Electrochemical re-alkalisation, chloride extraction and alkali-silica reaction in concrete

Phillip Frank Gower Banfill

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
4 Downloads (Pure)

Abstract

Concrete made with potentially reactive aggregate was artificially contaminated with chloride (two levels) or arti-ficially carbonated (two levels) or both in combination. These nine combinations were either left untreated or electrochemically treated by realkalisation and/or chloride extraction and then subjected for one year to the con-ditions of 38°C and high relative humidity that are known to promote alkali-silica reaction. Expansion measure-ments, pore solution analysis and microscopy confirmed that ASR is unlikely to be a problem in realkalised car-bonated concrete because the hydroxyl ion concentration does not reach the level needed to initiate the reaction. However, ASR is potentially significant in concrete treated by chloride removal: observed expansion increased tenfold. In chloride contaminated concrete, increasing carbonation progressively reduces the expansion, although it may still be unacceptably high in partially carbonated concrete.
Original languageEnglish
Title of host publicationConcrete Solutions 2016
EditorsMichael Grantham, Ioanna Papayianni, Kosmas Sideris
PublisherCRC Press
Pages113-119
Number of pages7
ISBN (Electronic)9781315315591
ISBN (Print)9781138030084
Publication statusPublished - 17 Oct 2016
EventConcrete Solutions 2016: 6th International Conference on Concrete Repair - Aristotle University of Thessaloniki, Thessaloniki, Greece
Duration: 20 Jun 201622 Jun 2016

Conference

ConferenceConcrete Solutions 2016
CountryGreece
CityThessaloniki
Period20/06/1622/06/16

Keywords

  • concrete repair
  • re-alkalisation
  • chloride extraction
  • Alkali-silica reaction

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