Ultrasonic imaging of multi-layer concrete structures

Lin, Shibin; Shams, Sadegh; Choi, Hajin; Azari, Hoda

doi:10.1016/j.ndteint.2018.04.012

Cited by 72 publications

(31 citation statements)

References 15 publications

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“…The interactions between wavefield and the delamination have been analyzed by many researchers. Lin et al described a layered structure with an embedded delamination and illustrated the screenshots of the wave propagation [39]. The reflection and refraction seemed complex at the overlay-specimen interface as the wave propagation velocities were obviously different in multi-layers structure.…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track

et al. 2019

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This paper aims to adopt the total focusing method (TFM) and wavenumber method for characterizing a delamination in ballastless slab track. Twelve dry point contact (DPC) transducers located at the upper surface of the slab track compose a linear array. These transducers are employed to actuate shear waves, which are suitable for identifying the delamination. The technique of removing the surface wave has been implemented for only retaining the scattered wave caused by the delamination and the reflected wave from the bottom of bed plate. Numerical and experimental results demonstrate that the delamination and bottom of the bed plate can be identified by the proposed methods. Furthermore, the near-surface pseudomorphism is distinctly restrained after removing the surface wave. Compared to TFM, the wavenumber method has the great advantages of improving computational performance and lateral resolution. However, they have no significant difference in the longitudinal resolution. Furthermore, it has been confirmed that the lateral resolution can be affected by the amount of transducers. This paper can provide valuable suggestions on improving the computational performance and the imaging accuracy when we identify a delamination in ballastless slab track.

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Section: Numerical Simulationmentioning

confidence: 99%

Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track

et al. 2019

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“…The specimens were placed in a temperature chamber to give a controllable temperature range (Figure 4). The ultrasonic testing equipment, MIRA (17), was originally designed for ultrasonic imaging of concrete structures (18)(19)(20)(21). In this study, it was employed to examine the effect of temperature on asphalt properties through the analysis of direct shear-horizontal (SH) wave propagation in asphalt overlays.…”

Section: Effect Of Temperature On Asphalt Propertiesmentioning

confidence: 99%

Evaluation of the Impact Echo Method for Concrete Bridge Decks with Asphalt Overlays

Azari

Lin

2019

Transportation Research Record

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Asphalt overlays have been commonly used to extend the service life of deteriorated concrete bridge decks. Nonlinear, viscoelastic asphalt has properties that differ considerably from the properties of the underlying portland cement concrete (PCC) deck. The impact echo (IE) method has been extensively used to nondestructively evaluate PCC structures. The method, however, performs differently on asphalt overlays, especially when a membrane is placed between the overlay and the deck. The general recommendation has been to perform IE tests on asphalt overlays in cold weather. The temperature range under which IE can be used, however, is still uncertain. This study was conducted to systematically examine IE performance on asphalt overlays. Three PCC specimens with three types of asphalt overlays―asphalt with a liquid membrane, asphalt with a sheet membrane, and asphalt without a membrane―were tested in a temperature chamber. The three PCC specimens had identical designs, materials, and artificial defects. The nondestructive evaluation (NDE) results from the tests indicate that: (1) 32°F and below is the appropriate temperature range for IE to detect defects in the underlying deck; and (2) membranes can significantly reduce the propagation of waves into the underlying deck.

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“…In the pitch-catch method, one channel C i (i ∈ [1 : 11]) acting as a transmitter emits shear-wave pulse into the test object, and the other channels C j (j ∈ [(i + 1) : 12]) sequentially act as a receiver picking up direct and reflected pulse (a.k.a. echo) [16]. As a result, the 1st channel only acts as a transmitter while the 12th channel always serves as a receiver.…”

Section: Introductionmentioning

confidence: 99%

“…In practice, bridge components such as bridge decks include multiple-layers of overlays of different materials with varying shear-wave velocities. As a result, the proprietary software may underestimate or overestimate information on the multi-layer bridge deck (e.g., depth, thickness, internal defects) [16]. Also, the Hilbert transform used in the signal processing by the proprietary software may result in an inaccurate presentation of reflected waves at the backwalls or discontinuities (i.e., misleading information on the tested components).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic pitch and catch technique for non-destructive testing of reinforced concrete slabs

Zatar

Hai

Nghiem

2020

J Infrastruct Preserv Resil

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This study aims at evaluating reinforced concrete (RC) bridge elements using ultrasonic pitch and catch (UPC) non-destructive testing (NDT) technique. A validation reinforced concrete slab with two embedded layers of rebars and artificial defects (voids, honeycombs, and debondings) was designed and tested. A commercial UPC NDT device (hereafter called “UPC device”), which is based on the ultrasonic shear-wave test method using dry-point-contact transmitting and receiving transducers in a “pitch-catch” configuration, was used to map internal defects of the validation RC slab. The recorded data from the UPC device was analyzed using a modified synthetic aperture focusing technique (SAFT). A software was developed to reconstruct 2-D images of the RC slab cross-sections using novel signal filtering and processing techniques. The results revealed that the 2-D image reconstructed from the developed software accurately exhibited locations and horizontal dimensions of the steel rebars, voids, and debondings. In addition, the developed software was capable to provide much higher resolution and sharper images of the anomalies inside the RC slab compared to the UPC device’s proprietary imaging software.

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Ultrasonic imaging of multi-layer concrete structures

Cited by 72 publications

References 15 publications

Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track

Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track

Evaluation of the Impact Echo Method for Concrete Bridge Decks with Asphalt Overlays

Ultrasonic pitch and catch technique for non-destructive testing of reinforced concrete slabs

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