▎ 摘　　要

To investigate the synergistic effect of three-dimensional graphene (3DG) and silica fume (SF) on the properties of hardened cement paste. In this study, 3DG with 0 wt% to 0.2 wt% was added to cement pastes with 0 wt% and 10 wt% SF, respectively. The different properties of hardened cement paste were characterized by MIP, XRD, SEM, nanoindentation and ion-selective electrode. The results show that after incorporating 0.1 wt% 3DG and 10 wt% SF, the microstructure, mechanical property and high-density C-S-H content of hardened cement paste were improved significantly, and the boundary chloride concentration and chloride diffusivity of that decreased by 75% and 54%, respectively. This will be conducive to the promotion and application of cement-based materials in coastal concrete.