CHARACTERIZATION OF FLY ASH BY X-RAY ANALYSIS METHODS

Techniques have been developed for quantitative determination of elemental and crystalline composition of fly ash by X-ray fluorescence and diffraction. In addition to being fast, the methods are accurate and the knowledge provided from quantitative crystalline composition explains many of the behavioral characteristics of fly ash. From the study on one Class C, cementitious fly ash it was found that 23 percent of its composition is crystalline and that significant amounts of aluminous cements (tricalcium aluminate and calcium aluminum sulfate) are present. The cements explain this fly ash's capability for high strengths after hydration. A study involving continuous X-ray diffraction monitoring of hydration products showed that both Ettringite and monosulfoaluminate were formed; but when sufficient quantities of gypsum were introduced, Ettringite formation became dominant. Free calcium oxide was also found in this fly ash, and its behavior with water suggests a hard burned form, which is a feature of particular importance to use of fly ash in Portland cement concrete.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1983/941/941-002.pdf
• Record URL:
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• 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:
  • Mings, M L
  • Schlorholtz, S M
  • Pitt, J M
  • Demirel, T
• 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 5-11
• 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: Calcium oxide; Cement; Ettringite; Fly ash; Gypsum; Hydrates; Portland cement; X ray analysis
• Uncontrolled Terms: Characteristics
• Old TRIS Terms: Monosulfoaluminate
• Subject Areas: Geotechnology; Highways; Materials; I42: Soil Mechanics;

Filing Info

• Accession Number: 00387545
• Record Type: Publication
• ISBN: 0309036607
• Files: TRIS, TRB
• Created Date: Sep 28 1984 12:00AM