EVALUATION OF LIGNITE FLY ASH AS A MINERAL FILLER IN ASPHALTIC CONCRETE

The evaluation of lignite fly ash as a filler in asphaltic concrete showed that an addition of 2% Basin Electric fly ash or 2% Ottertail fly ash would significantly improve the stability and durability of a representative North Dakota bituminous mix. A 4% addition of both fly ash samples show some improvement over the 2% addition. There is some variation in performance between the two fly ashes, but both sources fulfill the requirements of a mineral filler. Both sources lowered the air void content of the mix, and did not significantly reduce the optimum asphalt content. In all tests the fly ashes performed better as a mineral filler than the 1% hydrated lime. The optimum asphalt content was determined for four separate fly ash as well as another containing 1% hydrated lime. Tests were also made to determine voids and resistance to water. The test data and conclusions are valid for the particular overall aggregate-filler gradation and aggregate-asphalt system. /FHWA/

  • Corporate Authors:

    Twin City Testing and Engineering Laboratory, Inc

    662 Cromwell Avenue
    St Paul, MN  USA  55114
  • Authors:
    • Henning, N E
  • Publication Date: 1974-2-14

Subject/Index Terms

Filing Info

  • Accession Number: 00260630
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Item (2)-73
  • Contract Numbers: Item (2)-73
  • Files: TRIS, USDOT
  • Created Date: Oct 22 1974 12:00AM