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Mid-America Transportation Center

Investigation of Synergistic Effects of Warm Mix Asphalt and High Fractionated Reclaimed Asphalt Pavement for Safe, Environmentally Sustainable Highway

Final Report
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Researchers

  • Principal Investigator: Hosin Lee (hlee@engineering.uiowa.edu 319-335-6818)
  • Project Status
    Complete
    About this Project
    Brief Project Description & Background
    The MATC research program is designed to address the United States Department of Transportation strategic goals of safety, good repair, economic competitiveness, and environmental sustainability of the U.S. surface transportation system. The proposed research investigates the synergistic effect of Warm Mix Asphalt (WMA) and high Fractionated reclaimed asphalt pavement (HiFrap) contents for their mix designs, dynamic moduli, flow characteristics and rutting under water. As a result of the proposed research, the environmentally sustainable WMA pavement with High RAP content with the improved state of good repair will contribute to the road safety and improve economic competitiveness of the U.S. surface transportation system.
    Research Objective
    The research goal is to evaluate the impacts of WMA with varying HiFrap contents on their fractionation methods, WMA-HiFrap mix design procedures, dynamic moduli and flow number and rutting characteristics. The research objectives are to: 1) apply a newly developed mix design procedure for HMA-HiFrap to WMA-HiFrap mix, 2) Measure the fundamental characteristics of WMA-HiFrap, and 3) Identify the synergistic effects between WMA and HiFrap.
    Potential Benefits
    The main product anticipated from this research is the identification of the synergistic effects between WMA and RAP materials (up to 100%) with respect to the mix design volumetrics, dynamic moduli, flow number and rutting potential under water. This information would be very useful for pavement engineers to identify the maximum possible RAP content for WMA and for contractors who are interested in adding as much RAP material as possible for WMA mixtures.
    Abstract
    More and more Warm Mix Asphalt (WMA) pavements are being constructed with Reclaimed Asphalt Pavement (RAP) contents. Currently, 10 to 20% of RAP materials are commonly used for WMA. In the future, it is anticipated that more highway pavements be constructed using the WMA with High Fractionated Reclaimed asphalt pavement contents (WMA-HiFrap). However, there is no comprehensive research done to identify the synergistic effects between WMA and high fractionated RAP and, therefore, it is critical to determine the relationships between the fundamental characteristics of WMA-HiFrap materials as a function of the increasing FRAP content up to 100%. In the proposed project, WMA with varying HiFrap contents will be evaluated with respect to their fractionation methods, WMA-HiFrap mix design procedures, dynamic moduli and flow number and rutting characteristics. As a result of the proposed research, the synergistic effects between WMA and RAP will be identified to help pavement engineers build the safe and environmentally sustainable U.S. surface transportation system with an improved state of good repair.
    Project Amount
    $ 60,000