behavioural study of surface rayleigh waves in concrete

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Behavioural study of surface Rayleigh waves in concrete ...

2019-9-5  In this study, Rayleigh wave (R-wave) is proposed to determine the extent of delamination in concrete. Numerical simulations were carried out to examine the behaviour of R-waves propagated through the concrete medium with different concrete delamination conditions, i.e., top delamination and bottom delamination.

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Behavioural study of surface Rayleigh waves in concrete ...

Request PDF Behavioural study of surface Rayleigh waves in concrete structure containing delamination Delamination is one of the defects that cause concrete structures to fail in structural ...

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[PDF] Behavioural Study of Concrete Surface Crack Filling ...

Behavioural Study of Concrete Surface Crack Filling Conditions on Surface Rayleigh Wave @inproceedings{Liew2019BehaviouralSO, title={Behavioural Study of Concrete Surface Crack Filling Conditions on Surface Rayleigh Wave}, author={Chi Hoe Liew and F. W. Lee and Y. L. Lee and M. H. Lim}, year={2019} }

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Characterizing concrete surface notch using Rayleigh wave ...

2017-4-1  A multichannel Rayleigh wave (R-wave) measurement technique is proposed for evaluating concrete surface notches with different orientations. In this study, numerical simulations were first conducted to examine the propagation of R-waves in steel-reinforced concrete comprising of surface notch inclining at 30°, 90° and 150° against the horizontal plane.

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(PDF) Detection of Surface Breaking Cracks in Concrete ...

This study examines the use of Rayleigh waves for the detection and sizing of surface-breaking cracks in concrete members. First, finite element simulations are performed to define the conditions ...

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(PDF) USE OF RAYLEIGH WAVE METHODS TO DETECT NEAR SURFACE ...

The use of Rayleigh waves in non invasive methods, appear to be a promising approach for the determination of concrete stiffness profile. Rayleigh waves propagate in cylindrical wave

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Characterization of ultrasonic Rayleigh surface waves in ...

2009-10-1  This research examines the application of ultrasonic Rayleigh surface waves to the non-destructive evaluation (NDE) of asphaltic concrete in the frequency range 40–100. kHz.. Two ultrasonic parameters, the phase velocity and amplitude attenuation, are considered to be sensitive to local compositional and structural variations and are measured.

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Air-coupled detection of nonlinear Rayleigh surface waves ...

2014-10-1  This paper presents a new experimental technique for the application of SHG in Rayleigh surface waves in cement-based materials. A non-contact detection procedure using an air-coupled transducer is proposed to improve the applicability of nonlinear ultrasonic measurements for the possible in-situ interrogation of concrete structural components ...

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Non-contact detection of surface waves in concrete using ...

2002-5-14  This research investigates air-coupled sensors used for non-contact NDT of concrete structures. An air-coupled sensor detects propagating leaky surface waves generated by a point impact event applied on the concrete surface. Compared to conventional body waves, leaky surface waves can be easily detected by the sensor due to the large out-of-plane motion of the waves.

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Rayleigh Wave Propagation for the Detection of Near ...

The paper presents a finite element study designed to gain physical insight into the effect of surface discontinuities on Rayleigh wave propagation in structural elements. In particular, a series of array measurements at various locations within a plate are simulated and compared with experimental measurements. Conversion of array measurements into the frequency-wavenumber domain reveals ...

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(PDF) Detection of Surface Breaking Cracks in Concrete ...

This study examines the use of Rayleigh waves for the detection and sizing of surface-breaking cracks in concrete members. First, finite element simulations are performed to define the conditions ...

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(PDF) USE OF RAYLEIGH WAVE METHODS TO DETECT NEAR SURFACE ...

The use of Rayleigh waves in non invasive methods, appear to be a promising approach for the determination of concrete stiffness profile. Rayleigh waves propagate in cylindrical wave fronts ...

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Non-destructive testing of high strength concrete using ...

2003-6-1  This study concentrates on Rayleigh-type surface waves because 67% of stress wave energy propagates as Rayleigh waves. The speed of a Rayleigh wave depends on its wavelength and on the variation of the elastic moduli with depth in the solid. The depth to which the Rayleigh wave cause a disturbance is about a wavelength.

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Multiple Rayleigh waves guided by the planar surface of a ...

2020-7-29  The Rayleigh wave with q = 33.19 mm −1 is less localized to the surface x 3 = 0; this surface wave decays relatively slowly as x 3 increases and still substantially exists at x 3 = 10Ω. The decaying periodic undulations in the x 3 direction for both of these Rayleigh waves are in accord with the Floquet theory [ 51 ] applicable due to the ...

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Non-contact detection of surface waves in concrete using ...

2002-5-14  Compared to conventional body waves, leaky surface waves can be easily detected by the sensor due to the large out-of-plane motion of the waves. The computed velocity of the sensed leaky waves indicates the nature of the wave: Rayleigh surface waves are generated in the thick wall and Lamb waves in the thin slab. The study

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Rayleigh wave propagation and scattering characteristics ...

2018-1-30  To study Rayleigh wave propagation and scattering characteristics at debonding in the FRP-retrofitted concrete structures, two concrete blocks with Young’s modulus of 26.8 GPa, density of 2350 kg/m 3 and a maximum aggregate size of 10 mm were cast and cured. The dimensions of the concrete blocks are 300 mm × 600 mm × 300 mm (W × L × H).

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Structural Health Monitoring Rayleigh wave propagation

2019-7-23  Therefore, applications of Rayleigh wave to detect surface and near-surface damage in con-crete have been considered.38 A numerical model was developed by Hevin et al.39 to characterise concrete sur- ... A study on the repair eva-luation of concrete surface cracks was presented by Aggelis and Shiotani42 using surface and through-transmission waves.

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Modeling of the attenuation of stress waves in concrete ...

2017-9-13  In this paper, a simple and effective absorption attenuation model of stress waves in concrete is developed based on the Rayleigh damping model, which indicates that the absorption attenuation coefficient of stress waves in concrete is directly proportional to the square of the stress wave frequency when the damping ratio is small.

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Drying shrinkage in concrete assessed by nonlinear ...

2017-2-1  Drying shrinkage by moisture migration from concrete to its environment causes stress and microcracking and can lead to larger crack formation, which compromises performance. Here, the process of drying is monitored by the SHG method using nonlinear Rayleigh surface waves to obtain the acoustic nonlinearity parameter.

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Condition assessment of concrete in hydraulic structures ...

2008-5-16  Maintenance and rehabilitation of concrete structures affected by alkali-aggregate reaction (AAR) require conducting detailed assessment of the concrete conditions, mainly close to the surface where the damage is more severe. This paper presents in situ investigations by surface wave testing of near-surface AAR damage in two hydraulic structures. The survey was carried out using a non ...

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Near Surface Characterization Of Concrete Structures Using ...

The deterioration of the near surface concrete minimises the structural behaviour, capacity, and working lifespan for civil engineering structures and dams. Repair strategy and maintenance require careful examination and determination of the degraded depth. In this aim, dispersive properties of Rayleigh waves are used to detect concrete stratification and cracks.

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Characterization of ultrasonic Rayleigh surface waves in ...

Abstract. This research examines the application of ultrasonic Rayleigh surface waves to the non-destructive evaluation (NDE) of asphaltic concrete in the frequency range 40–100 kHz. Two ...

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IDEALS @ Illinois: Acoustoelastic effects of surface waves ...

Surface waves Rayleigh waves Ultrasound Wave detection: Abstract: This investigation focuses on the study of acoustoelastic effects on Rayleigh surface waves (R-waves) in concrete samples subjected to 4-point load bending and uniaxial compression, considering a broad range of strain levels.

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Structural Health Monitoring Rayleigh wave propagation

2019-7-23  Therefore, applications of Rayleigh wave to detect surface and near-surface damage in con-crete have been considered.38 A numerical model was developed by Hevin et al.39 to characterise concrete sur- ... A study on the repair eva-luation of concrete surface cracks was presented by Aggelis and Shiotani42 using surface and through-transmission waves.

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CHARACTERIZATION OF DISPERSIVE ULTRASONIC RAYLEIGH SURFACE ...

2008-3-10  This research focuses on the application of ultrasonic Rayleigh surface waves to nondestructively characterize the mechanical properties and structural defects (non‐uniformly distributed aggregate) in asphalt concrete. An efficient wedge technique is developed in this study to generate Rayleigh surface waves that is shown to be effective in characterizing Rayleigh waves in this highly ...

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Evaluation of near surface material degradation in ...

Comparative studies of nondestructive evaluation methods have shown that nonlinear ultrasonic techniques are more sensitive than conventional linear methods to changes in material microstructure and the associated small-scale damage. Many of the material degradation processes such as carbonation in concrete, corrosion in metals, etc., initiate at the surface.

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Condition assessment of concrete in hydraulic structures ...

2008-5-16  Maintenance and rehabilitation of concrete structures affected by alkali-aggregate reaction (AAR) require conducting detailed assessment of the concrete conditions, mainly close to the surface where the damage is more severe. This paper presents in situ investigations by surface wave testing of near-surface AAR damage in two hydraulic structures. The survey was carried out using a non ...

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SINGLE- AND MULTI-COMPONENT INVERSION OF

2017-10-23  Rayleigh waves. On the other side, in case a shear source is adopted, the produced Love waves are recorded along the T component. For the present work, we only consider Rayleigh waves, so just the Z and R components. We considered four objects for the holistic (i.e. joint) analysis of Rayleigh waves: 1. the group-velocity spectrum of the Z ...

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Non-contact NDT of Concrete Structures Using Air

coupled sensing enables the study of the effect of defects on wave attenuation. The ex-perimental results show leaky Rayleigh waves are sensitive to the existence of cracks in concrete when waves propagate across cracks; the crack positions are clearly located in a 2-D scanning test image. The second application is air-coupled impact-echo.

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Measurement of surface wave transmission coefficient ...

2003-1-28  In this paper, a technique for measuring a surface wave transmission coefficient across surface-breaking cracks and notches in a heterogeneous but globally isotropic material (concrete) is presented. Once the transmission coefficient across a surface discontinuity is known, its depth may be estimated. There are many difficulties in measuring the transmission coefficient experimentally owing

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