Research on Thermal and Mechanical Properties of Slag Sulfoaluminate Cement Concrete

The thermal and mechanical properties of slag sulfoaluminate cement (S-SAC) and ordinary Portland cement (OPC) were compared and analyzed by isothermal calorimetry, adiabatic temperature rise and compressive strength tests. The results showed that the total hydration heat of S-SAC cement was 33.5% lower than that of OPC cement at 7 days, and the 28 days compressive strength of S-SAC concrete was 36.4% higher than that of OPC concrete. With different water-binder ratios, the later strength of S-SAC concrete was 50% higher than that of OPC concrete, and the adiabatic temperature rise of S-SAC concrete was 49% of that of OPC concrete at the same ratio. Adding fly ash and granulated blast furnace slag powder could not only maintain the early strength of S-SAC concrete, but also increase the growth rate of later strength; the higher the content of fly ash, the slower the heat release rate of S-SAC concrete, and the lower the adiabatic temperature rise. Compared with OPC concrete, S-SAC concrete showed the advantages of low heat and high strength growth rate in the later stage.