The problem of durability for large concrete structures became a matter of real concern some 10 years ago in Sweden. An essential cause of the problem was for many objects defined to be the chloride content and/or water content of the structure. Also alkali silica reactions (ASR had to be considered). Removing of salt from concrete by means of an electric force has been introduced as a way to reduce damage due to high chloride content. Investigations, laboratory as well as field tests show a certain reduction of chloride content but they show too the necessity of further research before the method is ready for use in a more wide practice. Several structures in Stockholm have in a test program been used in used in this project by the Stockholm Consulting - Materials Testing Laboratory. The paper describes a number of cases, the methods used, experiences and conclustions. (A)
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