Use of epoxy asphalt with reclaimed asphalt pavement (RAP) in new pavement mixture

Periodic maintenance and rehabilitation of asphalt pavements result in vast amounts of waste materials known as reclaimed asphalt pavement (RAP). The asphalt industry has been recycling RAP by putting it back in pavement for use, but the nationwide average percent RAP in asphalt mixtures has not increased in recent years, which remained at about 21% in 2019, due to the concern that increasing the RAP content may not warrant pavement performance. Therefore, there is a need to increase the reuse of RAP in road projects. The current designs of asphalt mixtures containing RAP typically use recycling agents or a softer asphalt binder to compensate for the brittleness of aged asphalt in RAP. The prior work by the PI has revealed the superior performance of epoxy asphalt in virgin asphalt mixtures. Epoxy asphalt is a thermosetting material that can improve asphalt mixture performance by one or several orders of magnitude. It, however, has not been explored for use in RAP mixtures. Based on the PI’s experience with epoxy asphalt, it is hypothesized that the use of epoxy asphalt in RAP mixtures can ensure that the mixtures perform equal to or better than asphalt mixtures with all virgin materials and a low percentage of epoxy asphalt suffices in RAP mixtures. If these hypotheses are validated, it may provide road agencies a new approach to design RAP mixtures and increase the use of RAP in road projects. The main objective of this proposed project is to validate the above hypotheses with the following tasks planned: (1) Perform a literature review of state-of-the-art and state-of-the-practice of RAP mixture and epoxy asphalt; (2) Develop and execute a laboratory experimental plan to evaluate the performance of RAP mixtures containing epoxy asphalt; and (3) Develop recommendations on the design and production of RAP mixtures with epoxy asphalt.

Language

  • English

Project

  • Status: Active
  • Funding: $146259
  • Contract Numbers:

    69A3551747119

  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Project Managers:

    Kline, Robin

  • Performing Organizations:

    University of South Florida, Tampa

    Department of Civil and Environmental Engineering
    4202 E. Flowler Avenue, ENB 118
    Tampa, FL  United States  33620-5350
  • Principal Investigators:

    Lu, Qing

  • Start Date: 20211001
  • Expected Completion Date: 20230430
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01781617
  • Record Type: Research project
  • Source Agency: Center for Transportation, Environment, and Community Health
  • Contract Numbers: 69A3551747119
  • Files: UTC, RIP
  • Created Date: Sep 14 2021 2:37PM