Research on mechanical properties and micromechanism of graphene cement-based composites

Abstract

Graphene cement-based composites have become a hot topic in current research because of its superior comprehensive performance. In this work, incorporation of different content of graphene in cement-based materials can significantly improve its compressive and flexural strength. Meanwhile hydration heat with different graphene content and times was studied by TAM Air, while porosity and pore size with different graphene content were studied by MIP. Indeed, micro-mechanism of graphene cement-based was studied by SEM. The results show that when graphene content is 2.00 wt%, its mechanical properties are the best, and compressive and flexural strength were increased by 29% and 35% respectively in 28 d compared with standard sample. Morever, not only the porosity in the sample is reduced, but also the pore size is refined. Meanwhile the strong nucleation effect of graphene promotes the hydration of cement, but does not change the type of hydration products. In addition, SEM images show that the content of graphene reaches the percolation threshold, the conductive network is formed in the sample, and the distance between graphene particles is closer, and the function improvement is more obvious.