Abstract: Graphene (G) coagulates easily and graphene oxide (GO) as its derivative is highly dispersible in water. When mixed in cement slurry, they can display their own advantages and enhance the latter’s dispersibility. Cement mortar mixed together with G and GO and their mechanical properties and corrosion resistance in sodium sulfate solution were investigated in this study. The results show that the simultaneous addition of G and GO to cement mortar improves the strength of cement mortar. When the mass loading of G and GO is 0.075% and 0.03% respectively, the 28d compressive strength and flexural strengthen of cement mortar increases by 49.34% and 40.21% respectively in comparison with the references. The immersion test in sodium sulfate solution shows that the sulfate resistance of the G/GO-blended cement mortar improves significantly. Scanning electron microscopy (SEM) and photoelectron spectroscopy Analytical (EDS) analysis show that the co-addition of GO and G reduce not only the formation of Aft and Afm in the mortar, but also the content of sulfate and aluminum ions in the sample. The porosity test results show that the co-addition of GO and G effectively reduces the porosity of cement mortar and densifies the internal structure of the resulting mortar.

Key words: highway engineering, graphene, grapheme oxide, cement mortar, mechanical properties, corrosion resistance

摘要： 石墨烯(G)极易在水中聚沉，氧化石墨烯(GO)是G的衍生物且在水中具有很好的分散性，二者同时掺入水泥浆中既可发挥各自的优势亦可增强G在水泥浆中的分散性，将G与GO复掺加入的水泥砂浆并研究其力学性能以及在硫酸钠溶液中的抗腐蚀性能。研究结果表明：G与GO复掺加入到水泥砂浆中能提高水泥砂浆的强度，当G与GO的掺量分别为0.075%、0.03%时，水泥砂浆28d抗压强度相对基准试件提高了49.34%，28d抗折强度相对基准试件提高了40.21%；硫酸钠溶液浸泡试验表明复掺G与GO的水泥砂浆试件耐硫酸盐腐蚀性能有明显提高；扫描电镜(SEM)和光电子能谱分析(EDS)分析表明复掺GO和G后不仅可以减少砂浆中的AFt以及AFm的生成，而且可以降低硫酸根和铝离子含量在试件中的含量；孔隙度测试结果表明GO与G的复掺可有效降低水泥砂浆孔隙率，密实砂浆内部结构。

关键词: 道路工程, 石墨烯, 氧化石墨烯, 水泥砂浆, 力学性能, 耐腐蚀