REDUCTION IN MORTAR AND CONCRETE EXPANSION WITH REACTIVE AGGREGATES DUE TO ALKALI LEACHING

It is noted that mortar bar expansion tests for evaluating alkali-silica reactive aggregates are not always reliable, and that containers with efficient wick systems may cause excessive leaching of alkalies out of mortar bars, thus reducing expansion. The problem has become highlighted since introduction in 1987 of a new recommended container for the ASTM C 227 mortar bar test. The use of the container can result in deleteriously expansive aggregates appearing innocuous in laboratory testing. It is necessary, therefore, to calibrate the severity of the storage condition by conducting calibration tests with known alkali-reactive aggregates as reference materials. The unsuitability is noted of Pyrex glass for calibrating storage conditions because it contributes alkalies to the reaction.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Rogers, C A
  • Hooton, R D
• Publication Date: 1991

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 42-49
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 13
  • Issue Number: 1
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Alkali; Alkali silica reactions; Concrete; Expansion; Leaching; Mortar; Reactive aggregates
• Old TRIS Terms: Alkalies
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00610801
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 1991 12:00AM