Assessment Method of Long-Term-Durability RC Structures Considering Rebar Corrosion Based on Oxygen Consumption
By K. Suhara, C. Li, K. Niwase and Y. Tsuji
Concrete Journal, Vol.61, No.2, Feb. 2023
- Synopsis
- This paper describes a proposed method for the assessment of the durability of RC structures, which are required to have long-term durability, by considering not only oxidative corrosion, which is generally applied to the corrosion of rebar in concrete structures, but also the transition to a reducing atmosphere, where the oxygen concentration becomes very low owing to the consumption of oxygen during oxidative corrosion. It is suggested that a lower corrosion rate may be expected in a low oxygen corrosion environment through the high densification of concrete combined with the use of prestressed concrete that can reduce the assumed in-service crack width and possibly achieve zero crack width, or chemical prestressed concrete with a higher level of crack control.
- Keywords:
- Rebar corrosion, Oxygen diffusion, Low oxygen corrosion, Corrosion rate, Long-term durability
