Reinforcement corrosion significantly impairs the deformation capacity and ductility of reinforced concrete (RC) beams. This study experimentally investigates the flexural behavior of corrosion-damaged RC beams repaired with high-performance non-shrink grout and strengthened with carbon fiber-reinforced polymer (CFRP) composites. Twelve beams across six configurations were tested under monotonic and cyclic loading. Results indicate that while corrosion reduced the displacement ductility index by 51.6%, CFRP strengthening significantly restored flexural strength, increasing the ultimate load capacity by up to 46.3% compared to the control beams. Conversely, repairing with non-shrink grout alone effectively recovered deformation capacity, increasing ultimate deflection and the ductility index by 51.9% and 142.7%, respectively, compared to the damaged state. Under cyclic loading, CFRP U-wrap anchorages were found to be essential in preventing premature debonding, thereby enhancing load retention and structural stability. Furthermore, a theoretical sectional analysis showed good agreement with experimental data, predicting ultimate loads with an error of less than 3%. These findings demonstrate the reliability of the integrated repair-strengthening strategy for practical structural rehabilitation.
Chan-o et al. (Wed,) studied this question.