Implementation of Balanced Mix Design of Asphalt Mixtures Prepared with Reclaimed Asphalt Pavements and Rejuvenators for Enhanced Performance

The Idaho Transportation Department (ITD) is interested in utilizing performance-based testing for asphalt mixtures used in construction. A previous ITD research project (RP 261) recommended adoption of a balanced mix design approach utilizing tests aimed at assessing the rutting and cracking performance of asphalt mixtures in Idaho. RP 261 proposed performance thresholds to ensure adequate resistance to cracking, rutting, and moisture damage. This study will check the proposed performance thresholds for additional mixtures produced in the state and revise the thresholds as needed. As part of the study, researchers will also study the use of rejuvenators to improve the performance of reclaimed asphalt pavement (RAP) mixtures and increase its content without compromising the performance of asphalt mixtures. The objectives of this project include: (1) Evaluating and validating the performance thresholds developed in previous ITD research project RP 261 for additional asphalt mixtures currently produced in the state. (2) Evaluating the effect of rejuvenators on improving the performance of asphalt mixtures containing different percentages of RAP and reducing the need for softer binders which are costly to obtain. (3) Applying the balanced (engineered) mix design concept and performance thresholds, developed in RP 261, to optimize the mix design (e.g., binder content and gradation) of hot mix asphalt (HMA) prepared with RAP and rejuvenators for improved performance. (4) Studying the economic savings of using rejuvenators and RAP in asphalt mixtures. (5) Developing recommendations and guidelines on revising performance thresholds developed in RP 261 (if needed) and incorporating rejuvenators and RAP into asphalt mixtures that provide comparable or superior performance to control mixtures.


    • English


    • Status: Active
    • Funding: $170000
    • Contract Numbers:

      RP 292

    • Sponsor Organizations:

      Idaho Transportation Department

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

      Copeland, Michael

    • Performing Organizations:

      National Institute for Advanced Transportation Technology

      University of Idaho, Moscow
      115 Engineering Physics Building
      Moscow, ID  United States  83844-0901

      Boise State University, Boise

      Department of Civil Engineering
      ET 201B
      Boise, ID  United States  83725
    • Principal Investigators:

      Kassem, Emad

      Bayomy, Fouad

      Lu, Yang

    • Start Date: 20200901
    • Expected Completion Date: 20220831
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01759918
    • Record Type: Research project
    • Source Agency: Idaho Transportation Department
    • Contract Numbers: RP 292
    • Files: RIP, STATEDOT
    • Created Date: Dec 11 2020 10:10AM