McGahan, Jeremy (2005-12). The development of correlations between HMA pavement performance and aggregate shape properties. Master's Thesis. Thesis uri icon


  • The physical characteristics of aggregates (form, angularity, and texture) are
    known to affect the performance of hot mix asphalt (HMA) pavements. Efforts to
    develop relationships between these aggregate characteristics and aggregate performance
    in HMA pavements have been limited in the past due to inherent inaccuracies in the
    methods used to measure these characteristics. The recently developed Aggregate
    Imaging System (AIMS) offers an opportunity to accurately measure aggregate shape
    characteristics allowing them to be properly related to asphalt performance.
    This research focused on relating the aggregate characteristics of form,
    angularity, and texture measured using AIMS to laboratory performance measurements
    on a wide variety of HMA mixes. The performance of these mixes was evaluated in
    three projects carried out by the Federal Highway Administration (FHWA) and the
    Texas Transportation Institute (TTI). During this research, a database of the volumetric,
    performance, and aggregate shape measurements for mixes used in these projects was
    created. Statistical analysis was conducted to correlate HMA performance parameters to
    volumetric and aggregate shape characteristics. The results show the dominant effect
    that aggregate shape properties have on HMA performance.

publication date

  • December 2005