Laboratory evaluation of warm mix asphalt.
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Laboratory evaluation of warm mix asphalt.

Filetype[PDF-3.33 MB]

  • English

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    • 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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