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Development of Hand-Held Thermographic Inspection Technologies [2009-09]
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2009-09-01
[PDF-14.04 MB]
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OCLC Number:668211707
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Edition:Final report.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:This study explored the application of hand-held thermographic cameras for the detection of subsurface delaminations in concrete bridges. The goal of the research was to provide maintenance and inspection personnel with an effective tool for detecting and monitoring concrete deterioration without disrupting traffic flow. The objectives of the research included developing guidelines for the use and application of the technology by characterizing the environmental conditions (solar loading, diurnal temperature variations, wind speed and relative humidity) necessary for thermography to be effective in the field. A second objective of the research was to investigate the operational constraints to implementation by providing the technology to State participants, to be used for the condition assessment of bridges in the field. A large concrete test block was constructed with embedded targets to model the behavior of subsurface defects (delaminations) at depths ranging from 25 to 127 mm (1 to 5 inches) in concrete. Data was collected for a period of six months and analyzed to determine environmental conditions that would make detection of subsurface delaminations most likely during practical bridge inspections. Quantitative guidance on the appropriate environmental conditions for inspection were developed based on the experimental study. The experiences of the participating states using the thermographic cameras in the field is also reported based on some limited testing.
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