| In order to study the dynamic mechanical properties of concrete under freeze-thaw cycles, a 75mm split Hopkinson compression bar (SHPB) device was used to conduct a series of tests on concrete specimens subjected to 0, 5, 10, 15, and 20 freeze-thaw cycles. The crack propagation, fracture morphology, energy dissipation, and characterization of concrete damage degree were analyzed. The experimental results show that under the same number of freeze-thaw cycles, the peak stress and energy absorbed during fragmentation of the material increase with the increase of strain rate; As the strain rate increases, the failure characteristics of the specimen transition from more severe damage on the rear end face compared to the front end face to more severe damage on the front end face compared to the rear end face; Under the same strain rate, the more freeze-thaw cycles there are, the lower the compressive strength and greater the degree of damage of the material. This study observes the changes in the dynamic mechanical properties of concrete under freeze-thaw environments through experiments, providing experimental and theoretical basis for further research on the freeze-thaw resistance of concrete. |
