CANMET RESEARCH ON ALKALI-AGGREGATE REACTIVITY IN NEW BRUNSWICK

The existence of alkali-aggregate reactivity (AAR) in New Brunswick has been suspected since the early 1960s. The CANMET research project described in this paper has shown that the natural gravel aggregates in the Province contain significant amounts of potentially deleterious rock types, principally greywacke and slates or meta-argillites. Detailed petrographic examination of hardened concrete from a number of structures was carried out and indicated that AAR is a principal cause of concrete deterioration. Greywackes were found to be the most prevalent rock type associated with the deterioration. Concrete prism testing with CSA Standard A 23.2-14A at 38 degrees C and the NBRI accelerated test at 80 degrees C has confirmed that certain New Brunswick greywackes, argillites and associated limestones range from moderately reactive to extremely reactive under the test conditions. (A)

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    Elsevier Science Publishers

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    Organisation for Economic Co-operation and Development (OECD)

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  • Authors:
    • DEMERCHANT, D P
    • Soles, J A
  • Publication Date: 1993

Language

  • English

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Filing Info

  • Accession Number: 00663467
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 24 1994 12:00AM