Experimental study on dynamic compressive properties of fly ash high performance concrete
In order to study the compressive performance of high-performance concrete under impact load,the dynamic compressive performance tests of C30,C40,C50 strength grade normal concrete(NC)and high performance concrete(HPC)under five strain rates were carried out by using split Hopkinson compression bar,and the static compressive strength and elastic modulus of various specimens is compared and analyzed.The impact compression tests is simulated by LS-DYNA finite element software.The results show that the static compressive strength and elastic modulus of HPC are significantly better than those of NC.HPC is more dense and has stronger resistance to deformation.With the increase of strain rate,the dynamic compressive strength of concrete increases,and the greater the increase,the more serious the damage is.The dynamic compressive strength and dynamic elastic modulus of NC and HPC have obvious strain rate effect.Under the influence of fly ash and silica fume,the elastic modulus growth factor of HPC changes little with strain rate.The simulation results show that HPC-50 has better resistance to dynamic impact compression than NC-50,and the simulated failure law is consistent with the failure law in the actual experiment.
high performance concretedynamic compression propertiesdynamic increase factorsplit Hopkinson pressure bar
万方数据
维普
