Analysis of CDT Methods and Factors Affecting Cathodic Disbondment

Abstract A critical analysis of 22 Cathodic Disbondment Test methods used in the US, European Union, France, Germany, Saudi Arabia, China, Canada, Australia, New Zeeland and Other countries is presented in this paper. Parameters and Procedures used in these Standards are qualified and problems of their application discussed. ASTM G8, ASTM G42, ASTM G80 and four of their generic modifications, as well as CSAZ245.20, EN 10289, DIN 30 671 (1987), API RP 5L7 and AWWA C-210 (old) will generate comparable results, when run under same temperature and duration conditions. Also, CD results obtained with French Standard NF A 49-711 and its generic modifications will be comparable with CD values produced by these tests. Australian AS3862 and related AS/NZS 4352 will give approximately 15 – 20 % smaller cathodic disbondments. ASTM G95 and ISO 15711 (E) test will give larger disbondments owing to the tests’ durations.