Enhancing the Performance of Asphalt Mixtures Containing High RAP Content with the Use of Different WMA Technologies

The term Warm Mix Asphalt (WMA) refers to various technologies that allow reducing mixing and compaction temperatures of asphalt mixtures without negatively affecting their performance against common major distress types. WMA technologies include foaming process, chemical additives, and organic (wax) additives. Application of WMA technologies was found to reduce production and construction costs, extend construction season, improve field compaction, and enhance working conditions by reducing exposure to fuel emissions, fumes, and odors. In this study, three additives/technologies will be evaluated to perform concurrently as a WMA technology and as a rejuvenator. To this end, Sasobit (organic), Evotherm (chemical), and Advera (foaming) will be used to prepare different asphalt mixtures with high contents of reclaimed asphalt pavement (RAP). The Louisiana Department of Transportation and Development (LaDOTD) allows only 15 to 20% of RAP in asphalt mixtures with a nominal maximum aggregate size of 0.5 in (12.5 mm) and 0.75 in (19 mm). The mixtures that will be produced in this study will contain 25 and 35% RAP to investigate the effects of using these WMA technologies on the performance of mixtures with high RAP content. The prepared mixtures will be short- and long-term oven aged and will then be tested against permanent deformation and moisture damage using the Loaded Wheel Tracker (LWT) test at high temperature and against cracking using the Semi-Circular Bending (SCB) test at intermediate temperature. Furthermore, the rheological properties of the extracted and recovered binders from the prepared mixtures will be evaluated using Dynamic Shear Rheometer (DSR) and will be correlated to the mixtures testing results. The results of these laboratory tests will be compared to those of a control HMA and WMA mixture to evaluate the effects of using WMA additives on the mix performance.

Language

  • English

Project

  • Status: Active
  • Funding: $105094
  • Contract Numbers:

    19BLSU01

  • 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:

    Transportation Consortium of South-Central States

    Louisiana State University
    Baton Rouge, LA  United States  70803
  • Project Managers:

    Melson, Christopher

  • Performing Organizations:

    Louisiana State University and A&M College

    202 Himes Hall
    Baton Rouge, LA  United States  70803
  • Principal Investigators:

    Sadek, Husam

    Hassan, Marwa

    Berryman, Charles

  • Start Date: 20190815
  • Expected Completion Date: 20210515
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers Program

Subject/Index Terms

Filing Info

  • Accession Number: 01713224
  • Record Type: Research project
  • Source Agency: Transportation Consortium of South-Central States
  • Contract Numbers: 19BLSU01
  • Files: UTC, RiP
  • Created Date: Aug 5 2019 4:14PM