An Experiment Study on the Dynamic Behavior of Concrete Used in a Mine Sealing Wall under a High Temperature

Micro-cracks and material deterioration occur in concrete under high-temperature conditions. To reveal the impact resistance of concrete at a high temperature, a dynamic splitting test and dynamic compression test were carried out using a split Hopkinson pressure bar (SHPB). The failure process and dynamic stress–strain curve of the concrete specimens were obtained, investigating the failure mode and dynamic tensile and compressive strength of the concrete. The test results showed that the surface cracks appeared along the loading direction and extended to the core area under the impact load. With an increase in the temperature, different degrees of damage would be caused, the dynamic strength and toughness of the concrete would decrease, showing brittle failure, and the energy absorbed in the failure process would also decrease correspondingly.