Abstract：Lightweight, high-strength concrete materials have been widely used in building structures, while their dynamic behaviors under impact action haven’t been fully understood. To investigate the dynamic behavior, a group of high-strength, lightweight concrete cylinders were fabricated. The compressive strength was acquired through uniaxial static loading. Meanwhile, the 150mm-diameter specimens with the length to diameter ratio of 0.5 were tested by using a newly developed large split Hopkinson pressure bar (SHPB) with a diameter of 155 mm. Copper disc was applied as the pulse shaper and the resulting impact velocity was validated to be stable in each test scenario. The damages of the concrete specimens mainly appear to be brittle, and the fragments with different sizes were generated after each impact. The higher the impact velocity, the smaller the sizes of the fragments tend to be. The dynamic strength increases with the strain rate which ranges from 40 to 140 s-1-the energy absorption density increases with the impact velocity, demonstrating the increase of the energy dissipation capacity of the specimen. The dynamic stress-strain curves were regressed based on the experimental results, which can be referred to by the relevant dynamic analysis.
