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Laboratory evaluation of warm mix asphalt.
  • Published Date:
    2011-09-14
  • Language:
    English
Filetype[PDF-3.33 MB]


Details:
  • Corporate Contributors:
  • Publication/ Report Number:
    RC-1556
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • Abstract:
    "Hot Mix Asphalt (HMA) has been traditionally produced at a discharge temperature of between

    280°F (138°C) and 320° F (160°C), resulting in high energy (fuel) costs and generation of greenhouse

    gases. The goal for Warm Mix Asphalt (WMA) is to use existing HMA plants and specifications to

    produce quality dense graded mixtures at significantly lower temperatures. Europeans are using WMA

    technologies that allow the mixture to be placed at temperatures as low as 250°F (121°C). It is reported

    that energy savings on the order of 30%, with a corresponding reduction in CO2 emissions of 30%, are

    realized when WMA is used compared to conventional HMA. Although numerous studies have been

    conducted on WMA, only limited laboratory experiments are available and most of the current WMA

    laboratory test results are inconsistent and not compatible with field performance The main objectives of

    this study are: The main objectives of this study are: 1) review and synthesize information on the

    available WMA technologies; 2) measure the complex/dynamic modulus of WMA and the control

    mixtures (HMA) for comparison purpose and for use in mechanistic-empirical (ME) design comparison;

    3) assess the rutting and fatigue potential of WMA mixtures; and 4) provide recommendation for the

    proper WMA for use in Michigan considering the aggregate, binder, and climatic factors. The testing

    results indicated that most of the WMA has higher fatigue life and TSR which indicated WMA has better

    fatigue cracking and moisture damage resistant; however, the rutting potential of most of the WMA

    tested were higher than the control HMA. In addition, the WMA design framework was developed based

    on the testing results, and presented in this study to allow contractors and state agencies to successfully

    design WMA around the state of Michigan."

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