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Quantitative evaluation of stripping potential in hot-mix asphalt, using ultrasonic energy for moisture-accelerated conditioning McCann, Martin ; Sebaaly, Peter

By: Contributor(s): Publication details: Transportation Research Record, 2001Description: nr 1767, s. 48-59Subject(s): Bibl.nr: VTI P8167:1767Location: Abstract: The ultrasonic moisture-accelerated conditioning process is a quantitative analysis to establish the moisture sensitivity of any given hot-mix asphalt (HMA) pavement. While in a water bath at a constant 60 deg C, a sample from an HMA mix is conditioned by ultrasonic energy for a specified period of time. The repeated cycle of compression then cavitation accelerates the detachment and displacement of the asphalt binder from the aggregate's surface. The proportion of separated particles versus conditioning time has been statistically shown to have a unique linear relationship for each HMA mix. The test procedure was implemented on a variety of pavement mixtures and was found to distinguish among aggregate sources, different asphalt binders, specimens containing lime versus no lime, and variability in asphalt binder content. Simplicity of the ultrasonic moisture-accelerated conditioning process is attributed to the ease in which a sample is prepared and conditioned. Samples can be derived from pavement cores or used from briquettes after establishing the job mix formula. When submerged in the water bath and subjected to ultrasonic moisture-accelerated conditioning, the samples are subjected only to variables associated with moisture sensitivity: aggregate, asphalt binder, water, temperature, and energy.
Item type: Reports, conferences, monographs
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The ultrasonic moisture-accelerated conditioning process is a quantitative analysis to establish the moisture sensitivity of any given hot-mix asphalt (HMA) pavement. While in a water bath at a constant 60 deg C, a sample from an HMA mix is conditioned by ultrasonic energy for a specified period of time. The repeated cycle of compression then cavitation accelerates the detachment and displacement of the asphalt binder from the aggregate's surface. The proportion of separated particles versus conditioning time has been statistically shown to have a unique linear relationship for each HMA mix. The test procedure was implemented on a variety of pavement mixtures and was found to distinguish among aggregate sources, different asphalt binders, specimens containing lime versus no lime, and variability in asphalt binder content. Simplicity of the ultrasonic moisture-accelerated conditioning process is attributed to the ease in which a sample is prepared and conditioned. Samples can be derived from pavement cores or used from briquettes after establishing the job mix formula. When submerged in the water bath and subjected to ultrasonic moisture-accelerated conditioning, the samples are subjected only to variables associated with moisture sensitivity: aggregate, asphalt binder, water, temperature, and energy.

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