Design and analysis procedures for asphalt mixtures containing high RAP contents and/or RAS : [research project capsule].
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Design and analysis procedures for asphalt mixtures containing high RAP contents and/or RAS : [research project capsule].

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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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