Effects of rebars on the detectability of subsurface defects in concrete bridges using square pulse thermography

Tran, Quang Huy; Huh, Jungwon; Mac, Van Ha; Kang, Changwoo; Han, Derick

doi:10.1016/j.ndteint.2018.09.001

Cited by 29 publications

(28 citation statements)

References 5 publications

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“…In active IRT, four traditional contrast definitions, including absolute, running, normalized, and standard contrasts, are commonly employed to quantitatively evaluate the defect detection on thermal images [12][13][14]18,[34][35][36][37][38][39][40]. In addition, another contrast method called differential absolute contrast (DAC) was proposed and applied successfully to investigate the structural health [41,42].…”

Section: Thermal Contrast and Signal-to-noise Computationmentioning

confidence: 99%

“…Among the methods described above, the running and normalized contrasts are applied to reduce the disadvantages of the absolute and standard contrasts in which the effects of a non-uniform surface and emissivity can be reduced [18,36,[43][44][45]. The drawback of the normalized contrast is that the time instant of maximum excess temperature must be determined first [18].…”

Section: Thermal Contrast and Signal-to-noise Computationmentioning

confidence: 99%

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Thermography-Based Deterioration Detection in Concrete Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer

Mac

Huh

Doan

et al. 2020

Sensors

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In bridge structures worldwide, carbon fiber-reinforced polymer (CFRP) sheets are applied to strengthen weak components, especially concrete girders that are at a high risk of rapid degradation during the bridge’s operation owing to impacts from the superstructure’s weight and traffic loads. Regarding the thermography-based method (TM), although deteriorations in the concrete core are some of the main defects in concrete structures strengthened with CFRP, these do not receive as much attention as damage in the CFRP. Therefore, the interpretation of the structural health in terms of these defects using TM is still unclear. The problem presented in this work addresses the quantification of delamination inside the concrete part of a specimen with a CFRP sheet installed on the surface (assumed to be the girder surface strengthened with CFRP) via step heating thermography. Additionally, the empirical thermal diffusivity of concrete girders strengthened with a CFRP sheet (CSC girder), has not been provided previously, is proposed in the present study to predict delamination depths used for field investigations. Moreover, the effect of the CFRP sheet installed on the structure’s surface on the absolute contrast of delamination is clarified. Finally, advanced post-processing algorithms, i.e., thermal signal reconstruction and pulsed phase thermography, are applied to images obtained with step heating thermography to enhance the visibility of delamination in CSC girders.

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Section: Thermal Contrast and Signal-to-noise Computationmentioning

confidence: 99%

Section: Thermal Contrast and Signal-to-noise Computationmentioning

confidence: 99%

Thermography-Based Deterioration Detection in Concrete Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer

Mac

Huh

Doan

et al. 2020

Sensors

Self Cite

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“…For example, Montinaro et al [47] detected the debonding defects between aerospace grade fiber metal laminate layers by analyzing the characteristics of the thermal image obtained by the nondestructive infrared testing device. QH Tran et al [48] used a square pulse thermal imager to analyze various heating and environmental conditions for concrete samples, aiming to comprehensively study the effect of steel on stratification detection capability when the width to depth ratio of the layer is equal to or less than 2.0.…”

Section: Keyword Timeline Viewmentioning

confidence: 99%

Visualizing the Knowledge Structure and Research Evolution of Infrared Detection Technology Studies

et al. 2019

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This paper aims to explore the current status, research trends and hotspots related to the field of infrared detection technology through bibliometric analysis and visualization techniques based on the Science Citation Index Expanded (SCIE) and Social Sciences Citation Index (SSCI) articles published between 1990 and 2018 using the VOSviewer and Citespace software tools. Based on our analysis, we first present the spatiotemporal distribution of the literature related to infrared detection technology, including annual publications, origin country/region, main research organization, and source publications. Then, we report the main subject categories involved in infrared detection technology. Furthermore, we adopt literature cocitation, author cocitation, keyword co-occurrence and timeline visualization analyses to visually explore the research fronts and trends, and present the evolution of infrared detection technology research. The results show that China, the USA and Italy are the three most active countries in infrared detection technology research and that the Centre National de la Recherche Scientifique has the largest number of publications among related organizations. The most prominent research hotspots in the past five years are vibration thermal imaging, pulse thermal imaging, photonic crystals, skin temperature, remote sensing technology, and detection of delamination defects in concrete. The trend of future research on infrared detection technology is from qualitative to quantitative research development, engineering application research and infrared detection technology combined with other detection techniques. The proposed approach based on the scientific knowledge graph analysis can be used to establish reference information and a research basis for application and development of methods in the domain of infrared detection technology studies.

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“…The IR camera will automatically calculate the atmosphere transmission and the surface temperature of the specimen [30]. It is noted that a small amount of data of this study can be found in our previous research work [5].…”

Section: Testing Processmentioning

confidence: 99%

Detectability of Delamination in Concrete Structure Using Active Infrared Thermography in Terms of Signal-to-Noise Ratio

et al. 2018

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Detecting subsurface delamination is a difficult and vital task to maintain the durability and serviceability of concrete structure for its whole life cycle. The aim of this work was to obtain better knowledge of the effect of depth, heating time, and rebar on the detectability capacity of delamination. Experimental tests were carried out on a concrete specimen in the laboratory using Long Pulsed Thermography (LPT). Six halogen lamps and a long wavelength infrared camera with a focal plane array of 640 × 480 pixels were used as the heat source and infrared detector, respectively. The study focused on the embedded imitation delaminations with the size of 10 cm × 10 cm × 1 cm, located at depths varying from 1 to 8 cm. The signal-to-noise ratio (SNR) was applied as a criterion to assess the detectability of delamination. The results of this study indicate that as the provided heating time climbed, the SNR increased, and the defect could be identified more clearly. On the other hand, when using the same heating regime, a shallow delamination displayed a higher SNR than a deeper one. The moderate fall of the SNR in the case of imitating defect located below reinforced steel was also observed. The absolute contrast was monitored to determine the observation time, and the nondimensional prefactor k was empirically proposed to predict the depth of delamination. The mean absolute percentage error (MAPE) was used to quantitatively evaluate the difference between forecasted and real depth, which evaluation confirmed the high reliability of the estimated value of the prefactor k.

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Effects of rebars on the detectability of subsurface defects in concrete bridges using square pulse thermography

Cited by 29 publications

References 5 publications

Thermography-Based Deterioration Detection in Concrete Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer

Thermography-Based Deterioration Detection in Concrete Bridge Girders Strengthened with Carbon Fiber-Reinforced Polymer

Visualizing the Knowledge Structure and Research Evolution of Infrared Detection Technology Studies

Detectability of Delamination in Concrete Structure Using Active Infrared Thermography in Terms of Signal-to-Noise Ratio

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