Evaluation of Warm Mix Asphalt Technology in Flexible Pavements

More than 90 percent of the roads in the United States (US) are surfaced with asphalt. The asphalt industry produces 500 million tons of jot mix asphalt (HMA) annually in the US. Highway construction consumes a great amount of material (aggregates and asphalt) and energy (production and transportation). The proposed research will focus on utilizing warm mix asphalt (WMA) technology that allows a reduction in temperatures at which asphalt mixes are produced and placed. This technology also promises to enable the use of higher reclaimed asphalt pavement (RAP) contents due to lower mixing and compaction temperatures required of these mixes. Furthermore, the decrease in energy required in producing and placing HMA mixtures will have a positive economic impact particularly with rising petroleum prices that will very likely persist well into the future. One key advantage to lowering mixing temperatures is that is reduces the effects of premature aging of HMA mixtures during production, thereby increasing the fatigue life. Another key advantage of using WMA technology is the reduction in emission levels, which makes it ideal for non-attainment areas that are struggling to meet the strict air quality standards. However, it is noted that lowering the mixing temperatures in WMA technology may increase the risk of a higher moisture level within the aggregate structure. This can cause a weakening of the asphalt mixture due to stripping. The primary goal of this research project is to quantify the performance of field produced and placed mixtures that utilize WMA technology and develop a framework for design, construction and implementation of this technology in Louisiana. This research also proposes to examine moisture effects in WMA mixtures as a result of lowering mixing temperatures.

    Language

    • English

    Project

    • Status: Active
    • Funding: $413556.00
    • Contract Numbers:

      30000117

      07-1B

    • Sponsor Organizations:

      Louisiana Transportation Research Center

      4101 Gourrier Avenue
      Baton Rouge, LA  United States  70808

      Louisiana Department of Transportation

      P.O. Box 94245
      1201 Capitol Access Road
      Baton Rouge, LA  United States  70804-9245
    • Project Managers:

      Morvant, Mark

    • Performing Organizations:

      Louisiana Transportation Research Center

      4101 Gourrier Avenue
      Baton Rouge, LA  United States  70808
    • Principal Investigators:

      Mohammad, Louay

      King, William

    • Start Date: 20090315
    • Expected Completion Date: 0
    • Actual Completion Date: 20110315
    • Source Data: RiP Project 24074

    Subject/Index Terms

    Filing Info

    • Accession Number: 01464080
    • Record Type: Research project
    • Source Agency: Louisiana Transportation Research Center
    • Contract Numbers: 30000117, 07-1B
    • Files: RiP, STATEDOT
    • Created Date: Jan 3 2013 2:35PM