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Evaluation of superpave mixtures containing hydrated lime.
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  • Abstract:
    The use of hydrated lime in Hot-Mix Asphalt (HMA) mixtures can reduce permanent deformation, long-term aging, and moisture

    susceptibility of mixtures. In addition, hydrated lime increases the stiffness and fatigue resistance of mixtures. This study evaluated

    (1) the fundamental engineering properties of HMA mixtures containing hydrated lime as compared to conventional mixtures

    designed to meet the current Louisiana Superpave specifications and (2) the influence of the method of addition of hydrated lime on

    the mechanical properties of HMA mixtures. A Louisiana Superpave 19.0 mm Level II HMA mixture design was utilized. Siliceous

    limestone aggregates and three asphalt binders, a neat PG 64-22 and two Styrene-Butadiene (SB) polymer modified binders meeting

    Louisiana specifications for PG 70-22M and PG 76-22M were included. Based on the same mixture design, three conventional and

    six hydrated lime treated HMA mixtures were developed. The conventional mixtures contained no hydrated lime and the three

    aforementioned asphalt binders respectively. The lime treated mixtures were produced by incorporating hydrated lime into the HMA

    mixture in two ways: “slurry” or “paste” method when hydrated lime was mixed with the aggregate as slurry and “dry” or “no-paste”

    method when dry hydrated lime was blended with the asphalt binders. For each lime treatment method, three HMA mixtures were

    produced using the three identical asphalt cements (PG 64-22, PG 70-22M, and PG 76-22M) utilized in the three conventional

    mixtures. The overall results from mechanistic tests on HMA mixtures and rheological tests on asphalt binders indicated that the

    addition of hydrated lime improved the permanent deformation characteristics of the HMA mixtures. This improvement was

    substantial particularly at higher testing temperatures for mixtures containing polymer modified asphalt binders.

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