Volume 43, Issue 1 (January 2015)

    In Situ Assessment of Pavement Subgrade Using Falling Weight Deflectometer

    (Received 14 June 2013; accepted 9 January 2014)

    Published Online: 2014

    CODEN: JTEOAD

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    Abstract

    The stiffness modulus and density of pavement subgrade contribute significantly to the long-term performance of a pavement structure. Subgrade functions primarily as a support for road pavement structures. Poor performance of the pavement structure is often a result of a lack of quality control during the construction of the subgrade layer. This paper presents a case study in which a falling weight deflectometer (FWD) test was used to evaluate whether the subgrade layer had achieved the required design stiffness modulus and density during construction. The characteristics of the FWD deflection basins were analyzed and the stiffness modulus was back-calculated using the CIRCLY5 pavement analysis program. The problems associated with FWD testing directly on subgrade are discussed, and an appropriate test load is proposed. Deflection-based models are developed by relating the FWD center deflection with the in situ stiffness modulus and density of the subgrade layer. A dynamic cone penetrometer test was carried out to determine the in situ stiffness modulus, and the results are compared with the back-calculated stiffness from CIRCLY5.


    Author Information:

    Chai, Gary W.
    Centre for Infrastructure Engineering and Management, Griffith Univ., Gold Coast,

    van Staden, Rudi
    Centre for Infrastructure Engineering and Management, Griffith Univ., Gold Coast,

    Loo, Yew-Chaye
    Centre for Infrastructure Engineering and Management, Griffith Univ., Gold Coast,


    Stock #: JTE20130149

    ISSN: 0090-3973

    DOI: 10.1520/JTE20130149

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    Author
    Title In Situ Assessment of Pavement Subgrade Using Falling Weight Deflectometer
    Symposium , 0000-00-00
    Committee A01