Recycled Asphalt Shingles in Asphalt Pavements

Approximately 1,000,000 tons of shingles are added to landfills in the United States each year, and these shingles typically contain a significant portion of asphalt binder. Because of the rising cost of asphalt binder, which is the most expensive component of asphalt pavements, this resource could be tapped as an environmentally friendly way to reduce the necessary amount of virgin binder in asphalt paving mixtures. Recently, a number of states have been involved in the evaluation and implementation of Recycled Asphalt Shingles (RAS) as an efficient means for reducing paving costs and wisely using a product that would otherwise be considered a waste material. Most states limit the use of RAS to 5% manufacturer scrap shingles, although some do allow the inclusion of tear-off (post-consumer) shingles. The state of Missouri has been a leader in the RAS field, allowing up to 7% RAS (including tear-offs), and has reported 20-25% reductions in asphalt binder requirements, as well as overall savings of $3 to $5 per ton of asphalt. Many states have performed RAS trial projects, and have reported successful results. In most cases, the sections containing shingles show similar or better performance than the control sections. The primary concerns for RAS mixes are the processing of the shingles, the quality and consistency of the material when added to the mix, appropriate limits for mix design, and the potential adverse effects resulting from any hardening of the asphalt binder that may have occurred in the RAS product. Some states have expressed significant concerns of asbestos contamination, although testing has shown this threat to be minimal.

    Language

    • English

    Project

    • Status: Active
    • Funding: $240000.00
    • Contract Numbers:

      TRC-1101

    • Sponsor Organizations:

      University of Arkansas, Fayetteville

      Board of Trustees
      Fayetteville, AR  United States 
    • Project Managers:

      Tamayo, Sarah

    • Performing Organizations:

      University of Arkansas, Fayetteville

      Board of Trustees
      Fayetteville, AR  United States 
    • Principal Investigators:

      Hall, Kevin

      Williams, Stacy

    • Start Date: 20100701
    • Expected Completion Date: 0
    • Actual Completion Date: 0
    • Source Data: RiP Project 30040

    Subject/Index Terms

    Filing Info

    • Accession Number: 01543069
    • Record Type: Research project
    • Source Agency: Arkansas State Highway and Transportation Department
    • Contract Numbers: TRC-1101
    • Files: RiP
    • Created Date: Nov 4 2014 1:01AM