Mechanical Properties of Nano-SiO₂ Modified Chopped Basalt Fiber Concrete

In order to systematically explore the synergistic modification effect of chopped basalt fiber and nano-SiO₂ on the mechanical properties of concrete, in this paper, nano-SiO₂ modified chopped basalt fiber concrete was prepared using two materials with different dosings. Through compressive and splitting tensile performance tests, the influence laws of different proportions of basalt fiber dosage and nano-SiO₂ on the mechanical properties of concrete were studied. The test results show that, compared with the fiber-free test group, the addition of 0.15% chopped basalt fiber increases the maximum growth rate of concrete compressive strength to 14.82% and the maximum growth rate of splitting tensile strength to 9.11%. When the content of nano-SiO₂ is 1.6%, the compressive strength and splitting tensile strength of chopped basalt fiber concrete reach their maximum values, and the modification effect is the most significant. Compared with concrete without nano-SiO₂, they increase by 34.49% and 10.66% respectively, and the improvement effect of strength performance is higher than that of concrete with other contents of nano-SiO₂. This study provides an important reference for in-depth exploration of the performance of nano-modified basalt fiber concrete materials and the preparation of high-performance concrete.