Shielding Effectiveness and Impact Resistance of Concrete Walls Strengthened by High-Strength High-Ductility Concrete

Abstract

Following the fourth Industrial Revolution, electronic and data-based technology is becoming increasingly developed. However, current research on enhancing electromagnetic interference (EMI) shielding and the physical protection performance of structures incorporating these technologies is insufficient. Therefore, in this study aiming for the improvement of EMI shielding and structural performance of structures, twelve concrete walls were fabricated and tested to determine their shielding effectiveness and drop-weight impact resistance. Concrete walls strengthened by three thickness types of high-strength, high-ductility concrete (HSDC) have been considered. The test results showed that the shielding effectiveness with strengthening thickness increased by approximately 35.6–46.2%. Specimens strengthened by more than 40% and 10% of the strengthening area ratio of single- and double-layer, respectively, exhibited more than 20 dB of shielding effectiveness. Moreover, the relationship between the damaged area ratio and shielding effectiveness was evaluated by means of the drop-weight impact test. The structural performance and EMI shielding effectiveness improved as the HSDC thickness increased.

Effect of bismuth oxide nanoparticle on the electromagnetic interference shielding and thermal stability of industrial waste based-geopolymer composites

“…It is evident that GP-3 (with 5% BiNP) is comparable and even outperformed other GP and cement composites when sample thickness is considered. Furthermore, despite the insufficient evidence of BiNP as high EMI SE material, GP-3 possessed 20 × the attenuating properties compared to normal concrete 5 and 2 × to the stainless-steel dust-added cement 13 . These results indicated that 5% of BiNP used as additive filler to GP is a competitive structural material with significant EMI-SE properties.…”

“…EMR source signal has also caused issues in various industries, such as the aviation and medical sector. It also triggered malfunctions and deterioration of electronic devices and could be used as military weapons (EM pulse) to neutralize networks of an enemy [3][4][5] . Due to this, research with regard to fabricating materials with significant EM shielding properties is required to reduce potential human exposure to EM radiation and protect sensitive electronic devices.Most studies directed into EMI shielding material are aimed at lightweight materials such as coating and thin panels, usually fabricated based on foams and polymers containing carbon-based materials and conductive and magnetic absorbers.…”

“…EMR source signal has also caused issues in various industries, such as the aviation and medical sector. It also triggered malfunctions and deterioration of electronic devices and could be used as military weapons (EM pulse) to neutralize networks of an enemy [3][4][5] . Due to this, research with regard to fabricating materials with significant EM shielding properties is required to reduce potential human exposure to EM radiation and protect sensitive electronic devices.…”

Shielding Effectiveness of Concrete Reinforced with Steel Fibers: Influence of Fiber Length and Aspect Ratio

“…Fiber-reinforced concrete (FRC) exhibits a good attenuation in the high-frequency range (Guan et al, 2006;Chung, 2000;Wen and Chung, 2004). Observing that wire meshes provide excellent attenuation at low-frequencies (Quintana et al, 2018;Yuan et al, 2021;Lee et al, 2021;Krause et al, 2012;Nguyen et al, 2017), two french companies, namely: Spie batignolles génie civil and EuroMC have recently patented GreyShield ® (Caron-Fellens and Mardiguian, 2017). It provides electromagnetic shielding through the combination of FRC walls and wire meshes that are placed on the external surface.…”

“…Different kinds of cement-based shielding are thus obtained: with or without metallic grid (Yuan et al, 2021;Lee et al, 2021;Yuan et al, 2022), fibers or powders (Guan et al, 2006;Cao and Chung, 2003); effect of rebars is analyzed (Yuan et al, 2021); and alternatives to steel additives are tested: carbon (Chung, 2000(Chung, , 2001Jung et al, 2020), taconite (Krause et al, 2012;Nguyen et al, 2017), ferrite (Stefaniuk et al, 2022).…”