Experimental Study on Carbon Fiber Constrained Corrosion Damage of Reinforced Concrete Columns in Saline Soil Environment of Hexi

This study aims to explore the mechanical properties of reinforced concrete cylinders subjected to CFRP‐constrained deterioration damage in the saline soil environment of Hexi. Simulating the saline soil environment in Hexi through continuous semi‐immersion of indoor sulfate–chloride salts, experiments were conducted on two conditions: ordinary RC columns and CFRP‐confined corroded RC columns. Building upon these experimental investigations, strength retention rate and steel corrosion rate were introduced as quantifiable damage metrics. By conducting regression analysis on the stress and strain of reinforced concrete subjected to corrosion damage constrained by CFRP in an erosive environment, an ultimate strength model and an ultimate strain model suitable for CFRP‐constrained damaged reinforced concrete columns subjected to continuous semi‐immersion in sulfate–chloride salt were established. The findings indicate that, as the erosion age progresses, both types of specimens demonstrate an initial increase followed by a decrease in strength and strain, albeit with varying rates of deterioration. The data suggest that the expansive damage caused by stirrup corrosion is a key factor in the degradation of RC. Therefore, when reinforcing concrete columns with CFRP in composite salt erosive environments, it is essential to consider the initial damage to the RC.