Impact strength and energy dissipation effect of fibre reinforced lightweight aggregate concrete sprayed with anti-explosive coating based on SHPB tests

Abstract：In order to improve the strength and resistance to deformation of lightweight aggregate concrete (LWAC) , the uniaxial compressive strength and SHPB (split Hopkinson pressure bar) tests were carried out on the corresponding different types of concretes by replacing the part of LWCA with normal-weight coarse aggregate (NWCA) , mixing different fibers and by spraying anti-explosive coating on the surface of concrete specimen.The results showed that fiber, NWCA and anti-explosive coating could improve the strength and energy dissipation effect of LWAC, but its influence laws and influence degree were different.The high-elastic modulus fiber and NWCA had significant influences on the pre-peak energy dissipation, while the post-peak and the total energy dissipation were related to strength and deformation of concretes.The total energy dissipation under static loading was linear with the uniaxial compressive strength, while under dynamic loading, the pre-peak energy dissipation was linear with the dynamic peak stress and the total energy dissipation was exponential.The pre-peak, the post-peak and the total energy dissipation under dynamic loading were increased than that under static loading.Under the same impact load condition, only the specimens with anti-explosive coating remained intact, which indicated they could withstand higher impact strength and deformability.

Keyword：fibre reinforce lightweight aggregate concrete;shale ceramsite;anti-explosive coating;SHPB impact;energy dissipation effect;