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Wetting characteristics of asphalt binders at mixing temperatures.
  • Published Date:
    2013-10-01
  • Language:
    English
Filetype[PDF-6.32 MB]


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Wetting characteristics of asphalt binders at mixing temperatures.
Details:
  • Publication/ Report Number:
    SWUTC/13/600451-00062-1
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  • Abstract:
    Conventional hot mix asphalt (HMA) is produced by heating the aggregate and the asphalt binder to elevated

    temperatures that are typically in the range of 150C to 160C. These temperatures ensure that the viscosity of the

    asphalt binder is low enough to effectively coat the aggregate particles. During the past decade, warm mix asphalt

    (WMA) has been introduced to reduce the mixing temperatures by approximately 30C compared to HMA. Workability

    at these reduced temperatures is typically achieved by the use of chemical additives in the asphalt binder or by foaming

    the asphalt binder using small percentages of water. The use of WMA is associated with advantages such as reduced

    emissions during mixture production, extended paving season and reduced aging in the asphalt binder. In case of the

    WMA and the HMA, one of the important physical properties that dictates the quality of coating is the surface tension

    of the asphalt binder at mixing temperatures. In this study, the surface tension of different liquid asphalt binders was

    measured at typical mixing temperatures. The effect of binder type, temperature, and chemical additives used to

    produce WMA on the surface tension of the binder was evaluated. Three different binders with and without three

    different chemical additives were used in this study. The dynamic surface tension was measured using four different

    rates of surface formation and at several different temperatures within the range of 140C and 170C. Results show that

    the surface tension of asphalt binder depends on the rate of surface formation, temperature and source of the asphalt

    binder. Dynamic surface tension of asphalt binders suggests that asphalt binders behave similar to surfactants. The

    addition of chemical warm mix additives did not significantly reduce the surface tension of the binder compared to the

    control.

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