Vast reserves of subbituminous and lignite coal will be used in power production in the United States in the years to come. A byproduct, fly ash, collected from the flue gases of coal burning powerplants will be produced in large quantities. Since bituminous coal fly ash has been used in concrete to considerable advantage for several years now, it is quite likely that similar use could be made of lignite and subbituminous coal fly ashes. If so, this material could provide a plentiful supply of a potentially low cost cementing medium for use with portland cement in concrete. Fly ashes were obtained from five Western United States powerplants. A complete chemical and physical analysis of each lignite and subbituminous ash was made and none were found to meet all requirements for a Class F pozzolan according to Federal Specification SS-P-570B. Concrete mixes were made with 15 and 25 percent replacement of cement, by weight, with these fly ashes, and compared to a mix containing no fly ash and to mixes containing 15 and 25 percent replacement of fly ash meeting the requirements for a Class F pozzolan. The resulting hardened concrete was found to have adequate compressive strength, reduced drying shrinkage, and satisfactory freeze-thaw durability, but, in some cases, drastically reduced resistance to sulfate attack.

  • Corporate Authors:

    Bureau of Reclamation

    Denver Federal Center
    Denver, CO  United States  80225
  • Authors:
    • Dunstan Jr, E R
  • Publication Date: 1976-1

Media Info

  • Pagination: 30 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00137148
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: REC-ERC-76-1 Prog. Rpt.
  • Files: TRIS
  • Created Date: Sep 4 1976 12:00AM