大流动性钢纤维橡胶混凝土力学及抗冲击性能研究OA

[Objective]This study aims to analyze the effects of steel fibers and rubber particles on the mechanical proper-ties,impact energy dissipation,ductility ratio,and toughness coefficient of high-fluidity concrete.Additionally,it seeks to enhance the mechanical and impact resistance properties of high-fluidity concrete.[Methods]Steel fiber-reinforced rubber concrete(SFRRC)test blocks with different steel fiber contents(0.8%,1.2%,and 1.6%)and rubber particle volume sub-stitution rates(10%,15%,and 20%)were designed.Drop hammer impact tests and basic mechanical property assessments were conducted.A two-parameter Weibull function model was employed to predict the impact resistance lifespan of high-fluid-ity SFRRC.[Results](1)Steel fibers enhanced the cube compressive strength and splitting tensile strength of high-fluidity concrete,whereas the incorporation of rubber particles led to a reduction in strength;(2)Steel fibers significantly improved the impact resistance of high-fluidity concrete.Notably,concrete with a rubber particle volume substitution rate of 20%and a steel fiber content of 1.6%exhibited the highest number of impact cycles before final fracture,demonstrating optimal impact resistance;(3)Under constant steel fiber content,the impact resistance ductility ratio and toughness coefficient of high-fluid-ity rubber concrete increased with a higher rubber particle substitution rate.[Conclusion]Steel fibers and rubber particles exert distinct influences on the mechanical properties of high-fluidity concrete.However,both significantly enhance its impact resistance.The impact resistance lifespan of high-fluidity SFRRC adheres to the Weibull distribution model.This study serves as a valuable reference for evaluating the impact resistance performance of high-fluidity SFRRC.