In order to improve the mechanical properties of concrete,the influence of chopped basalt fiber on the mechanical properties of concrete was studied.Short cut basalt fibers with different volume contents(0.25%,0.5%,0.75%,1.0%,1.25%)and different lengths(6 mm,12 mm)were mixed into concrete with different matrix strength grades based on C40 concrete.Cube compressive strength,splitting tensile strength and flexural strength tests were carried out to analyze the impact of short cut basalt fibers on the mechanical properties of concrete.The quantitative relationship between the flexural strength of C40 concrete and the volume content of chopped basalt fiber is fitted.The results show that at the same content,12 mm chopped basalt fiber has better effect on improving the mechanical properties of concrete than 6 mm chopped basalt fiber.When the content of 12 mm chopped basalt fiber in C40 concrete is 1%,the cube compressive strength,splitting tensile strength,tension compression ratio and flexural strength of C40 concrete are increased by 7.11%,30.00%,21.34%and 24.89%respectively compared with those concrete without basalt fiber.At this time,the improvement effect of concrete mechanical properties is the best.
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