behavioural study of surface rayleigh waves in concrete
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Behavioural study of surface Rayleigh waves in concrete ...

2019-9-5  Behavioural study of surface Rayleigh waves in concrete structure containing delamination. Chi Hoe Liew 1, Foo Wei Lee 1, Dick Si Tan 1, Jee Hock Lim 1, Ming

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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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Detection of Surface Breaking Cracks in Concrete

2019-10-31  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 for Rayleigh wave propagation in members with rectangular cross-section followed by an experimental study with a concrete beam.

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USE OF RAYLEIGH WAVE METHODS TO DETECT NEAR

2004-11-6  In this paper, applications of recent multistation Rayleigh wave methods were presented. Experiments have been conducted on large volume concrete blocks (8 m3). Different typical near surface pathologies common to the downstream wall of concrete dams were induced in these blocks. In order to reduce the contribution of higher Rayleigh wave modes in the classical SASW method, a new multichannel configuration setup with filtering window and averaging approach is used to test concrete homogeneity and detect poor surface concrete quality, voids, and horizontally cracking planes. Accuracy of a new reliable signal processing technique based on frequency-wavenumber analysis of the wavefield data was demonstrated on a stratified three layers concrete volume. Results show that this new technology can be applied on existing full scale concrete

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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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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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Evaluation of Early-Age Concrete Compressive Strength

2017-10-7  concrete surface. Rayleigh waves have been adopted by many researchers for nondestructive testing purposes [18–21]. When generated in concrete, Rayleigh waves propagate along the free surface of the concrete. In this study, surface waves that propagate along the interface between concrete

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Numerical simulation of surface wave propagation in ...

2009-9-1  This paper presents a numerical study of surface wave propagation in an elastic matrix with different shape and size of thin inclusions that simulate distributed damage keeping the content constant. The longitudinal and Rayleigh wave velocity change almost up to 15% depending on the inclusion shape, while the experimental variance is also ...

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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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Near Surface Characterization Of Concrete Structures

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

2020-7-29  In the following section, we develop the theory underpinning Rayleigh-wave propagation guided by the traction-free surface of a CTSCM. Given the usual symmetries of the stress and strain tensors [], the Kelvin notation [20,46] is used, whereby both stress and strain are represented by 6-column vectors, displacement by a 3-column vector and both stiffness and compliance are 6 × 6

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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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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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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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Analysis of coherent surface wave dispersion and ...

2021-7-8  70 way to generate Rayleigh waves is the use of a pencil lead break in [17, 18], which produces a 71 point-like source with a bandwidth0-200 kHz, but with very low energy : piezoelectric transduc- 72 ers were used for the reception at short distance away from the source. The medium was mortar 73 with small thin vinyl plate inclusions, simulating small cracks in cement.

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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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PAPER OPEN ACCESS ...

2021-8-11  compaction detection [4,5] measured the thickness of the aging layer of the concrete surface by using the frequency dispersion characteristics of Rayleigh wave in the layered medium. Ayolabi et al. [6]used the MASW method to study the causes of highway damage and to measure the cause of the damage to loose compaction of road-based materials.

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Propagation and attenuation of Rayleigh and pseudo

2021-3-30  In this work, we investigate the propagation and attenuation of the Rayleigh and pseudo surface waves (PSWs) in two types of viscoelastic seismic metamaterials, namely, pillared and inclusion-embedded metamaterials, by analyzing the complex band structures and transmission spectra. The complex band structure developed in this work reveals for ...

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Rayleigh surface waves for characterization of the air ...

2010-4-8  Thus, laboratory experiments have been conducted to investigate Rayleigh surface waves for characterization of porosity in fresh concrete. A mediator mounted onto a Plexiglas wedge is used to introduce waves from an ultrasonic transducer onto the surface of the concrete. The challenges are that fresh concrete is highly attenuative and that the ...

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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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Analytical study of the sensitivity of Rayleigh wave for ...

It is then necessary to characterize the porosity in the first cm above the steel bars. For surface measurements the most energetic mode is the Rayleigh wave whose investigation depth is around a half wavelength. A large spectrum, with frequency between 50 kHz and 600 kHz, is used in order to obtain a porosity depth profile of the concrete cover.

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Vibration Isolation Mechanism of Concrete Piles for ...

To study the propagation characteristics of Rayleigh waves and the isolation mechanism of a single-row of piles by isolation effects, in this paper we draw a two-dimensional contour map of ζ (normalized acceleration amplitude relative to a measure close at the vibration source) using a vibration test carried out on a sand foundation.

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Control of Rayleigh-like waves in thick plate Willis ...

2016-12-15  Recent advances in control of anthropic seismic sources in structured soil led us to explore interactions of elastic waves propagating in plates (with soil parameters) structured with concrete pillars buried in the soil. Pillars are 2 m in diameter, 30 m in depth and the plate is 50 m in thickness. We study the frequency range 5 to 10 Hz, for which Rayleigh wave wavelengths are smaller than ...

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Free surface (Rayleigh) waves in anisotropic elastic half ...

An alternative framework relying on the surface impedance tensor is capable of settling the same issues; that framework is developed and fully exploited in the present work. The same framework may be used to study thoroughly the existence of Stoneley waves in bonded anisotropic half-spaces, which is the subject of an accompanying paper.

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A note on formulas for the Rayleigh wave speed in elastic ...

An approximate method is presented to determine the velocity of Rayleigh waves. The least-squares approximation is suggested to transform secular equations to quadratic equations. Several explicit ...

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Crack Depth Estimation in Concrete Using Energy ...

Crack Depth Estimation in Concrete Using Energy Transmission of Surface Waves. A promising nondestructive concrete surface-breaking crack depth inspection technique is the self-calibrating surface wave transmission method. In part due to measurement data variability, however, there is difficulty in using the transmission function cut-off ...

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

2017-9-13  where the and are shear viscosity coefficient, thermal conductivity coefficient, heat capacity at constant pressure and specific heat capacity, respectively. It is clear from equations and that the absorption attenuation coefficient of stress waves in concrete is directly proportional to the square of the stress wave frequency.Compared with equation (), the number of undetermined parameters in ...

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