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Open AccessArticle

Detection of Delamination with Various Width-to-depth Ratios in Concrete Bridge Deck Using Passive IRT: Limits and Applicability

1
Department of Ocean Civil Engineering, Chonnam National University, Yeosu 59626, Korea
2
Department of Civil Engineering, Nha Trang University, Khanh Hoa 57000, Vietnam
3
Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong 53064, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(23), 3996; https://doi.org/10.3390/ma12233996
Received: 28 October 2019 / Revised: 27 November 2019 / Accepted: 29 November 2019 / Published: 2 December 2019
(This article belongs to the Special Issue Non-destructive Testing of Structures)
In bridge structures, concrete decks have a higher risk of damage than other components owing to the direct impact of traffic. This study aims to develop a comprehensive system for bridge inspection using passive infrared thermography (IRT). Experiments were conducted on a concrete specimen (assumed as the surface of the bridge deck) embedded artificial delaminations with different width-to-depth ratios (WTDRs). Both professional handheld IR camera (H-IRC) and a UAV mounted with an IR camera (UAV-IRC) were employed simultaneously to capture the surface temperature of the structure. The present work indicates that the passive IRT technique with an H-IRC can be used to detect delaminations located at depths of 4 cm or less from the structure surface if the WTDRs are not lesser than 1.9 for daytime and 2.5 for nighttime when testing on a sunny day. In addition, the larger the WTDR, the higher the temperature difference can be produced, thus delaminations could be observed more clearly. Furthermore, our study suggests that the concrete bridge deck inspection using passive IRT can produce appropriate results if the inspection is performed from 10:00 to 15:00 or from 19:30 to approximately 2:00 on a sunny day. Good agreement between the results obtained from tests using H-IRC and UAV-IRC was observed, which validates the application of UAV-IRC in real structure inspection. View Full-Text
Keywords: delamination; width-to-depth ratio (WTDR); concrete bridge deck; handheld IR camera (H-IRC); UAV IR camera (UAV-IRC); passive IRT; non-destructive technique; concrete structure delamination; width-to-depth ratio (WTDR); concrete bridge deck; handheld IR camera (H-IRC); UAV IR camera (UAV-IRC); passive IRT; non-destructive technique; concrete structure
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MDPI and ACS Style

Mac, V.H.; Tran, Q.H.; Huh, J.; Doan, N.S.; Kang, C.; Han, D. Detection of Delamination with Various Width-to-depth Ratios in Concrete Bridge Deck Using Passive IRT: Limits and Applicability. Materials 2019, 12, 3996.

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