Non-Destructive Inspection of Multiple Concrete Cracks Using Ultrasonic Sensor

Islam, Muhammed Mazharul; Yamamoto, Hiroshi; Tanaka, Shogo

doi:10.1109/sice.2006.314679

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…The method uses the pattern matching technique to detect the optimum match between the measured and predicted ultrasonic signals of the reflected waves from the deteriorated concrete specimens, and thus determined the damage depth [25]. In this study the following objective function is maximized [38]:…”

Section: Verification Of Ultrasonic Measurement Results Using Phenolpmentioning

confidence: 99%

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Ultrasonic measurements of undamaged concrete layer thickness in a deteriorated concrete structure

Demčenko

Visser

Akkerman

2016

NDT & E International

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Section: Verification Of Ultrasonic Measurement Results Using Phenolpmentioning

confidence: 99%

“…Pulse-echo and diffuse field measurements are performed at a center frequency of 0.5 MHz on concrete specimens. The pulse-echo measurement results from the test specimens are verified by the standard phenolphthalein tests [24] and pattern matching technique [25].…”

Section: Introductionmentioning

confidence: 96%

Ultrasonic measurements of undamaged concrete layer thickness in a deteriorated concrete structure

Demčenko

Visser

Akkerman

2016

NDT & E International

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“…ACI 224R-01 recommends a maximum allowable crack width of 0.18 mm for concrete exposed to de-icing chemicals 55 . Meanwhile, non-destructive testing (NDT) of concrete cracks is normally used for the maintenance of these concrete structures, and numerous methods are changing with the development of detection devices 56 . However, Titman emphasized the need for care and experience despite the advantages of the NDT methods, and indicated that inaccurate interpretation can be made in the absence of a specialized technique 57 .…”

Section: Resultsmentioning

confidence: 99%

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Choi

Chin

Yuan

et al. 2022

Sci Rep

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A bridge bearing anchor transmits various loads of a superstructure to a substructure. Most anchors are generally designed without consideration of characteristics such as concrete pedestal, grout bedding, and anchor socket. This study investigated the shear behavior of anchors in accordance with the edge distance, embedment depth, compressive strength of concrete, and height of the concrete pedestal in order to simulate the practical characteristics of the bridge bearing anchors. The actual shear capacity of the anchor differs from the shear strengths calculated by the ACI 318 and EN 1992-4; especially, the importance of the embedment depth is underestimated in these codes. An increase in the height of the concrete pedestal has a negative effect on the shear capacity because of the stress concentration. The grout is fractured prior to the occurrence of local damages in concrete, resulting in a secondary moment. As a result, the effect of the level arm is observed. An equation, which can predict the relative cracking degree of concrete, is proposed by analyzing the displacement of grout and concrete. High strain occurs in the stirrups close to the anchor, and the behavior of the strain is more influenced by the embedment depth than the edge distance. The comparison of obtained and analytically evaluated failure loads by calculations according to EN 1992-4, Schmid model and Sharma model was conducted to consider the effect of supplementary reinforcement. Finally, the design equation of concrete breakout strength is modified to predict the more precise shear resistance of a bridge bearing anchor.

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“…ACI 224R-01 recommends a maximum allowable crack width of 0.18 mm for concrete exposed to de-icing chemicals [49]. Meanwhile, non-destructive testing (NDT) of concrete cracks is normally used for the maintenance of these concrete structures, and numerous methods are changing with the development of detection devices [50]. However, Titman emphasized the need for care and experience despite the advantages of the NDT methods, and indicated that inaccurate interpretation can be made in the absence of a specialized technique [51].…”

Section: Displacement Behavior Of Grout Bedding and Concrete Pedestalmentioning

confidence: 99%

Shear Behavior of Single Cast-in Anchor Simulating Characteristics of Bridge Bearing Anchor

Choi¹,

Chin

Yuan³

et al. 2021

Preprint

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A bridge bearing anchor transmits various loads of a superstructure to a substructure. However, most anchors are generally designed without consideration of characteristics such as concrete pedestal, grout bedding, and anchor socket. Therefore, this study investigated the shear behavior of anchors in accordance with the edge distance, embedment depth, compressive strength of concrete, and height of the concrete pedestal in order to simulate the practical characteristics of the bridge bearing anchors. The actual shear capacity of the anchor differs from the shear strength calculated by the ACI 318 Code; especially, the importance of the embedment depth is underestimated in the code. An increase in the height of the concrete pedestal has a negative effect on the shear capacity because of the stress concentration. The grout is fractured prior to the occurrence of local damages in concrete, resulting in a secondary moment. As a result, the effect of the level arm is observed. An equation, which can predict the relative cracking degree of concrete, is proposed by analyzing the displacement of grout and concrete. High strain occurs in the stirrups close to the anchor, and the behavior of the strain is more influenced by the embedment depth than the edge distance. Finally, the design equation of concrete breakout strength is modified to predict the more precise shear resistance of a bridge bearing anchor.

show abstract

Non-Destructive Inspection of Multiple Concrete Cracks Using Ultrasonic Sensor

Cited by 5 publications

References 5 publications

Ultrasonic measurements of undamaged concrete layer thickness in a deteriorated concrete structure

Ultrasonic measurements of undamaged concrete layer thickness in a deteriorated concrete structure

Shear behavior of single cast-in anchor simulating characteristics of bridge bearing anchor

Shear Behavior of Single Cast-in Anchor Simulating Characteristics of Bridge Bearing Anchor

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