▎ 摘　　要

The homogeneous dispersion of graphene oxide (GO) in cementitious materials is critical to achieve the unique properties of this mixture. In this study, based on the formation kinetic of GO aggregation and the production procedure of cement, an isolated-dispersion strategy of isolating GO by cement particles has been successfully developed. The cross-linking behavior between adjacent GO sheets is inhibited during the hydration process, which is achieved by the ball milling process of grinding clinker, gypsum, and GO particles in a planetary ball mill. The dispersion of GO in hardened cement paste is observed through X-ray computed tomography. The results show that GO can be uniformly dispersed both in dry cement particles and hardened cement paste through the ball milling approach. In contrast, serious aggregations with large sizes and irregular morphology are observed in the samples that directly incorporate GO sheets. The uniform dispersion of GO results in a higher and more indiscrete mechanical strength. These results demonstrate that the isolated-dispersion strategy is an effective way to realize the good dispersion of GO in a cement matrix.