Volume 31, Issue 3 (May 2008)

    Detecting Subsurface Voids Using Ground-Coupled Penetrating Radar

    (Received 10 August 2007; accepted 24 November 2007)

    Published Online: 2008

    CODEN: GTJOAD

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    Abstract

    Detecting the presence and extent of subsurface voids under a roadway structure is critical in preventing major failures from occurring. In this study, a 400 MHz Ground-coupled Penetrating Radar (GCPR) was utilized in four projects to locate voids. The air voids present a strong dielectric contrast to GPR waves and therefore these anomalies are clearly identified on GCPR results/plots. In one study, a large void more than 1.8 m in depth was located under the continuous reinforced concrete pavement on IH40 in the Amarillo District of Texas. In total, 3.8 cubic metres of flowable fill was used to fill the void. Voids with depths from 50 to 400 mm were identified and verified in studies on SH6, IH35, and Spur 380. The voids are typically located directly under the surface pavement layer. This study has successfully demonstrated that the GCPR is able to identify void locations. However, drilling and coring should also be done to determine the extent and depth of the void.


    Author Information:

    Chen, Dar Hao
    ProfessorPavement Engineering Supervisor, Changsha University of Science and Technology, School of Highway EngineeringTexas Department of Transportation, Changsha, HunanAustin, TX

    Scullion, Tom
    Program Manager, Texas Transportation Institute, 501 CE/TTI Building, Texas A&M University, College Station, TX


    Stock #: GTJ101397

    ISSN: 0149-6115

    DOI: 10.1520/GTJ101397

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    Author
    Title Detecting Subsurface Voids Using Ground-Coupled Penetrating Radar
    Symposium , 0000-00-00
    Committee D18