Sub-surface simulated damage detection using Non-Destructive Testing Techniques in reinforced-concrete slabs

Rathod, Harsh; Gupta, Rishi

doi:10.1016/j.conbuildmat.2019.04.223

Cited by 30 publications

(13 citation statements)

References 19 publications

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“…is experiment is an evolution of the traditional model test [1], which enables the consideration of the steel shell structure, size, concrete casting, and other factors. According to the actual construction conditions, construction process, and construction methods of a sandwich-structured immersed tunnel (SSIT) [2][3][4], fullscale test was conducted to study the void defects that may occur during the actual production and construction [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Void Defect Detection in Sandwich-Structured Immersed Tunnel Using Elastic Wave

Liu

Zhang

et al. 2021

Shock and Vibration

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Void defects can be easily generated between a steel plate and concrete joint due to the complicated internal structure of a sandwich-structured immersed tunnel (SSIT), which affect the overall bearing capacity of the main structure of the immersed tube tunnel. A prototype experiment was conducted to study the application of impact imaging method in the nondestructive detection of void defects in SSITs. The detection criterion for the impact imaging method was established based on the features of the waveform data. Nevertheless, the influence of steel plate thickness, material properties, void location, and structure on the detection accuracy of the impact imaging method is unclear. Therefore, numerical simulation was applied to study the influencing factors by establishing a different condition model. Good agreement between the experimental and numerical results was observed for the response waveform collected from the inspection area. Using the calculation model and identified material parameters validated in the active prototype experiment, numerical simulations of several sets, which considered all influencing factors, were performed. The application scope and sensitivity of the impact image method were recommended to reduce misjudgement in practical applications and improve detection accuracy.

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Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Void Defect Detection in Sandwich-Structured Immersed Tunnel Using Elastic Wave

Liu

Zhang

et al. 2021

Shock and Vibration

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“…To address this problem, several non‐destructive techniques have been developed and applied in engineering practice. For example, visual inspection along with hammer sounding and coin tapping, chain dragging, impact echo, electric resistivity, ultrasonic surface wave, ground penetration radar, and infrared thermography (IRT)/thermal imaging have been previously used for structural health monitoring of bridges 17–22 . IRT has the advantage of quickly scanning the 2D surface using an infrared camera, without affecting the bridge operation 23 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, visual inspection along with hammer sounding and coin tapping, chain dragging, impact echo, electric resistivity, ultrasonic surface wave, ground penetration radar, and infrared thermography (IRT)/thermal imaging have been previously used for structural health monitoring of bridges. [17][18][19][20][21][22] IRT has the advantage of quickly scanning the 2D surface using an infrared camera, without affecting the bridge operation. 23 In addition, the remote scanning capability of IRT allows the inspection of bridge girders and lower surface of the bridge deck which are difficult to access during inspection.…”

mentioning

confidence: 99%

Infrared thermography detection of delamination in bottom of concrete bridge decks

Raja

Miramini

Duffield

et al. 2021

Structural Contr & Hlth

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Infrared thermography (IRT) has been widely used in detecting the subsurface delamination of bridge deck. However, IRT inspection on delamination zones of the bridge deck which have limited exposure to direct solar radiation (e.g., the bottom surface of the bridge deck) is rather challenging due to the relatively low thermal contrast (ΔT) development in these zones. Therefore, the purpose of this study is to conduct a series of experimental studies in conjunction with numerical modeling for investigating the effectiveness of IRT in delamination detection of bridge deck components which are normally not exposed to direct solar radiation. Specially, the effects of different environmental conditions, thickness of bridge deck, and defect characteristics on the absolute thermal contrast (ΔT) development were systematically investigated. The results show that IRT can effectively detect the subsurface delamination of concrete bridge deck located in regions that are not exposed to the direct solar radiation. In addition, the development of detectable thermal contrast (>0.5 C) is much dependent on the rate of change in ambient temperature with a suitable detection period between 8 am and 4 pm. Furthermore, it shows that the value of ΔT increases with the increase of bridge deck thickness and delamination size.

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“…Hence, using the thermal mapper is a promising approach to quickly detect the thermodynamic disfigurement regions in the envelop enclosure, and to analyzing and calculating the impacts of these disfigurements on the heat flux in the greenhouse, and thus guiding the reconstruction and building of solar greenhouse. This technique had been used for detecting the thermodynamic disfigurement of the envelope of building [20,21] , or judging the defects in pipeline insulation structure and their impacts on the heat dissipation of pipes [22,23] . These investigations provide references for grasping the methods evaluating the envelope structure performance of solar greenhouse.…”

Section: Introduction mentioning

confidence: 99%

Influence of thermodynamic disfigurement on the convective heat transfer of solar greenhouse

Sun

Cao

Wang

et al. 2020

International Journal of Agricultural and Biological Engineering

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Solar greenhouse is a typical greenhouse without any additional heating system, which has developed rapidly in Northern China. However, due to the construction quality, management methods, especially the long-term use and other factors, there are usually different degrees of thermodynamic disfigurements in the envelop enclosure of solar greenhouse. The purpose of this study was to investigate the influences of thermodynamic disfigurement on the temperature distribution and convective heat transfer of solar greenhouse. In this study, the east and west compartments of a typical solar greenhouse which is located in Yangling, China (108°4′E, 34°16′N) were tested. The air temperature of each compartment was collected using temperature recorders, and the thermal infrared images of different compartment envelopes were obtained by a thermal infrared imager on a typical cloudy day. Convective heat transfer coefficients and heat flux densities of different compartment envelopes in the solar greenhouse were calculated. The results showed that the temperature difference can be displayed in the thermal infrared images of compartment envelopes, the surface temperature of the front roof was the lowest, followed by the back roof, the wall surface temperature was the highest. The minimum average surface temperature of the front roof in the eastern compartment was only 3.8°C, which was 6.8°C and 9.2°C lower than the average surface temperature of the back roof and back wall, respectively. The surface average temperature of thermodynamic disfigurements located at the bottom of the south side in the front roof of the eastern compartment, whose area accounted for 16.5% of the total front roof in the eastern compartment, was only 5.4°C. Compared with non-thermodynamic disfigurement, the average convective heat transfer coefficient and heat flux density of thermodynamic disfigurements in the front roof of the eastern compartment were increased by 20.3% and 110.3%, respectively. The average air temperature in the eastern compartment was 3.5°C lower than the average air temperature in the western compartment of the solar greenhouse. Construction of brick wall at the bottom of the south side of the front roof in the solar greenhouse helped to increase the inner surface temperature of the front roof, with an average temperature rise of 6.2°C, and reduce the area of thermodynamic disfigurement, which only accounted for 2.6% of the total front roof in the western compartment. The average surface temperature of thermodynamic disfigurements mainly caused by the entry and exit door in the wall of the eastern compartment was only 9.8°C, which was lower 3.2°C than the average temperature of non-thermodynamic disfigurement of the wall. Thermodynamic disfigurement helped to increase heat loss. The weighted average proportion of thermodynamic disfigurement in the western compartment was 2.1%, while that of thermodynamic disfigurement in the eastern compartment was 10.7%. The thermal insulation performance of the western compartment envelope in the s...

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Sub-surface simulated damage detection using Non-Destructive Testing Techniques in reinforced-concrete slabs

Cited by 30 publications

References 19 publications

Simulation Analysis of Void Defect Detection in Sandwich-Structured Immersed Tunnel Using Elastic Wave

Simulation Analysis of Void Defect Detection in Sandwich-Structured Immersed Tunnel Using Elastic Wave

Infrared thermography detection of delamination in bottom of concrete bridge decks

Influence of thermodynamic disfigurement on the convective heat transfer of solar greenhouse

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