Determination of Usable Residual Asphalt Binder in Rap

The current method adopted by the Illinois Department of Transportation (IDOT) for the design of HMA with RAP provides 100% contribution for the residual asphalt binder from the RAP based on solvent extractions. This means that the amount of virgin asphalt binder is reduced by the full amount of asphalt binder in the RAP for the percentage specified. This has recently been reported to be inaccurate and could result in an erroneous HMA job mix formula and cause dry HMA. Hence, the HMA becomes vulnerable to durability cracking and premature failure. Therefore, it is the objective of this study to determine the appropriate level of the residual asphalt binder in RAP to be considered as part of the design binder content.


    • English


    • Status: Completed
    • Contract Numbers:


    • Sponsor Organizations:

      Illinois Department of Transportation

      2300 S. Dirksen Parkway
      Springfield, IL  United States  62764
    • Performing Organizations:

      University of Illinois, Urbana-Champaign

      1105 Newmark Civil Engineering Lab, 205 North Matthews Avenue
      Urbana, IL  United States  61801
    • Principal Investigators:

      Carpenter, Samuel

      Al-Qadi, Imad

    • Start Date: 20060700
    • Expected Completion Date: 0
    • Actual Completion Date: 20080600
    • Source Data: RiP Project 13348

    Subject/Index Terms

    Filing Info

    • Accession Number: 01460402
    • Record Type: Research project
    • Source Agency: Illinois Department of Transportation
    • Contract Numbers: R27-11
    • Files: RiP
    • Created Date: Jan 3 2013 1:24PM