Hydration Kinetics Model of Limestone-Calcined Clay-Cement (LC3) System
WU Lang1, BAO Rong1, DAI Jian1, LEI Bin2,*
1 School of Civil Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China 2 School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China
Abstract: Limestone-calcined clay-cement (LC3) concrete is a new type of composite building material that has a excellent application prospects in meeting the sustainable production of cement and energy conservation and emission reduction. This work proposed a hydration kinetics model for evaluating the chemical and mechanical properties of LC3 concrete by considering the dilution effect, nucleation effect, and volcanic ash reaction of calcined clay and limestone mineral admixtures. Based on the dynamic model, the cumulative hydration heat, calcium hydroxide content, and total bound water of the LC3 cementitious system with different dosages were analyzed and calculated. By comparing the model analysis results with the experimental results, it is proved that the established model can better simulate the hydration process of LC3 cement compound cementing system. The results show that within a certain range of dosage, the hydration degree of LC3 cement cementitious system is directly proportional to the dosage, while the calcium hydroxide content, total bound water, and cumulative hydration heat are inversely proportional to them. The recommended dosage of LC3 used as cementitious auxiliary cementitious material is 25%—35%.
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2024, Vol. 38 
