养护温度对硅酸盐水泥-硫铝酸盐水泥体系性能的影响

Effect of Curing Temperature on the Performances of Portland Cement-Sulphoaluminate Cement Compound Cementitious System

实际修补工程的环境温度变化大,而不同温度会对胶凝体系水化反应和水化产物的稳定性产生影响,本文通过测试以不同比例复合的硅酸盐水泥-硫铝酸盐水泥体系性能,选择合适配比,再通过测试复合体系在不同养温度下的流动度、凝结时间、膨胀性和强度,研究不同养护温度对复合体系各项性能的影响规律,并采用XRD分析其变化机理。试验结果表明:随着硫铝酸盐水泥掺量增大,水化反应加快,凝结时间缩短,强度发展快,但在温度高于35℃时,复合体系水化产物后期发生分解,使强度和膨胀性能下降。

The actual repair projects have large changes in ambient temperature,the temperature would influence the hydration of cementitious system.In this paper,the performances of different ratio composite system were tested and then choose the proper proportion.The performance of composite system in different curing temperature were studied by testing the fluidity,setting time,expansion rate and strength.The results show that with the increase of sulphoaluminate cement,the hydration reaction faster,setting time shorter,strength development faster,but at temperature higher than 35 ℃,the hydration products of the composite system can decompose which affecting the strength and the expansion rate.