基于正交试验的钢纤维橡胶混凝土抗冲击性能研究OA

To enhance the impact resistance of concrete and promote the recycling of rubber resources,a split Hopkinson pressure bar test device was employed.Based on the orthogonal test method,impact resis-tance tests were conducted on concrete with varying rubber content(5%,10%,15%,20%),rubber particle size(80,60,40,20),steel fiber content(0,0.5%,1.0%,1.5%),and steel fiber types(hooked-end,straight,crimped,and milled).The results showed that when the rubber content did not exceed 10%,the dynamic compressive strength of concrete increased with the rubber content.However,when the rubber content ex-ceeded 10%,the dynamic compressive strength exhibited a declining trend due to intensified matrix soften-ing effects.The order of influence of various factors on dynamic compressive strength was as follows:rubber content,steel fiber content,rubber particle size,and steel fiber type.The optimal mix ratio was 10%rub-ber content(40 mesh)and 1.5%hooked-end steel fiber content,under which the dynamic compressive strength peaked at 42.4 MPa,representing a 48.25%increase compared to ordinary concrete.Hooked-end steel fibers performed the best,with dynamic compressive strengths 1.29%,2.18%,and 8.46%higher than those of straight,crimped,and milled fibers,respectively.The synergistic effect of rubber and steel fibers significantly improved the impact resistance of concrete,providing a reference for the protection and materi-al design of engineering structures subjected to impact loads,as well as the recycling of rubber resources.