磨细粉煤灰对提高水泥在西南地区适用性的研究

Research on the Applicability Improvement of Cement with Ground Ash Fly to Southwest Region of China

为了提高水泥基建筑材料在西南地区适用性,采用适量磨细粉煤灰复合水泥净浆进行试验。研究结果表明:掺入磨细粉煤灰后,水泥的抗化学侵蚀性能、干缩、抗碳化、抗冻性能都得到明显改善。利用扫描电镜、X-射线衍射、差热分析、热重分析、压汞孔分析等微观分析方法对掺磨细粉煤灰硬化水泥浆体进行分析,结果表明:随着水化时间的增加,磨细粉煤灰能够逐渐吸收水化产物Ca(OH)2生成更多C-S-H凝胶,提高了水泥石的密实度,改善孔结构,从而水泥基材料的耐久性能提高。

Experiment of cement with ground fly ash show that ground of cement such as coefficient of resistance to chemical corrosion, dry freezing and thawing fly ash can improve the properties shrinkage, carbonation coefficient, resistance. Because of the formed gel, the properties of cement mortar have been improved. The microstructure-analysis by using SEM, XRD, TG, DTA and MIP show that the ground fly ash can absorb the productions of hydrating cement： Ca （OH）2 and C-S-H gel are formed, which can refine the distribution of pore structure, therefore improve the durability.