Effect of curing temperature and relative humidity on the hydrates and porosity of calcium sulfoaluminate cement

The main objective of this study was to investigate the effect of curing temperature and relatively humidity (RH) on the hydrates and porosity of calcium sulfoaluminate (CSA) cement pastes. A series of experiments including X-ray diffraction (XRD), thermogravimetric (TG) and mercury intrusion porosimetry (MIP) were performed. The results indicate that the formation of hydration products and pore characteristics of CSA cement are dependent on the curing conditions. The formation of ettringite is favor of curing with low temperature and high RH. The rate of formation of aluminum hydroxide (AH3) and monosulfoaluminate (Ms) is well promoted when curing temperature and RH are rising. The total porosity of CSA cement paste is gradually decreased by curing with low temperature and high RH.