Abstract
Cement components usually contain two or more hydration active substances with different hydration reaction rates, and the existing hydration exothermic model of cement-based materials do not consider the difference of reaction rates of active substances. This paper proposes a new exothermic hydration model of cement-based materials, which takes into consideration the different reaction rates of multi-component active substances. Firstly, the hydration heat and the representative temperatures of cement slurry with the water-cement ratio of 0.3, are tested through adiabatic and dissolution heat methods. Secondly, the total hydration reaction process is assumed as the composition of the reaction processes of multi-component active substances. Then, a hydration exothermic model witch is superimposed by several exponential functions is fit according to the exothermic hydration experimental data and the Arrhenius chemical expression. The comparison results show that the proposed model is more accurate than the monomial exponential function model, especiallyat the early age before the initial setting time. In conclusion, the proposed model can better explain the influence of the reaction rate difference of different active substances of cement on the exothermic process, and the accuracy of hydration analysis is more accurate by using it than others.
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