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Chemical admixtures are frequently used to regulate the setting and strength development of concrete materials. In this study, tricalcium silicate (C 3 S) was used as a model of the cement system, and the influence of calcium chloride, an extremely useful accelerator, on C 3 S hydration and the pore structure of hardened C 3 S paste were investigated by the combination of the techniques of differential scanning calorimetry (DSC) and the N 2  adsorption (BET). The results indicated that the addition of calcium chloride would significantly shorten the pre-induction and induction periods and enhance the specific surface area and porosity of hardened C 3 S paste. However, the presence of CaCl 2  has little effect on the pores, with a width ranging from 2.5 nm to 5 nm. DSC technique has an advantage of measuring continuously the process of C 3 S hydration by changes of free water in hydrated C 3 S.

Effect of calcium chloride on hydration kinetics and pore structure of hydrated tricalcium silicate