HOT-MIX RECYCLING KEEPS INTERSTATE REHAB COSTS DOWN IN WASHINGTON STATE

The Washington State Department of Transportation has found that recycling asphalt pavement on the Interstate highway system is most cost effective. Recently completed was a 12-mile (19 km) project on Interstate 90 east of Ellensburg. This project raised to approximately 560 the total number of lane miles (900 km) of Interstate highways that Washington State has rehabilitated by this method. On the subject project, all four lanes were milled to a depth of 1.8 in. (45 mm). This was a total of 48 lane miles (77 km). The contractor, the Watson Asphalt Paving Company of Redmond, Washington, elected to use a 60/40 blend of Reclaimed Asphalt Pavement (RAP) and virgin aggregate. With this high percentage of RAP in the mix, the Laboratory determined that the contractor's proposed use of a medium grade of hot recycling agent, RA-250, was acceptable as the added binder in the recycled mixture. The Watson Company's brand-new and fully-automated CMI recycled drum-mix plant was able to produce the mix at an average rate of 450 tons (410 tonnes) per hour. The recycled mix was placed back int he milled sections to a depth of 1.8 in. (45 mm), and then the entire surface was provided with a new open-graded hot-mix asphalt frictioncourse. The option of allowing hot-mix recycled asphalt concrete to be used has proven most cost effective. It is anticipated that this process will continue to play a major role in the rehabilitation of asphalt pavements in the State of Washinton. (Author)

• Corporate Authors:

  Asphalt Institute

  2696 Research Park Drive
  Lexington, KY  United States  40511-8480
• Authors:
  • Walter, J P
• Publication Date: 1985-8

Media Info

• Pagination: p. 1
• Serial:
  • Asphaltnews
  • Volume: 8
  • Issue Number: 3
  • Publisher: Asphalt Institute

Subject/Index Terms

• TRT Terms: Asphalt pavements; Cold working; Driver rehabilitation; Hot mix asphalt; Milling; Pavements; Recycling
• Uncontrolled Terms: Rehabilitation
• Old TRIS Terms: Recycled pavements
• Subject Areas: Construction; Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00451777
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 27 2004 9:58PM