United States Department of Transportation
i
Design and Performance of Open-Graded Friction Course (OGFC) Mixtures Containing Epoxy Asphalt
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2021-07-01
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[PDF-8.39 MB]
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Edition:Final Report, February 2019 – July 2021
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Abstract:The objective of this study was to determine the viability of using epoxy-modified asphalt (EMA) to improve the long-term durability and life span of open-graded friction course (OGFC) mixtures in Florida. To that end, a comprehensive literature review and laboratory experimental plan were conducted. The laboratory test procedure combining the storage stability test and Soxhlet asphalt extraction as well as the fluorescence microscopy were effective in evaluating the chemical compatibility of EMA binders. Low-dosage epoxy modification showed an overall stiffening effect on the base asphalt binders, but its improvement in their rheological properties was not as pronounced as styrene-butadiene-styrene modification. EMA OGFC mixtures showed improved raveling resistance and durability as the epoxy dosage rate (EDR) increased between 15% and 40%. Based on the results, 30% was recommended as the optimum EDR regarding material cost and mixture performance properties. After extended long-term aging, the EMA mixtures at 30% EDR and HP mixtures showed significantly better raveling resistance and durability than the PMA mixtures. All OGFC mixtures had acceptable Tensile Strength Ratio (TSR) test results regardless of the type of asphalt binder used. Two EMA mixtures exhibited high severity stripping failures in the Hamburg Wheel Tracking Test (HWTT), which was possibly due to of the lack of cohesive strength of the not fully cured EMA binder. Performance testing of dense-graded asphalt mixtures containing different types of artificial RAP materials suggested that EMA OGFC mixtures could be successfully recycled as RAP into new asphalt mixtures. Finally, recommendations for future research and implementation activities are provided.
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