CHLORIDE REMOVAL AND REALKALISATION OF CONCRETE BY USING GALVANIC ANODE

Electrochemical repair treatments of reinforced concrete concern realkalisation and chloride removal. They usually need an electri power source to polarise rebar against an anode system that is pl on concrete surface. When structures to be treated are far from a electrical network, such treatments are not cost-effective. So, a electrochemical technique using galvanic anode, for chloride remo and realkalisation, has been developed. In a previous study, the effective anode system, i.e., the metal type and the electrolyte surrounding it, was determined. The electrolytes were either sodi carbonate based, or sodium hydroxide based, or calcium hydroxide based. Then, an experimental program was carried out with small reinforced concrete slabs. These test pieces were previously carbonated and polluted with chloride ions after ponding with 30 (0.3 lb/gal) NaCl solution. Chloride removal and realkalisation treatments were applied to these concrete slabs during 8 weeks. Polarisation resistance of rebar was measured before and after treatment. Also, before and after treatment, concrete cores were taken and used for determining carbonation depths and chloride profiles. It appeared that effective realkalisation and chloride removal could be achieved. This in-laboratory study was complemen with an application of the chloride removal technique on a bridge The results obtained were considered satisfactory. For the cover abstract see ITRD E117314.

• Corporate Authors:

  Federal Highway Administration

  Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
  McLean, VA  United States  22101
• Authors:
  • RAHARINAIVO, A
  • LENGLET, J C
  • TOURNEUR, C
  • MAHOUCHE, H
  • POLLET, V
• Conference:
  • PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON CORROSION AND REHABILITATION OF REINFORCED CONCRETE STRUCTURES HELD 7-11 DECEMB 1998, ORLANDO, FLORIDA, USA
• Publication Date: 1999

Language

• English

Media Info

• Features: References;
• Pagination: 9 p.

Subject/Index Terms

• TRT Terms: Bridges; Conferences; Corrosion; Electrodes; Halides; Material reinforcement; Prevention; Reinforced concrete; Reinforcing materials; Repairing
• ITRD Terms: 3455: Bridge; 8525: Conference; 5252: Corrosion; 6951: Electrode; 7314: Halide; 9149: Prevention; 4794: Reinforced concrete; 3471: Reinforcement (in mater); 3635: Repair
• Subject Areas: Bridges and other structures; Security and Emergencies;

Filing Info

• Accession Number: 00943290
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, , USDOT
• Created Date: Jun 11 2004 12:00AM