During the 1976-1977 winter season, the Federal Highway Administration sponsored four studies which were designed to determine if more salt was needed to clear open-graded asphalt friction course during winter storms than was needed to clear conventional asphalt pavements. The four states involved in the study were Maine, Michigan, Utah, and Vermont. Maine, Michigan, and Utah were to observe the snow and ice clearing rates of two open-graded pavement sections and two dense-graded control sections. Vermont was to observe the clearing rates of one open-graded section and single control section. Maine estimated that the amount of salt needed to effectively clear an open-graded pavement was about the same as that needed to clear a conventional asphalt pavement. Michigan agreed but found that slightly less salt per storm would be needed on an open-graded pavement than was needed on a very fine graded asphalt pavement with a light, fine texture. Vermont concluded that less sand and less salt was needed to keep open-graded asphalt pavements in as safe a condition as dense-graded asphalt pavements. Utah observed that more salt was needed to clear open-graded pavements. From the data submitted, it was concluded that more salt was not needed to maintain an equal level-of-service on open-graded pavements during the winter season than was needed on dense-graded asphalt pavements. Skid-resistant characteristics of open-graded pavements appeared to be regularly superior to those of dense-graded pavements. The data also showed that an open-graded pavement cleared faster than a conventional pavement which often remained "icy".

  • Corporate Authors:

    Federal Highway Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Publication Date: 1977-9

Media Info

  • Features: Figures;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00173882
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-TS-77-216 Final Rpt.
  • Files: TRIS, USDOT
  • Created Date: May 31 1978 12:00AM