ABSTRACT Reinforced concrete (RC) structures in marine environments are vulnerable to reinforcement corrosion, which degrades the bond between reinforcement and concrete and threatens structural durability. This study investigated the bond performance of steel bars, basalt fiber reinforced polymer (BFRP) bars, and steel‐fiber composite bars (SFCBs) embedded in concrete under seawater immersion, wet‐dry cycling, and wet‐dry cycling with pre‐cracking for corrosion ages of 30, 60, and 90 days. The results show that the bond‐slip behavior of BFRP bars and SFCBs exhibits four stages, whereas steel bars do not display a residual stage. The bond strength of the steel bar and concrete increased from 12.87 to 19.36 MPa during the first 60 days due to rust expansion but subsequently decreased by approximately 25%. After 90 days, the bond strength decreased from 16.74 to 12.44 MPa for BFRP bars and from 12.77 to 11.58 MPa for SFCBs, corresponding to reductions of 25.69% and 9.32%, respectively, demonstrating superior long‐term corrosion resistance compared with steel reinforcement. The MBPE model accurately fitted the experimental bond‐slip curves, with R 2 > 0.90 for all groups except B‐I‐30. These results support the application of FRP reinforced concrete structures in marine environments.
Cheng et al. (Mon,) studied this question.