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The long-term effectiveness of electrochemical chloride extraction as remediation for corroding steel in reinforced concrete

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conference contribution
posted on 10.05.2012, 11:06 authored by G Sergi, Chris GoodierChris Goodier, A.M.G. Seneviratne
Steel reinforced concrete blocks were subjected to electrochemical chloride extraction after they were dosed with chlorides. Following treatment, the blocks were exposed to the elements at the BRE exposure site for a period of up to 6 years. A selection of blocks were cut into smaller steel-containing prisms after 4 ½ years of exposure and were exposed to controlled laboratory conditions for 6 months while determining the level of corrosion by linear polarisation. At termination, each steel bar was removed and examined visually. The level of corrosion of each bar was also assessed gravimetrically. The final chloride concentration profile of each prism to a depth beyond the steel bars was also determined. Results suggested that corrosion was reduced significantly following chloride extraction but that the primary controlling factor, both for the desalinated and control specimens, was the level of chloride present at the depth of the steel reinforcement. Coating the concrete after treatment resulted in an overall increase in corrosion level, possibly because the coatings were not coherent and allowed moisture to penetrate the concrete through cracks and defects which could not subsequently escape owing to the coating.

History

School

  • Architecture, Building and Civil Engineering

Citation

SERGI, G., GOODIER, C. and SENEVIRATNE, A.M.G., 2003. The long-term effectiveness of electrochemical chloride extraction as remediation for corroding steel in reinforced concrete. IN: "Past Successes - Future Challenges". Proceedings of EUROCORR 2003, Budapest, Hungary, 28 September - 2 October 2003.

Publisher

The European Corrosion Congress

Version

AM (Accepted Manuscript)

Publication date

2003

Notes

This conference paper was presented at EUROCORR 2003, Budapest, Hungary, 28 September - 2 October 2003.

Language

en