橡胶混凝土的冲击压缩试验研究

采用分离式霍普金森压杆装置对橡胶颗粒体积分数为0%～20%的橡胶混凝土进行多应变率动态力学性能试验研究,得到同一类试件在4种应变率下的应力-应变曲线.结果表明,橡胶混凝土是应变率敏感材料,其峰值应力、极限应变表现出显著的应变率强化效应.对于同一橡胶颗粒掺量,橡胶混凝土的增强效应随着应变率的增大而增强.对于同一应变率水平,橡胶混凝土的变形能力随橡胶掺量的增加而增强.从破坏形态来看,橡胶混凝土的抗冲击性能明显优于普通混凝土.

Experimental Investigation on Impact Resistance of Rubberized Concrete

An experimental investigation on the dynamic mechanical properties of the rubberized concrete(RC)with rubber chips of volume fraction from 0%-20% was conducted using split-Hopkinson pressure bar(SHPB).For the same type of specimens,stress-strain curves under 4 different strain rates,were obtained.The test results show that the rubberized concrete has obvious rate-dependent mechanical behavior,its peak stress,ultimate strain of elasticity exhibits significant effect of strain rate strengthening.For the same volume fraction of rubber chips,this effect strengthens with the increase of strain rate.For the same strain rate,the deformation performance of rubberized concrete increases with the increase of volume fraction of rubber chips.From the point of view of the failure mode,impact resistance of rubberized concrete is much better than that of normal concrete.