On Variants of the Frequency Power Law for the Electromagnetic Characterization of Hydraulic Concrete

Ihamouten, Amine; Chahine, Khaled; Baltazart, Vincent; Villain, Géraldine; Dérobert, Xavier

doi:10.1109/tim.2011.2138210

Cited by 29 publications

(14 citation statements)

References 18 publications

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“…This EM cell enables to characterize material samples in the range in laboratory. The equations of the fitting dispersion curves are provided by the 4p variant of Jonscher's model [11,16]. Moreover, it is shown here that the dispersion curves can be extrapolated on very wide frequency band [30-2000 MHz].…”

Section: /25mentioning

confidence: 99%

“…For this purpose, several techniques have been developed, with varying degrees of success, in order to describe the frequency dependence of the dielectric permittivity of geological and civil engineering materials [8][9][10][11][12][13][14][15][16][17]. This frequency dependence of complex permittivity has introduced the notion of material dispersion [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Villain

Ihamouten²,

Dérobert

2017

NDT & E International

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This paper deals with the development and the validation of an innovative, easy-to-use and on site technique for determination of concrete water content. The on-site technique is the capacitive probe, able to characterize in situ dielectric media in the 30-35 MHz frequency band (around 33 MHz). For the evaluation of water content in various civil engineering structures, a calibration methodology has to be developed and is presented herein. It is based on the complex permittivity estimation of various dispersive concretes, which is carried out by a cylindrical coaxial electromagnetic (EM) transition line allowing the characterization in laboratory of material samples in a large GPR frequency bandwidth [50-600 MHz]. This methodology consists then on a coupling between the results of both the capacitive probes and the coaxial EM cell extrapolated at low frequency (33 MHz). The extrapolation procedure used to link physically the results of the two techniques is provided by the 4p-variant of Jonscher's model which is parameterized to obtain dispersion curves of the complex permittivity for very wide frequency bands. The methodology is checked by a parametric study that associates the 4p variant of Jonscher's model with the physical and hydric characteristics of the six concrete mix designs representing high performance and ordinary concretes at various hydric states. The surface testing results measured by capacitive probes on slabs are successfully compared to the extrapolated results obtained on cores.

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Section: /25mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Villain

Ihamouten²,

Dérobert

2017

NDT & E International

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“…The dispersion in the pavement materials is described by Jonscher's model, which has performed well in describing the frequency dependence of effective permittivity ε e in materials of civil engineering interest (Ihamouten et al . ). To simplify the computation and the measurement configuration in the model, the spatial distribution in the near field is assumed to be constant with a single‐point transceiver, as the antenna height is 4 cm over the studied medium.…”

Section: Non‐destructive Monitoring Techniquesmentioning

confidence: 97%

The use of impulse and stepped‐frequency radar to characterize the hydric behaviour of a porous pavement structure

Dérobert¹,

Ihamouten

Guilbert

et al. 2019

Near Surface Geophysics

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This study focusses on examining the behaviour of an innovative asphalt pavement which is created as a solar energy collector, using non‐destructive testing involving ground‐penetrating radar. The concept of heat exchanger is based on the use of drainage asphalt in the bonding layer through which a heated fluid flows via gravity to de‐ice the roadway. In order to develop hydrothermal models for a test site representing such a pavement, the saturated porous layer assumption was required when the water level in each tank (up‐ and downstream of the structure) was same as the top of the porous layer. Two ground‐penetrating radar techniques were tested at this test site: a ground‐coupled impulse radar and an air‐coupled stepped‐frequency radar. The impulse ground‐penetrating radar, a high‐efficiency non‐destructive testing technique which is widely used in civil engineering, provides accurate geometric information, especially for pavement investigation. In the second innovative approach, air‐coupled stepped‐frequency radar was combined with full‐waveform inversion to obtain quantitative information, while retrieving the electromagnetic properties of the successive pavement layers. We concentrated on the early‐stage water imbibition in the pavement structure using the impulse ground‐penetrating radar to estimate the fluid transfer velocity and both ground‐penetrating radar techniques to verify the saturated porous layer assumption in the steady state. Ground‐coupled radar enabled us to follow the water front and to capture different water‐transfer behaviours in the porous asphalt layer. Our observation could be explained by the vertical topology of the upper watertight interface. Air‐coupled stepped‐frequency ground‐penetrating radar presented similar results to ground‐coupled ground‐penetrating radar but provided a quantitative estimate of the changes within the porous layer during the test.

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“…The attraction of the NRW characterization method results from the availability of closed-form expressions for μ and . This contrasts with methods requiring an iterative solver such as Newton's method [18] or a least squares approach [19]. The convenience of the NRW method, and its insensitivity to propagation of measurement uncertainties, commonly makes it a first choice for material characterization.…”

Section: Materials Characterization Proceduresmentioning

confidence: 99%

A Waveguide Verification Standard Design Procedure for the Microwave Characterization of Magnetic Materials

Crowgey

Tang

Rothwell

et al. 2015

PIER

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Abstract-A waveguide standard is introduced for validation purposes on the measurement accuracy of electric and magnetic properties of materials at microwave frequencies. The standard acts as a surrogate material with both electric and magnetic properties and is useful for verifying systems designed to characterize engineered materials using the Nicolson-Ross-Weir technique. A genetic algorithm is used to optimize the all-metallic structure to produce a surrogate with both relative permittivity and permeability within a target range across S-band. A mode-matching approach allows the user to predict the material properties with high accuracy, and thus compensate for differences in geometry due to loose fabrication tolerances or limited availability of component parts. The mode-matching method also allows the user to design standards that may be used within other measurement bands. An example standard is characterized experimentally, the errors due to uncertainties in measured dimensions and to experimental repeatability are explored, and the usefulness of the standard as a verification tool is validated.

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On Variants of the Frequency Power Law for the Electromagnetic Characterization of Hydraulic Concrete

Cited by 29 publications

References 18 publications

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

Determination of concrete water content by coupling electromagnetic methods: Coaxial/cylindrical transition line with capacitive probes

The use of impulse and stepped‐frequency radar to characterize the hydric behaviour of a porous pavement structure

A Waveguide Verification Standard Design Procedure for the Microwave Characterization of Magnetic Materials

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