BRE Digest 330: Alkali-silica reaction in concrete - the case for revision Part 1

It is suggested that a new version of BRE Digest 330 is required following 20 years of using the current document and with the significant changes that have occurred in concrete technology and regulation. This article lists the issues to be reviewed and three of the topics are discussed (the remaining four are included in Part 2). The issues considered here are i) the classification of cement alkalinity and need for/level of step changes between alkali classes, ii) the alkali classification of composite cements and cement combinations and iii) the alkali contribution from aggregates. Each issue is examined and recommendations put forward for changes to the guide. The recommendations include the continuation of the classifications 'low', 'medium' and 'high' with redefinition of these titles. It is recommended that it should be stated that no reactive alkali should be considered to be contributed from sintered fly ash or expanded clay aggregates or by any other means than by contamination. The final recommendation of this section suggests research to evaluate the RILEM method as a useful indicator of reactive alkali contribution from aggregates.

Language

  • English

Media Info

  • Pagination: 42-44
  • Serial:
    • CONCRETE
    • Volume: 43
    • Issue Number: 6
    • Publisher: THE CONCRETE SOCIETY
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 01147011
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 24 2009 8:37AM