To avoid the harmful effect of inorganic salt antifreeze admixture on concrete in winter construction, high early strength calcium sulphoaluminite cement (CSA) used as the mineral accelerator was added in Portland cement (PC). The effects of CSA content and pre-curing time on the compressive strength, setting time, freezing point and frozen water, hydration heat, hydration products, and pore structures and microstructure were investigated. The results showed that the compressive strength of PC at sub-zero temperature was enhanced about 300% by the addition of CSA at appropriate dosage and pre-curing time (5 wt % CSA with 2 h pre-curing and 20 wt % without pre-curing). The freezing point and the amount of frozen water of paste were decreased by the addition of CSA and pre-curing. In addition, the hydration process, hydration products, and the microstructures were significantly affected by the amount of CSA and pre-curing time.

为了避免冬季施工中无机盐防冻剂掺混料对混凝土的有害影响，在硅酸盐水泥（PC）中添加了用作矿物促进剂的高早期强度硫磺铝钙钙水泥（CSA）。研究了CSA含量和预固化时间对抗压强度，凝固时间，凝固点和冷冻水，水合热，水合产物以及孔结构和微观结构的影响。结果表明，通过在适当的剂量和预固化时间下添加CSA（在预固化2小时后为5 wt％CSA，在未预固化的情况下为20 wt％），零下温度PC的抗压强度提高了约300％。养护）。通过添加CSA和预固化，可降低糊剂的凝固点和冷冻水量。另外，水合过程中，水合产物，