A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on the detectability of buried defects in concrete structures by using transient infrared thermography for health monitoring
Endurance and safety of concrete structures has recently received a great deal of attention in Japan, as a result of accidents related to falling concrete blocks in railroad tunnels and from highway girders. Sudden forces, such as those generated in an earthquake, or steady state vibrations due to passing of vehicles, may trigger such incidents. However, in either case, air gaps caused by dislodging the reinforcing steel rod accelerate the progression towards catastrophic failure. Aggressive health monitoring to detect hidden defects in concrete structures is essential in order to prevent additional incidents. Conventional inspection techniques, such as ultrasonics and acoustics, have provided only a limited solution to the problem. Infrared thermography has been recently recognized to be a potentially effective NDT methodology for concrete inspection. Infrared thermography is a non-contact technique based on remote sensing of radiation energy from concrete surface, allowing the visualization of concrete surface temperature as two-dimensional thermograms. Since each image covers a relatively large area compared to point scanning ultrasonic or acoustic techniques, thermography provides a fast and practical solution for concrete inspection. This research is devoted to the analysis of the limits of detectability of air defects in mortar using thermography with both external lamp (long pulse) and flash heating, and monitoring temperature distributions on the mortar surface by means of different infrared cameras.
Study on the detectability of buried defects in concrete structures by using transient infrared thermography for health monitoring
Endurance and safety of concrete structures has recently received a great deal of attention in Japan, as a result of accidents related to falling concrete blocks in railroad tunnels and from highway girders. Sudden forces, such as those generated in an earthquake, or steady state vibrations due to passing of vehicles, may trigger such incidents. However, in either case, air gaps caused by dislodging the reinforcing steel rod accelerate the progression towards catastrophic failure. Aggressive health monitoring to detect hidden defects in concrete structures is essential in order to prevent additional incidents. Conventional inspection techniques, such as ultrasonics and acoustics, have provided only a limited solution to the problem. Infrared thermography has been recently recognized to be a potentially effective NDT methodology for concrete inspection. Infrared thermography is a non-contact technique based on remote sensing of radiation energy from concrete surface, allowing the visualization of concrete surface temperature as two-dimensional thermograms. Since each image covers a relatively large area compared to point scanning ultrasonic or acoustic techniques, thermography provides a fast and practical solution for concrete inspection. This research is devoted to the analysis of the limits of detectability of air defects in mortar using thermography with both external lamp (long pulse) and flash heating, and monitoring temperature distributions on the mortar surface by means of different infrared cameras.
Study on the detectability of buried defects in concrete structures by using transient infrared thermography for health monitoring
Untersuchung der Nachweisbarkeit versteckter Fehler in Betonstrukturen mittels transienter Infrarotthermographie zur Zustandsüberwachung
Kamoi, A. (author) / Yamada, M. (author) / Okamoto, Y. (author) / Shepard, S.M. (author)
2004
6 Seiten, 11 Bilder, 1 Tabelle, 7 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
Study on Detection Limit of Buried Defects in Concrete Structures by Using Infrared Thermography
| British Library Online Contents | 2004