2305 - Implement Balanced Asphalt Mix Design in Oklahoma

Moving toward a balanced mix design (BMD) approach for design of asphalt mixtures is a national effort. A BMD incorporates two or more mechanical tests to assess how well the mixture will resist common forms of distress. The Oklahoma Department of Transportation (ODOT) has decided to use the Semi-Circular Bend (SCB) test in conjunction with the Hamburg Wheel Test (HWT) to better evaluate asphalt mixtures. Adopting a BMD design approach should lead toward a less prescriptive approach to mix design and longer lasting, better performing asphalt pavements. Objectives: Performing a literature review will assist with selecting the most appropriate SCB test for ODOT, Oklahoma contractors, and testing laboratories. Evaluating selected ODOT mixtures will assist with determining test procedures, specifications and special provisions for evaluation and eventual adaptation in a BMD procedure for ODOT. Work Plan: Based on the literature review, determine if any modifications to the current SCB test standards are needed. This will include investigating mixture and/or sample aging procedures. Preliminary reviews have indicated this may impact the ability of the two SCB tests to identify the effects of high Reclaimed Asphalt Pavement (RAP) contents Reclaimed Asphalt Shingles (RAS). Once a test has been identified, consult with ODOT to select mix design samples, plant produced samples or both for evaluation using the SCB. Using existing mix design HWT data from ODOT is proposed. Anticipated Benefits: Development of draft specifications and draft supplemental specifications for a balanced mix design procedure for ODOT will move ODOT away from a voids based mix design procedure, allowing more innovative design concepts and producing longer lasting more durable and rut resistant pavements. Implementation: At the completion of the study ODOT will implement draft specifications and supplemental specifications on a trial basis in Oklahoma. Either the contractor or ODOT will be responsible for SCB testing. Any proposed specification limits will be validated by monitoring the mixtures for several years. Expected Deliverables: The Primary Investigator will supply copies of the draft final report and final report in two formats: Microsoft Word and in Americans with Disabilities Act accessible Adobe Acrobat pdf electronic format. The final report will contain recommendations for draft specifications and supplemental specifications for implementation of balanced mix designs in Oklahoma.


    • English


    • Status: Completed
    • Funding: $111332
    • Contract Numbers:


      SPR Implementation 2305

    • Sponsor Organizations:

      Oklahoma Department of Transportation

      200 NE 21st Street
      Oklahoma City, OK  United States  73105
    • Managing Organizations:

      Oklahoma Department of Transportation

      200 NE 21st Street
      Oklahoma City, OK  United States  73105
    • Project Managers:

      Suitor, Kevin

    • Performing Organizations:

      Oklahoma State University, Stillwater

      School of Civil & Environmental Engineering
      207 Engineering South
      Stillwater, OK  United States  74078
    • Principal Investigators:

      Cross, Stephen

    • Start Date: 20171001
    • Expected Completion Date: 20180930
    • Actual Completion Date: 20190831

    Subject/Index Terms

    • TRT Terms: Asphalt; Mix design
    • Subject Areas: Design; Materials; Pavements; Research; Transportation (General);

    Filing Info

    • Accession Number: 01656364
    • Record Type: Research project
    • Source Agency: Oklahoma Department of Transportation
    • Contract Numbers: SPRY-0010(071)RS, SPR Implementation 2305
    • Files: RiP, STATEDOT
    • Created Date: Jan 8 2018 2:04PM