Theoretical Analyses and Experimental Research on a Cement Concrete Dielectric Model

Meng, Meili; Wang, Fuming

doi:10.1061/(asce)mt.1943-5533.0000755

Cited by 20 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) The carbon nanofiber reinforced concrete can be considered as composed of three independent phases, matrix (mortar), coarse aggregate (limestone gravel) and air, and the dielectric models of carbon nanofiber reinforced concrete with different degrees of fiber content can be effectively established based on the Brown model, CRIM model and Looyenga model. (2) The goodness of fit between the calculated curves based on the three modified models and the measured curves was very high, and the variation rule for the dielectric constant of carbon nanofiber concrete with the frequency of electromagnetic wave can be described accurately. (3) For the ε , and ε " as dielectric constants calculated based on the modified models, the errors relative to corresponding measured values were effectively controlled.…”

Section: Discussionmentioning

confidence: 92%

“…The formula describing the relationship between the dielectric constant of a composite and the dielectric constants or volume rates of its components is called a dielectric model [1,2]. Based on the model, the dielectric properties and main influence factors of composites can be understood in detail, so as to support relevant theoretical analysis [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric Model of Carbon Nanofiber Reinforced Concrete

Wang

Bai

et al. 2020

Materials

View full text Add to dashboard Cite

The formula describing the relationship between the dielectric constant of a composite and the dielectric constants or volume rates of its components is called a dielectric model. The establishment of a cement concrete dielectric model is the basic and key technique for applying electromagnetic wave technology to concrete structure quality testing and internal damage detection. To construct the dielectric model of carbon nanofiber reinforced concrete, the carbon nanofiber reinforced concrete was measured by the transmission and reflection method for dielectric constant ε, and ε,, in the frequency range of 1.7~2.6 GHz as the fiber content was 0, 0.1%, 0.2%, 0.3% and 0.5%. Meanwhile, concrete was considered as a composite material composed of three phases, matrix (mortar), coarse aggregate (limestone gravel) and air, and the dielectric constants and volume rates of each component phase were tested. The Brown model, CRIM (Complex Refractive Index Model) model and Looyenga model commonly used in composite materials were modified based on the experimental data, suitable dielectric models of carbon nanofiber reinforced concrete were constructed, and a reliability check and error analysis of the modified models were carried out. The results showed that the goodness of fit between the calculated curves based on the three modified models and the measured curves was very high, the accuracy and applicability were very strong and the variation rule for the dielectric constant of carbon nanofiber concrete with the frequency of electromagnetic wave could be described accurately. For ε, and ε,,, the error between the dielectric constant calculated by the three modified models and the corresponding measured values was very small. For the dielectric constant ε,, the average error was maintained below 1.2%, and the minimum error was only 0.35%; for the dielectric constant ε,,, the average error was maintained below 3.55%.

show abstract

Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Dielectric Model of Carbon Nanofiber Reinforced Concrete

Wang

Bai

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…Polyurethane grouting materials are usually mixed and reacted by two materials of polyol and isocyanate to form a two-phase body with a certain strength, so its dielectric properties can be characterized by a composite dielectric model [13]. The establishment of a comprehensive dielectric model shows the functional relationship between the relative permittivity of composite materials and the relative permittivity of their components [14,15].…”

Section: Introductionmentioning

confidence: 99%

Construction of Dielectric Model of Nonaqueous Reactive Polyurethane Grouting Materials

Meng

Chen

2022

Advances in Polymer Technology

Self Cite

View full text Add to dashboard Cite

In order to reveal the dielectric properties of the nonaqueous reactive polyurethane grouting material, combined with the electron microscope test analysis, it can be seen that the nonaqueous reactive polyurethane material is a porous two-phase body composed of a polyurethane matrix and closed cells. At the microscopic scale, the porous two-phase physical model is established, and the dielectric model of the material is constructed on this basis. In order to verify the dielectric model, 40 groups of nonaqueous reactive polyurethane specimens with different densities were designed and prepared in this paper. The dielectric permittivity was measured by a vector network analyzer (VNA) with an open coaxial probe within the frequency range of 1050 MHz~5010 MHz for the first time, and the dielectric properties and influencing factors were revealed according to the test data. The result shows that the dielectric permittivity of nonaqueous reactive polyurethane materials increases with the increase of density, and decreases slightly with the increase of frequency. Compared with the three models of the Rule of Mixture, Clausius-Mossotti Model and Lichtenecker Model, the calculation accuracy of the Maxwell-Garnett Model is higher, and the calculation results are more consistent with the experimental results of nonaqueous reactive polyurethane grouting materials. The experimental results can be applied to the nondestructive testing of polyurethane grouting materials and provide reference and basis for the quality evaluation of polymer structures.

show abstract

“…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%

Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Chung

Yuan

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

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.

show abstract

Theoretical Analyses and Experimental Research on a Cement Concrete Dielectric Model

Cited by 20 publications

References 7 publications

Dielectric Model of Carbon Nanofiber Reinforced Concrete

Dielectric Model of Carbon Nanofiber Reinforced Concrete

Construction of Dielectric Model of Nonaqueous Reactive Polyurethane Grouting Materials

Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Contact Info

Product

Resources

About