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KINETIC STUDY OF CALCIUM SULFOALUMINATE CEMENT HYDRATION

Calcium sulfoaluminate cement (CSAC) is an alternative binder to Portland cement (PC). Advantages in producing CSAC over PC are in lower CO2 emission and lower energy consumption. In this paper, a variety of industrial wastes, namely phosphogypsum, coal bottom ash and electric arc furnace slag were used as raw materials to provide additional environmental advantages in production of calcium sulfoaluminate cement. Hydraulic minerals in the prepared CSA were determined by X‐ray powder diffraction. Rate of heat generation during hydration had been determined by calorimetric measurements. It was observed that the main heat generation peak can exhibit two exothermic processes. A numerical model for the hydration kinetics is a proposed, based on solving system of two differential kinetic equations, for two interdependent reactions, employing Runge‐Kutta IV method. n conclusion, CSAC production offers an alternative and feasible method of industrial waste minimization.

calcium sulfoaluminate cement; waste minimization; calorimetry; hydration kinetics; numerical modeling.

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