The coupling effect of flexural loading and wetting–drying cycles on chloride transmission in silane composite emulsion-protected concrete is presented in this paper. Graphene oxide/isobutyltriethoxysilane (GS) and tetraethyl orthosilicate/isobutyltriethoxysilane (TS) composite emulsion was prepared to obstruct the penetration of chloride, and the influence of flexural loading and exposure time on the protective effect were mainly considered. The results show that the content and diffusion coefficient of chloride are affected significantly by flexural loading, exposure age, and protective emulsion. Loads with different stress ratios affect the internal transmission of chloride by changing the compactness of concrete. The prolongation of the exposure age leads to the accumulation of chloride, thereby increasing the internal chloride contents of concrete. The GS/TS composite emulsion reacts with the hydration products to form the hydrophobic layer, which can significantly prevent the penetration of chloride. In particular, the protective performance of GS under low stress ratios is better than that of TS, while under high stress levels, TS has better resistance to chloride erosion. Relatively speaking, the long-term protective effect of GS is better than that of TS.

本文介绍了弯曲荷载和干湿循环对硅烷复合乳液保护混凝土中氯离子传输的耦合影响。制备了氧化石墨烯/异丁基三乙氧基硅烷(GS)和原硅酸四乙酯/异丁基三乙氧基硅烷(TS)复合乳液来阻碍氯离子的渗透，并主要考虑弯曲载荷和暴露时间对防护效果的影响。结果表明，弯曲载荷、暴露年限和保护乳液对氯化物含量和扩散系数有显着影响。不同应力比的荷载通过改变混凝土的密实度来影响氯离子的内部传输。暴露龄期的延长导致氯化物的积累，从而增加混凝土内部氯化物含量。 GS/TS复合乳液与水化产物反应形成疏水层，可显着阻止氯离子的渗透。特别是低应力比下GS的防护性能优于TS，而高应力比下TS具有更好的抗氯离子侵蚀能力。相对而言，GS的长期保护作用优于TS。