混凝土内部裂缝对电磁波传输特性参数的影响

doi:10.11720/wtyht.2022.1248

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Abstract

The occurrence and development characteristics of concrete cracks are important characterization parameters of concrete health. Given that steel reinforcement is the inherent structure of concrete, this paper proposes a method for monitoring cracks in concrete using steel reinforcement antennae. In this method, a steel reinforcement transmitting and receiving antenna pair embedded in concrete is set, and the cracks in concrete are detected according to the amplitude of the antenna pair' parameter S₂₁ that can reflect electromagnetic wave propagation. To this end, a simulation model based on the CST Studio Suite software was constructed to calculate the amplitude of S₂₁ using the software. The relationship between the amplitude of S₂₁ and the crack state was analyzed. The results show that the state of cracks in concrete has a significant impact on the amplitude of S₂₁, and thus the cracks can be detected according to the characteristics of the amplitude of S₂₁. The cracks can be identified if the ratio between the amplitude of S₂₁ obtained using the models with and without cracks exceeds a certain threshold. Meanwhile, the corresponding frequency band that can identify the cracks is defined as the characteristic frequency band of cracks. The simulation results show that the amplitude of S₂₁ significantly changes with different crack thickness, crack angles, and crack positions. Therefore, the concrete cracks and their characteristics can be judged from the amplitude of S₂₁ by setting up a steel reinforcement transmitting and receiving antenna pair in concrete.

Key words： concrete crack reinforced antenna electromagnetic wave S parameter amplitude

Received: 07 May 2021 Published: 25 February 2022

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	Xiao DING
	Si-Te MO
	Bi-Xiong LI
	Hua HUANG

Cite this article:

Xiao DING,Si-Te MO,Bi-Xiong LI, et al. Impacts of cracks in concrete on characteristic parameters of electromagnetic wave transmission[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 160-168.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1248 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/160

Propagation of electromagnetic wave in concrete cracks

Transmitting antenna and receiving antenna

Electromagnetic wave propagation model

Benchmark simulation model

Other models

Simulation model parameter information

Combined graph of S₂₁ parameters with and without cracks in the frequency range of 5~10 GHz

S₂₁ parameter takes logarithm as the ratio of crack and no crack in the frequency range of 5~10 GHz

Characteristic frequency band for very easy identification of cracks

The modulus of S₂₁ parameters with different crack thickness in the frequency range of 5~10 GHz

Q S 21 with different crack thickness in the frequency range of 5~10 GHz
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The ratio $Q S 21$ with different crack thickness in the frequency range of 5~10 GHz

Comparison of identification effect of different crack thickness

Characteristic frequency band near common center frequency of crack with different thickness

The modulus of S₂₁ parameters with different crack angles in the frequency range of 5~10 GHz

Comparison of identification effect of different crack angles

Q S 21 of crack to no crack of S₂₁ amplitude in the frequency range of 5~10 GHz (M11,M23,M26,M29)
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The ratio $Q S 21$ of crack to no crack of S₂₁ amplitude in the frequency range of 5~10 GHz (M11,M23,M26,M29)

Characteristic frequency band near common center frequency of crack with different angles

The modulus of S₂₁ parameters with different crack locations in the frequency range of 5~10 GHz

Q S 21 of crack to no crack of S₂₁ amplitude in the frequency range of 5~10 GHz(M11,M31,M32,M33)
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The ratio $Q S 21$ of crack to no crack of S₂₁ amplitude in the frequency range of 5~10 GHz(M11,M31,M32,M33)

Comparison of identification effect of different crack locations

Characteristic frequency band near common center frequency of crack with different locations

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