Influence of carbon fiber on the electromagnetic shielding effectiveness of high-performance fiber-reinforced cementitious composites

Park, Gi-Joon; Kim, Sung-Wook; Park, Gang-Kyu; Lee, Namkon

doi:10.1016/j.jobe.2020.101982

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…The introduction of CF not only enhances the mechanical properties of cement-based composites but also imparts remarkable electrical conductivity to these materials, even with minimal CF content. Moreover, the cost-effectiveness of CF renders them a viable choice as conductive llers, thereby expanding their potential utility within civil engineering applications [15].…”

Section: Introductionmentioning

confidence: 99%

Absorption-dominant electromagnetic interference (EMI) shielding cement with hollow glass microsphere (HGM) at elevated temperatures

Jang,

Bang

et al. 2024

Preprint

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The rapid evolution and expansion of digital infrastructures has underscored the significance of electromagnetic interference (EMI) shielding composites. However, there has been a notable dearth of efforts to explore EMI shielding performance in the context of elevated temperatures. This study introduces hollow glass microspheres (HGM) to enhance the EMI shielding performance of carbon fiber (CF)-embedded conductive cement under elevated temperatures. Experimental outcomes delineate the impact of HGM inclusion on compressive strength, electrical and thermal conductivities, and EMI shielding performance. HGM incorporation is observed to reduce thermal conductivity, consequently improving EMI shielding performance at elevated temperatures by decreasing reflection and increasing absorption properties. The investigation incorporates comprehensive analyses, including XRD, TG, MIP, and micro-CT, to systematically examine the EMI shielding test outcomes at elevated temperatures. In conclusion, the utilization of HGM has the potential to yield super lightweight EMI shielding composites with enhanced EMI shielding performance at elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Absorption-dominant electromagnetic interference (EMI) shielding cement with hollow glass microsphere (HGM) at elevated temperatures

Jang,

Bang

et al. 2024

Preprint

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“…The concrete used in buildings has an extremely high electrical resistivity of 10 6 –10 9 Ω·m [ 5 , 6 ], rendering it vulnerable to EMP [ 7 , 8 ]. To minimize EMP damage, materials with low electrical resistivity, such as copper (1.7 × 10 −8 Ω·m), are employed in concrete buildings [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, the mass production of these materials is high-cost and their economic efficiency is low. Furthermore, their addition to concrete requires a water-reducing agent or an increase in the unit quantity of the materials to ensure workability, which reduces economic efficiency and the strength of the concrete, respectively [ 10 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Treatment Conditions on the Bonding Strength and Electromagnetic Pulse Shielding of Concrete Using the 85Zn-15Al Arc Thermal Metal Spraying Method

Jang

Lee

et al. 2023

Materials

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The surface treatment of concrete enhances the bonding of its metal coatings. Therefore, in the present study, on the concrete surface, prior to the deposit of an 85Zn-15Al coating via an arc thermal spraying process, different surface treatments were considered for the effective electromagnetic pulse (EMP) shielding properties of the concrete. However, the direct coating on a concrete surface possesses lower bond adhesion, therefore it is of the utmost importance to treat the concrete surface prior to the deposition of the metal coating. Moreover, to obtain better bond adhesion and fill the defects of the coating, the concrete surface is treated by applying a surface hardener (SH), as well as a surface roughening agent (SRA) and a sealing agent (SA), respectively. The metal spraying efficiency, adhesion performance, and bonding strength under different concrete surface treatment conditions were evaluated. The EMP shielding effect was evaluated under the optimal surface treatment condition. The proposed method for EMP shielding exhibited over 60% of spraying efficiency on the treated surface and a bonding strength of up to 3.9 MPa for the SH–SRA–SA (combining surface roughening and pores/defects filling agents) specimen compared to the control one, i.e., 0.8 MPa. The EMP shielding values of the surface-treated concrete with surface hardener, surface roughening agent, and sealing agent, i.e., SH–SRA–SA specimens, exhibited 96.6 dB at 1000 MHz. This was about 12 times higher than without coated concrete.

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“…With the rapid advancement of electrical devices and telecommunications technology, the importance of electromagnetic interference (EMI) shielding has increased [ 1 , 2 , 3 ]. Since the undesirable EM wave can cause harmful effects on nearby electronics, it is highly required to develop EMI shielding composites to mitigate the harmful effects [ 1 , 2 , 3 ]. For these reasons, the developments of EMI shielding composites have been proposed by many researchers [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study on EMI Shielding Performance of Carbon Nanomaterials-Embedded CFRP or GFRP Composites

2022

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The rapid advancement of electrical and telecommunication facilities has resulted in increasing requirements for the development of electromagnetic interference (EMI) shielding composites. Accordingly, an experimental study was conducted to evaluate the EMI shielding performance of carbon nanomaterial (CNM)-embedded carbon-fiber-reinforced polymer (CFRP) or glass-fiber-reinforced polymer (GFRP) composites. Nine combinations of CNMs and carbon or glass fibers were used to fabricate the composites. The synergistic effects of CNMs on the EMI shielding performance were systematically investigated. The results indicated that plate-type CNMs (i.e., graphene and graphite nanoplatelets) have more prominent effects than fiber-type CNMs (carbon nanofibers). The composites fabricated with CFRP afforded higher EMI shielding than the GFRP-based composites. Among the eighteen samples, 3% CNT-GNP in CFRP composites, which included plate-typed CNM, exhibited the best EMI shielding performances, showing 38.6 dB at 0.7 GHz. This study helps understand the shielding performance of CNM-embedded CFRP and GFRP composites in electrical and telecommunication facilities.

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Influence of carbon fiber on the electromagnetic shielding effectiveness of high-performance fiber-reinforced cementitious composites

Cited by 16 publications

References 29 publications

Absorption-dominant electromagnetic interference (EMI) shielding cement with hollow glass microsphere (HGM) at elevated temperatures

Absorption-dominant electromagnetic interference (EMI) shielding cement with hollow glass microsphere (HGM) at elevated temperatures

Effects of Surface Treatment Conditions on the Bonding Strength and Electromagnetic Pulse Shielding of Concrete Using the 85Zn-15Al Arc Thermal Metal Spraying Method

A Comprehensive Study on EMI Shielding Performance of Carbon Nanomaterials-Embedded CFRP or GFRP Composites

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