Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements [Fact Sheet]
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2023-09-01
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Abstract:Over the years, efforts have been made to identify test procedures with appropriate moisture conditioning methods to quantify the potential of moisture susceptibility in asphalt mixtures. Some of the most commonly used test procedures include Modified Lottman Test (AASHTO T 283), Hamburg Wheel-Track Test (AASHTO T 324), and visual strip rating tests conducted on loose mix such as Boiling Test (ASTM D3625). Moisture conditioning methods include hot water bath, freeze-thaw conditioning, and others. However, there is no agreement on how these tests assess the probability moisture damage will occur. In addition, to reduce the effects of moisture damage, some state DOTs required the use of antistripping agents, including liquid anti-strip (LAS) additives and hydrated lime, but reliable laboratory tests are still needed to insure acceptable improvement in resistance to moisture damage is achieved. The Ohio Department of Transportation (ODOT) has been proactive in addressing potential moisture susceptibility issues in asphalt mixtures by incorporating testing procedures during the mix design phase. However, multiple pavements in Ohio have shown stripping problems, particularly in areas where lower quality sources of aggregates are used. Therefore, there is a need to identify and/or refine mix test procedures that can provide results which correspond to in-place performance. In addition, ODOT needs guidance regarding the use of antistrip agents to determine if their use is a cost-effective solution to their current stripping problems.
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