Volume 9, Issue 2 (February 2012)

    Influence of Recovery Processes on Properties of Binders and Aggregates Recovered from Recycled Asphalt Pavement

    (Received 7 December 2010; accepted 30 August 2011)

    Published Online: 2011

    CODEN: JAIOAD

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    Abstract

    Usage of recycled asphalt pavement (RAP) in the construction of new pavements has increased in recent years due to the movement to conserve energy and raw materials, and reuse waste materials. To assess the effectiveness of RAP materials in new asphalt mixes, it is important to evaluate the properties of the recovered binders and aggregates. The widely used “Abson” method is employed in this study to recover asphalt binder from RAP. Also, the frequently used “NCAT ignition” method is used to extract aggregates. A laboratory study comprising two field RAP materials, two simulated RAP materials, and corresponding virgin materials was undertaken to assess possible influences of the aforementioned recovery processes. The performance grade (PG) of the recovered binders, and gradation, durability (LAAbrasion and Micro-Deval), specific gravity, sand equivalent, and insoluble residue of the extracted aggregates were evaluated as per the AASHTO and Oklahoma Dept. of Transportation (ODOT) standards. The test results showed that the Abson method notably influenced the critical PG temperatures of the recovered binder. It was also observed that some mechanical properties (durability and sand equivalent) of RAP aggregates were inconsistent with their virgin counterparts. Furthermore, field RAP aggregates showed significant variations in LA Abrasion loss and insoluble residue test results. The findings of this study are expected to be helpful in the evaluation of RAP for reuse in asphalt paving.


    Author Information:

    Hossain, Zahid
    The Univ. of Oklahoma,

    Solanki, Pranshoo
    The Univ. of Oklahoma,

    Zaman, Musharraf
    School of Civil Engineering and Environmental Science, College of Engineering,

    Lewis, Sharon
    Assistant Professor, Dept. of Chemistry, Langston Univ.,

    Hobson, Kenneth
    Bituminous Engineer, Materials Division, OK Dept. of Transportation,


    Stock #: JAI103679

    ISSN: 1546-962X

    DOI: 10.1520/JAI103679

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    Author
    Title Influence of Recovery Processes on Properties of Binders and Aggregates Recovered from Recycled Asphalt Pavement
    Symposium , 0000-00-00
    Committee D04