Cathodic protection of concrete highway bridges.

The paper presents an overview of the cathodic protection of concrete highway bridges with particular reference to the work of the Ontario Ministry of Transportation. The scope includes both bridge decks and substructure components as well as the implications of applying cathodic protection to prestressed concrete members. Results of research studies and operational experience with cathodic protection over a fifteen year period are summarized. The principles of cathodic protection, the materials and components which are used and protection criteria to ensure that corrosion is arrested are described. The need for a monitoring system to ensure effective long-term operation is emphasized and future research activities identified. (A)