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Abstract
This paper reviews the history of the development of impressed current cathodic protection of atmospherically exposed reinforced concrete from the first trials in 1959 on bridges to recently installed systems on a wide range of structures around the world. The paper covers the research efforts, anode developments, control systems and monitoring sensors which are reviewed and their evolution explained. The research into the potential and actual side effects of cathodic protection currents in concrete are summarised. The development of standards and guidance on impressed current cathodic protection is also reviewed.
Highlights
The corrosion of reinforcing steel in concrete has developed into one of the biggest durability issues for reinforced concrete structures
Due to the very low current demand of steel in concrete compared to pipeline or marine applications, the power supplies required for Impressed current cathodic protection (ICCP) of steel in concrete bear little resemblance to the high current output transformer rectifiers required for ICCP of buried and submerged structures such as pipelines
This suggests qualification criteria for applying Cathodic protection (CP) based on steel condition, stress and susceptibility, with suggested test regimes, including on strands extracted from post-tensioned structures to be treated with ICCP
Summary
The corrosion of reinforcing steel in concrete has developed into one of the biggest durability issues for reinforced concrete structures. Impressed current cathodic protection (ICCP) was developed as a method for controlling this problem and extending the life of reinforced concrete. The background to our understanding of the problem of the corrosion of steel in concrete, its investigation and repair options are discussed elsewhere, e.g., see Broomfield [1]. This paper reviews the author’s involvement in and understanding of the history and development of ICCP for atmospherically exposed reinforced-concrete structures, with some of the key papers in that development process
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