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    Volume 50, Issue 2 (August 2021)

    Special Issue Paper

    Study of the Influence of the Mastic Coating of Untreated Reclaimed Asphalt Pavement on the Permanent and Resilient Behavior

    (Received 25 March 2021; accepted 7 June 2021)

    Published Online: 10 August 2021

    CODEN: JTEVAB

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    Abstract

    Reclaimed asphalt pavement (RAP) arises from the demolition of asphalt road layers. The Optimal Recycling of Reclaimed Asphalt Pavements Project concerns the cold recycling of 100 % RAP without binder addition in base and subbase layers of low-traffic roads. In this context, a test program was performed with Rhine region materials to evaluate the impact of the mastic coating of untreated RAP. A source of reclaimed asphalts with 4.4 % of bitumen is tested before (RAP) and after binder extraction (RAP-BE) and then is compared to an unbound granular material (UGM) with a similar particle-size distribution. Repeated load triaxial tests were conducted at several frequencies to study the permanent and resilient behaviors. The results show that the RAP before binder extraction and the UGM present similar permanent behaviors, while the aggregates without binder reveal low strains. Concerning the resilient phase, the RAP and the RAP-BE show similar levels of strains, but the resilient moduli of the UGM are significantly lower than those of the RAP. From the experimental results, the nonlinear elastic Boyce model was fitted and brings out a highly anisotropic mechanical behavior of the RAP. Finally, the RAP shows a frequency-sensitive viscous behavior because of the bitumen in the mastic, while the effect of the frequency is negligible for the RAP-BE.

    Author Information:

    Gaillard, Laura
    ICUBE, UMR 7357, CNRS, INSA Strasbourg, Strasbourg University, Strasbourg,

    Chazallon, Cyrille
    ICUBE, UMR 7357, CNRS, INSA Strasbourg, Strasbourg University, Strasbourg,

    Hornych, Pierre
    MAST-LAMES, Gustave Eiffel University, IFSTTAR, Bouguenais,

    Quezada, Juan Carlos
    ICUBE, UMR 7357, CNRS, INSA Strasbourg, Strasbourg University, Strasbourg,

    Geffard, Jean-Luc
    MAST-LAMES, Gustave Eiffel University, IFSTTAR, Bouguenais,


    Stock #: JTE20210200

    ISSN:0090-3973

    DOI: 10.1520/JTE20210200

    Author
    Title Study of the Influence of the Mastic Coating of Untreated Reclaimed Asphalt Pavement on the Permanent and Resilient Behavior
    Symposium ,
    Committee D04