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Validation and refinement of mixture volumetric material properties identified in superpave monitoring project II : phase II.
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  • Abstract:
    This study was initiated to validate and refine mixture volumetric material properties identified in the

    Superpave Monitoring Project II. It has been found that differences in performance are primarily controlled

    by differences in gradation and resulting volumetric properties between the mixtures. A set of performancerelated

    parameters and associated criteria have been developed based on analysis of the aggregates in the

    Dominant Aggregate Size Range and the Interstitial Component (DASR-IC). These parameters include

    DASR porosity, disruption factor (DF), effective film thickness (EFT), and the fine aggregate ratio (FAR).

    The porosity relates to the DASR, which has been found to be beneficial to improving both rutting and

    cracking resistance while DF, EFT, and FAR relate to the IC. This study focused on EFT and FAR

    parameters, which have not been validated. The study was to assess the effects of changes in interstitial

    volume (IV) characteristics on cracking performance. The main goal was to establish through extensive

    laboratory study clear implementable gradation and volumetric criteria for purposes of mixture design and

    construction specifications that will lead to consistently enhanced cracking performance. Laboratory test

    results from Superpave Indirect Tension Test (IDT) clearly showed that changes in IC gradation have an

    effect on mixture performance. The effect of changes in IC gradation on mixture properties were dependent

    on aggregate type and the characteristics of the aggregate. The two unmodified granite mixtures that met the

    preliminary established criteria exhibited the best mixture performance while all other granite mixtures

    exhibited marginal performance. Modification, however, helped to improve the underperforming granite

    mixtures except for excessively fine ICs. All the limestone mixtures had adequate performance and were

    relatively unaffected by modification. It was concluded that the preliminary volumetric criteria were

    effective, and their implementation would help to ensure consistently enhanced cracking performance. It

    may be possible to relax criteria if modified binder is used.

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