Abstract: In order to explore the influences of rubber particles and basalt fibers after interaction and coupling on the mechanical properties of concrete, considering the three main factors of rubber volume content, basalt fiber volume content and basalt fiber length, the influences of these factors on basalt rubber concrete were studied through compressive strength, axial compressive strength, splitting tensile strength and flexural strength tests. The results indicate that the increase of rubber content reduces the mechanical properties of concrete, but improves its deformation ability and reduces its brittleness. The addition of basalt fibers improves the mechanical strength of concrete, but when the content is too high, except for the tensile strength, all other strength decreases. Comprehensive analysis shows that when the rubber volume content is 10%, the basalt fiber volume content is 0.10% and the basalt fiber length is 18 mm, the mechanical properties of concrete are optimal. Based on the analysis of the compressive stress-strain curves, a compressive stress-strain constitutive model for basalt rubber concrete is proposed, which can be used as a reference for nonlinear analysis and engineering design of basalt rubber concrete components.

Key words: basalt fiber, rubber, basic mechanical property, compressive stress-strain curve, constitutive model