Abstract: 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.

Key words: road engineering;PVAc latex;modified mortar;corrosion resistance