RE-ALKALISATION AND WITHDRAWAL OF THE CHLORIDES IN CONCRETE BY MEANS OF ELECTRO-OSMOSIS

The important deterioration of a number of concrete structures resulting from carbonation and pollution by chlorides is causing concern in the Roads Department in the Walloon Region. Since 1989, Departmental managers have been considering the treatment of these structures by electro-osmosis. This method is promising but requires additional tests to assess its suitability. Details of the re- alkalisation technique are provided. The method is based on the elctro-osmotic process which occurs when the steel reinforcements in the concrete and the external conductor (a steel lattice) are linked to a direct current source. The technique is illustrated by its application to two structures: a) one where the columns are highly carbonated and where the deterioration of the corroding reinforcement is relatively limited; and b) one containing 66 columns, all of which are highly carbonated and which have a high chloride content. In the first structure re-alkalisation was effected using electro- osmosis, and in the second by the use of a calcium carbonate solution treatment. A method to remove chloride ions from the concrete is also described briefly. For the covering abstract of the conference see IRRD 858602.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0727719262
• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • DEMARS, P
• Conference:
  • BRIDGE MANAGEMENT 2: INSPECTION, MAINTENANCE ASSESSMENT AND REPAIR. PAPERS PRESENTED AT THE SECOND INTERNATIONAL CONFERENCE ON BRIDGE MANAGEMENT HELD 18-21 APRIL 1993, UNIVERSITY OF SURREY, GUILDFORD
• Publication Date: 1993

Language

• English

Media Info

• Features: References;
• Pagination: p. 643-50

Subject/Index Terms

• TRT Terms: Bridges; Chlorides; Conferences; Corrosion; Prevention; Reinforced concrete; Repairing
• ITRD Terms: 3455: Bridge; 8525: Conference; 5252: Corrosion; 7314: Halide; 9149: Prevention; 4794: Reinforced concrete; 3635: Repair
• Subject Areas: Bridges and other structures; Security and Emergencies;

Filing Info

• Accession Number: 00638465
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-7277-1926-2
• Files: ITRD
• Created Date: Nov 24 1993 12:00AM