Development of a Gyratory Stability Index to Evaluate Variation of RAP Content and Rutting Resistance of Asphalt Mixtures

This project seeks to develop a modified mathematical algorithm for Gyratory Stability (GS) index applicable to the Pine Gyratory compactor with model AFG2AS which is being used at all ITD district, field, and central labs. The GS index can then be used to evaluate the resistance of hot mix asphalt (HMA) mixtures to rutting during the mixture design stage. Researchers will also examine the sensitivity of this index to the reclaimed asphalt pavement (RAP) content in asphalt mixtures. If found sensitive, the GS index can then be used as a quick indirect indicator of variation of RAP content in asphalt mixtures when placed in the field and as a tool to determine if the RAP content in a given mixture exceeds the allowable percentage. The study will investigate the applicability and sensitivity of American Association of State Highway and Transportation Officials (AASHTO) T 283, Lottman procedure, as a quality control tool during asphalt mixture production in the field.


  • English


  • Status: Completed
  • Funding: $160000
  • Contract Numbers:

    RP 280

  • Sponsor Organizations:

    Idaho Transportation Department

    P.O. Box 7129, 3311 West State Street
    Boise, ID  United States  83707-1129
  • Project Managers:

    Santi, Michael

  • Performing Organizations:

    National Institute for Advanced Transportation Technology

    University of Idaho, Moscow
    115 Engineering Physics Building
    Moscow, ID  United States  83844-0901
  • Principal Investigators:

    Kassem, Emad

    Bayomy, Fouad

  • Start Date: 20190101
  • Expected Completion Date: 20201231
  • Actual Completion Date: 20210831

Subject/Index Terms

Filing Info

  • Accession Number: 01703622
  • Record Type: Research project
  • Source Agency: Idaho Transportation Department
  • Contract Numbers: RP 280
  • Files: RIP, STATEDOT
  • Created Date: Apr 30 2019 2:40PM