EXPERIENCE IN THE PACIFIC NORTHWEST WITH OPEN GRADED EMULSIFIED ASPHALT PAVEMENTS

Cold mixed open graded emulsified asphalt mixtures have been used successfully in the Pacific Northwest since 1966. Seven hundred miles of this type pavement have been constructed to date. Open graded emulsion mixtures have been successfully used elsewhere in the United States prior to this date, particularly in base course construction. Problems arise in the need for a low cost--high performance type of pavement. Elimination of construction practices which may be fire hazards within forested areas. Energy requirements are high and emissions controls difficult on portable hot-mix plants. Solutions include the development of a cold mixed open graded emulsified asphalt paving mixture. The benefits would be a paving mixture that is lower in cost than conventional hot mix dense graded bituminous concrete. Good serviceability--low maintenance. The course textured pavement surface allows for better drainage of water from pavement surfaces. The elimination of the aggregate drying and screening operation reduces plant costs and reduces dust pollution at the mixing plant site. A great savings in the energy requirements needed to produce the paving mixture is realized by the elimination of the aggregate screening operations and the need to maintain the liquid asphalt, at operating temperatures.

  • Supplemental Notes:
    • This implementation package is based on data gathered from projects constructed by numerous government agencies. These include County Road Departments, the U.S. Forest Service, the U.S. Bureau of Indian Affairs, the U.S. Bureau of Land Management, and the Region 10 Office of Federal Highways Projects of the FHWA. Implementation Manager: R.E. Olsen, HRS-22.
  • Corporate Authors:

    Office of Federal Highway Projects

    Region 10
    Vancouver, WA  USA 
  • Authors:
    • Richardson, E S
    • Liddle, W A
  • Publication Date: 1974-7

Media Info

  • Pagination: 31 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00264363
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Implementa Pkg, 74-3
  • Files: TRIS, USDOT
  • Created Date: Jan 9 1975 12:00AM