Synthesis of Information Related to Highway Problems. Topic 46-05. Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures

The practice of utilizing reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in new asphalt mixtures has increased in recent years due to its economic and environmental benefits. RAP has already become one of the most widely used materials in the United States, while RAS has emerged as a material of interest to the paving community. With increased demand and limited supply of aggregate and binder, asphalt producers have begun using RAP and RAS as valuable components in asphalt mixtures. Though the potential benefits are high, few state agencies have proceeded to use high percentages of RAP on their roadways. This is often attributed to the non-uniformity of RAP materials, as well as an agency's lack of confidence in the long term performance data and specifications. This problem is further augmented when RAS is used in conjunction with RAP in preparing asphalt mixtures. Different state agencies have their own guidelines with specifications for the allowable percentage of both RAP and/or RAS in asphalt mixtures. Further, a number of state departments of transportation (DOTs) have some level of experience using RAS in asphalt mixtures. The scope of this synthesis study is to summarize current practices and agency specifications for the use of RAP and/or RAS in the design, production, and construction of new asphalt mixtures. Results will benefit government agencies, researchers, and the asphalt industry in providing guidance on successful practices. It is hoped that these practices can be used by agencies when developing highway specifications for producing and maintaining quality asphalt pavements. This synthesis will include a literature review and a survey of state transportation agencies. Information from other federal and local entities, industries, and academia with interest in RAP and/or RAS, as well as international agencies' experiences shall be reviewed and included as available. From the results of the survey, a minimum of 3 to 5 agencies will be selected and case examples of their practices will be developed. Lessons learned and gaps in information will also be covered.


  • English


  • Status: Active
  • Funding: $40000.00
  • Contract Numbers:

    Project 20-05, Topic

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program (NCHRP) Synthesis

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001
  • Project Managers:

    Vlasak, Donna

  • Performing Organizations:

    Gardiner Technical Service LLC

  • Principal Investigators:

    Stroup-Gardiner, Mary

  • Start Date: 20140912
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 37612

Subject/Index Terms

Filing Info

  • Accession Number: 01543464
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic
  • Files: TRB, RiP
  • Created Date: Nov 15 2014 1:00AM