Experimental Study on Impact Properties of Reactive Powder Concrete Using SHPB after Exposure in High Temperature

Uniaxial-compression split Hopkinson pressure bar(SHPB) experiments with lead flakes as pulse shapers were performed for reactive powder concrete(RPC) samples.Both the untreated concrete specimens and the specimens after exposure in high temperature(400,600,800℃) were tested in order to investigate the influences of strain rate and temperature on dynamic mechanical behavior,deformation properties and failure of RPC concrete.The results show that the dynamic compressive strength,fracture degree and energy absorption of RPC exhibit remarkable strain rate sensitivity both at room temperature and after exposure in high temperature.However,strain rate has little effect on peak strain,initial Young modulus or energy absorbency.And there are few influences of temperature on strain rate effect.It is also found that dynamic compressive strength,initial Young modulus and energy absorbency at different strain rate all decrease after exposure in high temperature while peak strain increases.