矿渣-水泥复合胶凝材料体系水化反应特性的研究

Study on properties of hydration reaction of slag-cement composite cementing material system

研究矿渣掺量对矿渣-水泥复合胶凝材料体系水化反应动力学过程的影响。结果表明:复合胶凝材料体系的水化放热速率随矿渣掺量增加和水化温度的降低而下降;非蒸发水含量随矿渣掺量的增加呈现先增大后降低的趋势,当矿渣掺量为30%时,非蒸发水含量达到最大值;复合胶凝材料体系的抗压强度随矿渣掺量的增加而降低,且复合胶凝材料体系抗压强度在28 d前增幅较大,在28 d后增长趋于平缓。从SEM照片上可以看出,矿渣掺量不超过30%的复合胶凝材料体系中,部分凝胶与晶体紧密结合在一起,试样微观界面结构较为致密。

The influence of slag dosage on the hydration kinetics of slag-cement composite cementing material system is studied. The results show that the exothermic rate of hydration decreases as the slag dosage increases or the temperature of hydration decreases. The non-evaporable water content increases at first and then decreases with the increasing of slag dosage,and reaches the maximum as slag dosage is 30%. The compressive strength decreases as slag dosage increases,the increasing rate of which is evidently before 28 days,after that it is flat or become slow. It can be seen from SEM that,in the system of slag dosage below 30%,the gel-like structures bind with crystals which make the system very compact.