Electromagnetic wave absorption properties of cement-based composites filled with porous materials

Li, Baoyi; Duan, Yuping; Zhang, Yuefang; Liu, Shunhua

doi:10.1016/j.matdes.2010.12.017

Cited by 76 publications

(13 citation statements)

References 20 publications

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“…The lightweight coarse aggregate had a porous interior, so its EM-wave absorbing characteristics were superior to those of the coarse aggregate. This property tended to improve the shielding effectiveness of LC-SS15 [52].…”

Section: Shielding Effectivenessmentioning

confidence: 96%

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

et al. 2021

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There is increased interest in applying electromagnetic (EM) shielding to prevent EM interference, which destroys electronic circuits. The EM shielding’s performance is closely related to the electrical conductivity and can be improved by incorporating conductive materials. The weight of a structure can be reduced by incorporating lightweight aggregates and replacing the steel rebars with CFRP rebars. In this study, the effects of lightweight coarse aggregate and CFRP rebars on the mechanical and electrical characteristics of concrete were investigated, considering the steel fibers’ incorporation. The lightweight coarse aggregates decreased the density and strength of concrete and increased the electrical conductivity of the concrete, owing to its metallic contents. The steel fibers further increased the electrical conductivity of the lightweight aggregate concrete. These components improved the EM shielding performance, and the steel fibers showed the best performance by increasing shielding effectiveness by at least 23 dB. The CFRP rebars behaved similarly to steel rebars because of their carbon fiber content. When no steel fiber was mixed, the shielding effectiveness increased by approximately 2.8 times with reduced spacing of CFRP rebars. This study demonstrates that lightweight aggregate concrete reinforced with steel fibers exhibits superior mechanical and electrical characteristics for concrete and construction industries.

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Section: Shielding Effectivenessmentioning

confidence: 96%

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

et al. 2021

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Section: Electromagnetic Interference (Emi) Shielding Mechanismmentioning

confidence: 99%

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

et al. 2022

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This review aims to consolidate scattered literature on thermally sprayed coatings with nonionizing electromagnetic (EM) wave absorption and shielding over specific wavelengths potentially useful in diverse applications (e.g., microwave to millimeter wave, solar selective, photocatalytic, interference shielding, thermal barrier‐heat/emissivity). Materials EM properties such as electric permittivity, magnetic permeability, electrical conductivity, and dielectric loss are critical due to which a material can respond to absorbed, reflected, transmitted, or may excite surface electromagnetic waves at frequencies typical of electromagnetic radiations. Thermal spraying is a standard industrial practice used for depositing coatings where the sprayed layer is formed by successive impact of fully or partially molten droplets/particles of a material exposed to high or moderate temperatures and velocities. However, as an emerging novel application of an existing thermal spray techniques, some special considerations are warranted for targeted development involving relevant characterization. Key potential research areas of development relating to material selection and coating fabrication strategies and their impact on existing practices in the field are identified. The study shows a research gap in the feedstock materials design and doping, and their complex selection covered by thermally sprayed coatings that can be critical to advancing applications exploiting their electromagnetic properties.

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“…Besides, C‐band radar operating at 5.6 GHz can be used in meteorological field . With respect to the field of microwave dielectric measurement, the dielectric and magnetic characterization of some composite materials is very important, such as ferrite magnetic material Ni–Fe 3 O 4 , cement‐based composites filled with porous materials, hierarchical cobalt dendrites based on nanoflake, and SrTiO 3 thin film . All these materials have a well‐defined resonance peak around 5.6 GHz.…”

Section: Numerical Modelingmentioning

confidence: 99%

Improved approach using symmetric microstrip sensor for accurate measurement of complex permittivity

Sun

Tang

2018

Int J RF Microw Comput Aided Eng

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A novel symmetrical planar sensor based on splitter/combiner microstrip sections with a pair of interdigital capacitors (IDCs) and 2 complementary split ring resonators (CSRRs) structure is presented. A high sensitivity area to the dielectric property of surrounding materials has been established by locating IDC unit on the top‐plane while a rectangular CSRR structure etched out on the ground plane. The symmetrical circuit makes the sensitivity further improved to the introduction of sample to be tested because of the destruction of the symmetry. The complex permittivity of the dielectric samples has been evaluated from the actual experimental scattering parameters by using back propagation neural network techniques. The proposed methodology is validated by fabricating the sensor on Rogers5880 substrate and testing various standard dielectric samples viz. PVC, Glass epoxy, FR4, and Glass in C‐band. The measured complex permittivity of the test specimens is found to be in close agreement with their values available in literature with maximum error of <5%.

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Electromagnetic wave absorption properties of cement-based composites filled with porous materials

Cited by 76 publications

References 20 publications

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

Mechanical and Electrical Characteristics of Lightweight Aggregate Concrete Reinforced with Steel Fibers

Thermal Spray Coatings for Electromagnetic Wave Absorption and Interference Shielding: A Review and Future Challenges

Improved approach using symmetric microstrip sensor for accurate measurement of complex permittivity

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