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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