Structural Performance of Corroded Precast Concrete Connections

Abstract Precast concrete offers significant advantages in modern construction, but its long-term performance is critically governed by the durability of its connections. These connections act as preferential sites for reinforcement corrosion, making them the most vulnerable components in precast structures. While extensive research exists on corrosion in monolithic concrete, a significant knowledge gap persists for precast connections. This state-of-the-art review synthesizes literature on the structural performance of corroded precast connections. It evaluates how corrosion impacts key parameters, including load-carrying capacity, moment–rotation, deflection, and stiffness and discusses practical mitigation, inspection, and repair strategies. The review establishes that degradation is consistently more severe in precast connections than in monolithic elements due to localized interface effects. Further, significant deficiencies in design codes [e.g., ACI 318-19 (ACI 2019) and Eurocode 2 (CEN 2011)] are identified, as they lack specific guidance for assessing corroded connections. The findings underscore the nonconservative nature of extrapolating monolithic data and highlight the need for research on tailored testing, modeling, and design guidelines for precast infrastructure.