United States Department of Transportation
i
Development of Hand-Held Thermographic Inspection Technologies [2009-08]
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2009-08-01
[PDF-10.24 MB]
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Abstract:Subsurface deterioration in concrete structures presents a significant challenge for inspection and maintenance engineers. Cracking, delaminations and spalling that can occur as a result of corrosion of embedded reinforcing steel can lead to pot holes and even punch-through in concrete decks. For overpass bridges, concrete can separate from the structure and fall into traffibelow the bridge, and there have been numerous deadly accidents as a result. Although this deterioration can frequently be detected using hammer sounding and/or chain dragging, these inspection techniques require hands-on access to the surface of theconcrete. For both overpass bridges and decks, lane closures are required to gain access to the structure, and the resulting traffidisruptions makes inspections expensive and logistically difficult. The proposed research would explore the use of hand-held infrared cameras for the remote detection of deterioration in concrete. This technology could reduce the need for lane closures and improve the ability of inspection and maintenance personnel to detect and monitor deterioration in its embryonic stages, such thatmaintenance procedures can be employed before deterioration becomes critical. The technology can also be used to monitor and improve concrete repairs by rapidly identifying the extent of deteroriation and locating its boundaries.
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