Abstract:In order to investigate the dynamic compressive behavior of concrete, tests on concrete, the diameters of rough aggregates used in the concrete ranged form 15mm to 20mm, were performed under compressive impact loading using SHPB( )(Split Hopkinson Pressure Bar)apparatus, and the average strain-rate in these tests ranged from 30s-1 to 180s-1，the photograph related to the deformation or failure process for concrete specimens under dynamic compressure were obtained as well. Results show that once the stresses in specimen get up to a value nearby the peak stress, a macro-crack along the axes of concrete specimen can firstly be observed on its surface, but its failure are finally related to the developing and propagating of primary multi-macro-cracks along the axes of specimen. A modified ZWT concrete constitutive model was proposed, the results predicted from it are in agreement well with those of experiments.