Study on the bearing capacity and chloride ion resistance of RC structures under multi-factor corrosive environment and continuous load

Abstract

In this paper, the bearing capacity and chloride resistance of reinforced concrete (RC) structures under multi-factor corrosive environment and continuous load are investigated, and the correlation between the bearing capacity and chloride resistance is also studied. First, different corrosion environments and compressive stress conditions were simulated by freeze-thaw (F-T) cycles test, carbonization test and continuous loading test. Among them, carbonization test and F-T cycles test constitute corrosion cycle test. Then, according to the test results of bearing capacity, under the action of corrosion cycle test, the bearing capacity of RC beam decreases with the increase of corrosion cycles. The bearing capacity of RC beams have a tendency to rise first and then drop with the increase of compressive stress under the multi-factor corrosive environment. In addition, according to the test results of chloride ion erosion, the equation for calculating the corrosion resistance of chloride ion is established, and the resistance to chloride ion erosion increased with the increase of corrosion cycle. With the increase of compressive stress, the ability to resist chloride ion erosion displays the tendency rising up at the beginning and declining in late. Finally, through grey correlation analysis, the correlation between corrosion cycles and yield load is greater than the correlation between chloride ion erosion and yield load, while the correlation with ultimate load is opposite. Based on the results of correlation analysis, the bearing capacity decay equation is established.