Dielectric properties of concrete and their influence on radar testing

Soutsos, Marios; Bungey, J. H.; Millard, S.G.; Shaw, M. R.; Patterson, A.

doi:10.1016/b978-008043717-0/50056-8

Cited by 46 publications

(69 citation statements)

References 2 publications

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“…A complex relative permittivity, which consists of real and imaginary parts (ε r − jε r ), is commonly used to quantitatively and qualitatively define the dielectric characterization of concrete materials [27][28][29][30][31]. The real part of the complex permittivity is also known as the dielectric constant, which indicates the amount of energy stored inside the concrete element.…”

Section: Methods Of Dielectric Constant Measurementmentioning

confidence: 99%

“…The use of the log-scale gives a clear insight into the regressions at low frequencies, whereas the linear scale plots provide the fit conditions at high frequencies, viz., 2 to 6 GHz. While dielectric permittivity models were only available in the literature up to 1 or 2 GHz, e.g., [29,41], the dielectric dispersion of concrete at higher frequencies is therefore the focus in this study. This is owing to the current popularity of wireless communication signals, such as the 4G cellular phone signals and the indoor WiFi signals, whose penetration abilities through concrete walls very much depend on the dielectric properties.…”

Section: Jonscher Modelmentioning

confidence: 99%

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Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Chung

Yuan

et al. 2017

Applied Sciences

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Dielectric characterization of concrete is essential for the wireless structural health monitoring (SHM) of concrete structures. Guo Biao (GB) concrete refers to the concrete mixed and cast in accordance with the Chinese standard. Currently, China is the largest producer and consumer of concrete in the world. However, minimal attention has been paid to the dielectric properties of GB concrete. This paper presents the results of the dielectric constant of GB concrete, where three regression models have been used to present the measurement data from 10 MHz to 6 GHz. The objective is to provide a data set of nominal values of the dielectric constant for ordinary GB concrete. The final goal is to facilitate a compressive strength evaluation via the measured dielectric constant. Measurements of the dielectric constant and compressive strength for five types of ordinary concrete have been undertaken, after 28 days of curing. As the main contribution in this work, the correlation model between the compressive strength and dielectric constant of GB concrete is realized.

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Section: Methods Of Dielectric Constant Measurementmentioning

confidence: 99%

Section: Jonscher Modelmentioning

confidence: 99%

Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Chung

Yuan

et al. 2017

Applied Sciences

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“…The complex permittivity of concrete varies with both the frequency and the moisture content. At any given frequency both dielectric constant and conductivity increase as moisture content increases [14][15][16][17][18]. For several moisture contents, [19][20][21][22] give analytical results of dielectric constant of concrete as function of frequency.…”

Section: Dielectric Properties Of Concretementioning

confidence: 99%

Embedded Antennas in Dry and Saturated Concrete for Application in Wireless Sensors

Jin¹,

Ali²

2010

PIER

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Abstract-Efficient embedded antennas are needed for future wireless structural health monitoring. The input return loss and transmission losses of a dipole, a planar inverted-F antenna (PIFA), a microstrip patch, and a loop antenna are studied at around 2.45 GHz when these antennas are embedded inside a concrete cylinder. Antenna performance is investigated in free-space, in air dried concrete and in saturated concrete with and without the presence of steel reinforcements. It is observed that the maximum transmission loss for a distance of 250 mm between antennas is around 50 dB which is acceptable for inside the bridge wireless communication between sensors.

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“…It should be emphasized that (6) indicates the 1/ω dependence of penetration depth to frequency. Typical values of conductivity and relative permittivity for concrete are σ = 10 −3 − 10 −1 S/m and ε r = 6 − 12 respectively, mainly depending on the percentage of concrete humidity and the depth below surface [6,7]. Moreover, several measurements concerning the measurement of attenuation (dB/cm) of E/M waves, considering concrete as the propagating media were conducted [5].…”

Section: Penetration Depth Of E/m Waves In Materials Mediamentioning

confidence: 99%

Development of a Three Band Radar System for Detecing Trapped Alive Humans Under Building Ruins

Bimpas¹,

Paraskevopoulos²,

Nikellis³

et al. 2004

PIER

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Abstract-This paper shows the ability to use a continuous wave (CW) radar as an instrument to search for trapped alive persons in demolished buildings and ruins. The utilized operation principle is the detection of the Doppler frequency shift of the E/M wave when it is reflected by a slightly moving part of a living human body. The presented system has gone through several prototype development phases. Many parameters and alternative implementations have been tested in both real and simulated sites. A system analysis is carried out and presented followed by a presentation of the signal processing techniques. The inherent difficulties for the realization and practical exploitation of such a system are discussed. Results from tests of the system are also presented.

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Dielectric properties of concrete and their influence on radar testing

Cited by 46 publications

References 2 publications

Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Embedded Antennas in Dry and Saturated Concrete for Application in Wireless Sensors

Development of a Three Band Radar System for Detecing Trapped Alive Humans Under Building Ruins

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