Investigation of dynamic compression properties of basalt fiber reactive powder concrete

Basalt fiber reactive powder concrete (BFRPC) was prepared by incorporating basalt fibers (BFs) instead of steel fiber into reactive powder concrete (RPC). In this study, we experimentally and numerically analyzed the impact resistance of BFRPC at different strain rates (10¹∼10¹ s¹). The Φ75mm Split Hopkinson pressure bar (SHPB) was used for impact compression tests and the finite element software LS-DYNA was used for numerical simulation analysis. The results showed that the high strength BFRPC has an obvious strain rate effect and the dynamic growth factor (DIF) of compressive strength increases logarithmically with strain rate. Meanwhile, the parameters of the CEB model were refitted and the relationship between strain rate and DIF was established. By using the Johnson_Holmquist_Concrete material constitutive model (HJC model), the stress-strain curves and failure patterns obtained were consistent with the experimental results. The incorporation of BFs significantly improve the deformation properties of BFRPC.