Development of Quality Standards for Inclusion of High Recycled Asphalt Pavement Content in Asphalt Mixtures TR-770

The main purpose of the proposed research is to develop a mix design procedure for high RAM mixtures with both rejuvenators and fractionated RAM materials for Iowa Department of Transportation (Iowa DOT) and local public agencies by thoroughly understanding complex interactions between fractionated RAM and rejuvenators. Main objectives of this research are to: 1) examine the effects of various rejuvenators and different methods of RAP stockpile fractionation on the volumetric mix design properties, 2) evaluate long-term oven aging of both laboratory and field rejuvenated/fractionated high RAM mixtures and 3) develop specifications for evaluating asphalt mixtures with rejuvenators and high fractionated RAM contents. The previous study identified the analytical method to find the most appropriate rejuvenators for Iowa’s high RAP mixtures, which are resistant to both low temperature cracking and rutting. For the proposed study, research findings from the previous phase will be expanded to cover not only high binder replacement with rejuvenators but also the aggregate replacement with the fractionated RAM. The proposed research will be performed in six tasks.


    • English


    • Status: Active
    • Funding: $247480
    • Contract Numbers:


    • Sponsor Organizations:

      Iowa Department of Transportation

      800 Lincoln Way
      Ames, IA  United States  50010
    • Managing Organizations:

      University of Iowa, Iowa City

      102 Church Street
      Iowa City, IA  United States  52242
    • Project Managers:

      Goetz, Vanessa

    • Principal Investigators:

      Lee, Hosin

    • Start Date: 20190201
    • Expected Completion Date: 20210228
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01691607
    • Record Type: Research project
    • Source Agency: Iowa Department of Transportation
    • Contract Numbers: TR-770
    • Files: RIP, STATEDOT
    • Created Date: Jan 28 2019 10:51AM