Effect of Mix Gradation on Rutting Potential of Dense-Graded Asphalt Mixtures

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  • 8/9/2019 Effect of Mix Gradation on Rutting Potential of Dense-Graded Asphalt Mixtures

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    Kandhal, P.S. and R.B. Mallick. Effect of Mix Gradation on Rutting Potential of

    Dense-Graded Asphalt Mixtures. Transportation Research Board,

    Transportation Research Record 1767, 2001.

    ABSTRACT

    A study was conducted to evaluate the effect of mix gradations, both complying with

    and violating the Superpave restricted zone, on rutting potential of hot-mix asphalt.

    Superpave gyratory samples of mixes with granite, limestone, and gravel aggregates

    were used. The following gradations were used: gradation above the restricted zone,

    gradation through the restricted zone in close proximity to the maximum density line,

    and gradation below the restricted zone. Rut tests were conducted at 64 deg C with the

    asphalt pavement analyzer under 689-kPa contact pressure and 45.2-kg wheel load.

    Rut depths were measured at the end of 8,000 cycles. Repeated shear tests at a

    constant height were also conducted with the Superpave shear tester. Statisticalanalysis of rut data generally indicates a significant difference between rut depths

    obtained in mixes using different aggregate types and gradations. The gradations

    violating the restricted zone did not necessarily give relatively higher rut depths

    compared with the gradations in compliance with the zone.