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Mechanical Properties of Warm Mix Asphalt Prepared Using Foamed Asphalt Binders : Executive Summary Report
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    Executive summary report.
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  • Abstract:
    Hot mix asphalt (HMA) is a mixture containing aggregates and asphalt binders prepared at specified

    proportions. The aggregates and asphalt binder proportions are determined through a mix design

    procedure such as the Marshall Mix Design or the Superpave Mix Design methods. Overall, the goal of

    determining such proportions is to establish an HMA mixture that will meet specific performance criteria.

    In addition, it is imperative to ensure that the asphalt binder will fully coat the aggregates and that the

    resulting mixture is workable and compactable.

    In order to ensure sufficient aggregate drying and coating, both the asphalt binder and the aggregates are

    heated to elevated temperatures ranging between 300oF and 325oF. The use of such high temperatures

    would result in lowering the viscosity of the asphalt binder which is the main factor affecting the coating

    and workability of asphalt mixtures.

    In recent years, a new group of technologies have been introduced to the United States that allow

    producing asphalt mixtures at temperatures 30 to 100oF lower than what is used in HMA. This group of

    technologies is commonly referred to as Warm Mix Asphalt (WMA). They are promoted as

    environmentally friendly green alternatives to HMA mixtures as they produce lower greenhouse gas

    emissions. This new group of technologies aims at reducing the viscosity of the asphalt binder through

    the addition of organic or chemical additives or by introducing cool water into the heated molten asphalt

    under controlled temperature and pressure conditions, resulting in so-called foamed asphalt binder. As a

    consequence, lower temperatures are needed during production for the asphalt binder to be absorbed by

    the aggregates.

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