不同水泥砂浆的耐酸性研究

Research on the acid resistance property of different cement mortars

通过测试不同品种水泥和不同岩性砂制作的砂浆在酸性侵蚀环境下强度和质量等物理性能的变化,研究胶凝材料和砂的岩性对砂浆耐酸性能的影响。结果表明,在pH=2的硝酸溶液中,普通硅酸盐水泥(含有13%矿物掺合料)具有比高抗硫酸盐水泥稍好的耐酸性能,快硬硫铝酸盐水泥的耐酸性能最差。不同岩性砂对砂浆耐酸性能影响不明显,而砂粒径大小对砂浆耐酸性有较大影响。同时采用X射线-荧光分析(XRF)、扫描电镜(SEM)、X射线衍射仪(XRD)等微观测试手段探讨了酸性腐蚀机理。

Taking the mortars made by different typecement with different lithologic property sands asspecimens, and by testing the changes of their physical properties such as strength and mess etc. under acidcorrosion surroundings, the effects to acid-resistance abilities of mortar caused by different cementing materials and sand lithology are researched. Under the nitric acid solution (pH=2), testing result shows that the acid-resistance of OPC (Ordinary Portland Cement) which contains 13% mineral admixture is a little better than that of SRPC (Sulphate Resistant Portland Cement), while SAC (Rapid hardening Sulpho-aluminate Cement)behaviors the worst. For different sands, their lithologic properties have little effect to the acid-resistance of mortars, but their particle size shows obvious effect. At thesame time, micro observing means ofXRF, SEM and XRD are used to study the acidic erosion mechanism.