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Use of moisture induced stress testing to evaluate stripping potential of hot mix asphalt (HMA).
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  • Abstract:
    Stripping of hot mix asphalt (HMA) in the field is an ongoing issue for many Departments of Transportation

    (DOTs). A leading cause of stripping is hydraulic scouring. The Moisture Induced Stress Tester (MIST) is a recently

    developed technology that applies alternating pressure and vacuum cycles to submerged asphalt samples to mimic

    hydraulic scouring. The objective of this study was to differentiate six HMA mixes used by Maine DOT in terms of

    their moisture susceptibility using the latest MIST technology and field cores. Half of the field cores were

    conditioned in the MIST. Before and after conditioning visual observations were made, and the bulk specific gravity

    and resilient modulus were determined using the CoreLok and ASTM D4123, respectively. All conditioned and

    unconditioned samples were tested for indirect tensile strength (ITS) in accordance with ASTM D 6931. Values

    from before and after conditioning were compared by HMA mix. It was determined that the MIST conditioning

    process does cause moisture damage to the samples in a manner that mimics hydraulic scouring. It is recommended

    that further research be carried out to investigate the effect of the MIST on HMA cores, and that parameters be

    developed for characterizing the results of the MIST conditioning process. These results would also help in the

    development of standard specifications for the use of MIST.

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