CHARACTERIZATION AND TECHNIQUES FOR RAPID EVALUATION OF IOWA FLY ASHES

An evaluation of seven fly ashes produced from Wyoming coal and available to the construction industry in Iowa is presented. X-ray spectrometry and diffraction were used to determine quantitative elemental and crystalline composition of the seven fly ashes, and long-term, multiple samples were taken at three sources to define variability in elemental composition. It was found that existing ASTM fly ash classification is not necessarily consistent with the coal type, that elemental variability within a single source can be equivalent of that of Type I portland cement, and that quantitative crystalline composition provides information useful for rational categorization. Of the seven fly ashes evaluated, three contained significant amounts of cementitious aluminum bearing phases; and all the fly ashes were comprised of about 25 percent crystalline compounds. Knowledge of cement led to development of a heat evolution test which may be useful in predicting cement content, and an evalaution of crystalline calcium and magnesium oxides suggests that soundness of fly ash-portland cement mortar is not influenced by magnesium oxide but is influenced by the crystalline calcium oxide present in the fly ashes evaluated.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1983/941/941-003.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=CHARACTERIZATION+AND+TECHNIQUES+FOR+RAPID+EVALUATION+OF+IOWA+FLY+ASHES&author=J.+Pitt&author=M.+Mings&author=S.+Schlorholtz&publication_year=1983
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309036607
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Lime and Lime-Fly Ash Stabilization. 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:
  • Pitt, J M
  • Mings, M L
  • Schlorholtz, S M
• Conference:
  • 62nd Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1983-1-17 to 1983-1-21
• Publication Date: 1983

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 12-17
• Monograph Title: Characterization and use of fly ash and copper slag: soil stabilization
• Serial:
  • Transportation Research Record
  • Issue Number: 941
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aluminum; Calcium oxide; Cement content; Coal; Evaluation; Fly ash; Magnesium compounds; Mortar; Portland cement; Quantitative analysis; Rock crystals
• Uncontrolled Terms: Characteristics; Magnesium oxides; Rapid methods
• Subject Areas: Geotechnology; Highways; Materials; I42: Soil Mechanics;

Filing Info

• Accession Number: 00387546
• Record Type: Publication
• ISBN: 0309036607
• Files: TRIS, TRB
• Created Date: Sep 28 1984 12:00AM