Abstract
Cathodic protection (CP) is under investigation as a repair option for concrete bridges deteriorating as a result of chloride induced corrosion of the reinforcement. An outline of the special requirements for bridges is given, along with experience of the technique in North America. Trials being carried out by the Department of Transport are described, particularly research under way at the Transport and Road Research Laboratory. This has demonstrated that cathodic protection can significantly reduce corrosion in chloride contaminated reinforced concrete and that the levels of CP used did not significantly affect the steel-to-concrete bond strength. The use of potential decay as a technique for routine monitoring of CP installations is discussed. Factors to be considered when costing CP against other options are given. Concrete bridges can suffer considerable deterioration as a result of chloride induced corrosion of the reinforcement. Apart from loss of strength as a direct result of loss in section of the reinforcement, expansive corrosion products can cause the concrete to crack and spall. In the USA and Canada cathodic protection (CP) has become an accepted method of treating structures and is now under investigation for use in the UK. CP is particularly attractive as it should prevent further corrosion of the steelwork even when chloride contamination continues. (Author/TRRL)
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