United States Department of Transportation
i
Ground penetrating radar study--phase I : technology review and evaluation.
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2006-08-01
[PDF-2.50 MB]
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Alternative Title:Non-contact ground penetrating radar
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Edition:Final report; 2005-2006.
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Abstract:In December 2005 Mississippi Department of Transportation (MDOT) initiated State Study No. 182 on review
and evaluation of ground penetrating radar (GPR) technology. This Phase I study has reviewed GPR equipment
and data interpretation methodologies used for nondestructive determination of pavement layer thickness
values. An extensive literature review was supplemented by review reports from two study consultants, and a
comprehensive GPR technology evaluation survey of GPR manufacturer and users in the United States and
abroad. There is adequate experience available with data interpretation methodologies and FCC certified or
“grandfathered” GPR technologies for reliable and reasonably accurate field assessment of asphalt pavement
layer thicknesses. The MDOT is planning to evaluate this technology together with the nondestructive falling
weight deflectometer (FWD) tests to enhance the evaluation of asphalt highway pavements and rehabilitation
design. A preliminary cost-effectiveness study shows a high benefit/cost ratio of 80-200 based on overlay
thickness design of a 10-mile asphalt pavement section. Based on favorable assessment in this study, a follow
up larger Phase II study is recommended for field evaluation of the candidate GPR technology with 1- GHz and
2-GHz air-launched horn antennas. A ground-coupled 400/500 MHz antenna is also recommended considering
30-inch or thicker pavements and the lime-treated subgrade layer. A pilot field study in Phase II should be
conducted on a test section of a candidate asphalt highway pavement. Upon successful results and validation of
improved pavement evaluation and resulting potential cost savings, the MDOT will consider implementing the
GPR technology for routine use.
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