United States Department of Transportation
i
Laboratory evaluation of characteristics of recycled asphalt pavement in Kansas : technical summary.
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2011-09-01
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[PDF-504.48 KB]
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Edition:Technical summary.
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Abstract:The use of recycled asphalt pavement (RAP) has been in practice since the 1930s and is necessary to reduce the construction cost due to rising prices of virgin aggregates and binder, to conserve these rapidly depleting resources, and to minimize problems associated with disposal of aged mixes. Many states and the Kansas Department of Transportation (KDOT) have been using RAP for highway construction. According to the Federal Highway Administration (FHWA), nearly 30 million tons of RAP are recycled into Hot Mix Asphalt (HMA) pavements every year and thus RAP is the most recycled material in the United States.
In 1997, a subgroup of the FHWA Superpave Mixtures Expert Task Group developed interim guidance for the use of RAP based on the past experience. These guidelines established a tiered approach for the RAP usage. The Task Group suggested that up to 15% RAP could be used with no change in binder grade. Between 15% and 25% RAP, the virgin binder grade should be decreased by one increment on both the high and low temperature grades. Above 25% RAP, blending charts should be used to determine how much RAP can be used. Most research has shown that there is no significant difference in Superpave performance when a low RAP content (10%) is used. At a higher RAP content (for example, 40%), however, the difference in the performance becomes significant.
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