| To study the degradation law on the axial compressive properties of steel reinforced concrete short columns under the sulfate attack environment, the compressive property test of concrete blocks and the axial compressive performance test of steel reinforced concrete short column specimens under the sulfate attack environment were carried out in this paper. The failure process and characteristics of short column specimens were observed, and the performance indicators such as the load-displacement curve and bearing capacity of short column specimens were also obtained. The results show that the overall failure mode of short column specimens is basically the same under the axial compressive loads. The profile steel, longitudinal bars, and stirrups yield one after another, which leads to the severe peeling of concrete and the failure to specimens finally. Within the study parameters, the bearing capacity and ductility of short column specimens increase first and then decrease with the increase of erosion age or sodium sulfate solution concentration. At the erosion age of 120 days, the bearing capacity and ductility of short columns increase 14.90% and 21.44% respectively. When the solution concentration reaches 10%, the maximum reduction in bearing capacity and ductility of the short column is achieved, with a decrease of 8.04% and 10.72%, respectively. Therefore, the long-term immersion in the high concentration sodium sulfate solution has a great adverse effect on the axial compression performance of specimens. Based on the experimental study and the existing standard formulas, a modified calculation model on the axial compressive capacity of steel reinforced concrete short columns under the influence of different erosion ages and the sodium sulfate solution concentration is established, the calculated values are in good agreement with the experimental values. |
