ADDITION OF CLASS C FLY ASH TO CONTROL EXPANSIONS DUE TO ALKALI-SILICA REACTION

Results of a study to determine the influence of five different Class C fly ashes on inhibiting expansion due to alkali-silica reaction (ASR) are presented. Five different sands with varying degrees of ASR, combined with the five different fly ashes, were investigated. An accelerated test method (ASTM P214) was used to detect potentially deleterious expansion of mortar bars due to ASR. Replacement levels of 0, 10, 15, 20, 25, and 30% of cement by weight were investigated for all five fly ashes and for all five sands. Four of the fly ashes were effective in reducing to negligible levels ASR expansions. Varying amounts of fly ashes were needed for effective control of deleterious expansion. Some fly ashes at lower levels of blending (10 and 15%) actually increased expansion. One fly ash was not effective in inhibiting expansion as a result of ASR, even at 30% replacement. Fly ashes with high alkali contents (1.92%) were effective in inhibiting expansion related to ASR. Test results indicated that some Class C fly ashes at adequate replacement levels effectively reduced expansion to negligible levels, even in highly reactive sands.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1994/1458/1458-016.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=ADDITION+OF+CLASS+C+FLY+ASH+TO+CONTROL+EXPANSIONS+DUE+TO+ALKALI-SILICA+REACTION&author=S.+Kakodkar&author=V.+Ramakrishnan&author=L.+Zimmerman&publication_year=1994
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1458, Concrete Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Kakodkar, Sidhesh
  • Ramakrishnan, V
  • Zimmerman, Lon
• Publication Date: 1994

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 109-117
• Monograph Title: Concrete research
• Serial:
  • Transportation Research Record
  • Issue Number: 1458
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Accelerated tests; Alkali silica reactions; Concrete; Durability; Fly ash; Measures of effectiveness; Sand
• Uncontrolled Terms: Effectiveness
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00676699
• Record Type: Publication
• ISBN: 0309060656
• Files: TRIS, TRB, ATRI
• Created Date: Apr 28 1995 12:00AM