United States Department of Transportation
i
Mitigating Stripping in Asphalt Mixtures
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2022-05-01
[PDF-16.01 MB]
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Edition:Final Report July 2019 – May 2022
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Abstract:Moisture damage is one of the major types of asphalt pavement distress along with rutting, fatigue cracking and low-temperature cracking. Moisture, in liquid or gas form, penetrates into the interface between aggregate and asphalt and strips aggregate particles of asphalt coating, resulting in stripping and raveling. The Tennessee Department of Transportation (TDOT) has long been striving to mitigate moisture damage in its asphalt pavements through performance testing and use of liquid anti-strip agents. However, moisture damage is still observed despite these efforts. Moisture damage leads to stripping of the asphalt cement from the aggregate which in turn leads to a loss of structure in the pavement. Therefore, there is an urgent need to better identify methods to reduce moisture susceptibility of asphalt mixtures. This study explored the mechanism of moisture damage by measuring the thermodynamic properties of both asphalts and aggregates. The energy ratios indicating the compatibility and moisture resistance of different asphalt-aggregate combinations were compared to other laboratory performance test results. The effect of asphalt aging and antistripping agents on moisture susceptibility was also evaluated. In addition, the modified boiling test based on image analysis was developed for the evaluation of loose asphalt mixtures.
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