Air-Coupled Surface Wave Transmission Measurement Across a Partially Closed Surface-Breaking Crack in Concrete

Kee, Seong‐Hoon; Zhu, Jinying

doi:10.1063/1.3591853

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…A dial gauge was installed on the top concrete surface to measure variation of the crack width (crack-mouth-opening-displacement: CMOD) during the test (see figure 4(b)). The specifics of the testing procedure can be found in another publication by the author [11].…”

Section: Testing Proceduresmentioning

confidence: 99%

Using piezoelectric sensors for ultrasonic pulse velocity measurements in concrete

Kee

Zhu

2013

Smart Mater. Struct.

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The ultrasonic pulse velocity (UPV) test has been a widely used non-destructive testing method for concrete structures. However, the conventional UPV test has limitations in consistency of results and applicability in hard-to-access regions of structures. The authors explore the feasibility of embedded piezoelectric (PZT) sensors for ultrasonic measurements in concrete structures. Two PZT sensors were embedded in a reinforced concrete specimen. One sensor worked as an actuator driven by an ultrasonic pulse-receiver, and another sensor worked as a receiver. A series of ultrasonic tests were conducted to investigate the performance of the embedded sensors in crack-free concrete and concrete specimens having a surface-breaking crack under various external loadings. Signals measured by the embedded sensors show a broad bandwidth with a centre frequency around 80 kHz, and very good coherence in the frequency range from 30 to 180 kHz. Furthermore, experimental variability in ultrasonic pulse velocity and attenuation is substantially reduced compared to previously reported values from conventional UPV equipment. Findings from this study demonstrate that the embedded sensors have great potential as a low-cost solution for ultrasonic transducers for health monitoring of concrete in structures.

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Section: Testing Proceduresmentioning

confidence: 99%

Using piezoelectric sensors for ultrasonic pulse velocity measurements in concrete

Kee

Zhu

2013

Smart Mater. Struct.

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“…Study investigates surface waves propagating across a partially closed surface-breaking crack in concrete. Findings provide useful information for studying stress wave propagation across a partially closed crack and for applying, the surface wave based nondestructive testing methods to actual concrete structures [20].…”

Section: Methods Laboratorymentioning

confidence: 99%

Review of the Air-Coupled Impact-Echo Method for Non-Destructive Testing

Nowotarski

Dubas

Milwicz

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The article presents the general idea of Air-Coupled Impact-Echo (ACIE) method which is one of the non-destructive testing (NDT) techniques used in the construction industry. One of the main advantages of the general Impact Echo (IE) method is that it is sufficient to access from one side to that of the structure which greatly facilitate research in the road facilities or places which are difficult to access and diagnose. The main purpose of the article is to present state-of-the-art related to ACIE method based on the publications available at Thomson Reuters Web of Science Core Collection database (WOS) with the further analysis of the mentioned methods. Deeper analysis was also performed for the newest publications published within last 3 years related to ACIE for investigation on the subject of main focus of the researchers and scientists to try to define possible regions where additional examination and work is necessary. One of the main conclusions that comes from the performed analysis is that ACIE methods can be widely used for performing NDT of concrete structures and can be performed faster than standard IE method thanks to the Air-coupled sensors. What is more, 92.3% of the analysed recent research described in publications connected with ACIE was performed in laboratories, and only 23.1% in-situ on real structures. This indicates that method requires further research to prepare test stand ready to perform analysis on real objects outside laboratory conditions. Moreover, algorithms that are used for data processing and later presentation in ACIE method are still being developed and there is no universal solution available for all kinds of the existing and possible to find defects, which indicates possible research area for further works. Authors are of the opinion that emerging ACIE method could be good opportunity for ND testing especially for concrete structures. Development and refinement of test stands that will allow to perform in-situ tests could shorten the overall time of the research and with the connection of implementation of higher accuracy algorithms for data analysis better precision of defects localization can be achieved.

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“…This allows the shear waves to propagate through fresh concrete with less attenuation than typical ultrasonic transducers generate. The embedded bender elements may stay in concrete after the setting time test and can be used as ultrasonic sensors for long-term monitoring of the quality of concrete [13,22].…”

Section: Introductionmentioning

confidence: 99%

Monitoring setting and hardening process of mortar and concrete using ultrasonic shear waves

Liu

Zhu

Seraj

et al. 2014

Construction and Building Materials

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Air-Coupled Surface Wave Transmission Measurement Across a Partially Closed Surface-Breaking Crack in Concrete

Cited by 3 publications

References 7 publications

Using piezoelectric sensors for ultrasonic pulse velocity measurements in concrete

Using piezoelectric sensors for ultrasonic pulse velocity measurements in concrete

Review of the Air-Coupled Impact-Echo Method for Non-Destructive Testing

Monitoring setting and hardening process of mortar and concrete using ultrasonic shear waves

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