Marginal Aggregates in Flexible Pavements: Field Evaluation
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Marginal Aggregates in Flexible Pavements: Field Evaluation

Filetype[PDF-1.41 MB]


English
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Details:

  • Creators:
    Ahlrich, Randy C.
  • Corporate Creators:
    United States. Army Engineer Waterways Experiment Station
  • Corporate Contributors:
    United States. Federal Aviation Administration. Office of Aviation Research
  • Subject/TRT Terms:
  • Publication/ Report Number:
    DOT/FAA/AR-97/5
  • DOI:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    William J. Hughes Technical Center (U.S.)
  • NTL Classification:
    NTL-AVIATION-AVIATION;NTL-AVIATION-Airports and Facilities;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
  • Abstract:
    The purpose of this study was to evaluate the utilization of substandard or marginal aggregates in flexible pavement construction of airport pavements. This investigation was undertaken to evaluate the effects of using lower quality aggregates such as rounded uncrushed gravels and sands on the rutting of flexible pavements. The scope of this research study included a review of available literature and existing data (Phase I), a laboratory evaluation organized to determine the effects of marginal aggregates and potential techniques to upgrade these substandard materials (Phase II), and a field evaluation involving test sections utilizing the most promising techniques (Phase III). This report summarizes the field evaluation (Phase III) that was conducted to determine the effects of aggregate properties on rutting potential of marginal aggregate asphalt mixtures under actual aircraft loads. Based on the findings of the laboratory evaluation, seven aggregate blends and two asphalt binders were selected to evaluate marginal aggregate properties. The test section mixtures were selected to determine the effects of aggregate gradation, amount of crushed coarse aggregate and natural sand in the aggregate blend, and the benefits of asphalt modification. The findings of this laboratory evaluation indicated that asphalt rutting is influenced by multiple factors (i.e., aggregate properties, gradation, in-place voids, and binder stiffness) and cannot be predicted with individual aggregate and asphalt mixture properties. The data from the field test sections indicated the shape of the gradation curve, percentage of crushed coarse aggregate, and the amount of natural sand in the blend influence the rutting potential. Asphalt modification did not produce equivalent pavement performance in the marginal aggregate mixtures.
  • Content Notes:
    The U.S. Army Engineer Waterways Experiment Station conducted this study as part of the Inter-Agency Agreement Project “Durability Criteria for Airport Pavements.” Federal Aviation Administration William J. Hughes Technical Center COTR: Dr. Xiaogong Lee
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