[1009] HYDRATION MODEL OF CEMENT PASTE MIXED WITH EXPANSIVE ADDITIVE
Keywords:Degree of hydration, Expansive additive, Hydration model, Isothermal Calorimetry., Kinetics
Although expansive additive (EX) has been widely used in concrete as an admixture to allay shrinkage cracking, little research has been done on modeling the hydration reaction of cement paste mixed with an expansive additive. In this research, the hydration process of ordinary Portland cement (OPC) and Portland cement-expansive additive blends were evaluated by using isothermal calorimetry method. Besides, based on the shrinkage-core model, this research represents hydration model that describes the heat evolution of OPC and cement-expansive additive blends. The parameters of this model were determined by fitting to experimental results. Using the proposed model, the degree of hydration and the rate of heat evolution were predicted. A comparison between predicted and measured results was performed and shown a good agreement.