Ground Penetration Radar (GPR) is a powerful,
reliable and high performance non destructive testing tool for solving various
kinds of engineering problems related to geotechnical site investigation,
construction, and maintenance of highways and bridges. It has been increasingly
utilized for the management of highway infrastructures such as road pavements
and bridges on a network level which requires condition assessment and
deterioration modeling. GPR can determine the layer thickness and estimate
moisture content of the in-situ soil underlying the pavement. It has a
promising future because of its efficiency, quality, and non-destructiveness.
GPR provides reliable and significant information to pavement condition
evaluation that is very useful to predict the pavement’s structural capacity
and performance. This will further help improve pavement maintenance and
rehabilitation strategies, and in the long term, it provides rationalities in
allocating funds. GPR in combination with other nondestructive evaluation
methods such as Falling Wheel Deflectometer (FWD) or Rolling Wheel
Deflectometer (RWD) can provide complete data for pavement layer thickness,
deflection and elastic moduli for the mechanistic pavement performance
prediction model. However, the application of GPR in highway engineering is
limited because of our incomplete understanding of the dielectric properties of
highway materials.
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Figure: Ground Pentration Radar (Sonyok and Zhang 2008)
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