Abstract
Hydration process of many kinds of cement paste is investigated by Powder X-ray diffraction (XRD)/Rietveld analysis. The parameters of the present study are type of cement (ordinary Portland cement, low heat Portland cement, and Eco-cement), water to cement ratio (0.50, 0.35), and curing temperature (283, 293, 313K). In this contribution, reaction of alite and belite is focused and evaluated. Experimental results show that the reaction of alite is affected by the temperature, but the effect of W/C is rather small. Regarding belite, its reaction is strongly affected by the reaction of alite and temperature. The hypothesis, in which rate of reaction of belite is explained by the ion concentration of CaO and SiO2 in the capillary water and solution equilibrium curve of alite, belite, C-S-H and Ca(OH)2, is proposed. Based on these experimental facts, simple hydration model is proposed.
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