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Abstract for presentation (Poster or Podium) with a Paper in the Conference Proceedings

Highway Pavements

Pioneering the Evaluation of Balanced Asphalt Mix Design and Performance Tests in Oklahoma

Monday, June 17, 2024
10:15 AM - 11:30 AM ET
Room: Galleria

    Co-Author(s)

  • Xue Yang, na

    PhD student
    Oklahoma State University
    Stillwater, Oklahoma, United States

    • Presenter(s)

  • Xue Yang, na

    PhD student
    Oklahoma State University
    Stillwater, Oklahoma, United States

    • Co-Author(s)

  • David Vivanco, PE

    Asphalt Branch Manager
    Oklahoma Department of Transportation
    Edmond, Oklahoma, United States

    • Primary Author(s)

  • Joshua Q. Li, PhD, PE

    Associate Professor Williams Professor
    Oklahoma State University
    Stillwater, OK, United States

    • Co-Author(s)

  • SC

    Steve Cross, na

    Emeritus Professor
    Oklahoma State University
    Stillwater, Oklahoma, United States

    • Submitter(s)

  • Joshua Q. Li, PhD, PE

    Associate Professor Williams Professor
    Oklahoma State University
    Stillwater, OK, United States

Abstract:

There is a national effort, including the Oklahoma Department of Transportation (ODOT), to move toward a balanced mix design (BMD) approach for the design of asphalt mixtures. This paper presents the findings of ODOT’s Phase I implementation of BMD in Oklahoma, whose objective was to evaluate selected ODOT mixtures to assist with determining test procedures, specifications, and special provisions for evaluation and eventual adaptation of a BMD procedure for ODOT. The test plan was developed by ODOT and consisted of evaluating I-FIT test results from 31 existing mixes and I-FIT and Ideal CT Index tests from nine mixes from three ODOT projects. The nine mixes consisted of three control mixes and six BMD mixes. Inconsistent results were found from the testing within and between the data sets. BMD mixes differed from control mixes by the addition of RAP, increased VMA, and increased asphalt content. Many of these high VMA BMD mixes collapsed in the field resulting in void properties below specification limits. It is recommended that ODOT consider adopting the Ideal CT test due to ease of testing and perform this testing on all mix designs submitted for use on ODOT projects. The data should be analyzed to determine what mix factors impact test results and to determine where ODOT mixes fall on the scale of CT Index results.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Presents the findings of ODOT’s Phase I implementation of BMD in Oklahoma
  • Evaluate selected ODOT mixtures to assist with determining test procedures, specifications, and special provisions for evaluation and eventual adaptation of a BMD procedure for ODOT
  • Propose the recommendation for BMD implementation in Oklahoma