Dynamic splitting tensile test of hybrid-fiberreinforcedrnreactive powder concrete

摘要

In order to investigate the dynamic splitting tensile strength of reactive powder concrete (RPC) under high strainrnrates, split Hopkinson pressure bar experiments are conducted on hybrid-fiber-reinforced (2% steel fiber and 0.2%rnpolypropylene fiber) RPC. The results show that the dynamic splitting tensile strength of RPC increases with anrnincrease in nominal strain rate from 100 to 350 s~(−1). The splitting tensile strength dynamic increasing factor (SDIF) ofrnRPC is lower than that of ordinary concrete with the same compressive strength. This is mainly because therncompactness of RPC is higher than that of normal concrete. Further, considering that it is not safe to apply therncalculation method of SDIF to RPC in the European code Comité Européen du Béton, empirical relations of SDIF andrnstrain rate for RPC with hybrid fibers are proposed. The proposed SDIF–strain rate relations for RPC can be used torncomputer programs for evaluating the dynamic response of RPC structures.