| Summary: | In this research, silane coupling agent was used to modify the surface of nano-SiO<sub>2</sub>, particles and the effects of modified nano-SiO<sub>2</sub> particles on the mechanical properties of high-performance cement-based composites and its mechanism were systematically studied. The results indicated that the optimum modification parameters were a coupling agent content of 10%, reaction temperature of 65 °C, and reaction time of 8 h. Compared with the unmodified nano-SiO<sub>2</sub>, the modified nano-SiO<sub>2</sub> promoted and accelerated the hydration process of cement. The pozzolanic effect, filling effect, and nucleation effect of modified nano-SiO<sub>2</sub> made the microstructure of the composite more compact, and thus improved static mechanical properties of cement-based composites.
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