United States Department of Transportation
i
Design and analysis procedures for asphalt mixtures containing high RAP contents and/or RAS : [research project capsule].
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2015-07-01
[PDF-145.68 KB]
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Abstract:Asphalt recycling has become an important instrument used to minimize production
costs of new pavements as well as to mitigate its impacts of the environment. Some of
the benefi ts of utilizing recycled materials include the conservation of nonrenewable
natural resources, such as virgin aggregates and asphalt binder; reduction in the amount
of construction debris disposed of in landfi lls; decrease of the variability in material
expenditures; and potential reduction of the overall life-cycle costs. Recycling also
helps to cut greenhouse gas emissions by reducing the energy spent on the extraction
and processing of petroleum products and aggregates. Moreover, the increasing price
of asphalt binder along with more restrictive environmental legislation has forced
the highway agencies and contractors to search for novel materials and construction
techniques. Such eff orts are aimed at fulfi lling the current sustainability needs without
compromising the pavement quality and performance. There is currently considerable
emphasis on the use of reclaimed asphalt pavement (RAP) as preferred recycled
material for highway construction due to its abundance and successful prior experiences.
Recycled asphalt shingles (RAS) have also become another promising recycling
candidate due to their potential use in asphalt mixtures. However, to ensure successful
use of RAP and/or RAS, many concerns relating to the chemical and physical interactions
among virgin and recycled materials as well as the durability of the produced mixture
must be addressed.
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