Abstract Most cementitious repair materials have non-ignorable drawbacks such as low strength, insufficient bonding, and low anti-permeability. Although the bonding and anti-permeability of repair mortars modified by polymer will be substantially improved, the compressive strength and component integrity will be decreased. Hereby six groups of cement mortars modified by varied dosages of Graphene Oxide (GO) and PA copolymer (GOPARMs) were prepared. The flexural strength (f t), compressive strength (f c), f t/f c, bond strength (f b), and chloride ion migration coefficient (λ c) of GOPARMs were systematically studied by axial compressive, three-bending, pull-out, RCM method, along with microstructure analysis. When GO and PA dosages are fixed at 0.03 and 5 wt%, respectively, the f t, f c, f t/f c, f b, and λ c of GOPARMs reach the best comprehensive performances, which are 6.4, 46.5, 0.14, 6.73 MPa, and 1.179 × 10−12 m2/s. Compared with the control mortar, the f t, f c, f t /f c, and f b of GOPARMs are improved by 5.7, 12.3, 7, and 103%, respectively, and the corresponding λ c is dramatically reduced by 40.4%. Scanning electron microscope (SEM) shows that trace of GO can play a template nucleation effect on the hydration products’ morphology and microstructure of GOPARMs. Meanwhile, cured PA polymer can form hydrophobic film and fill the interfacial pores among hydration products, finally superior repairing performances of GOPARMs with optimal mix can be achieved.

中文翻译：

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氧化石墨烯与聚丙烯酸酯聚合物改性新型水泥砂浆的修复性能

摘要 大多数胶凝修复材料存在强度低、粘结不充分、抗渗性低等不可忽视的缺点。虽然聚合物改性的修补砂浆的粘结性和抗渗性会得到显着提高，但其抗压强度和构件完整性会有所下降。由此制备了六组不同剂量的氧化石墨烯（GO）和PA共聚物（GOPARMs）改性的水泥砂浆。采用轴向抗压、三弯、拉拔、RCM等方法系统研究了GOPARMs的抗弯强度（ft）、抗压强度（fc）、ft/fc、粘结强度（fb）和氯离子迁移系数（λc）方法，以及微观结构分析。当 GO 和 PA 的用量分别固定为 0.03 和 5 wt% 时，GOPARMs 的 ft、fc、ft/fc、fb 和 λc 的综合性能最佳，分别为 6.4、46.5、0.14、6.73 MPa 和1.179 × 10−12 平方米/秒。与对照砂浆相比，GOPARMs的ft、fc、ft/fc和fb分别提高了5.7%、12.3%、7%和103%，相应的λc显着降低了40.4%。扫描电镜（SEM）表明，微量GO对GOPARMs的水合产物形貌和微观结构起到模板成核作用。同时，