High speed ground-coupled GPR for road and bridge inspection

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High speed ground-coupled GPR for road and bridge inspection

Annan, A.P. / Redman, J.D.

Ground penetrating radar (GPR) has been used for examination of roads and bridges with considerable success. The majority of work requires data acquisition at highway speeds to minimize traffic management cost. To date, high speed GPR surveys have primarily used air-launched antenna systems mounted well above the road surface to allow for high speed profiling without incurring damage to the antennas. Sensors & Software Inc. recently introduced the RoadMap ground-coupled GPR system. RoadMap was designed and developed to be a highway speed ground-coupled system that achieves higher spatial resolution and deeper penetration. RoadMap systems now deliver results not previously observed with high speed road surveys. Use of multiple high and low frequency transducers makes for great operational versatility. Further, the use of ground-coupled GPR overcomes many of the new regulatory issues associated with air-launched GPR. We present results of recent surveys that illustrate how the RoadMap system addresses such diverse applications as pavement thickness estimation, detection of buried utilities, mapping repairs, joint deterioration in concrete pavement, rebar depth, concrete degradation and many others. RoadMap acquires data with synchronized GPS coordinates and digital photography making transfer of data into engineering reports fast and cost effective. Data from RoadMap is readily imported into GIS and similar mapping systems and databases.