ALKALI AGGREGATE REACTIONS IN CONCRETE

Alkali aggregate reaction (AAR) may cause deterioration in concrete when alkaline solutions attack certain siliceous aggregates. This article describes signs of the trouble, including cracking in concrete and weeping of gel from cracks. AAR depends upon sufficient alkali, a reactive aggregate and adequate mositure. "Low alkali" cements are considered, and rock types found to be reactive. Reference is made to tests for aggregates, and the vulnerability to attack of certain structures due to the presence of water. The article concludes with possible precautions against this type of failure. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0861170471
• Authors:
  • Gutt, W
  • NIXON, P
• Publication Date: 1979-10

Media Info

• Features: Photos;
• Pagination: p. 30-31
• Serial:
  • Construction
  • Issue Number: 31
  • Publisher: Reed Construction Data
  • ISSN: 0045-3900

Subject/Index Terms

• TRT Terms: Aggregates; Alkali; Chemical reactions; Clay soils; Concrete; Concrete aggregates; Cracking; Durability; Failure; Limestone soils; Prevention; Silica stone; Water
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: Alkaline soils; Siliceous clays
• ITRD Terms: 4577: Aggregate; 7353: Alkali; 4755: Concrete; 5211: Cracking; 5520: Failure; 7156: Reaction (chem); 4355: Water
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; Security and Emergencies; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00310178
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0 8611 7047 1
• Files: ITRD, TRIS
• Created Date: Oct 8 1980 12:00AM