CONCRETE LIBRARY OF JSCE NO. 28, DECEMBER 1996 MULTI-COMPONENT MODEL FOR HYDRATION HEATING OF PORTLAND CEMENT (Translation from Proceedings of JSCE, No. 526/V-29, November 1995) Toshiharu KISHI Koichi MAEKAWA In checking the durability of a concrete structure, effective material design depends on being able to represent the characteristics of the materials being used in generalized form. In particular, the analysis of temperature stress requires a hydration heat model of the cement which is applicable to any given conditions. This study proposes a model of hydration heating that describes the hydration reactions of cement in terms of the reactions of individual mineral components of the cement and expresses the differences between various types of Portland cement as differences in mineral composition. The rate of hydration heat generation for each mineral component is expressed using two material functions: a reference heat generation rate at constant temperature and the thermal activity. Taking into account the temperature dependence of individual mineral component's reactions, the exothermic behavior of the cement as a whole during hydration is quantified for any given temperature history. The proposed model has been verified through analysis of adiabatic and semi-adiabatic temperature rises. Keywords: clinker minerals. hydration. heat generation. rnulti-component model, durability design Toshiharu Kishi is a lecturer in the Department of Civil Engineering at the University of Tokyo, Tokyo, Japan. He obtained his D.Eng. from the University of Tokyo in 1996. His research interests include thermal stresses on mass concrete and the evaluation of the temperature rises. He is a member of the J SCE and the JCI. Koichi Maekawa serves as professor in the Department of Civil Engineering at the University of Tokyo, Tokyo, Japan. He obtained his D.Eng. from the same university in 1985. He specializes in nonlinear mechanics and the constitutive laws of reinforced concrete, the seismic analysis of structures, and concrete thermodynamics. He is a member of the J SCE and the JCI.
MULTI-COMPONENT MODEL FOR HYDRATION HEATING OF PORTLAND CEMENT
Jul 14, 2022
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(Translation from Proceedings of JSCE, No. 526/V-29, November 1995)
Toshiharu KISHI Koichi MAEKAWA
In checking the durability of a concrete structure, effective material design depends on being able to represent the characteristics of the materials being used in generalized form. In particular, the analysis of temperature stress requires a hydration heat model of the cement which is applicable to any given conditions. This study proposes a model of hydration heating that describes the hydration reactions of cement in terms of the reactions of individual mineral components of the cement and expresses the differences between various types of Portland cement as differences in mineral composition. The rate of hydration heat generation for each mineral component is expressed using two material functions: a reference heat generation rate at constant temperature and the thermal activity. Taking into account the temperature dependence of individual mineral component's reactions, the exothermic behavior of the cement as a whole during hydration is quantified for any given temperature history. The proposed model has been verified through analysis of adiabatic and semi-adiabatic temperature rises.
Keywords: clinker minerals. hydration. heat generation. rnulti-component model, durability design
Toshiharu Kishi is a lecturer in the Department of Civil Engineering at the University of Tokyo, Tokyo, Japan. He obtained his D.Eng. from the University of Tokyo in 1996. His research interests include thermal stresses on mass concrete and the evaluation of the temperature rises. He is a member of the JSCE and the JCI.
Toshiharu KISHI Koichi MAEKAWA
In checking the durability of a concrete structure, effective material design depends on being able to represent the characteristics of the materials being used in generalized form. In particular, the analysis of temperature stress requires a hydration heat model of the cement which is applicable to any given conditions. This study proposes a model of hydration heating that describes the hydration reactions of cement in terms of the reactions of individual mineral components of the cement and expresses the differences between various types of Portland cement as differences in mineral composition. The rate of hydration heat generation for each mineral component is expressed using two material functions: a reference heat generation rate at constant temperature and the thermal activity. Taking into account the temperature dependence of individual mineral component's reactions, the exothermic behavior of the cement as a whole during hydration is quantified for any given temperature history. The proposed model has been verified through analysis of adiabatic and semi-adiabatic temperature rises.
Keywords: clinker minerals. hydration. heat generation. rnulti-component model, durability design
Toshiharu Kishi is a lecturer in the Department of Civil Engineering at the University of Tokyo, Tokyo, Japan. He obtained his D.Eng. from the University of Tokyo in 1996. His research interests include thermal stresses on mass concrete and the evaluation of the temperature rises. He is a member of the JSCE and the JCI.
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