Comparative Evaluation of 4-Inch and 6-Inch Diameter Specimens for Testing Large Stone Asphalt Mixes
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Comparative Evaluation of 4-Inch and 6-Inch Diameter Specimens for Testing Large Stone Asphalt Mixes

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English
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  • DOI:
  • Resource Type:
    Tech Report
  • TRIS Online Accession Number:
    00625354
  • Corporate Publisher:
    National Center for Asphalt Technology (U.S.)
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
  • Abstract:
    Increased incidence of premature rutting of heavy duty asphalt pavements has

    been experienced in recent years. There is a general agreement among most

    asphalt paving technologists that the use of large size stone in the binder and

    base courses will minimize or eliminate the rutting of heavy duty-pavements.

    However, the wide acceptance of the Marshall and Hveem mix design procedures

    inhibits the use of large stone mixes because these methods use standard 4-inch

    (101.6 mm) diameter specimens and limit the maximum aggregate size to one inch

    (25.4 mm).

    Modified Marshall equipment and Gyratory Testing Machine (GTM) are now available

    for compacting and testing 6-inch (152.4 mm) diameter specimens to accommodate

    aggregate up to 2-inch (50.8 mm) maximum size. However, some agencies continue

    to use 4-inch diameter specimens for mixes containing 1&1/2inch (38.1 mm)

    maximum size aggregate. This study compares the mix properties such as Marshall

    stability and flow, indirect tensile strength, and permanent deformation (from

    static creep test) obtained on 4-inch and 6-inch (101.6 and 152.4 mm) diameter

    specimens. Both Modified Marshall and GTM equipment were used to compact the

    specimens of these two sizes. The maximum aggregate size ranged from 1/2 to

    l&1/2-inches (12.5 to 38.1 mm).

    The test data indicates increased coefficient of variation when testing 4-inch

    (101.6 mm) specimens of the mix containing aggregate larger than one inch

    (25.4 mm) compared to 6-inch (152.4 mm) specimens. The 6-inch (152.4 mm)

    diameter specimens also had lower variability in creep test compared to 4-inch

    (101.6 mm) specimens. Laboratory and rationally derived data indicating the

    ratios by which stability and flow values increased is also given in the paper.

    It has been recommended to use 6-inch (152.4 mm) diameter specimens for large

    stone asphalt mixes.

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