A state-of-the-art review of flexural behaviors of PC beams with corroded prestressing tendons

Abstract

Prestressed concrete (PC) structures are extensively utilized in public infrastructure. Owing to the application of prestressing technology, PC structures are deemed to possess superior durability compared to ordinary reinforced concrete (RC) structures, as they can effectively inhibit concrete cracks and limit crack width. Nevertheless, the infiltration of corrosive substances inflicts harm upon the prestressing tendon embedded inside the PC structure, gradually accumulating over time. The adverse consequences of corroded prestressing tendons on PC structures are multifaceted: degradation of mechanical properties due to corrosion loss, degradation of bond properties due to corrosion expansion, degradation of bearing capacity due to corrosion-induced cracking, etc. These deteriorations in mechanical properties, triggered by corrosion, constitute an irreversible process of durability failure for PC structures. In contrast to ordinary RC structures, the failure of PC structures is characterized by its unpredictability and abruptness, thereby intensifying the risk of damage to PC structures. This paper focuses on the durability of PC structures due to corrosion, and provides a comprehensive literature review and summary of the characteristics and mechanical properties of corroded prestressing tendons, as well as the negative impact on the flexural load-bearing capacity of PC beams. The aim of this paper is to help and contribute to the study of corroded PC structures in order to ensure their proper functionality during use and to provide scientific prediction of residual flexural capacity and durability assessment of existing bridges in order to select the appropriate treatment methods such as repairs and strengthening.