Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Abstract

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.

Frequency spectrum analysis of lightweight foamed concrete using microwave dielectric measurement technique

“…Furthermore, the dielectric constant of lightweight foamed concrete is expected to be <10 as the conventional concrete is around 5‐9 as stated in Ref. .…”

“…The measurements were made between 100 and 900 MHz, frequencies which are often used in geophysics and civil engineering for ground penetrating radar inspection. Chung et al discussed the dielectric characterization of concrete which is significant for the wireless structural health monitoring of concrete structures. The paper presented the results of the dielectric constant of Guo Biao (GB) concrete which refers to the concrete mixed and cast in accordance with the Chinese standard.…”

Determination of dielectric properties of unknown substrates using hybrid approach

“…In general, resonant methods based on shift of resonant frequency own a higher sensitivity than their nonresonant counterparts. Meanwhile, the coaxial probe method is considered as the wideband method, which has been widely employed to measure complex permittivity in the situations that require accurate and traceable applications 9‐14 . The measurement of complex permittivity can be divided into solid, liquid, gas and powder by material state.…”

“…The use of the coaxial probe method characterizes the dielectric properties of liquid materials at high temperatures, 12 and has reference data that can be traceable to international standards 13 . In Reference 14, coaxial probe was employed for the measurement of concrete's relative dielectric constant and thus evaluating compressive strength. Moreover, microstrip transmission lines have long been widely used for the measurements of dielectric permittivity of DSs, 15‐20 whereas the frequency‐domain measurement techniques at RF/microwave frequencies are also well‐known 21‐22 .…”

Structural Health Monitoring (SHM) of Civil Structures

“…Popular terms such as Internet of Things and smart structures were coined as a result of the intersection between advances in other engineering disciplines with civil engineering to produce the new field of structural health monitoring (SHM). The field of SHM is now at a vital crossroads, where researchers are challenged to develop technologies for the monitoring and retrofit of older buildings and at the same time to push the boundaries of SHM through the creative use of cutting-edge technologies and data processing algorithms.This issue is a snapshot of the newest research in SHM for civil structures, and it includes a range of topics such as data processing algorithms to detect damage, modeling, and simulation [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]; sensor development and experiments [16][17][18][19][20][21][22][23][24][25][26]; materials studies [27,28]; state-of-the-art reviews [29,30]; and case studies [31]. SHM is highly multi-disciplinary, and advances in other areas of study can likely be recruited for the progress of SHM.…”