United States Department of Transportation
i
Performance based selection of RAP-RAS in asphalt mixtures.
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2015-12-01
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Abstract:Asphalt pavement technology has been driven by a desire to reduce the consumption of virgin oil
products and improve the sustainability of vital ingredients required to produce pavement. The goal of
the research study described in this report is to develop a strategy to select the type/quantity of recycled
material, and PG grade for the virgin binder, of an asphalt mix to provide optimum performance in a
given environment. This study compared the performance one mix design with five different quantities
and combinations of recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) using an
Asphalt Mixture Performance Tester (AMPT). Three different PG graded binders were utilized.
Based on the measurements of dynamic modulus and phase angles from the AMPT, it was concluded
that a high RAP mixture with a soft binder grade could perform similarly to a low RAP mixture with a
harder binder grade. Mixtures using RAS have different performance characteristics than those using
RAP only. These mixtures were less susceptible to changes in loading frequency and temperature.
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