Corrosion Behavior and Remedial Measures of Angled Steel Reinforcement in Concrete Exposed to Aggressive Environments

The durability of reinforced concrete structures is significantly affected by corrosion of embedded steel, particularly in subsurface components exposed to aggressive environments. This study evaluates the effectiveness of protective measures epoxy-zinc coatings and fiber-reinforced polymer (FRP) in mitigating corrosion of steel angles embedded in concrete. Specimens were subjected to accelerated corrosion in chloride-rich solutions using an impressed current technique. Corrosion activity was monitored through half-cell potential and applied voltage tests, while chemical resistance was assessed using standardized exposure solutions. Durability was further evaluated via Rapid Chloride Penetration Test (RCPT), water absorption, and compressive strength retention. The results demonstrate that coated specimens exhibited significantly lower corrosion activity. The half-cell potential for uncoated steel reached −424 mV (high corrosion risk), while Nitozinc-coated steel remained stable between −158 and −230 mV. FRP specimens showed zero corrosion activity. RCPT values were 4500 Coulombs (high) for uncoated steel, 1600 C (low) for coated steel, and 700 C (very low) for FRP. Compressive strength retention after chemical exposure was 77% for uncoated, 91% for coated, and 98% for FRP specimens. These findings highlight the superior performance of protective coatings and the exceptional durability of FRP in extending the service life of reinforced concrete structures in coastal and industrial environments.