Laboratory-based Unified Permanent Deformation Model for Hot-Mix Asphalt Mixtures

    Volume 35, Issue 3 (May 2007)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 10 November 2006

    Page Count: 9


    Hajj, Elie Y.
    Ph.D., Professor, and Professor and Director, Pavements/Materials Program, Department of Civil Engineering, University of Nevada, Reno, NV

    Siddharthan, Raj V.
    Ph.D., Professor, and Professor and Director, Pavements/Materials Program, Department of Civil Engineering, University of Nevada, Reno, NV

    Sebaaly, Peter E.
    Ph.D., Professor, and Professor and Director, Pavements/Materials Program, Department of Civil Engineering, University of Nevada, Reno, NV

    Weitzel, Dean
    Chief Materials Engineer, Materials Division, Nevada Department of Transportation, Carson City, NV

    (Received 30 November 2004; accepted 18 October 2006)

    Abstract

    Conventionally, the resistance of hot-mixed asphalt (HMA) mixtures to permanent deformation is measured by repeated load triaxial (RLT) or repeated shear at constant height (RSCH) testing. The data from these tests have been treated as independent datasets in the prediction of rutting potential in HMA layers. This paper presents a unified permanent deformation model using response measurements made from both tests. The new model quantifies the accumulated permanent shear strain as a function of number of load cycles and factor of safety (FOS). The factor of safety is defined in the q-p space and is evaluated based on the applied stresses and triaxial compression strength properties (cohesion and angle of internal friction). For the specific mixture used in this study, a good correlation was found between the cumulative permanent shear strain and the FOS level, irrespective of the stress conditions and the type of test used.


    Paper ID: JTE13153

    DOI: 10.1520/JTE13153

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    Author
    Title Laboratory-based Unified Permanent Deformation Model for Hot-Mix Asphalt Mixtures
    Symposium , 0000-00-00
    Committee D04