FLY ASH AS A MINERAL FILLER AND ANTI-STRIP AGENT FOR ASPHALT CONCRETE

This project studied the effectiveness of fly ash and other filler-additives as replacements for portland cement and hydrated lime in production of asphalt concrete mixtures. Both mixture design and moisture resistance characteristics were studied. Properties of asphalt concrete containing additions of two different fly ashes at 1, 3, and 6 percent; four combinations of cement, lime, and fly ash; lime kiln dust at 2 percent; and residue from a pilot copper extraction process at two levels, were compared to those of mixtures containing only natural fines; a chemical anti-strip; 2 percent hydrated lime; and 2 percent portland cement. Results of the mixture design phase indicate that with respect to Marshall mixture design criteria, acceptable asphalt concrete mixtures can be produced in the laboratory with up to 6 percent fly ash by weight of aggregate. Differences noted with mixtures containing up to 6 percent fly ash were (1) reduced asphalt requirements and (2) lowered V.M.A. values. Analysis of data generated during immersion-compression testing indicates that fly ash and other fillers investigated in this study can improve moisture resistance characteristics of asphalt concrete mixtures in the laboratory. Several of the filler additives investigated in this study were found to be as effective for improving moisture resistance as chemical anti-strip, portland cement, and hydrated lime. (FHWA)

  • Corporate Authors:

    Engineers Testing Laboratories, Incorporated

    3737 East Broadway Road
    Phoenix, AZ  United States  85040

    Arizona Department of Transportation

    206 South 17th Avenue
    Phoenix, AZ  United States  85007

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Rosner, J C
    • PAVLOVICH, R D
    • Chehovits, J G
  • Publication Date: 1981-1-29

Media Info

  • Pagination: 185 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00334460
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/AZ-81/173 Final Rpt.
  • Contract Numbers: 1-19(173)
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Nov 23 1981 12:00AM