Experimental Study On Mechanical Properties Of Fully Admixed Steel Fiber Reinforced Rubber Concrete

Rubber concrete incorporates rubber particles of a certain number of meshes in the concrete,thereby improving the plastic properties of the concrete material,while utilizing waste tires and reducing environmental pollution.Because of the elastic properties of the rubber particles,the incorporation of rubber will reduce the strength of the concrete material.However,the addition of steel fibers can increase the toughness of the concrete material,prevent cracking,increase the strength,and improve the bending strength and fatigue resistance of the concrete.The performance is even more remarkable.Therefore,the simultaneous incorporation of steel fibers and rubber into concrete has a better prospect in practical engineering.This article uses ordinary C30 concrete(C)as the benchmark,using 10% volume fraction of 5 mesh rubber particles instead of fine aggregate to prepare rubber concrete(RC).On this basis,steel fiber reinforced concrete(SFRRC)with a volume fraction of 0%,0.5%,1.0%,1.5%,and 2.0% respectively was added to make 36 pieces of 100mm×100mm×100mm.Cube specimens,of which 18 were used for cubical compression tests and 18 were used for splitting tensile tests.72 specimens of 100 mm x 100 mm x 400 mm trabeculae were produced,of which 18 were used for static four-point bending flexion tests and 54 for fatigue tests.Through the compression test,splitting tensile test and four-point bending test of fully-suppressed steel fiber reinforced concrete(SFRRC)and fatigue tests of steel fiber reinforced concrete(SFRRC)under three stress levels,different steel fiber blends were studied.The effect of volume on the mechanical properties of fully-blended steel fiber reinforced concrete(SFRRC),and the fatigue life,fatigue probability distribution and damage evolution of steel fiber reinforced concrete.The main research work is as follows:(1)Through the cubic compressive test,splitting tensile test and dynamic elastic modulus test,compare the effect of steel fiber volume fraction on compressive,splitting tensile and dynamic elastic modulus of steel fiber reinforced rubber concrete.The destruction process and morphology of the test piece.(2)Through the four-point bending test of the trabecular beam,the effect of steel fibers with different volume fractions on the bending and bending resistance of steel fiber reinforced rubber concrete is studied.The peak load is prepared for the fatigue test and the failure process and morphology of the trabecular beam are observed.(3)The fatigue life of steel fiber reinforced concrete was obtained by fatigue tests on the trabecular beams under three stress levels,and the strain-fatigue curve was drawn.(4)The fatigue life of steel fiber reinforced rubber concrete was analyzed with Weibull distribution data,its double logarithmic fatigue equation was deduced,the fatigue ultimate strength was obtained,and the fatigue damage mechanism was analyzed.