In this work, the effects of the non covalent surface modification method on the dispersion of graphene nano-sheets (GNS) in water and chloride diffusion of the cement paste incorporating these dispersions were investigated. Results showed that stable and homogeneous suspensions of graphene nano-sheets were prepared using polyoxyethylene (40) nonylphenylether (CO890) as a dispersant. In this research, water to cement ration is kept 0.30, the addition of GNS is ranging from 0.02% to 0.15% by weight of cement. It is found that introduction small quantities of GNS as little as 0.02% can decrease the chloride penetration depth and coefficient by as much as ∼37% and ∼42%, respectively. This improvement could be attributed to the enhanced degree of cement hydration, filling effect, barrier effect and crack-arresting effect of GNS in cement matrix. This work provides a new way to further understand the improvement of GNS in cement composites.

在这项工作中，研究了非共价表面改性方法对石墨烯纳米片（GNS）在水中的分散体以及掺入这些分散体的水泥浆的氯化物扩散的影响。结果表明，使用聚氧乙烯（40）壬基苯基醚（CO890）作为分散剂制备了稳定且均质的石墨烯纳米片悬浮液。在这项研究中，水与水泥的比例保持在0.30，GNS的添加量为水泥重量的0.02％至0.15％。已经发现，引入少量的GNS到0.02％可以分别降低氯化物的渗透深度和系数约37％和42％。改善归因于水泥基体中GNS的水泥水化程度，填充效果，阻隔效果和防裂效果的增强。