Experimental study on reinforced concrete small-eccentricity compressive column after acid rain corrosion

Six groups of reinforced concrete (RC) columns were designed to investigate the impact of acidrain corrosion on the eccentric-compression performance of RC columns. The pH, SO4 2 concentration, and corrosion time were designed as the experimental parameters. The influence of acidrain corrosion on the acidification depth, spalling thickness, compressive strength, bearing capacity, and deformation capacity of the specimens under eccentric load were analyzed. The results demonstrated that the acidification depth and spalling thickness of concrete increased with corrosion time and were related to the pH and SO4 2 concentration of acid rain. The reboundbased compressive strength and the ultimate load of RC columns increased first and then decreased with corrosion time. In addition, the macroscopic behavior and mechanical performance of concrete after acid-rain corrosion were revealed by the observed microphase and micromorphology with XRD and SEM. Finally, a bearing capacity model of RC eccentric compression column after acid-rain corrosion was established.