Influence of Fineness Change of Limestone Powder-Fly Ash on Hydration Kinetics of Cement-Based Cementitious Material System

Abstract

Abstract: In order to analyze the influence of different fineness of limestone powder-fly ash on the hydration process and early mechanical properties of cement-based cementitious materials. In this study, isothermal calorimetry was used to determine the total heat release and heat release rate of composite binders with different fineness at 20 ℃. According to the hydration kinetic model proposed by Krstulovic-Dabic, the values of kinetic parameters for each stage of the hydration reaction were calculated. The results show that the increase fineness of limestone powder and fly ash will promote the crystal nucleation and crystal growth of the hydration products. At the same time, the increase of fineness will shorten the end time of hydration induction period and the time to reach the maximum exothermic rate, and accelerate the hydration reaction rate of cement. Limestone powder and fly ash refinement shorten the process time of phase boundary reaction. When the degree of hydration is higher, the reaction control mechanism in the cementitious material system changes. The compressive strength test shows that increasing the fineness can significantly improve the early strength of the mortar specimen, and the later strength remains stable.

Key words: limestone powder-fly ash, fineness, cementitious material, hydration reaction rate, hydration kinetic model, mechanical property

CLC Number:

TU528.44

CHENG Gaoli, LI Xiaoguang, WANG Panqi, MA Ronggui. Influence of Fineness Change of Limestone Powder-Fly Ash on Hydration Kinetics of Cement-Based Cementitious Material System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2337-2343.

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