温度对硫铝酸盐水泥抗压强度、电阻率与化学收缩的影响

Effect of Temperature on Compressive Strength,Electrical Resistivity and Chemical Shrinkage of Calcium Sulphoaluminate Cement

研究了20,30,40,50℃等养护温度对早龄期硫铝酸盐水泥浆体抗压强度、电阻率和化学收缩的影响规律,并对其24,72h龄期时的水化产物变化情况进行分析.结果表明:养护温度升高会明显缩短硫铝酸盐水泥水化反应到达稳定期的时间,略微提高3d抗压强度,减小24h龄期时的电阻率和化学收缩;不同养护温度下硫铝酸盐水泥浆体的电阻率与化学收缩存在正相关关系;随着养护温度的升高,24,72h龄期时无水硫铝酸钙的含量不断减少,钙矾石的生成量逐渐增多,但在50℃时又有所减少.

The effects of different curing temperatures（20,30,40,50℃）on properties of the early calcium sulphoaluminate cement,such as the compressive strength,electrical resistivity and chemical shrinkage were investigated.The hydration products were analyzed at 24 hand 72 hof curing.The results show that higher temperature significantly shortens the time when the hydration reaction of calcium sulphoaluminate cement pastes reach the stabilization stage,and slightly increases the compressive strength at 3 d,and decreases the electrical resistivity and chemical shrinkage at 24 h.There is a positive correlation between the electrical resistivity and chemical shrinkage.With the increase of curing temperature,the content of calcium sulphoaluminate decreases at 24 hand 72 h,and the content of ettringite increases first and then decreases at 50℃.