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Air Rail Highway Bike/Ped Public Transit
Bridge Deck Evaluations using High Speed Ground Penetrating Radar (GPR)
Project ID: 91-5
Researcher: Infrasense, Inc.
Status: Completed (Note: this research was conducted in the early 1990’s and is included on this Web site because of its value to subsequent research on GPR.)

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The DECAR system (DEck Condition Assessment using Radar) to survey asphalt- overlaid bridge decks at highway speed was developed, implemented, and tested. Three network surveys representing 44 bridge decks were carried out along Interstates 89 and 93 in New Hampshire. It was shown that groups of bridge decks could be successively surveyed at highway speed during a continuous round trip over the survey route, and that production rates of 10 to 20 decks per day could easily be achieved. Of the 44 decks surveyed, 19 were evaluated during replacement or repair to determine actual deck condition. The radar deterioration predictions (% deteriorated area) were compared to the actual conditions with a correlation (R2) of 0.81 and a standard error of 4.4% of the total deck area. When radar data were used to classify the decks into one of four categories, the radar results were accurate 93% of the time.


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New Hampshire Department of Transportation
PO Box 483 | 7 Hazen Drive | Concord, NH | 03302-0483
Tel: 603.271-3734 | Fax: 603.271.3914

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