ABSTRACT The strength of sulfoaluminate cement (SAC) is easy to deteriorate under low temperature conditions, and the unique physical and chemical properties of nano‐CaCO 3 have the potential to improve the cementing of SAC. The effects of nano‐CaCO 3 on the fluidity, final setting time, early compressive, flexural, splitting tensile strength, and early compressive toughness of SAC at 25°C, 0°C, and −10°C were studied. The results show that the addition of nano‐CaCO 3 can reduce the expansion and final setting time of SAC and improve the early mechanical properties of SAC. The spread‐flow value and final setting time decreased by 5.2% and 46.7%, respectively. The early compressive, flexural, splitting tensile strength, and early compressive toughness increased by 7.5%,5.7%, 11.7%, and 39.1%, respectively. The mechanism analysis shows that the filling effect of nano‐CaCO 3 can improve the overall structure of SAC, and its nucleation effect can promote the hydration of SAC, thus improving the early performance of SAC.
Bian et al. (Sun,) studied this question.
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