Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 3, Number 3, September 2016, pages 277-296
DOI: http://dx.doi.org/10.12989/smm.2016.3.3.277
 
Monitoring concrete bridge decks using infrared thermography with high speed vehicles
Shuhei Hiasa, F. Necati Catbas, Masato Matsumoto and Koji Mitani

 
Abstract     [Full Text]
    There is a need for rapid and objective assessment of concrete bridge decks for maintenance decision making. Infrared Thermography (IRT) has great potential to identify deck delaminations more objectively than routine visual inspections or chain drag tests. In addition, it is possible to collect reliable data rapidly with appropriate IRT cameras attached to vehicles and the data are analyzed effectively. This research compares three infrared cameras with different specifications at different times and speeds for data collection, and explores several factors affecting the utilization of IRT in regards to subsurface damage detection in concrete structures, specifically when the IRT is utilized for high-speed bridge deck inspection at normal driving speeds. These results show that IRT can detect up to 2.54 cm delamination from the concrete surface at any time period. It is observed that nighttime would be the most suitable time frame with less false detections and interferences from the sunlight and less adverse effect due to direct sunlight, making more \"noise\" for the IRT results. This study also revealed two important factors of camera specifications for high-speed inspection by IRT as shorter integration time and higher pixel resolution.
 
Key Words
    infrared thermography; monitoring; non-destructive evaluation; high-speed inspection; bridge deck; delamination; IR camera specifications; cooled IR camera; integration time; pixel resolution
 
Address
Shuhei Hiasa: Department of Civil Environmental and Construction Engineering, University of Central Florida, 12800 Pegasus Drive, Suite 211, Orlando, Florida 32816, USA;
West Nippon Expressway Company Limited (NEXCO-West), Dojima Avanza 19F, 1-6-20 Dojima, Kita-ku, Osaka, 530-0003, Japan
F. Necati Catbas: Department of Civil Environmental and Construction Engineering, University of Central Florida, 12800 Pegasus Drive, Suite 211, Orlando, Florida 32816, USA
Masato Matsumoto and Koji Mitani: NEXCO-West USA Inc. 8300, Boone Blvd., Suite 240, Vienna, Virginia, 22182, USA

 

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