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The first example of cathodic protection applied to concrete structures was reported in 1957 (Stratfull, 1957) and widespread use of the technique for protecting bridge decks contaminated by deicing salts began in 1973 in North America (Stratfull, 1973(Stratfull, , 1974)). Cathodic protection, as schematically illustrated in Fig. 15.1, is based on changing the electrochemical potential of the steel to more negative values. This potential change can be obtained by connecting an external anode to the steel and impressing direct electrical current (DC) through the rebar using a rectified power supply. This external anode is mounted on the surface of the concrete. The positive terminal of the low voltage DC source is connected to the mesh and the negative terminal is connected to the steel bars. To stop the corrosion of the reinforcing steel bar completely, the potential would have to be lowered to values more negative than w À1200 mV versus Cu/CuSO 4 (CSE) (immunity region in Pourbaix diagram for iron, Figure 1.2 (Pourbaix, 1974)). However, at those values, the cathodic reaction would result in hydrogen evolution, which could cause hydrogen embrittlement of any prestressed steel in th

Author

Amir Poursaee

Publisher

Elsevier

Published

2023

Language

EN

ISBN

9780128218402

Subjects

Engineering, Architecture, Science