氧化石墨烯对水泥水化机理的影响及其在超高性能混凝土中的应用

In order to make a truth that whether there is a mechanism that graphene oxide regulate the cement hydration morphology in the graphene oxide-cement system,this project researches the morphology of hydration products in the different space condition of the graphene oxide-cement system by using SEM to observe the surface and farcture surface of hardened cement paste, respectively.On the basis of these researches, this project studies the effect of graphene oxide on cement hydration and the enhancement mechanism by using both direct and indirect methods, such as X-ray diffraction (XRD), the hydration heat release rate determination, the load- strain measurement of concrete beams and the chloride ion diffusion coefficient of concrete determination; Finally, graphene oxide will be used to prepare ultra high performance concrete (≥C150). The systematic study of this project is to lay a theoretical foundation and technical basis for the potential application of graphene oxide in cement-base material.

本项目采用水泥石试样表面和断面进行SEM观察，分别研究氧化石墨烯-水泥系统的水泥水化产物在不同空间状态下的形貌以明确氧化石墨烯-水泥系统的水泥水化是否存在调控水化物形貌的机理；在此基础上，采用X射线衍射、水化放热速率测定、混凝土梁荷载-应变测定、混凝土氯离子扩散系数测定等直接和间接的方法研究氧化石墨烯对水泥水化的影响和增强机理；最后，利用氧化石墨烯制备C150以上的超高性能混凝土，为氧化石墨烯在水泥基材料的潜在应用打下理论基础和技术基础。

本项目利用自制的氧化石墨烯（GO）来改善水泥基复合材料的抗折和抗压性能，并提出GO对水泥基复合材料的作用机理主要是通过GO发挥“盾牌”效应阻止微裂纹的扩展从而达到增强、增韧的效果。项目资助发表SCI论文2篇，还有一篇SCI正处于审核阶段，已授权国际专利2项，待授权国家专利1项；项目培养博士研究生2名，硕士研究生 7名均已经毕业并取得硕士学位。项目直接经费60万元，支出28.9153万，剩余经费31.0847万，剩余经费用于项目后续支出。