Dielectric Characterization of Chinese Standard Concrete for Compressive Strength Evaluation

Kwok Chung,Lei Yuan,Songtao Ji,Li Sun,Chengping Qu,Chunwei Zhang

doi:10.3390/app7020177

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.

Highlights

Concrete is a heterogeneous cementitious material and the second most consumed material in the world
Correlation between compressive strength and dielectric constant of each concrete can be determined at any frequency up to constant of each Guo Biao (GB) concrete can be determined at any frequency up to 10 GHz
This paper presents the dielectric characterization of GB concrete, using three permittivity

Summary

Introduction

Concrete is a heterogeneous cementitious material and the second most consumed material in the world. Concrete has long been used for all types of civil structures worldwide. In China, abundant megaprojects use cement concrete as basic building blocks, or as precast beam components in civil structures. According to the Chinese National Bureau of Statistics, China’s commodity concrete production was 1.64 billion cubic meters (BCMs) in 2015, and when compared to the value of 0.74 BCMs in 2011, it has increased by 222% [1]. This value indicates that China is the largest producer and consumer of concrete in the world, and its production roughly occupies about 15% of global production. The compressive strengths are both classified as C30, C35, C40, and so on, indicating that the minimum values of the corresponding compressive strengths are

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