▎ 摘　　要

Due to the high demand for cement-based materials in buildings, graphene has been widely studied as a potential new cement composite reinforcement agent. In this study, polycarboxylate (PC) Superplasticizer, Tetraoxatetradecan-1-ol,14-(nonylphenoxy)-(CO520), Sodium dodecyl-benzenesulfonate (SDBS), Sodium cholate (SC), and Hexadecyl trimethyl ammonium Bromide (CTAB) were used as surface-active agents (SAA). The effects of different graphene contents (0, 0.01%, 0.03%, 0.05%, and 0.07%) on the mechanical properties were experimentally evaluated and analyzed. The results showed that under the same curing condition, when the graphene content is 0.03% (PC as SAA), the mechanical properties arrived at maximum. Compared with the control group, the compressive strength with 3, 14, and 28 curing days, achieved the improvement of 23.49%, 28.75%, and 33.99%, respectively. The flexural strength had the improvement of 22.18%, 25.11%, and 27.18%, respectively. The Scanning electron microscope (SEM), Diffraction of X-rays (XRD), Ultraviolet-visible Spectrophotometer (UV), Energy Dispersive Spectroscopy (EDS) and Raman analysis proved that graphene promoted the hydration reaction, and it played a filling effect and template role in the mortar matrix. Ultimately, when graphene content is within the appropriate range, the filling effect and the unplugging effect of graphene can effectively improve the performance of the mortar.