Develop Guidelines and Design Program for Hot-Mix Asphalts Containing RAP, RAS, and Other Additives through a Balanced Mix-Design Process

University of Texas at El Paso (UTEP) will provide TxDOT with an Asphalt Concrete (AC) mix design program and guidelines to determine the optimum recycled asphalt pavement (RAP), recycled asphalt shingles (RAS), and additives content for designing balanced mixes without compromising the quality and performance of the final product. During this project, the university will: 1. Evaluate current mix designs, design processes and guidelines for use of RAP, RAS, and additives on AC mixes in Texas and worldwide to identify weaknesses and strengths of current practices for balanced mix designs involving RAP, RAS, and other additives. 2. Gather laboratory and field performance of sections studied under Research Project 0-6679. These sections are identified as historical and in-service sections (sections to be determined by Texas Department of Transportation (TxDOT)) constructed with and without RAP, RAS, and additives. 3. Determine correlation of laboratory results to pavement sections studied under Research Project 0-6679 (chosen by TxDOT) using performance indicators from tests such as the overlay tester (OT) and Hamburg wheel tracking device (HWTD) and strength parameters like the Indirect Tensile strength from past research projects to implement a protocol for a balanced cracking and rutting resistant mix containing RAP, RAS, and other additives. 4. Evaluate at least 15mixes used by TxDOT through a factorial experiment to assess the influence of RAP, RAS, and additives on the performance of balanced Hot Mix Asphalt (HMA) mixes. 5. Evaluate the feasibility of an AC mix design process that not only consider the raw and recycled materials but also incorporates the structural design of the pavement section to reliably characterize the performance of the designed AC mix. 6. Develop a design program for TxDOT pavement designers and engineers to determine the optimum RAP, RAS, and additive contents on AC mixes with varying aggregate type, asphalt content and grade and (if feasible) structural design of the pavement.


  • English


  • Status: Active
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    11th and Brazos Streets
    Austin, TX  United States  78701
  • Project Managers:

    Jensen, Darrin

  • Performing Organizations:

    University of Texas, El Paso

    El Paso, TX  United States  79968
  • Principal Investigators:

    Nazarian, Soheil

  • Start Date: 20160621
  • Expected Completion Date: 20190831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01618957
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6923
  • Files: RiP, STATEDOT
  • Created Date: Dec 20 2016 11:05AM