Dynamic Behavior Of Reactive Powder Concrete In Split Hopkinson Pressure Bar Testing

This thesis is focused at the research of the dynamic behavior of reactive power concrete (RPC) using the split-Hopkinson pressure bar (SHPB) test. The stress-strain curves and dynamic increase factors (DIF) of the RPC with different types and contents of fiber and plain RPC in the condition of lateral restriction were abtained from the tests, and the effect of fiber types, content and the degree of lateral restriction on the dynamic behavior of RPC were analyzed and discussed in the thesis.The development history and the research status of the material of RPC and the SHPB test are introduced. Based on literature review of previous research studies, a series of RPCspecimens were designed with different contents and curing conditions.The thesis used the SHPB (40mm, 37mm, 74mm in diameter) test to study the dynamic behaviors of plain RPC, RPC with 2% common steel fibers, 1-5% copperized steel fibers, 1% polypropylene fibers and RPC with lateral restriction with carbon fiber reinforced plastic. The specimens of plain RPC, RPC with 2% common steel fibers, 2% copperized steel fibers, 1% polypropylene fibers and RPC with lateral restriction with 1, 2, 3 layers of carbon fiber reinforced plastic were tested in the SHPB test of 40mm in diameter. All types of RPC content were tested in SHPB test of 37 mm in diameter. Only the specimens of plain RPC, RPC with 2% copperized steel fibers and 1% polypropylene fibers were tested in the SHPB test of 74mm in diameter. Through comparing the stress-strain curves, DIF and the failure mode of different RPC content, the thesis depicted the effect of steel fibers, polypropylene fibers and carbon fiber reinforced plastic on the RPC reinforcement, and expatiated on the function mechanism. It is founded that every contents of RPC had the strain rate effect, and the effect on plain concrete was more obvious than other RPC with fibers. With the increase of dynamic compressive strength of RPC, the effect of strain rate declined. Polypropylene fibers could improve the impact compressive strength and ductility of RPC. Steel fibers could improve the impact compressive strength, along with much more improvement in ductility and deformation capacity. The plain RPC with lateral restriction has higher dynamic compressive strength and elastic module. In the thesis, the relationship of dynamic...