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    Impact of RAP on the Volumetric, Stiffness, Strength, and Low-Temperature Properties of HMA

    Source: Journal of Materials in Civil Engineering:;2011:;Volume ( 023 ):;issue: 011
    Author:
    Aravind Krishna Swamy
    ,
    Luke F. Mitchell
    ,
    Steven J. Hall
    ,
    Jo Sias Daniel
    DOI: 10.1061/(ASCE)MT.1943-5533.0000245
    Publisher: American Society of Civil Engineers
    Abstract: The increasing cost of virgin asphalt and aggregate has increased the interest in using higher percentages of recycled asphalt pavement (RAP) in hot mix asphalt (HMA) mixtures. The purpose of this research project was to gain a better understanding of how the addition of RAP affects interaction among the aged and virgin binders and the overall properties of HMA. The effects of the addition of RAP were evaluated on a macroscopic scale by comparing the volumetric properties, dynamic modulus, and strength parameters of a series of specimens containing different percentages of RAP from two different sources. Also, the viscoelastic properties of the blended or rejuvenated binder in the recycled mix were back-calculated from the macroscopic properties of the mix using the Hirsch model. Studies have shown that this back-calculation method offers advantages like elimination of the need for extraction of blended binder, the ability to use indirect tension test specimens, and the use of a mechanistic based approach. The back-calculated viscoelastic properties were subsequently used to determine the low-temperature performance grade of the binder in the recycled mix. This research project showed that the percentage of RAP affects the properties of the mixture with respect to mixture volumetrics, dynamic modulus, and strength.
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      Impact of RAP on the Volumetric, Stiffness, Strength, and Low-Temperature Properties of HMA

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    contributor authorAravind Krishna Swamy
    contributor authorLuke F. Mitchell
    contributor authorSteven J. Hall
    contributor authorJo Sias Daniel
    date accessioned2017-05-08T21:55:26Z
    date available2017-05-08T21:55:26Z
    date copyrightNovember 2011
    date issued2011
    identifier other%28asce%29mt%2E1943-5533%2E0000277.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/66599
    description abstractThe increasing cost of virgin asphalt and aggregate has increased the interest in using higher percentages of recycled asphalt pavement (RAP) in hot mix asphalt (HMA) mixtures. The purpose of this research project was to gain a better understanding of how the addition of RAP affects interaction among the aged and virgin binders and the overall properties of HMA. The effects of the addition of RAP were evaluated on a macroscopic scale by comparing the volumetric properties, dynamic modulus, and strength parameters of a series of specimens containing different percentages of RAP from two different sources. Also, the viscoelastic properties of the blended or rejuvenated binder in the recycled mix were back-calculated from the macroscopic properties of the mix using the Hirsch model. Studies have shown that this back-calculation method offers advantages like elimination of the need for extraction of blended binder, the ability to use indirect tension test specimens, and the use of a mechanistic based approach. The back-calculated viscoelastic properties were subsequently used to determine the low-temperature performance grade of the binder in the recycled mix. This research project showed that the percentage of RAP affects the properties of the mixture with respect to mixture volumetrics, dynamic modulus, and strength.
    publisherAmerican Society of Civil Engineers
    titleImpact of RAP on the Volumetric, Stiffness, Strength, and Low-Temperature Properties of HMA
    typeJournal Paper
    journal volume23
    journal issue11
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0000245
    treeJournal of Materials in Civil Engineering:;2011:;Volume ( 023 ):;issue: 011
    contenttypeFulltext
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