The design, construction, and initial evaluation of the sulphur extended asphalt (SEA) pavement on the Baker River Highway near Concrete, Washington, is summarized in this paper. The initial design testing indicated that the resilient modulus of the SEA mixtures varies not only with SEA ratio but also with time after mixing and compaction. This resulted in using a 20/80 sulphur/asphalt binder ratio. A unique construction feature of this project was the manner in which sulphur was added to the hot-mix. Dry, bulk sulphur was introduced directly into the asphalt weigh bucket (batch plant) for melting. Other construction observations include no significant quantities of H2S or SO2 being detected at the plant or paver sites, but special attention is required to prevent elemental sulphur (or associated compounds) condensing on copper connectors of alternators, plugging copper radiators, etc. No noticeable differences were observed in placing and compacting SEA mix versus conventional hot mix. During the subsequent pavement evaluation period following construction, a white to yellow colored residue has appeared on the pavement surface in areas of moisture migration through the pavement. This residue is primarily a family of metallic sulphate compounds. (Author)

  • Corporate Authors:

    University of Washington, Seattle

    Department of Civil and Environmental Engineering, P.O. Box 352700
    Seattle, WA  United States  98195-2700

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Liddle, W A
    • Mahoney, J P
  • Publication Date: 0

Media Info

  • Features: Figures; References; Tables;
  • Pagination: v.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00391665
  • Record Type: Publication
  • Report/Paper Numbers: 1317J
  • Files: TRIS, USDOT
  • Created Date: Jan 30 1985 12:00AM