Original paper(Vol.48 No.8 pp.907)

Corrosion protection behavior of reinforcing steel after desalination on concrete structure

Ueda Takao; Ashida Masanobu; Miyagawa Toyoaki

Abstract:Desalination is one of the electrochemical methods, aiming to remove chlorides from reinforced concrete structures. However, it is impossible to extract all of chlorides contained in concrete. For this reason, it is important to improve the chloride removal efficiency and to estimate the durability of structures after treatment.
In this study, distribution of Cl^- (total chlorides and water soluble chlorides) was examined after applying desalination. The effect of discontinuous treatment was also investigated. Secondly, change of half cell potential and polarization resistance with time were measured after desalination.
The results showed that the steel protection effect due to applying desalination had been maintained for long time. However, in this study, it was difficult to improve chloride removal efficiency by means of intermittent treatment. So, measuring of half cell potential and polarization resistance is useful to monitor the steel condition after treatment.

Key Words:desalination, electrochemical repair method, chloride removal, intermittent treatment, half cell potential, polarization resistance, durability after desalination