Research On The Impact Resistanca Of Steel Fiber Reinforced Rubber Self-compacting Concrete

With the development of social economy,waste rubber has caused serious pollution to the ecological environment.Adding some rubber particles into concrete can improve the molding performance of concrete,meanwhile,realize the utilization of waste resources and reduce the pollution to the environment.For the elastic characteristics of rubber itself,the strength of concrete will be decreased significantly after adding the rubber particles.However,Steel fiber mixed into rubber concrete can effectively increase the toughness,strength of the concrete and prevent cracking.Therefore,the simultaneous incorporation of steel fibers and rubber into concrete has a good application prospect in practical engineering.In this text,the experimental is on the basic of ordinary C50 self-compacting concrete,the rubber self-compacting concrete is made with 10%,20%,30% dosage of rubber particles of different particle sizes(below 1mm,1～2mm,2～4mm)instead of fine aggregate,then with 0.5%,1.0%,1.5% dosage of steel fiber mixed into the above rubber self-compacting concrete to prepare steel fiber reinforced rubber self-compacting concrete,which have a total of 78 prism specimens of 150 mm × 150 mm × 300 mm and 234 cylinder specimens of 72 mm × 36 mm.The static and dynamic basic mechanical properties of steel fiber reinforced rubber self-compacting concrete were systematically tested and analyzed through the prismatic compression test and SHPB impact test.The main researches are as follows:(1)Based on the prism compression test,the stress-strain curve of steel fiber reinforced rubber self-compacting concrete was measured,and the effects of rubber content,rubber particle size,and steel fiber content on compressive strength,peak strain,and elastic modulus were analyzed.The failure process and morphology of the test specimens were observed,the static constitutive prediction formula of the steel fiber reinforced rubber self-compacting concrete was established,and through SEM electron microscopy to microscopically observe the steel fiber reinforced rubber self-compacting concrete to reveal the relationship between steel fiber,rubber and cement Bonding mechanism.(2)Based on the SHPB impact test,the stress-strain curve under the impact load was measured,the effects of strain rate,steel fiber content,rubber particle size and rubber content on the failure morphology and impact resistance of steel fiber reinforced rubber self-compacting concrete were analyzed.A dynamic constitutive prediction formula for steel fiber reinforced rubber self-compacting concrete with various variables was established.(3)Using ASTM C1018 standard characteristic point energy ratio method,the toughness index of steel fiber reinforced rubber self-compacting concrete was calculated,and the influence of strain rate,steel fiber content,rubber particle size,and rubber content on the toughness of steel fiber reinforced rubber self-compacting concrete was analyzed.(4)The finite element software ABAQUS was used to simulate the entire SHPB impact process to verify the effectiveness of the steel fiber rubber reinforced self-compacting concrete impact resistance test.