Graphene oxide (GO) has been given a great interest for the use as nano-reinforcement in cement composites due to its exceptional mechanical properties and active functional groups. However, the role of GO in cement-based materials has not been elucidated in the literature because of some inconsistent results. This paper aims at providing an intensive review on the reinforcing effects and mechanisms of GO on cement composites by consulting a lot of correlative literature, mainly focusing on the following aspects: (I) the dispersion issue of GO in the alkaline cement paste; (II) the effects of GO on the macro-performance (workability, mechanical strength, and durability) of cement composites; (III) the reinforcing mechanisms of GO including hydration kinetics, C-S-H structure, pore structure, and interfacial bonding with cement matrix. At last, the novel studies on the hybrid of GO with other materials towards further reinforcement and multifunctionality in cement composites are shared. This review may present a clear understanding of the reinforcing role of GO in cement-based materials and arouse new ideas to promote its practical application in construction materials.

氧化石墨烯（GO）因其出色的机械性能和活性官能团而在水泥复合材料中用作纳米增强材料备受关注。然而，由于一些不一致的结果，文献中尚未阐明GO在水泥基材料中的作用。本文旨在通过查阅大量相关文献深入研究GO对水泥复合材料的增强作用和机理，主要集中在以下几个方面：（I）GO在碱性水泥浆中的分散问题；（II）GO对水泥复合材料宏观性能（可加工性，机械强度和耐久性）的影响；（III）GO的增强机理包括水合动力学，CSH结构，孔结构以及与水泥基体的界面键合。最后，共有关于GO与其他材料混合以进一步增强水泥复合材料功能性的新颖研究。这篇综述可能对GO在水泥基材料中的增强作用有清晰的认识，并引起新的想法以促进其在建筑材料中的实际应用。