Abstract: The peak strength and energy absorption of steam free reactive powder concrete (RPC) under 6 air pressures (0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 1.0 MPa, 1.1 MPa) are obtained by 80 mm split Hopkinson pressure bar (SHPB) test system. The mass distribution characteristics of fragments corresponding to strain rates ranging from nearly 90 \rms^ - 1-290 \rms^ - 1are analyzed by sieving test. The fractal dimension is used to characterize the fragmentation degree of specimens, and then the variation rule of peak strength and the energy absorption value with the fractal dimension are also explored and compared with other existing cementitious materials. The experimental results indicate that the average particle size of fragments decreases linearly with the increase of strain rate, the coarse particles gradually change into the fine particles while the mass of the medium particles do not change significantly. There exists an exponential relationship between the fractal dimension and the impact speed as well as strain rates. The peak stress and energy absorption value increase with the fractal dimension. The comparison shows that the crushing resistance capacity of steam free RPC is better than that of ordinary concrete and steel fiber reinforced concrete. The quantitative analysis of the relationship between fractal characteristics and mechanical properties, helps to gain more comprehensive evaluation of the investigated material.