采用聚醋酸乙烯酯(PVAc)乳液制备改性水泥砂浆,研究了PVAc改性砂浆经硫酸、硝酸、氢氧化钠、硫酸钠和汽油腐蚀后的强度残留比,并通过扫描电镜(SEM)观测了砂浆的微观形貌,采用X射线衍射仪(XRD)分析了经腐蚀后砂浆的物质组成.结果表明:水泥砂浆耐硫酸、硝酸腐蚀性能较差,但PVAc乳液可有效改善砂浆的耐酸腐蚀性能;PVAc乳液可一定程度改善水泥砂浆的耐硫酸盐酸腐蚀性能;高含量PVAc改性砂浆可应用于碱性环境;油污对普通水泥砂浆和聚合物水泥砂浆腐蚀效果均不明显;PVAc乳液胶膜可填充水泥砂浆的内部孔隙,有效阻塞了腐蚀介质进入,同时,PVAc胶膜具有弹性,可吸收膨胀应力,降低了膨胀破坏发生,从而改善砂浆的耐腐蚀性能.
The modified cement mortar was prepared by polyvinyl acetate latex.After immersed in sulfuric acid, nitric acid, sodium hydroxide, sulfate solution and painted through gasoline,the residual strength ratio of mortar was measured to analyze the corrosion resistance.The scanning electron microscope (SEM) was conducted to observe the micro-morphology of modified cement mortar.The main chemical composition of corroded cement mortar was analyzed through X-ray Diffractometer (XRD) test.The results show that the mortar is easy to be corroded by acid solution, while the PVAc latex can improve the acid-resistance to some extent.The sulfate-resistance can be increased with the addition of the PVAc latex.The mortar with high content of PVAc can be used in alkaline environment.The gasoline has little effect on the corrosion resistance.The curing films of latex can fill the porous structures in modified mortar, which prevent the corrosive medium from entering the mortar.Meanwhile, the elastic films can absorb the swelling stress, and reduce the expanded destruction phenomenon, which can improve the corrosion resistance of cement mortar.
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