Hydration Characteristics of Composite Cementitious System Driven by Chemistry and Thermodynamics

Abstract

Abstract: In order to understand the hydration heat release characteristics of the composite cementitious material system, and the influence of chemical and thermodynamic driving on the hydration heat release of the composite cementitious material system, the development ofhydration heat of the binary composite cementitious system of fly ash- or slag-cement with different content was studied. At the same time, the influence of different harden accelerator content and different temperatures on the hydration heat release of the fly ash-cement binary composite cementitious system was explored. The results show that both fly ash and slag can reduce the hydration heat release rate of the binary composite cementitious system, but the activity of slag is higher than that of fly ash, which has little effect on the hydration heat release rate and the final cumulative heat release. Chemical driving can significantly increase the rate of hydration heat release of the system and promote the development of early hydration, but it does not change the final cumulative heat release. The thermodynamic driving effect is more significant, which greatly increases the heat release curvature of the system and the cumulative heat release. Using the chemical reaction rate as the criterion to establish a connection between the two driving forces can effectively design the hybrid driving mode.

Key words: composite cementitious system, hydration heat, chemical drive, thermodynamic drive, chemical reaction rate

CLC Number:

TB333

ZHANG Xiuzhen, LIU Zhichao, HE Yongjia, HU Shuguang, ZENG Bo. Hydration Characteristics of Composite Cementitious System Driven by Chemistry and Thermodynamics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1462-1469.

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