the resistivity and diffusion property is related. However, the resistivity（conductivity）is influenced by some factors such as aggregate content and water content of concrete. In this study, we investigated the conductivity of mortar for clarifying the effect of sand content or water to cement ratio（W/C）on the conductivity of mortar. As a result, mortar conductivity was dependent on its paste conductivity and the amount of sand. And it was possible to predict the conductivity of mortar by the proposed equation with water to cement ratio. It was shown that the effect of interfacial transition zone between sand and paste on conductivity is limited from the calculation of NIST model. It was clarified that there is good correlation between ultrasonic pulse velocity and electric conductivity of mortar. Finally, we suggested an equation to estimate the ultra-sonic pulse velocity of mortar from the conductivity. - THE EFFECT OF THE CALCIUM LEACHING ON CHLORIDE ION ADSORPTION ABILITY OF THE HARDENED SLAG CEMENT PASTE
ABE Haruka, ISHIGAKI Kunihiko, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 68, 1, 226, 232, Japan Cement Association, 2014, [Peer-reviewed]
Japanese, It is very important to understand mastransport properties of aggressive substances the concrete to exactly predict the durability of the concrete. Transport properties of several ions concrete is influenced by its adsorption. It was clarified in previous reports that the adsorption ability is changed with the calcium leaching of concrete during service life. It was also reported that the adsorption ability of the C-S-H is depended on its Ca/Si. However, it is the report only for hardened white cement paste（WPC）. In this study, blast furnace slag（BFS）was used for clarifying the effect of BFS on the adsorption ability of cement-based materials is investigated. As a result, the chloride adsorption ability of the specimen mixed with BFS had higher than that of only WPC even if calcium leaching occurs. It was shown that Ca/Si and Al/Si of C-S-H in specimen mixed with BFS changed with calcium leaching. And it was cleared that both of Ca/Si and Al/Si of C-S-H in specimen mixed with BFS had influence on the chloride adsorption ability. The chloride adsorption ability of C-S-H was shown to be correlated with the quantity of Q2Al in C-S-H from results of the 29Si-NMR. Finally, we established an prediction equation the chloride adsorption ability using Ca/Si and Al/Si of C-S-H. - Mechanical properties of deteriorated hardened cement paste
K. Kurumisawa, H. Owada, M. Shibata
Mechanics and Physics of Creep, Shrinkage, and Durability of Conrete: A Tribute to Zdenek P. Bazant - Proceedings of the 9th Int. Conf. on Creep, Shrinkage, and Durability Mechanics, CONCREEP 2013, 285, 292, 15 Nov. 2013 - Deteriorated hardened cement paste structure analyzed by XPS and Si-29 NMR techniques
Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada, Masahito Shibata
CEMENT AND CONCRETE RESEARCH, 52, 190, 195, Oct. 2013, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Effect of microstructure and moisture content on the electric conductivity of hardened cement paste
Kiyofumi Kurumisawa, Toyoharu Nawa
Sustainable Construction Materials and Technologies, 2013-, International Committee of the SCMT conferences, 2013
English, International conference proceedings - THE EFFECT OF THE CALCIUM LEACHING ON CAPACITY FOR CHLORIDE ION BINDING OF THE HARDENED CEMENT PASTE
KURUMISAWA Kiyofumi, MURAKAMI Yuto, ISHIGAKI Kunihiko, NAWA Toyoharu
Cement Science and Concrete Technology, 67, 1, 137, 143, Japan Cement Association, 2013, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Cement based materials such as the concrete are used as barriers of the radioactive waste disposal facilities. As for the cement based materials, the capacity for binding of the radionuclide is required in facilities, and the ability to control the leak of the nuclide to the external environment is also expected by the low diffusivity of cement based materials. The transport of radionuclide has to be controlled leakage to the external environment in the radioactive waste disposal facilities during 10,000 years. Therefore, the appropriate design of the radioactive disposal facilities is necessary, and the accurate mass transfer prediction model that considered the calcium leaching of cement based materials with the order for tens of thousands of years to evaluate it safely is necessary. In our current model, there is a difference between measurement and predicted value of chloride ion ingress as simulated a nuclide movement in the calcium leaching region of hardened cement paste. It is considered that the input parameter for the capacity for binding of the chloride ion of the hardened cement paste in calcium leaching region is not appropriate. The purpose of this study is to clarify the capacity for the binding of the hardened cement paste that calcium leaching occurred quantitatively.
In the experiment, ammonium nitrate solution was used to accelerate calcium leaching of the hardened cement paste. The hardened cement paste with different composition by changing the immersion period was produced. The capacity for binding of the chloride ion by immersing the sample in NaCl solution was determined. In addition, the mineral composition of hardened cement paste was determined by the powder X-ray diffraction with Rietveld method, and the chemical bonding state of the silica chain of calcium silicate hydrate（C-S-H） was measured by a solid nuclear magnetic resonance device（NMR） to clarify the mechanism that quantity of chloride ion adsorption changed. The results in this study are followings. As immersion period became long, the CaO/SiO2 ratio of C-S-H in sample which immersed in ammonium nitrate solution decreased, and the capacity for chloride ion binding of leached sample also decreased. As for this reason, the decrease of the adsorption site by the polymerization of silica chains in C-S-H was suggested by the results obtained from NMR measurement, and monosulfate which was one of the hydrates in hardened cement paste was disappeared by calcium leaching. The capacity for chloride ion binding of hardened cement paste was formulated by the results of experiments, and it was able to estimate the predicted value with less than 25％ of errors. - いくつかの手法による硬化セメントペーストの空隙構造の検討
胡桃澤清文, 名和豊春
コンクリート工学年次論文集(CD−ROM), 34, ROMBUNNO.1081, Jun. 2012, [Peer-reviewed], [Lead author, Corresponding author]
Japanese - Prediction of the diffusivity of cement-based materials using a three-dimensional spatial distribution model
Kiyofumi Kurumisawa, Toyoharu Nawa, Hitoshi Owada
Cement and Concrete Composites, 34, 3, 408, 418, Mar. 2012, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - BEHAVIOR OF CEMENT PASTE IN DRY AND WET CYCLE
NAWA Toyoharu
セメントコンクリート, 779, 38, 43, セメント協会, 10 Jan. 2012, [Peer-reviewed]
Japanese - THE EFFECTS OF BLEEDING ON THE MICROSTRUCTURE OF HARDENED CEMENT PASTE
ISHIGAKI Kunihiko, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 66, 1, 111, 118, Japan Cement Association, 2012, [Peer-reviewed]
Japanese, Bleeding is defined as the upward movement of water after a concrete has been placed, but it has set. It affects on the physical properties of the cured concrete. However the effect of bleeding on the microstructure has not yet been understood quantitatively. In this study, the pore structure of hardened cement paste（HCP）which was deformed by bleeding was discussed quantitatively using electron microscopy method and thermoporometry by low temperature differential scanning calorimeter（DSC）. Connectivity of pore structure was also examined by the LCR meter. It is clear that bleeding increases capillary pore in the upper part of cement paste than the lower part, and has few influence on the pore which is smaller than capillary pore. In addition, a correlation was seen between the porosity and electrical conductivity of HCP regardless of bleeding. That suggests that the connectivity of the pore structure of hardened cement paste is strongly dependent on its porosity. - MODELING OF ION TRANSPORT IN HARDENED CEMENT PASTE CONSIDERING CALCIUM LEACHING
AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, MURAKAMI Yuto
Cement Science and Concrete Technology, 66, 1, 311, 318, Japan Cement Association, 2012, [Peer-reviewed]
Japanese, It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. Thus it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. We built the prediction model of diffusion in the hardened cement paste in consideration of the change in microstructure of the hardened cement paste with the Ca leaching, which is used a Nernst-Plank equation, an electro-neutral condition, and a diffusion of ions based on the Debye-Huckel equation. As a result, we can predict the transport of ions of the hardened cement paste with calcium leaching over time and the distribution of ions. - EVALUATION OF CHOLIDE INGRESS AND MICROSTRUCTURE OF BLAST FURNACE SLAG CEMENT PASTE BY ELECTRIC CONDUCTIVITY
KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 66, 1, 127, 134, Japan Cement Association, 2012, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, Scientific journal, It is necessary to improve transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. Measurement in electric conductivity by the AC impedance method is suggested as simple and easy technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with blast furnace slag that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the blast furnace slag cement paste（BFSC）was investigated by the electric conductivity measurement. For measuring the electric conductivity the AC impedance method was applied, and backscattered electron image analysis and mercury intrusion method was used for measuring pore structure in BFSC. The relationship between porosity and the electric conductivity was expressed by the Archie's law that is expressed with exponential function, and very high correlation was shown in chloride penetration depth and electric conductivity regardless of a blast furnace slag replacement ratio. - PREDICTION OF DIFFUSION COEFFICIENT IN LEACHED HARDENED CEMENT PASTE
AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 65, 1, 161, 167, Japan Cement Association, 2011, [Peer-reviewed]
Japanese, It is very important to predict the deterioration of concrete that is used for a storage container of the radioactive waste. So it is necessary to comprehend the deterioration of cement based materials associated with calcium leaching by contact with the ground water for the super long term. However, there are not many knowledge about the diffusion performance of deterioration of calcium silicate hydrate associated with calcium leaching. Therefore, this study focused on the degradation of calcium silicate hydrate with calcium leaching, in order to gain the knowledge of the transport properties of calcium silicate hydrate. As a result, there was the correlative relationship between porosity in calcium silicate hydrate and the diffusion coefficient of chloride ion of calcium silicate hydrate associated with calcium leaching. Also, we attempted to estimate the diffusion coefficient of chloride ion in the calcium leached hardened cement paste from plain hardened cement pastes, with the deterioration of calcium silicate hydrate and calcium hydroxide. And there was no difference between estimated value of the diffusion coefficient and measured one. Therefore, it was shown that it was important to consider the leaching of calcium hydroxide and the degradation of calcium silicate hydrate in order to predict of the transport properties of cement based materials. - RECONSTRUCTION OF THREE-DIMENSIONAL SPATIAL IMAGE OF HARDENED CEMENT PASTE
Proceeding of the 13th ICCC Congress, CDROM, 2011, [Peer-reviewed], [Lead author, Corresponding author] - Interfacial Chemistry of C-S-H on Waste Ion Immobilization
Proceeding of the 13th ICCC Congress, CD-ROM, 2011 - EFFECT OF COARSE AGGREGATE ON MECHANICAL PROPERTIES OF ULTRA HIGH-STRENGTH CONCRTE
IDE Takayuki, AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 65, 1, 464, 469, Japan Cement Association, 2011, [Peer-reviewed]
Japanese, Recently, ultra high strength concrete（UHSC）over compressive strength of 150N/mm2 was developed. Ultra high strength concrete property is determined by its composition such as cement type, fine aggregate, coarse aggregate. Especially coarse aggregate was critical for making UHSC, because stress concentration is occurred at contact zone of aggregate and cement matrix. In this study, we applied to nonlinear voxel finite element method with three dimensional image of concrete. As a result, static elastic modulus and compressive strength was able to predict by this method within 10％ in error. Moreover, it was shown that the fracture strength of coarse aggregate, and the difference between the elastic modulus of mortar matrix and coarse aggregate is very important to achieve the ultra high strength of concrete. - Ion-cement hydrate interactions govern multi-ionic transport model for cementitious materials
Y. Elakneswaran, A. Iwasa, T. Nawa, T. Sato, K. Kurumisawa
CEMENT AND CONCRETE RESEARCH, 40, 12, 1756, 1765, Dec. 2010, [Peer-reviewed]
English, Scientific journal - 硬化セメントペーストの圧縮強度評価に対する非線形ボクセル有限要素解法とその適用可能性
永井 学志, 池田 翔太, 胡桃澤 清文
1, 11, 09 Aug. 2010 - Nonlocal Damage Evolution Simulation of Cement Pastes for Compressive Strength Prediction
永井 学志, 池田 翔太, 胡桃澤 清文
計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science, 15, 2, 861, 864, 日本計算工学会, May 2010, [Peer-reviewed]
Japanese - Nonlinear Voxel Finite Element Procedure for Compressive Strength Evaluation of Hardened Cement Paste and Its Applicability
永井学志, 池田翔太, 胡桃澤清文
日本計算工学会論文集(Web), 2010, 2010, 20100012, 20100012, Japan Society For Computational Engineering and Science, 2010, [Peer-reviewed]
Japanese, To predict the macroscopic compressive strengths of hardened cement paste, a digital-image-based finite element procedure for damage evolution due to local tension is developed and its applicability from practical viewpoint is studied through numerical experiments. In the procedure, microscopic three-dimensional geometries of hardened cement paste are assumed to be periodic and each phase is randomly generated by using auto-correlation function evaluated from a two-dimensional SEM image of specimen. Nonlocal isotropic damage model is employed to represented crack evolutions in the geometries. Predicted macroscopic uni-axial compressive strengths are qualitatively consistent with experimental results in terms of water-cement ratio and material age. - SUSTAINABLE DEVELOPMENT IN CONSTRUCTION
Toyoharu Nawa, Kiyofumi Kurumisawa
ADVANCES IN CONCRETE STRUCTURAL DURABILITY: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON DURABILITY OF CONCRETE STRUCTURES ICDCS2010, 211, 217, 2010, [Peer-reviewed]
English, International conference proceedings - PREDICTION OF CHLORIDE DIFFUSIVITY FROM THREE-DIMENSIONAL SPATIAL IMAGE OF CEMENT BASED MATERIALS
AOYAMA Takuto, KURUMISAWA Kiyofumi, NAWA Toyoharu, OWADA Hitoshi
Cement Science and Concrete Technology, 64, 1, 66, 73, Japan Cement Association, 2010, [Peer-reviewed]
Japanese, Scientific journal, Transport characteristic of cement based materials is close to pore structure. To evaluate transport characteristic of cement based materials which have been used for super-long term, the microstructure of cement based materials will be metamorphosed by exterior environment, so it is necessary to consider the microstructure of cement based materials. However, many prediction models of transport characteristic focus only on pore structure, there are few prediction models of transport characteristic that consider the spatial distribution of C-S-H, portlandite, and pore. Therefore, this study focuses on the spatial distribution of each phase of cement based materials. From the 2-D backscattered electron image, the auto-correlation function of each phase of cement based materials is calculated, and the 3-D spatial image of cement based materials is estimated by using the auto-correlation functions. We attempt to estimate diffusion coefficient of chloride ion from the 3-D spatial image. Estimated value of the diffusion coefficient of chloride ion from the 3-D spatial image is as half as the experimental value. And we attempt to estimate diffusion coefficient of the deteriorated sample from 3-D spatial image of normal sample. There is a difference within 10 times between the estimated value from the 3-D spatial image of the normal sample and the experimental value of the deteriorated artificially sample. - BEHAVIOR OF CEMENT PASTE IN DRY AND WET CYCLE
FUKUSHIMA Koki, ISHIMORI Masatoshi, KURUMISAWA Kiyofumi, NAWA Toyoharu
Cement Science and Concrete Technology, 64, 1, 74, 81, Japan Cement Association, 2010, [Peer-reviewed]
Japanese, Scientific journal, Dry and wet cycle experiment was carried out on hardened cement paste to understand the drying shrinkage mechanism and the effect of Shrinkage Reducing Agent（SRA）on the pore size distribution determined by Low Temperature Thermo Porosimetry（LT-DSC）. In the specimen without SRA which was held at 20 degrees Celsius and relative humidity of 40％, the volume of Small Gel Pore（1.0 to 2.2 nm in radius）was reduced but it did not recover after dry and wet cycle experiment, while the volume of Large Gel Pore（2.2 to 6.0 nm in radius）did not change. Therefore, it could be clear that at this condition the main factor of the shrinkage and expansion was aggregation and dispersion of the C-S-H unit. On the other hand, in the specimen without SRA which was held at 40 degrees Celsius and relative humidity of 40％, the volume of C-S-H Gel Pore（1.0 to 6.0 nm in radius）was reduced but it did not recover after dry and wet cycle experiment, the pore structure became coarse and the volume of capillary pore increased. Thus, it could be clear that at this condition, the main factor of the shrinkage and expansion was aggregation and dispersion of the cluster of C-S-H. In contrast, in the specimen with SRA, the pore size distribution did not change after dry and wet cycle experiment. Therefore, it could be clear that SRA retain the C-S-H Gel Pore which contributes the shrinkage and expansion to reduce strain after dry and wet cycle experiment. - DYNAMIC ELASTIC MODULUS OF CEMENT BASED MATERIALS PREDICTED BY ITS MICROSTRUCTURE
KURUMISAWA Kiyofumi, NAWA Toyoharu
Journal of Structural and Construction Engineering (Transactions of AIJ), 74, 642, 1405, 1405, Architectural Institute of Japan, Aug. 2009, [Peer-reviewed], [Lead author, Corresponding author]
Japanese, For achievement of long-term durability of concrete structures, it is important to get knowledge about properties of concrete. Nowadays, properties of concrete are determined by experimental or predicting from empirical equation. However, it is difficult to predict concrete properties at long-term, because it is impossible to do experiment. Therefore, it is necessary to make a model by considering its microstructure. Microstructure is a key for predicting the properties of concrete. Some properties are determined by microstructure such as C-S-H, calcium hydroxide, pores, unhydrated cement particles, interfacial transition zone and these interactions. In this study, we investigated dynamic elastic modulus of hardened cement pastes in view point from microstructure. Backscattered electron image was used for acquiring the microstructure image and autocorrelation function (ACF) of each phase was calculated by these images. The ACF was applied for reconstructing three dimensional structures from two dimensional images. Finally, three dimensional structures were used for calculating dynamic elastic modulus of specimen. It was cleared that the prediction result of dynamic elastic modulus used micro indentation result was good agreement with experimental result in high W/C. - Electrokinetic potential of hydrated cement in relation to adsorption of chlorides
Y. Elakneswaran, T. Nawa, K. Kurumisawa
CEMENT AND CONCRETE RESEARCH, 39, 4, 340, 344, Apr. 2009, [Peer-reviewed]
English, Scientific journal - Influence of surface charge on ingress of chloride ion in hardened pastes
Y. Elakneswaran, T. Nawa, K. Kurumisawa
MATERIALS AND STRUCTURES, 42, 1, 83, 93, Jan. 2009, [Peer-reviewed]
English, Scientific journal - Zeta potential study of paste blends with slag
Y. Elakneswaran, T. Nawa, K. Kurumisawa
CEMENT & CONCRETE COMPOSITES, 31, 1, 72, 76, Jan. 2009, [Peer-reviewed]
English, Scientific journal - イメージベースモデリングによるセメントペーストの弾性係数推定に関する基礎的検討
胡桃沢 清文
日本コンクリート工学年次論文集, 31, 1, 499, 504, 2009, [Peer-reviewed]
Scientific journal - 石灰石砕砂を用いたモルタルの強度発現と乾燥収縮に関する研究
胡桃沢 清文
日本コンクリート工学年次論文集, 31, 1, 109, 114, 2009, [Peer-reviewed]
Scientific journal - 乾燥収縮低減剤を用いたモルタルの強度低下メカニズムの一考察
胡桃沢 清文
日本コンクリート工学年次論文集, 31, 1, 589, 594, 2009, [Peer-reviewed]
Scientific journal - QUANTITATIVE STUDY OF BELITE HYDRATION BY XRD/RIETVELD ANALYSIS
KAWAKAMI Hiroyuki, NAWA Toyoharu, KURUMISAWA Kiyofumi, MINATO Daisuke
Cement Science and Concrete Technology, 63, 1, 35, 42, Japan Cement Association, 2009, [Peer-reviewed]
Japanese, Scientific journal, It has been recognized that the hydration behavior of Belite depends on the amount of Alite being coexistence with Belite, the curing temperature and the ionic concentration of leached calcium in pore solution. To understand these crucial factors on the hydration behavior of Belite, X-ray diffraction（XRD）and Rietveld analysis are carried out to quantify the hydration degree of Alite, Belite, and other cement hydrates. From the result obtained in this study, it is found that the amount of Alite has an influence on the hydration behavior of Belite；hydration degree of Belite decreases with increase in the amount of Alite. Furthermore, curing temperature（less than 50℃）does not have an affect the hydration behavior of α dicalcium silicate（α-C2S）but the hydration behavior of β dicalcium silicate（β-C2S）has temperature dependency. At high water to cement ratio of 10,000 percent, the ionic concentration of calcium in pore solution remains very low, and it brings about that the hydration degree of Alite stops at around 80％ and the induction period is disappeared；however, there is no significant different on the hydration behavior of β-C2S from that at water to cement ratio of 50％. Therefore it might be concluded that the hydration behavior of β-C2S is not affected by the ionic concentration of calcium in pore solution. - STUDY OF CEMENTITIOUS MATERIALS BY X-RAY DIFFRACTION/RIETVELD ANALYSIS
KURUMISAWA Kiyofumi
セメントコンクリート, 741, 56, 59, セメント協会, 10 Nov. 2008
Japanese - INFLUENCE OF ELECTROLYTES ON SURFACE CHARGE DENSITY OF PASTES
ELAKNESWARAN Yogarajah, NAWA Toyoharu, KURUMISAWA Kiyofumi, HAYASHI Ami
セメント・コンクリート論文集, 61, 108, 114, 20 Feb. 2008, [Peer-reviewed]
English - Micro elastic modulus of blended cement pastes
Proceedings of the 8th international conference on creep, shrinkage and durability mechanics of concrete structures, 103, 108, 2008 - XRDリートベルト法によるカルシウムシリケート相の水和解析
セメント・コンクリート論文集, 62, 39, 46, 2008, [Peer-reviewed] - エコセメント硬化体の強度発現に関する一考察
セメント・コンクリート論文集, 62, 47, 53, 2008 - セメント硬化体の微細構造と弾性挙動
日本コンクリート工学年次論文集, 30, 1, 591, 596, 2008 - 空隙構造の異なるセメント硬化体の微細構造と動弾性係数
セメント・コンクリート論文集, 62, 122, 127, 2008 - Elastic behavior and microstructure of cement-based materials
KURUMISAWA Kiyofumi, NAWA Toyoharu, NARA Yoshitaka
Proceedings of the Japan Concrete Institute, 30, 1, 591, 596, Japan Concrete Institute, 2008, [Lead author, Corresponding author]
Japanese, セメント硬化体の弾性挙動を予測することは超長期のコンクリート構造物の劣化予測を行う上で非常に重要である。しかしながら,その挙動の解析は現在までメゾからマクロの範囲において精力的に行われてきたため,ミクロで生じる物性の変化に対応するものではなかった。そこで本研究では弾性挙動の解析をミクロレベルから行うことを目的とした。そのための手法として反射電子像による硬化体中の各相の同定,インデンテーション法による各相の弾性係数の測定を行い,その結果をマクロな物性であるセメント硬化体の弾性係数と関連付けた。その結果,弾性係数は水和生成物量に大きく依存していることを明らかにした。 - Effect of mineral admixtures on microstructure formation in eco-cement paste
胡桃澤 清文, 蛭川 泰卓, 名和 豊春
Proceedings of the Japan Concrete Institute, 29, 1, 63, 68, 公益社団法人日本コンクリート工学会, 30 Jul. 2007, [Peer-reviewed]
Japanese, エコセメント(EC)に混和材(フライアッシュFA,高炉スラグ微粉末BFS)を混和した際の長期強度発現性に及ぼす微細構造の影響を明らかにするために,圧縮強度と微細構造を測定する方法として水銀圧入法,反射電子像による画像解析の適用を行った。その結果,FAとBFSを混和した試験体は長期材齢においても強度発現が見られ,材齢1年においてはECの強度よりも高い結果が得られた。また,水銀圧入の結果からも混和材を入れた試験体において総細孔量が減少し,緻密な微細構造が形成されECとは異なる構造形成がなされ,FA及びBFSの混和によりECの長期強度発現の伸びは改善されることが示された。 - SURFACE CHARGE OF HARDENED CEMENT PASTE DETERMINED BY MEMBRANE POTENTIAL
ELAKNESWARAN Yogarajah, NAWA Toyoharu, KURUMISAWA Kiyofumi, FUSHIMI Koji
セメント・コンクリート論文集, 60, 111, 117, 20 Feb. 2007, [Peer-reviewed]
English - Influence of membrane potential on the diffusion of chloride ion in the paste
12th international congress on the chemistry of cement, CDROM, 2007 - Effects of surface improvement agent composed of Lithium silicate on permeability and durability of hardened concrete
12th international congress on the chemistry of cement, CDROM, 2007 - エコセメントペーストの微細構造形成に及ぼす各種混和材料の影響
コンクリート工学年次論文報告集, CDROM, 2007 - Strength development and its microstructure of ECO-cement paste
12th internatinal congress on the chemistry of cement, CDROM, 2007 - XRD‐リートベルト法によるエコセメントペーストの水和性状解析
セメント・コンクリート論文集, 印刷中, 2007 - Temperature and relative humidity in concrete exposed under cold regions and equivalent maturity
濱 幸雄, 胡桃澤 清文, 谷口 円, 桂 修
Proceedings of the Japan Concrete Institute, 29, 1, 819, 824, 日本コンクリート工学会, 2007
Japanese, 本研究では,高分子温湿度センサーを埋め込んだコンクリートを札幌,旭川,室蘭の3都市に2年間暴露してコンクリート内部の温湿度の経時変化を測定した。その結果から,コンクリート温度推定式の提案とその検証を行うとともに,冬期間の凍結融解作用時のコンクリート内部の相対湿度と凍結最低温度の関係,コンクリート温度と相対湿度を考慮した暴露地および部材による等価積算温度の違いについて検討した。 - Effect of water curing conditions on the hydration degree and compressive strengths of fly ash-cement paste
Pipat Termkhajornkit, Toyoharu Nawa, Kiyofumi Kurumisawa
CEMENT & CONCRETE COMPOSITES, 28, 9, 781, 789, Oct. 2006, [Peer-reviewed]
English, Scientific journal - 1126 Study on influence of microstructure and strength on Hydration degree of fly-ash cement
YAMASHIRO Yoichi, SAITO Toshiki, NAWA Toyoharu, KURUMISAWA Kiyofumi
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2006, 2006, 271, 272, Architectural Institute of Japan, 31 Jul. 2006
Japanese - 1309 電磁波レーダによるコンクリート中の塩分量推定の検討(非破壊検査・診断)
胡桃澤 清文, 名和 豊春
コンクリート工学年次論文集, 28, 1, 1871, 1876, 公益社団法人日本コンクリート工学会, 30 Jul. 2006
Japanese, 電磁波レーダは,その特性からコンクリート中に含まれる塩化ナトリウム量の測定にも利用可能であることが報告されている。筆者らは,既報において電磁波レーダにより硬化セメントペースト及びモルタルでその検討を行ったが,本報ではコンクリートにその手法を適用した。その結果,既報と同様に電磁波レーダによって得られた波形を周波数解析することによりコンクリート中の塩化ナトリウム量の違いを明らかにすることができた。また,1%の塩化ナトリウムが表層部の1cmの厚さに含まれている場合においても周波数解析を受信波形に行うことによってその違いを明らかにすることができた。 - Nondestructive Measurement of Chloride Content in Concrete Structure by Electromagnetic Radar
NAWA T., KURUMISAWA K.
コンクリート工学 = Concrete journal, 44, 5, 31, 34, 日本コンクリート工学協会, 01 May 2006
Japanese - Three-dimensional visualization of pore structure in hardened cement paste by the gallium intrusion technique
K Kurumisawa, K Tanaka
CEMENT AND CONCRETE RESEARCH, 36, 2, 330, 336, Feb. 2006, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Chloride contents measurement in concrete by using electromagnetic wave radar
胡桃澤 清文, 名和 豊春
Proceedings of the Japan Concrete Institute, 28, 1, 1871, 1876, 日本コンクリート工学協会, 2006
Japanese, 電磁波レーダは,その特性からコンクリート中に含まれる塩化ナトリウム量の測定にも利用可能であることが報告されている。筆者らは,既報において電磁波レーダにより硬化セメントペースト及びモルタルでその検討を行ったが,本報ではコンクリートにその手法を適用した。その結果,既報と同様に電磁波レーダによって得られた波形を周波数解析することによりコンクリート中の塩化ナトリウム量の違いを明らかにすることができた。また,1%の塩化ナトリウムが表層部の1cmの厚さに含まれている場合においても周波数解析を受信波形に行うことによってその違いを明らかにすることができた。 - XRDリートベルト法によるエコセメントの水和解析
セメント・コンクリート論文集, 60, 134, 141, 2006 - IMAGE ANALYSIS OF HARDENED CEMENT PASTE MIXED FLY ASH BY USING BACKSCATTER ELECTRON IMAGE AND ENERGY DISPERSIVE X-RAY ANALYSIS
KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
Journal of Structural and Construction Engineering (Transactions of AIJ), 71, 603, 1, 7, Architectural Institute of Japan, 2006
Japanese, Recently, the amount of the exhaust of fly ash increases by increasing thermal power plant. Using it as a concrete mixture material is an effective method for decreasing waste. However, the influence on the hydration of the cement and reaction rate of fly ash is not examined in detail. Then, the cement paste that mixed fly ash examined it by Backscattered Electron image and element image measured by Energy Dispersive X-ray analysis in this research. As a result, reaction rate of fly ash and distribution of fly ash and cement in the fly ash-cement pastes were clarified. And the amount of composition in fly ash cement paste was cleared. - ELASTIC BEHAVIOR OF HARDENED CEMENT PASTE BY USING BACKSCATTER ELECTRON IMAGE AND ELEMENT IMAGE USING ENERGY-DISPERSIVE X-RAY ANALYSIS
KURUMISAWA Kiyofumi, TERMKHAJORNKIT Pipat, NAWA Toyoharu
Journal of Structural and Construction Engineering (Transactions of AIJ), 71, 603, 9, 15, Architectural Institute of Japan, 2006
Japanese, The elastic properties of concrete depend on the characteristic of cement matrix and coarse aggregates. The elastic characteristic of cement matrix depends on the cement paste when the properties of the fine aggregate are constant. That is, clarifying the characteristic of the cement matrix clarifies the elastic properties of concrete. Therefore, the technique for predicting the elastic modulus of the cement paste from the viewpoint of microstructure was examined in this research. It classified into four phases (pore, C-S-H, calcium hydroxide, and unhydrated cement) in the backscattered electron image, and examined it by the finite element method in two dimension. The result indicates the elastic modulus of hardened cement paste strongly depends on the porosity of large pores. Moreover, it is cleared that the elastic modulus hardly changes by differences of the number of pixels and the magnification of images in this study. - 電磁波レーダーによるコンクリート中の塩分量推定の検討
コンクリート工学年次論文集, 28, 1, 1871, 1876, 2006 - Effect of GGBS on Membrane Potential of Pastes
Y. Elakneswaran, T. Nawa, K. Kurumisawa, K. Fushimi
RILEM Proceedings PRO 46, Concrete Durability and Service Life Planning (ConcreateLife’06), 405, 414, 2006, [Peer-reviewed]
English, International conference proceedings - A STUDY OF FLY ASH-CEMENT HYDRATION BY RIETVELD ANALYSIS AND SELECTIVE DISSOLUTION
TERMKHAJORNKIT PIPAT, NAWA TOYOHARU, KURUMISAWA KIYOFUMI
コンクリート工学年次論文集, 27, 1, 169, 174, 25 Jun. 2005, [Peer-reviewed]
English - IMAGE ANALYSIS OF HARDENED CEMENT PASTE BY USING BACKSCATTER ELECTRON IMAGE-ENERGY DISPERSIVE X-RAY ANALYSIS
KURUMISAWA Kiyofumi, NAWA Toyoharu
Journal of Structural and Construction Engineering (Transactions of AIJ), 70, 595, 9, 15, Architectural Institute of Japan, 2005
Japanese, Scientific journal, The durability of concrete is greatly influenced by the physical properties of the hardened cement paste. The physical properties of hardened cement paste are dependent on the degree of hydration and porosity of hardened cement paste. Therefore, it is important to measure the degree of hydration and porosity of hardened cement paste correctly. Measuring them, some methods are proposed, XRD, point counting or TG/DTA as example. Then, in this research, with Backscatter electron image (BEI) and Energy dispersive X-ray analysis (EDX), the degree of hydration and porosity of hardened cement paste are measured, and clarifying the distribution of the composition. By using BEI and EDX together, as a result of applying the method, the degree of hydration and porosity of hardened cement paste were clarified and the distribution of a compound was clarified further. - 反射電子像とエネルギー分散型X線分析により測定された元素分布像による各種セメントの構成化合物量の測定
胡桃澤 清文
セメント・コンクリート論文集, 59, 38, 44, 2005, [Peer-reviewed]
Scientific journal - 電磁波レーダーを利用したセメント硬化体中の塩分量推定の検討
胡桃澤 清文, 名和 豊春
コンクリート工学年次論文集, 27, 1, 1771, 1776, 日本コンクリート工学協会, 2005
Japanese, コンクリート構造物の耐久性を評価する上で,コンクリートの劣化の程度を測定することは重要である。特に鉄筋の腐食を考慮したとき,その劣化を促進する塩化ナトリウム含有量を正確に測定することが求められる。そこで本研究では,塩化ナトリウム含有量を非破壊で測定することができる方法の1つとして電磁波レーダーに着目して検討を行った。その結果,電磁波レーダーの受信波形を周波数解析することにより塩化ナトリウム含有量の推定は可能であることを示した。また,FDTD法(Finite-difference time-domain)を用いて,いくつかの条件下での電磁波の伝播特性について検討を行い,その特性を明らかにした。 - A Study of Fly Ash-Cement Hydration by Rietveld Analysis and Selective Dissolution
TERMKHAJORNKIT Pipat, NAWA Toyoharu, KURUMISAWA Kiyofumi
Proceedings of the Japan Concrete Institute, 27, 1, 169, 174, 日本コンクリート工学協会, 2005
English, コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会 - IMAGINGANALYSIS OF RELATIONSHIP BETWEEN PORE STRUCTURE AND PERMEABILITY OF Cl^- IN HARDENED CEMENT PASTE
KURUMISAWA Kiyofumi, TANAKA Kyoji
Journal of Structural and Construction Engineering (Transactions of AIJ), 69, 584, 23, 28, Architectural Institute of Japan, 2004
Japanese, It is well known that most of property of concrete is influenced by its pore structure. ln particularly permeability of concrete is dependent on its pore structure. Therefore, it is beneficial to know durability of concrete that pore structure is measured exactly. We already developed the technique to make clear the pore structure in hardened cement paste by gallium intrusion and the following EPMA observation. In this research, using a image acauired by EPMA estimates diffusion coefficient with random walk which is many particles are walking in pore structure with random. The permeability of NaCl solution is measured by method of diffusion cell. Relationship between permeability of NaCI solution and pore structure by measuring gallium intruded method is discussed. As a result, pore connectivity and permeability is closely relationship. - DEVELOPMENT OF THREE-DIMENSIONAL OBSERVATION TECHNIQUE FOR PORE STRUCTURE IN HARDENED CEMENT PASTE
KURUMISAWA Kiyofumi, TANAKA Kyoji
Journal of Structural and Construction Engineering (Transactions of AIJ), 67, 556, 9, 14, Architectural Institute of Japan, 2002
Japanese, It is widely known that the property of concrete is influenced by its pore structure, particularly permeability of concrete is directly dependent on it. We have already developed the technique to make clear the pore structure in hardened cement paste by applying gallium intrusion technique and the following EPMA observation. However, this method has only limited to 2 dimensional analysis. We improve the technique to 3 dimensional analysis of pores by stacking up 75 sheets of 2-D pore image pictures. In this paper, 3-D pore image is made up and pore distribution, shape and continuity of various hardened cement paste were discussed. - Development of technique for observing pores in hardened cement paste
Tanaka, K., Kurumisawa, K.
Cement and Concrete Research, 32, 9, 1435, 1441, 2002, [Peer-reviewed], [Corresponding author]
Scientific journal - 2131 セメントペーストの打ち込み高さごとの空隙構造の違い(物性一般)
胡桃澤 清文, 田中 享二
コンクリート工学年次論文集, 23, 2, 781, 786, 公益社団法人日本コンクリート工学会, 08 Jun. 2001
Japanese, セメントペーストの空隙構造は打ち込み方向から表層部、中層部、下層部によって大きく違うことが予想される。一般的に表層部の構造は粗いといわれているがどのような構造の差であるかをガリウム圧入法で測定、EPMA測定により画像化しさらに定量的評価を行った。その結果、表層部では大きくその構造は他の部位とは異なり粗い構造であることが明らかになった。またその表層部の構造を材齢7日と28日を比較したとき、材齢28日経過した後でもそれほど改善されないことが画像から明らかとなった。 - セメントペーストの打ち込み高さごとの空隙構造の違い
胡桃澤 清文, 田中 享二
コンクリート工学年次論文報告集, 23, 2, 781, 786, 日本コンクリート工学協会, 08 Jun. 2001
Japanese, セメントペーストの空隙構造は打ち込み方向から表層部、中層部、下層部によって大きく違うことが予想される。一般的に表層部の構造は粗いといわれているがどのような構造の差であるかをガリウム圧入法で測定、EPMA測定により画像化しさらに定量的評価を行った。その結果、表層部では大きくその構造は他の部位とは異なり粗い構造であることが明らかになった。またその表層部の構造を材齢7日と28日を比較したとき、材齢28日経過した後でもそれほど改善されないことが画像から明らかとなった。 - COMPARISON OF PORE STRUCTURE IN CEMENT-BASED MATERIAL BY VARIOUS METHOD
KURUMISAWA Kiyofumi, TANAKA Kyoji
セメント・コンクリート論文集, 54, 654, 659, 10 Feb. 2001
Japanese - CHANGE OF PORE STRUCTURE OF HARDENED CEMENT IN EARLY AGE
KURUMISAWA Kiyofumi, TANAKA Kyoji
Journal of Structural and Construction Engineering (Transactions of AIJ), 66, 544, 1, 6, Architectural Institute of Japan, 2001
Japanese, To understand the property of concrete, the knowledge about pore structure of hardened cement is important, particularly in early age of a few weeks, because the pore structure change by active hydration. In the paper, the change of pore structure in early age was investigated by observation of pores through gallium intrusion method developed by the authors and EPMA analysis. As the technique is limited to 2-dimensional analysis, the simulation of hydration developed by Bentz was furthermore carried outto obtain 3-dimensional information about pore structure. It was quantitatively made clear that the value of pore and the number of continuous pores rapidly decreased in early age. - 硬化途中におけるセメントペーストの空隙構造の変化
日本建築学会構造系論文集, 1, 6, 2001 - Visualization of Pore Structure in Cement-based Materials
KURUMISAWA Kiyofumi, TANAKA Kyoji
Proceedings of the Japan Concrete Institute, 22, 2, 691, 696, Japan Concrete Institute, 01 Jun. 2000
Japanese, コンクリートの物性を理解する上で,現在はセメント硬化体の細孔構造を測定する方法として水銀圧入法が広く利用されている。しかしこの測定法は細孔量および細孔径ごとの分布を測定することが出来るが,細孔の形態及びその位置を得ることができない。本研究では水銀圧入法では得ることが出来ないこれらの情報を知る測定法を開発し,セメント硬化体の細孔構造を可視化することを試みた。さらにその測定法を用いて各種条件下におけるセメント硬化体の細孔構造の変化を画像として明らかにすることを行った。 - Visualizaiton of Pore Structure in Cement-based Materials
KURUMISAWA Kiyofumi, TANAKA Kyoji
コンクリート工学年次論文報告集, 22, 2, 691, 696, 日本コンクリート工学協会, 01 Jun. 2000
Japanese, コンクリートの物性を理解する上で,現在はセメント硬化体の細孔構造を測定する方法として水銀圧入法が広く利用されている。しかしこの測定法は細孔量および細孔径ごとの分布を測定することが出来るが,細孔の形態及びその位置を得ることができない。本研究では水銀圧入法では得ることが出来ないこれらの情報を知る測定法を開発し,セメント硬化体の細孔構造を可視化することを試みた。さらにその測定法を用いて各種条件下におけるセメント硬化体の細孔構造の変化を画像として明らかにすることを行った。 - DEVELOPMENT OF TECHNIQUE FOR OBSERVING PORES IN HARDENED CEMENT PASTE
TANAKA Kyoji, KURUMISAWA Kiyofumi
Journal of Structural and Construction Engineering (Transactions of AIJ), 65, 532, 21, 26, Architectural Institute of Japan, 2000
Japanese, A mercury intrusion technique has been widely used to measure micro pores in porous materials. However, the information of shapes and locations of pores are not able to get through the measurement. A new technique for directly observing pores, in which gallium of liquid state is pressed into pores at higher temperature of its transformation temperature of 29.8℃ and then solidified by cooling down, was developed to measure them. The technique was applied to cement paste. The picture image of distribution of solidified gallium was observed through an electron probe micro analyzer (EPMA), and the shapes and locations of pores in cement paste were discussed. - ガリウムを用いた空隙観察手法の開発と他方法との比較
セメント・コンクリート論文集, 54, 654, 659, 2000 - セメント硬化体の空隙構造の画像化
コンクリート工学年次論文集, 22, 2, 691, 696, 2000 - セメント硬化体の空隙観察手法の開発
日本建築学会構造系論文集, 21, 26, 2000 - EFFECT OF ELECTRO-OSMOTIC PROPERTY OF HARDENED CEMENT PASTE ON ION PERMEABILITY
ABE Shinya, TANAKA Kyoji, KURUMISAWA Kiyofumi
セメント・コンクリート論文集, 53, 0, 928, 933, 25 Dec. 1999
Japanese
Other Activities and Achievements
- Impact of curing temperature and additional activators on the hydration of Ca(OH)2 activated GGBFS
ZHAI Qi, 胡桃澤清文, セメント技術大会講演要旨(CD-ROM), 76th, 2022 - 収縮低減剤の使用によるセメントペーストの水和反応に及ぼす影響
鳴海 玲子, 松沢 友弘, 西 祐宜, 胡桃澤 清文, 材料施工, 2016, 19, 20, 24 Aug. 2016
日本建築学会, Japanese - 収縮低減剤の使用がセメントペーストの水和反応性に及ぼす影響
松沢友弘, 西祐宜, 安田玲子, 胡桃澤清文, 土木学会年次学術講演会講演概要集(CD-ROM), 71st, 2016 - 1162 Resistivity of hardened cement paste measured by two methods
KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of annual meeting, 2015, 323, 324, 04 Sep. 2015
Architectural Institute of Japan, Japanese - Evaluation of a proposal to design of an integrated system for analysis of structural performance and environmental impact assessments
胡桃沢 清文, Civil Engineering and Architecture, 3, 73, 78, 2015, [Peer-reviewed] - 1182 Effect of W/C and sand on electric conductivity of mortar
KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of annual meeting, 2014, 363, 364, 12 Sep. 2014
Architectural Institute of Japan, Japanese - 1378 Effect of moisture content on electric conductivity in hardened cement paste
KURUMISAWA Kiyofuim, NAWA Toyoharu, Summaries of technical papers of annual meeting, 2012, 755, 756, 12 Sep. 2012
Architectural Institute of Japan, Japanese - 1637 Pore structure of cement based materials measured by backscattered electron image and mercury intrusion method
KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2010, 1273, 1274, 20 Jul. 2010
Architectural Institute of Japan, Japanese - Prediction of ionic adsorption and multi–ionic transport in cementitious materials
Elakneswaran Yogarajah, Nawa Toyoharu, Sato Tsutomu, Kurumisawa Kiyofumi, Iwasa Akihito, Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan, 2010, 0, 836, 836, 2010
Cementitious materials are being used for encapsulation, back filling, and grouting purposes in deep geological repositories of long – lived radioactive waste. The long – term performance of cementitious materials has been investigating for safety disposal of radioactive waste. The durability performance of cementitious materials is mainly determined by resistance to transport of aggressive substances, however remain poorly understood. In this study, a thermodynamic integrated model has been developed to simulate multi-ionic transport in cementitious materials with considering ionic adsorption. The model has been validated against measured experimental data., Atomic Energy Society of Japan, Japanese - 1392 Micro Mechanics of Ultra High Strength Cement Paste
JEON Jin-Hwan, MOMOSE Haruki, KANDA Tetsuji, KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2009, 783, 784, 20 Jul. 2009
Architectural Institute of Japan, Japanese - An integrated model to predict the relations between electrical double layer properties and chloride ingress in cement - Based materials
Y. Elakneswaran, T. Nawa, K. Kurumisawa, RILEM Workshop on Long-Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants, NUCPERF 2009, 135, 142, 01 Jan. 2009 - B19 粘土とセメントの相互作用に関するXAFSを用いた研究(口頭発表,一般講演)
沼子 千弥, 坂本 浩幸, 芳賀 和子, 柴田 真仁, 大和田 仁, 黒澤 進, 山田 憲和, 中澤 俊之, 佐藤 努, 胡桃澤 清文, 安楽 総大郎, 粘土科学討論会講演要旨集, 52, 122, 123, 03 Sep. 2008
日本粘土学会, Japanese - XAFS Study for interaciton between clayminerals and cements
Numako Chiya, Kurumizawa Kiyofumi, Anraku Sotaro, Sakamoto Hiroyuki, Haga Kazuko, Shibata Masahito, Ohwada Hitoshi, Kurosawa Susumu, Yamada Norikazu, Nakazawa Toshiyuki, Sato Tsutomu, Abstracts of annual meeting of The Clay Science Society of Japan, 52, 0, 45, 45, 2008
放射性廃棄物の地層処理に関して人工バリアとして設計されているベントナイトとセメントの相互作用を評価するために、放射光を用いたXAFS分析を適用した。XAFS測定は高エネルギー物理学研究機構物質構造科学研究所放射光実験施設Photon FactoryのBL9Aにおいて行った。試料としては合成CSHと種々の粘土鉱物、また人工バリア模擬体を３年程度浸水実験した試験片に対して行った。その結果、XAFS法が試料中のCaの化学形の決定及びベントナイトーセメント相互作用の評価に有用であることが解った。, The Clay Science Society of Japan, Japanese - 高炉スラグ微粉末混入ペーストの塩分浸透性と微細構造
胡桃澤清文, 土木学会, 混和材料を使用したコンクリートの物性変化と性能評価研究小委員会, シンポジウム講演概要集, 2007, 74, 2007 - 1193 Measurement of elasticity of hydrated cement paste by micro indentation
KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2006, 405, 406, 31 Jul. 2006
Architectural Institute of Japan, Japanese - 1213 Effect of curing temperature on microstructure of fly ash-cement paste
KURUMISAWA Kiyofumi, NAWA Toyoharu, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2005, 425, 426, 31 Jul. 2005
Architectural Institute of Japan, Japanese - 反射電子像およびエネルギー分散型X線分析によるセメントの構成化合物の測定
胡桃澤 清文, 第59回セメント技術大会講演要旨, 4, 5, 2005 - 1005 硬化セメントペーストの空隙構造から見た塩化物イオン移動(材料・施工)
胡桃澤 清文, 田中 享二, 研究報告集 I, 材料・施工・構造・防火・環境工学, 73, 17, 20, Feb. 2003
日本建築学会, Japanese - 428 コンクリート部材の位置の影響(コンクリート物性・施工)(一般セッション)
胡桃澤 清文, 田中 享二, 麻原 秀一, 塚越 弘幸, 学術講演会講演論文集, 52, 361, 362, 2003
日本材料学会, Japanese - 1110 Structure of Polymer-modified Cement Membrane Waterproofing
MATSUBARA Tomoko, TANAKA Kyoji, KURUMISAWA Kiyofumi, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 1, 253, 254, Aug. 2002
Architectural Institute of Japan, Japanese - 1364 Modeling of Pore Structure of Hardened Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 1, 761, 762, Aug. 2002
Architectural Institute of Japan, Japanese - 1009 硬化セメントペーストの空隙構造の画像化
胡桃澤 清文, 田中 享二, 研究報告集 I, 材料・施工・構造・防火・環境工学, 72, 33, 36, Feb. 2002
日本建築学会, Japanese - 1249 Development of Three Dimensional Observation Technique for Pore Structure in Hardened Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2001, 497, 498, 31 Jul. 2001
Architectural Institute of Japan, Japanese - Introduction of Three-Dimensional Visualization of Pore Structure in Cement-Basde Material
KURUMISAWA Kiyofumi, TANAKA Kyoji, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 2000, 789, 790, 31 Jul. 2000
Architectural Institute of Japan, Japanese - 2 セメント硬化体の細孔形態に水セメント比および材齢が与える影響(材料・施工,構造系)
胡桃澤 清文, 田中 享二, 研究報告集, 70, 129, 132, Feb. 2000
日本建築学会, Japanese - Development of Method for Pore shape and Destribution of Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 1999, 703, 704, 30 Jul. 1999
Architectural Institute of Japan, Japanese - コンクリートの凍害に関する研究 : その5 コンクリート中に存在する凍結水の融解に関する実験的研究(構造・材料系)
松村 光太郎, 胡桃澤 清文, 川瀬 清孝, 日本建築学会北陸支部研究報告集, 41, 27, 30, Aug. 1998
日本建築学会, Japanese - Experimental study on thawing of frozen water in concrete
MATSUMURA Kotaro, KURUMIZAWA Kiyofumi, KAWASE Kiyotaka, Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 1998, 389, 390, 30 Jul. 1998
Architectural Institute of Japan, Japanese
Books and other publications
- ジオポリマーコンクリートのナノ構造解析手法の開発—Development of nanostructure analysis method for geopolymer concrete
胡桃澤 清文
東京 : 大成学術財団, 2024, Japanese - エマルジョンとナノ粒子による高炉スラグ硬化体の初期強度・耐凍害性の改善
名和豊春, 胡桃澤清文, ELAKNESWARAN Y., 佐川孝広, 西祐宜
2020 - 物理化学的解釈に基づく電気化学的計測手法の体系化に関する研究委員会報告書
小林浩之, 山本悟, 金田尚志, 細川佳史, 高谷哲, 兼松学, 宮里心一, 胡桃澤清文, 皆川浩, 中村英佑, 福山智子, 伊代田岳史, 岡崎慎一郎, 染谷望, 東洋輔, 花岡大伸, 親本俊憲, 山本誠
2015
Lectures, oral presentations, etc.
- ケイ酸カルシウム水和物の解析的手法による機械的物性の推定
村上創一朗, 胡桃澤清文
セメント技術大会講演要旨(CD-ROM), 2023
2023 - 2023 - 亜硝酸カルシウムを使用した高炉セメント硬化体の温度依存性
胡桃澤清文
セメント技術大会講演要旨(CD-ROM), 2023
2023 - 2023 - Chemical state of geopolymers by XAFS measurement
胡桃澤清文
KEK Progress Report (Web), 2023
2023 - 2023 - Microstructure of metakaolin based geopolymer measured by NMR, XAFS, TEM and proton NMR
胡桃澤清文
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), 2023
2023 - 2023 - Impact of curing temperature and additional activators on the hydration of Ca(OH)2 activated GGBFS
ZHAI Qi, 胡桃澤清文
セメント技術大会講演要旨(CD-ROM), 2022
2022 - 2022 - Effect of calcium nitrite on properties of concrete
胡桃澤清文
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), 2022
2022 - 2022 - Study on Ca/Si Ratio of C-S-H in ASR suppressing effect of fly ash
齋藤敏樹, 山城洋一, 坂本久宣, 八幡正弘, 杉山隆文, 胡桃澤清文
土木学会全国大会年次学術講演会(Web), 2022
2022 - 2022 - コンクリート工学におけるシミュレーションの検証と妥当性確認および不確かさ評価に関するシンポジウム 委員会報告書
上田尚史, 上田尚史, 岡崎慎一郎, 車谷麻緒, 山本佳士, 川口和広, 上田尚史, 山本佳士, 坂敏秀, 山下拓三, 車谷麻緒, 藤本篤, 車谷麻緒, 車谷麻緒, 上田尚史, 車谷麻緒, 坂敏秀, 上田尚史, 山本佳士, 上田尚史, 車谷麻緒, 山本佳士, 淵澤健一, 川口和広, 山下拓三, 坂敏秀, 上田尚史, 小倉大季, 坂敏秀, 上田尚史, 車谷麻緒, 山本佳士, 淵澤健一, 川口和広, 坂敏秀, 上田尚史, 小倉大季, 上田尚史, 小倉大季, 上田尚史, 小倉大季, 岡崎慎一郎, 上田尚史, 岡崎慎一郎, 塚越雅幸, 五十嵐豪, 胡桃澤清文
日本コンクリート工学会委員会報告書・論文集(CD-ROM), 2022
2022 - 2022 - Effect of inorganic salt on drying shrinkage of blast furnace slag composite
胡桃澤清文
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 - 2021 - 繊維入り高強度高緻密コンクリートの透水性評価
酒本琴音, 加藤昌治, 石井祐輔, 胡桃澤清文
資源・素材学会北海道支部春季講演会講演要旨集(CD-ROM), 2021
2021 - 2021 - エマルジョンとナノ粒子による高炉スラグ硬化体の初期強度・耐凍害性の改善
名和豊春, 胡桃澤清文, ELAKNESWARAN Y., 佐川孝広, 西祐宜
環境助成研究成果 概要集 第38回・2017年度分:11件 第39回・2018年度分:23件 令和2年度, 2020
2020 - 2020 - 高炉スラグ微粉末の反応に及ぼす無機塩の影響
胡桃澤清文
セメント技術大会講演要旨(CD-ROM), 2020
2020 - 2020 - 無機塩類が高炉スラグ硬化体の強度発現に及ぼす影響
大松宏彰, 山田優也, 胡桃澤清文
セメント技術大会講演要旨(CD-ROM), 2020
2020 - 2020 - 1012 硬化促進剤および凍害劣化抑制剤が高炉セメントコンクリートの耐凍害性に及ぼす影響
小沢 優也, 胡桃澤 清文, 佐川 孝広, 谷口 円, 安田 玲子, 西 祐宜, 猪瀬 亮
材料施工, 20 Jul. 2019, 日本建築学会, Japanese
20 Jul. 2019 - 20 Jul. 2019 - 1164 高炉スラグ硬化体の強度発現に及ぼす水和促進剤の影響
胡桃澤 清文
材料施工, 20 Jul. 2019, 日本建築学会, Japanese
20 Jul. 2019 - 20 Jul. 2019 - 硬化促進剤および凍害劣化抑制剤が高炉セメントコンクリートの耐凍害性に及ぼす影響
小沢優也, 猪瀬亮, 安田玲子, 西祐宜, 谷口円, 佐川孝広, 胡桃澤清文
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), 20 Jul. 2019, Japanese - メタカオリンを原料としたジオポリマーの創製
胡桃澤清文, 小島真実
資源・素材(Web), 2019
2019 - 2019 - 汚染水処理から発生する使用済み合成ゼオライト及びチタン酸塩の長期保管における固化マトリックスとしてのジオポリマーの適用性
戸田賀奈子, SOONTHRONWIPHAT Natatsawas, TWO Hnin Wint Wint, 小林佑太朗, 黒田知眞, 森永祐加, 胡桃澤清文, YOGARAJAH Elakneswaran, 杉山隆文, KE Xinyuan, PROVIS John, 佐藤努
日本原子力研究開発機構JAEA-Review(Web), Dec. 2018, Japanese - プロトンNMRによるセメント硬化体の空隙構造測定
胡桃澤清文
Abstracts. Annual Meeting of the NMR Society of Japan, 03 Sep. 2018, Japanese - モルタルの溶脱に伴う拡散係数変化に関する検討(1)溶脱試料の物性評価
柴田真仁, 芳賀和子, 胡桃澤清文, 林大介, 井田雅也
日本原子力学会秋の大会予稿集(CD-ROM), 20 Aug. 2018, Japanese - モルタルの溶脱に伴う拡散係数変化に関する検討(2)Ca溶脱後のモルタルの拡散係数予測モデル
胡桃澤清文, 井田雅也, 林大介, 柴田真仁, 芳賀和子
日本原子力学会秋の大会予稿集(CD-ROM), 20 Aug. 2018, Japanese - Ca溶脱に伴う吸着性能変化を考慮した混合セメント硬化体の物質移動予測モデルの構築
宮本正紀, 杉山卓也, 胡桃澤清文, 名和豊春
セメント技術大会講演要旨(CD-ROM), 30 Apr. 2017, Japanese - 収縮低減剤の使用によるセメントペーストの水和反応に及ぼす影響
鳴海玲子, 松沢友弘, 西祐宜, 胡桃澤清文
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), 20 Jul. 2016, Japanese - カルシウム溶脱がフライアッシュセメント硬化体の塩化物イオン吸着性能に及ぼす影響
宮本正紀, 杉山卓也, 胡桃澤清文, 名和豊春
セメント技術大会講演要旨(CD-ROM), 30 Apr. 2016, Japanese - サーモポロメトリー法を用いた空隙構造測定に基づくフライアッシュセメント硬化体の物性評価
杉山卓也, 宮本正紀, 胡桃澤清文, 名和豊春
セメント技術大会講演要旨(CD-ROM), 30 Apr. 2016, Japanese - Influence of surface electrical properties of C–S–H on chloride binding in slag–blended cementitious materials
Elakeswaran Yogarajah, Toyoharu Nawa, Kiyofumi Kurumisawa
Sustainable Construction Materials and Technologies, 01 Jan. 2016
© 2016 International Committee of the SCMT conferences. All rights reserved. Knowledge on interface characteristics of C–S–H is important to understand the adsorption and transport behavior of ionic species into cementitious materials. In this study, the surface electrical properties of C–S–H and their influence on ionic adsorption have been investigated to be able to predict chloride binding on slag containing materials. The experimental data showed that the surface charge or electrokinetic potential of slag cement paste (SCP) are intermediate between Portland cement paste and C–S–H with Ca/Si of 1.0. The surface site density of the C–S–H and the associated equilibrium constant value for dissociation are derived from potentiometric titration experiment and a surface complexation model. Further, the surface complexation modelling parameter for chloride adsorption on C–S–H with Ca/Si of 1.0 were estimated by fitting the experimental data to simulation results. The estimated parameters for C–S–H together with surface complexation modelling parameters for Portland cement, which was derived and verified in a previous study, were used to predict the chloride binding on SCP. A batch experiment was performed to determine the total binding of chloride on SCP. It is considered that total binding of chloride is the amount of adsorbed chloride on the C–S–H surface as well as the chemical binding of chloride as Friedel’s salt. The simulation results on chloride binding show good agreement with experimental data, follows a Freundlich isotherm. When Portland cement is partially replaced by slag, it modifies the surface electrical properties of C–S–H in addition to mineralogy and pore structure and leads to change in the chloride binding behavior. - Effect of supplemental cementitious materials on electric conductivity and chloride ingress of hardened cement paste
Kiyfomi Kurumisawa, Toyoharu Nawa
Sustainable Construction Materials and Technologies, 01 Jan. 2016
© 2016 International Committee of the SCMT conferences. All rights reserved. It is necessary to improve transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. Measurement in electric conductivity by the AC impedance method is suggested as simple and easy technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with fly ash and blast furnace slag that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the fly ash cement paste (FAC) and blast furnace slag cement paste (BFSC) was investigated by the electric conductivity measurement. For measuring the electric conductivity the AC impedance method was applied, and backscattered electron image analysis and mercury intrusion method was used for measuring pore structure in FAC and BFSC. The relationship between porosity and the electric conductivity was expressed by the Archie’s law that is expressed with exponential function, and very high correlation was shown in chloride diffusion coefficient and electric conductivity regardless of fly ash and blast furnace slag replacement ratio. - 1162 Resistivity of hardened cement paste measured by two methods
KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of annual meeting, 04 Sep. 2015, Japanese - 1182 Effect of W/C and sand on electric conductivity of mortar
KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of annual meeting, 12 Sep. 2014, Japanese - 交流インピーダンス法を用いた凍結融解下におけるセメントペースト硬化体の空隙構造の解析
石垣邦彦, 胡桃澤清文, 名和豊春
セメント技術大会講演要旨(CD-ROM), 30 Apr. 2013, Japanese - Effect of microstructure and moisture content on the electric conductivity of hardened cement paste
Kiyofumi Kurumisawa, Toyoharu Nawa
Sustainable Construction Materials and Technologies, 01 Jan. 2013
© 2013 Sustainable Construction Materials and Technologies. All rights reserved. Investigations have been carried out to establish the electric characteristic and mass transport properties of hardened cement paste (HCP) by the AC impedance method. However, there are few studies considering the microstructure in HCP and the AC impedance method. In this study, the relationship between the electric conductivity measured by the AC impedance and microstructure in HCP was investigated, together with the effects of the moisture content in HCP on electric conductivity. Backscattered electron image analysis, the mercury intrusion method, and a water adsorption method were used to measure pore structure of the HCP. There was a strong correlation between relative humidity and the electric conductivity. It was shown that the electric conductivity is greatly influenced by the moisture content in HCP, at low relative humidities the conductivity is dependent on the surface area, and at high relative humidities the conductivity is dependent on the pore volume of the HCP. - 1378 Effect of moisture content on electric conductivity in hardened cement paste
KURUMISAWA Kiyofuim, NAWA Toyoharu
Summaries of technical papers of annual meeting, 12 Sep. 2012, Japanese - PREDICTION OF DIFFUSION COEFFICIENT IN LEACHED HARDENED CEMENT PASTE
2012 - EFFECT OF COARSE AGGREGATE ON MECHANICAL PROPERTIES OF ULTRA HIGH-STRENGTH CONCRTE
2012 - T0101-4-6 Digital-Image-Based Simulation for Compressive Strength Prediction of Hardened Cement Pastes
NAGAI Gakuji, KURUMISAWA Kiyofumi
年次大会講演論文集 : JSME annual meeting, 04 Sep. 2010, Japanese
To predict the macroscopic compressive strengths of hardened cement paste, a digital-image-based finite element procedure for damage evolution due to local tension is developed and its applicability from practical viewpoint is studied through numerical experiments. In the procedure, microscopic three-dimensional geometries of hardened cement paste are assumed to be periodic and each phase is randomly generated by using auto-correlation function evaluated from a two-dimensional SEM image of specimen. Nonlocal isotropic damage model is employed to represented crack evolutions in the geometries. Predicted macroscopic uni-axial compressive strengths are qualitatively consistent with experimental results in terms of water-cement ratio and material age. - T0101-4-6 Digital-Image-Based Simulation for Compressive Strength Prediction of Hardened Cement Pastes
NAGAI Gakuji, KURUMISAWA Kiyofumi
年次大会講演論文集 : JSME annual meeting, 04 Sep. 2010, Japanese - 1637 Pore structure of cement based materials measured by backscattered electron image and mercury intrusion method
KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 20 Jul. 2010, Japanese - Nonlocal Damage Evolution Simulation of Cement Pastes for Compressive Strength Prediction
永井 学志, 池田 翔太, 胡桃澤 清文
計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science, May 2010, Japanese - Prediction of ionic adsorption and multi–ionic transport in cementitious materials
Elakneswaran Yogarajah, Nawa Toyoharu, Sato Tsutomu, Kurumisawa Kiyofumi, Iwasa Akihito
Proceedings of AESJ, 2010, Japanese
Cementitious materials are being used for encapsulation, back filling, and grouting purposes in deep geological repositories of long – lived radioactive waste. The long – term performance of cementitious materials has been investigating for safety disposal of radioactive waste. The durability performance of cementitious materials is mainly determined by resistance to transport of aggressive substances, however remain poorly understood. In this study, a thermodynamic integrated model has been developed to simulate multi-ionic transport in cementitious materials with considering ionic adsorption. The model has been validated against measured experimental data. - Sustainable development in construction toyoharu nawa
Toyoharu Nawa, Kiyofumi Kurumisawa
Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010, 01 Jan. 2010
Sustainable development is a major driver for future innovations and prospects for development of new construction materials with lower environmental impact. The use of industrial by-products in construction is very favourable to the sustainable development of our modern society. This article presents the situation of the sustainable recycling system of construction in Japan; In 2007 Japanese cement industry produced about 50 million tons of cement, and also used about 27 million tons of waste and by-products as alternative raw materials and fuel. Thus at present the construction industry can becomc the core of artificial ecosystem. Further eco-cement, which is made from municipal waste incineration ash and sewage sludge have been developed in Japan. ©2010 by Hokkaido University Press All rights reserved. - Micro elastic modulus of blended cement pastes
K. Kurumisawa, T. Nawa, Y. Hirukawa
Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures, 01 Dec. 2009
For improving the properties of concrete, fly ash and Blast furnace slag (BFS) is mixed with ordinary Portland cement (OPC). These blended concrete has a high resistance to chloride ingress by reducing large pores at later age. This is because fly ash and BFS is reacted with calcium hydroxide and then produce calcium silicate hydrate (C-S-H) gel which expand in cement matrix. It was well known that blended concrete has advantages such as low porosity and low calcium hydroxide content. However, the properties of C-S-H in blended concrete are not cleared well because its structure is changed with mineral admixtures. To understand the structure of C-S-H is important for predicting the properties of concrete. Recently, to determine the mechanical property of C-S-H, nano-indentation method is applied for hardened cement paste by Ulm et al. In their study, this method is only applied for OPC only or degraded OPC until now. Therefore, we applied this method for measuring the elastic modulus of blended hardened cement paste and also measured compositions of blended cement paste by backscattered electron image. As a result, the elastic modulus of HCP mixed with fly ash is lower than that of HCP only. It is indicated that the elastic behavior of C-S-H in blended cement is different from that in OC. © 2009 Taylor & Francis Group. - 1392 Micro Mechanics of Ultra High Strength Cement Paste
JEON Jin-Hwan, MOMOSE Haruki, KANDA Tetsuji, KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 20 Jul. 2009, Japanese - Sustainable Development in Construction-Eco-cement and Recycled Aggregate
NAWA TOYOHARU, KURUMISAWA KIYOFUMI
Eco Des, 2009, English - An integrated model to predict the relations between electrical double layer properties and chloride ingress in cement - Based materials
Y. Elakneswaran, T. Nawa, K. Kurumisawa
RILEM Workshop on Long-Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants, NUCPERF 2009, 01 Jan. 2009
The mechanisms of the transport of species into the cementitious material have lately received a great deal of attention in durability problems. Hydrated cement acquires an electrical charge when it contacts with polar medium and leads to formation of Electric Double Layer (EDL). In this study, the significant influence of EDL properties on ionic transport through cement - based materials was investigated. Hardened cement paste shows net positive surface charge due to ionization of surface sites and adsorption ions from pore solution. EDL properties such as surface charge significantly influence not just on ionic adsorption but also on ionic diffusion. An integrated modelling approach employing phase - equilibrium model, surface complexation model, and multicomponent diffusion model was developed using PHREEQC to simulate the ionic ingress through cement - based materials. A comparison of predicted and experimental chloride profile is presented for hydrated cement paste. The surface charge influence is much higher on ionic transport in gel pore as compared in other pores. Chloride is being held in chemical combination as Friedel's salt and also bound mainly by adsorptive action of cement hydrates. Finally, an influence of pozzolanic materials on chloride binding (chemical as well as physical) and diffusion is discussed. - STUDY OF CEMENTITIOUS MATERIALS BY X-RAY DIFFRACTION/RIETVELD ANALYSIS
KURUMISAWA Kiyofumi
セメントコンクリート, 10 Nov. 2008, Japanese - B19 粘土とセメントの相互作用に関するXAFSを用いた研究(口頭発表,一般講演)
沼子 千弥, 坂本 浩幸, 芳賀 和子, 柴田 真仁, 大和田 仁, 黒澤 進, 山田 憲和, 中澤 俊之, 佐藤 努, 胡桃澤 清文, 安楽 総大郎
粘土科学討論会講演要旨集, 03 Sep. 2008, Japanese - THE RELATIONS BETWEEN ELECTROCHEMICAL PROPERTIES AND CHLORIDE DIFFUSION IN CEMENT-BASED MATERIALS
ELAKNESWARAN Yogarajah, NAWA Toyoharu, KURUMISAWA Kiyofumi
セメント技術大会講演要旨, 20 May 2008, English - XAFS Study for interaciton between clayminerals and cements
Numako Chiya, Kurumizawa Kiyofumi, Anraku Sotaro, Sakamoto Hiroyuki, Haga Kazuko, Shibata Masahito, Ohwada Hitoshi, Kurosawa Susumu, Yamada Norikazu, Nakazawa Toshiyuki, Sato Tsutomu
Abstracts of annual meeting, 2008, Japanese
放射性廃棄物の地層処理に関して人工バリアとして設計されているベントナイトとセメントの相互作用を評価するために、放射光を用いたXAFS分析を適用した。XAFS測定は高エネルギー物理学研究機構物質構造科学研究所放射光実験施設Photon FactoryのBL9Aにおいて行った。試料としては合成CSHと種々の粘土鉱物、また人工バリア模擬体を３年程度浸水実験した試験片に対して行った。その結果、XAFS法が試料中のCaの化学形の決定及びベントナイトーセメント相互作用の評価に有用であることが解った。 - EFFECT OF MICROSTRUCTURE ON DYNAMIC ELASTIC MODULUS OF HARDENED CEMENT PASTE
2008 - INFLUENCE OF ELECTROLYTES ON ZETA POTENTIAL OF PASTES
ELAKNESWARAN Yogarajah, NAWA Toyoharu, KURUMISAWA Kiyofumi, HAYASHI Ami
セメント技術大会講演要旨, 20 May 2007, English - Strength development and its microstructure of ECO-cement paste
2007 - 1193 Measurement of elasticity of hydrated cement paste by micro indentation
KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 31 Jul. 2006, Japanese - Nondestructive Measurement of Chloride Content in Concrete Structure by Electromagnetic Radar
NAWA T, KURUMISAWA K
コンクリート工学 = Concrete journal, 01 May 2006, Japanese - 1213 Effect of curing temperature on microstructure of fly ash-cement paste
KURUMISAWA Kiyofumi, NAWA Toyoharu
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 31 Jul. 2005, Japanese - 428 コンクリート部材の位置の影響(コンクリート物性・施工)(一般セッション)
胡桃澤 清文, 田中 享二, 麻原 秀一, 塚越 弘幸
学術講演会講演論文集, 16 May 2003, Japanese - 1364 Modeling of Pore Structure of Hardened Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 02 Aug. 2002, Japanese - 1110 Structure of Polymer-modified Cement Membrane Waterproofing
MATSUBARA Tomoko, TANAKA Kyoji, KURUMISAWA Kiyofumi
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 02 Aug. 2002, Japanese - 1249 Development of Three Dimensional Observation Technique for Pore Structure in Hardened Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 31 Jul. 2001, Japanese - Introduction of Three-Dimensional Visualization of Pore Structure in Cement-Basde Material
KURUMISAWA Kiyofumi, TANAKA Kyoji
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 31 Jul. 2000, Japanese - Development of Method for Pore shape and Destribution of Cement Paste
KURUMISAWA Kiyofumi, TANAKA Kyoji
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 30 Jul. 1999, Japanese - コンクリートの凍害に関する研究 : その5 コンクリート中に存在する凍結水の融解に関する実験的研究(構造・材料系)
松村 光太郎, 胡桃澤 清文, 川瀬 清孝
日本建築学会北陸支部研究報告集, 01 Aug. 1998, Japanese - Experimental study on thawing of frozen water in concrete
MATSUMURA Kotaro, KURUMIZAWA Kiyofumi, KAWASE Kiyotaka
Summaries of technical papers of Annual Meeting Architectural Institute of Japan. A-1, Materials and construction, 30 Jul. 1998, Japanese
Courses
Research Themes
- Mechanism of Frost Damage of Blended Cement Concrete Considering Nanostructure and Moisture State in Pore
Grants-in-Aid for Scientific Research
01 Apr. 2024 - 31 Mar. 2027
胡桃沢 清文
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 24K07745 - 高炉スラグ微粉末及びフライアッシュセメントコンクリートの反応促進技術の開発
科学研究費助成事業 基盤研究(C)
01 Apr. 2021 - 31 Mar. 2024
胡桃沢 清文
コンクリート製造時には多くのセメントを使用することからセメント製造時のCO2排出は避けらることができない。そこでセメントの一部を高炉スラグ微粉末やフライアッシュに置換した混合セメントコンクリートのさらなる利用が求められている。混合セメントコンクリートは長期的には普通コンクリートと同等の性能を示すが、初期強度発現がセメントのみと比べると低く、施工期間が長期化するためさらなる利用が制限されている。そのため混合セメントコンクリートの初期反応を活性化させ強度発現を促す混和剤の開発が求められている。そこで本研究では混合セメント中の高炉スラグ微粉末やフライアッシュの初期反応を活性化させる硬化促進剤の開発を行った。特に本年度においては無機塩が高炉スラグやフライアッシュの反応に及ぼす影響に関して開発を行った。高炉スラグとフライアッシュの反応性を明らかにするために水酸化カルシウムを刺激剤とする硬化体の作製を行った。さらに硬化促進剤の混和材への作用メカニズムを選択溶解法や固体NMRを用いて微視的視点から明らかにした。また、強度発現、拡散性能、収縮特性に関して硬化促進剤を加えた試験体に関して検討をおこなった。その結果、無機塩を加えた試料では強度発現が促進された。高炉スラグやフライアッシュの反応は、イオンの移動速度が反応促進に大きく影響を及ぼすことを明らかにした。また、高炉スラグやフライアッシュの溶解に伴いアルミネート系の水和物が初期の強度発現に影響を及ぼすことを明らかにした。
日本学術振興会, 基盤研究(C), 北海道大学, 21K04349 - 水分状態に基づく混合セメントコンクリートの凍害劣化予測モデルの構築
鹿島学術振興財団研究助成
2022 - 2023 - 流動性と収縮特性を改善したメタカオリンジオポリマーの開発
前田記念工学振興財団研究助成
2022 - ジオポリマーコンクリートのナノ構造解析手法の開発
大成学術財団 2022年度研究助成
2022 - 細孔内水分状態に基づく高耐久性メタカオリンジオポリマーの開発
(公財)大林財団 2022年度研究助成
2022 - 高炉スラグ固化体作製のための高炉スラグの反応促進技術の開発
鉄鋼環境基金環境助成研究
2019 - 2021 - ジオポリマー技術による人工バリア構築のための基礎的検討
放射性廃棄物に係る重要な基礎的技術に関する研究調査の支援等に関する業務
2018 - 2020 - 無機・有機混和剤による高炉スラグ微粉末の反応促進
前田記念工学振興財団研究助成
2020 - Development of frost resiste concrete in cold region
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
01 Apr. 2016 - 31 Mar. 2019
Nawa Toyoharu, Nishi Hironobu
In this study, we aimed to evaluate initial strength development and scaling resistance of blast furnace slag cement concrete using accelerator and frost damage inhibitor. As a result, it has been clarified that the scaling resistance is improved in blast furnace slag cement concrete added with an appropriate amount of air and a frost damage inhibitor. In addition, it has been confirmed that the development of the initial strength of blast furnace slag cement concrete using a nitrite-based accelerator is improved. From above mentioned, it was possible to clarify from this study that the combination of accelerator and frost damage inhibitor can improve the initial strength development and the scaling resistance of blast furnace slag cement concrete.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 16H04443 - Development of pore structure analysis method for cement based materials
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
01 Apr. 2016 - 31 Mar. 2019
Kurumisawa Kiyofumi
I developed a method to measure the pore structure of concrete. There are many pores in concrete, and their compressive strength and transport properties differ depending on pore size distribution. Therefore, it is very important to clarify the pore size distribution in concrete. Pore size distribution is clarified by the thermoporometry method of measuring the amount of pore from the heat quantity generated during freezing and thawing of the water present inside the pore, and the proton NMR measurement focusing on the mobility of hydrogen. It became clear by this method that the distribution of the water present in the pore is greatly different between blended cement paste and ordinary cement paste.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 16K06563 - 初期反応性を高めた高炉スラグ固化体の創製
(公財)大林財団 2019年度研究助成
2019 - 寒冷地におけるジオポリマー硬化体の製造技術の開発
北海道ガス大学研究支援制度
2019 - 空隙水の存在状態に基づく混合セメント硬化体の空隙構造の解明と拡散性能評価
日本コンクリート工学会研究助成
2018 - プロトンNMRによる混合セメントコンクリートの凍害発生メカニズムの解明
公益財団法人 LIXIL住生活財団調査研究助成
2017 - 産業副産物を用いたコンクリート舗装の物性と環境影響評価
Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
25 Apr. 2014 - 31 Mar. 2016
胡桃沢 清文, JAMSHIDI ALI, JAMSHIDI Ali
昨年度行ったモルタルの圧縮強度と弾性係数の実験結果に基づき異なる2種類のコンクリート舗装についての設計を行い、同時に養生温度の影響についても検討を行った。使用した産業副産物の種類、混和量、養生条件について燃料消費と温暖化ガスの排出の観点から分析を行った。原材料の製造過程、練り混ぜ、打ち込みのすべてに関して高速道路と滑走路のコンクリート舗装に関して検討を行った。特に原材料製造過程においては、セメント、フライアッシュ、高炉スラグ微粉末、水、鉄筋のすべてについて考慮した。コンクリート舗装の構造性能の設計に関しては、アメリカの基準であるAASHTOの設計手法に従って行った。また、滑走路の舗装に関しては、ボーイング787を想定した設計を行った。その結果、養生温度の上昇はほとんどの場合、舗装スラブの厚さを低減することが可能であることを明らかにした。そしてフライアッシュや高炉スラグ微粉末などの産業副産物を使用した舗装は構造性能の観点から混和していない舗装と比較して同程度もしくはそれ以上の性能を示すことを明らかにした。また、高温養生においては製造時にエネルギーを多く消費するが、舗装の供用期間を考慮すると総エネルギーは減少することを示した。
さらに建設時の遅延の影響について検討を行った。これは養生温度を上昇させる際の環境負荷を検討したものであり、この結果、高速道路と滑走路の舗装建設が遅延した場合には多くのエネルギー消費が増加することを定量的に示した。以上より産業副産物の利用や、養生温度の違いなどを環境負荷の観点と構造性能を合わせて定量的に評価するモデルを構築することができた。
Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Hokkaido University, 14F04058 - Transport property of hardened cement paste based on surface chemistry
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
01 Apr. 2013 - 31 Mar. 2016
Kurumisawa Kiyofumi
In this study, the effect of microstructure on transport properties of hardened cement paste was investigated. Hardened cement paste mixed with inorganic electrolytes, blast furnace slag, and fly ash was investigated, and it was found that Calcium silicate hydrate(C-S-H) and pore solution composition had an influence on the transport properties as well as pore structure. The chloride adsorption ability of the hardened cement paste during calcium leaching decreased remarkably in comparison with before leaching, and it was clarified that the adsorption ability of C-S-H is depended on the Ca/Si ratio of C-S-H in the blended cement.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Competitive research funding, 25420565 - 画像解析によるジオポリマーの反応速度測定と混和剤の開発
産学が連携した研究開発成果の展開 研究成果展開事業 マッチングプランナープログラム
2016 - 2016
胡桃沢 清文
科学技術振興機構, 北海道大学 - 熱力学相平衡を考慮した混合セメント硬化体の物質移動モデルの構築
鹿島学術振興財団研究者交流援助助成
2016 - ジオポリマー技術によるコンクリートのCO2排出低減化
大林財団研究助成
2016 - Enhanced analysis for early age hydration of cement using Si-NMR and high-speed and ultrasensitive XRD
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
01 Apr. 2012 - 31 Mar. 2014
NAWA Toyoharu, KURUMISAWA Kiyofumi
When industrial waste is utilized as the raw material for cement, C3A, which is a mineral of four major constitutes of cement increases because the industrial waste condenses high amount of aluminum. In this study, the hydration behavior of C3A, of which hydration rate is very fast, was in- vestigated by using a high-speed, ultra-sensitive XRD in combination of amorphous phase analysis with 27Al MAS NMR, and elucidated the reaction mechanism of C3A in more detail using thermodynamic phase equilibri-um and surface complexation models. The change in properties of C-S-H formed by the hydration reaction of C3S with the increase of Al content in the cement was also analyzed by using 29Si MAS NMR. In addition, the influence of increase of C3A content on the fluidity of cement paste was also investigated to evaluate the limitation of industrial waste usage in cement production.
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 24656317 - 比抵抗測定によるかぶりコンクリートの物質移動特性評価
戸田育英財団研究助成金
2014 - Modeling of transport of ion in hardened cement paste with thermodynamics
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2011 - 2012
KURUMISAWA Kiyofumi
The purpose of this study is to predict the transport of ion in the hardened cement paste that calcium leaching occurred quantitatively. Furthermore, the mass transfer prediction model was improved by incorporating the phase equilibrium of solid-liquid interaction and3-dimensional spatial image model. As a result, it is possible to predict the transport of ion by the proposed prediction model. The AC impedance method that is simple and non-destructive measurement was applied to measure the transport properties of hardened cement paste, it is clarified that the relationship between the measured conductivity by AC impedance and diffusion coefficient of hardened cement paste was in good agreement.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, Principal investigator, Competitive research funding, 23760513 - Technological development for reducing shrinkage cracking in cold climates
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2010 - 2012
NAWA Toyoharu, KURUMISAWA Kiyofumi, ASAMOTO Singo
For technological development of shrinkage cracking suppression in cold climates, we have elucidated the frost damage degradation mechanisms and drying shrinkage reduction of shrinkage reducing agent, and developed a new shrinkage reducing agent (SRA) with improved freeze-thaw resistance. In addition, our shrinkage reducing agents had been optimized the molecular structure of shrinkage reducing agent according to an integrated model for the freezing and thawing action deterioration and drying shrinkage. In laboratory we examined the properties of fresh and hardened concrete such as workability, setting, mechanical properties, drying shrinkage, carbonation, rebar corrosion and the freeze-thaw resistance, and confirmed that the properties of SRA concrete were equivalent to those of concrete without SRA. Finally, we had also manufactured SRA concrete at ready-mixed concrete plant and fabricated in the actual structures, and confirmed that the performance of SRA concretes satisfied the target requirements.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 22360220 - Image based modeling of blended cementitious materials
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2009 - 2010
KURUMISAWA Kiyofumi
The section of the hardened cement paste was observed by a backscattered electron image to predict the properties of cementitious materials with mineral admixtures and quantified its microstructure by an autocorrelation function with the quantity of each phase. A three-dimensional image model was built by the supposition that each phase was distributed in the three-dimensional space in isotropic homogeneity based on them at random. Diffusion performance and mechanical properties of the hardened cement paste with this three-dimensional image model was calculated. As a result, about the diffusion performance, it was able to predict diffusivity of the hardened cement paste by using the value that it was based on a study in the past from the value that measured diffusivity of hydrates by micro-indentation method and estimated. In addition, the elastic modulus of hydrates was estimated from a stress-strain curve of the hardened cement paste reversely and it was shown that elastic modulus of hydrates is a function of the porosity and clarified that fracture criterion of hydrates was about 1,000μ regardless of curing age and the water cement ratio.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, Competitive research funding, 21760425 - 多孔体のキャラクタリゼーション
2008
Competitive research funding - 多孔体の3次元モデリング
2008
Competitive research funding - Modelling of porous media
2008
Competitive research funding - コンクリート構造物の耐久性
2007
Competitive research funding - セメント硬化体の精密微細モデル構築とひび割れ中の物質透過性の推定
Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
2005 - 2006
胡桃澤 清文
本研究では、セメントの硬化過程における構造、構成化合物の組成がどのようなものであるかを視覚的に明らかにし、それぞれの組成が物性にどのような影響を与えるかについて検討を行った。
(1)普通、低熱、早強ポルトランドセメントの粉体から、それに含まれている構成化合物量の測定を行う手法を開発した。その手法は、反射電子像とエネルギー分散型X線分析により得られた元素分布像を組み合わせて解析することにより、エーライト、ビーライト、アルミネート及びフェライト相の分布及びそれらの量を明らかにするものである。その手法を用いた結果、以前から指摘されているようにボーグ式と異なる傾向を示し、本手法により直接的にセメントの構成化合物量の測定が可能であることが示された。
(2)(1)で提案した手法を用いて硬化セメントペーストを測定及び解析をした結果、強度発現には画像解析で測定可能な粗大な空隙が大きく影響を及ぼしていることを明らかにした。さらに未水和セメント粒子から水和反応率を測定することを可能とし、硬化セメントペースト中の水酸化カルシウム量、CSH量、空隙量、未水和セメント量を定量的に表すことを可能とした。
(3)また、画像解析から得られた水和セメントペースト中の相組成とXRDリートベルト法により測定した相組成では未反応セメント量はほぼ同じ値であり、セメント水和率に関してもほぼ同じ値であった。この傾向はエコセメントを用いた場合においても同様であることを確認した。
(3)定量的に明らかにしたそれぞれの組成からセメント硬化体中の塩分浸透性について検討した結果、同じ空隙率であればCSHゲルを含む水和生成物量が多いほど塩分浸透性は低下することを明らかにした。
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, Principal investigator, Competitive research funding, 17760446 - リートベルト法によるセメント硬化体の構成化合物測定とコンクリート強度に与える影響
セメント協会研究助成
2005 - 各種微粉末混和材の成分がセメント硬化体の微細構造及び水和率に与える影響と強度発現及び物質透過性との関係
前田記念工学振興財団研究助成
2005 - セメント硬化体の微細構造とその物性
1998
Competitive research funding
