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Effective implementation of ground penetrating radar (GPR) for condition assessment & monitoring of critical infrastructure components of bridges and highways.
  • Published Date:
    2015-01-01
  • Language:
    English
Filetype[PDF-9.74 MB]


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Effective implementation of ground penetrating radar (GPR) for condition assessment & monitoring of critical infrastructure components of bridges and highways.
Details:
  • Publication/ Report Number:
    MD-15-SHA-UM-3-11
  • Resource Type:
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  • Format:
  • Abstract:
    Recently Maryland State Highway Administration (SHA) started to explore use of Ground Penetrating Radar

    (GPR) technology to provide quantitative information for improved decision making and reduced operating

    costs. To take full advantage of the GPR capabilities, improved analysis techniques need to be developed and

    implemented. The objective of this study was to assist SHA engineers, technicians, and decision makers in

    their current effort to explore the use of GPR in assessing the condition of critical infrastructure components

    and to identify potential improvements in GPR data analysis. The research team closely interacted with

    representatives from selected divisions of the Office of Materials Technology (OMT) to identify potential

    GPR applications using existing equipment accessible to SHA, targeting critical high priority areas for

    analysis and improvement. In regards to pavement structures, a new methodology was suggested to improve

    the accuracy of GPR data analysis. The initial analysis and results indicated that Multi-scale Pavement GPR

    data Analysis (MPGA) has significant potential to add value and accuracy to pavement thickness data used in

    pavement management and rehabilitation analysis. The MPGA results indicate that pavement thickness data

    trends can be identified based on either automated or semi-automated procedures based on target variability

    levels of thickness uniformity, and thus can be used to efficiently evaluate pavement material layers.

    Similarly, for bridge deck analysis, techniques such as migration imaging (for concrete cover depth

    measurement applications among others) and Fourier analysis of GPR waveforms (for qualitative bridge deck

    moisture analysis) were used in addition to emerging techniques such as Short Time Fourier Transform

    analysis (for anticipated quantitative moisture analysis) for improving GPR data interpretation. Migration and

    Fourier techniques were illustrated corresponding to GPR data collected using a GPR array on selected bridge

    decks in the Salisbury, MD area. When applied appropriately, such techniques can provide more reliable

    analysis of bridge deck inspection than conventional means. In terms of precast concrete, this study has shown

    how GPR can be used to address several of the inspections needed in precast concrete production, including

    an evaluation of concrete cover depth, reinforcement location, and section thicknesses. The testing and

    demonstration showed significant potential for quality control using GPR.

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