Research on the dynamic impact performance of polyurethane cement-based composite

The polyurethane cement-based composite (PUCC) has excellent mechanical properties and deformability, which has broad application prospects in civil engineering. However, the research on dynamic impact properties of PUCC is limited. Therefore, in this paper, 11 groups of PUCC specimens were prepared by using different content of basalt aggregate (BA), rubber powder (RP), and polyethylene fiber (PE). Then, the Split Hopkinson Pressure Bar (SHPB) was used to study the dynamic impact tests on PUCC specimens. The stress–strain curves, dynamic stress, dynamic increase factor (DIF), and compressive toughness of PUCC specimens under various strain rates were obtained. The results show that the PUCC has excellent dynamic impact resistance, and its dynamic stress can reach 2 to 3 times of ordinary concrete. The dynamic mechanical properties of the specimens decreased significantly when the BA was added. The dynamic stress, DIF, and compressive toughness decreased by 25%, 13%, and 50%, respectively. Different from BA, the dynamic stress, DIF, and compressive toughness were increased when the PE was added. The incorporation of RP would slightly reduce the dynamic peak stress. However, the DIF and compression toughness were significantly improved. When the content of RP was 40 wt%, the dynamic stress was reduced by 2.5%, while DIF and compressive toughness are increased by 45.7% and 18.7% respectively.