Effects of Aggregate Angularity on Mix Design Characteristics and Pavement Performance
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Effects of Aggregate Angularity on Mix Design Characteristics and Pavement Performance

Filetype[PDF-2.15 MB]


English
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  • Creators:
  • Corporate Creators:
    University of Nebraska--Lincoln. Dept. of Civil Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    MPM-10
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    Nebraska Transportation Center
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
  • Abstract:
    This research targeted two primary purposes: to estimate current aggregate angularity test methods and to evaluate current

    aggregate angularity requirements in the Nebraska asphalt mixture/pavement specification. To meet the first research

    objective, various aggregate angularity tests were estimated with the same sets of aggregates and were compared by

    investigating their characteristics on testing repeatability, cost, testing time, workability, and sensitivity of test results. For

    the second objective, the effect of aggregate angularity on mixture performance was investigated by conducting

    laboratory performance tests (the uniaxial static creep test and the indirect tensile fracture energy test) of five mixes

    designed with different combinations of coarse and fine aggregate angularity, and statistical analyses of five-year asphalt

    pavement analyzer test results of field mixtures. Results from the indirect tensile fracture energy test were then

    incorporated with finite element simulations of virtual specimens, which attempted to explore the detailed mechanisms of

    cracking related to the aggregate angularity. Results from the estimation of various angularity test methods implied that

    for the coarse aggregate angularity measurement, the AASHTO T326 method was an improvement over the current

    Superpave method, ASTM D5821, in that it was more objective and was very simple to perform with much less testing

    time. For the fine aggregate angularity measurement, the current Superpave testing method, AASHTO T304, was

    considered reasonable in a practical sense. Rutting performance test results indicated that higher angularity in the mixture

    improved rut resistance due to better aggregate interlocking. The overall effect of angularity on the mixtures’ resistance to

    fatigue damage was positive because aggregate blends with higher angularity require more binder to meet mix design

    criteria, which mitigates cracking due to increased viscoelastic energy dissipation from the binder, while angular particles

    produce a higher stress concentration that results in potential cracks. Finite element simulations of virtual specimens

    supported findings from experimental tests. Outcomes from this research are expected to potentially improve current

    Nebraska asphalt specifications, particularly for aggregate angularity requirements and test methods to characterize local

    aggregate angularity.

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