Smart cement-based composites provide indispensable support for the intellectualization of a concrete structure. Graphene and its composites have been the focus of research in recent years. However, the application of graphene in smart cement-based concrete is still rare, which is probably due to the poor compatibility between graphene and the cement matrix, the high preparation cost of graphene and the complex construction process of the composites. Moreover, existing smart cement-based composites have poor ductility, so their self-sensing range of the ultimate tensile strain is much smaller than that of the compressive strain. In contrast, it is very important to monitor the tensile strain and detect cracks in concrete structures. Additionally, it is necessary to improve the ductility of smart cement-based composites. Therefore, in this study, a graphene/polyvinyl alcohol (PVA) dispersion is prepared by one-step liquid-shear exfoliation at a relatively low cost when compared to commercial graphene products; the dispersion can not only substitute for water but also can be directly used in the cement-based composite material for casting. The mechanical, electrical and piezoelectric properties of the as-prepared graphene/PVA hybrid modified cement with a low graphene content can be comparable with the cement materials using commercial graphene. Thus, graphene/PVA hybrid modified cement could be a potential candidate for structural health monitoring material.

中文翻译：

---

石墨烯/聚乙烯醇对水泥复合材料机械和电性能的影响研究

智能水泥基复合材料为混凝土结构的智能化提供不可或缺的支撑。石墨烯及其复合材料是近年来的研究热点。然而，石墨烯在智能水泥基混凝土中的应用仍然很少，这可能是由于石墨烯与水泥基体的相容性差、石墨烯的制备成本高以及复合材料的施工工艺复杂。此外，现有的智能水泥基复合材料的延展性较差，因此其极限拉伸应变的自感范围远小于压缩应变的自感范围。相比之下，监测拉伸应变和检测混凝土结构中的裂缝非常重要。此外，有必要提高智能水泥基复合材料的延展性。因此，在本研究中，与商业石墨烯产品相比，石墨烯/聚乙烯醇 (PVA) 分散体通过一步液体剪切剥离制备，成本相对较低；该分散体不仅可以代替水，还可以直接用于铸造用水泥基复合材料。所制备的石墨烯/PVA 混合改性水泥的机械​​、电学和压电性能与使用商业石墨烯的水泥材料相当。因此，石墨烯/PVA 混合改性水泥可能是结构健康监测材料的潜在候选者。该分散体不仅可以代替水，还可以直接用于铸造用水泥基复合材料。所制备的石墨烯/PVA 混合改性水泥的机械​​、电学和压电性能与使用商业石墨烯的水泥材料相当。因此，石墨烯/PVA 混合改性水泥可能是结构健康监测材料的潜在候选者。该分散体不仅可以代替水，还可以直接用于铸造用水泥基复合材料。所制备的石墨烯/PVA 混合改性水泥的机械​​、电学和压电性能与使用商业石墨烯的水泥材料相当。因此，石墨烯/PVA 混合改性水泥可能是结构健康监测材料的潜在候选者。