Evaluation of Electromagnetic Pulse Shielding Performance of Carbon Fiber-Mixed Cement Paste

Abstract

This study investigated the physical properties and electromagnetic pulse (EMP) shielding performance of cement paste containing small-diameter carbon fibers to develop an EMP-shielding cement. Small-diameter carbon fibers were used as a cement admixture because the powders were approximately 100 μm in length and were visually powder-shaped. As a result of the experiment, it was indicated that ordinary Portland cement do not have shielding performance. However, cement paste with 5% carbon fibers showed effectiveness in compressive strength and EMP shielding. However, the shielding performance did not increase when the cement contained more than 5% carbon fibers. Furthermore, a review of the EMP shielding performance relative to the thickness of the specimen showed that the plain cement without small-diameter carbon fibers did not increase the shielding performance with an increase in thickness, but the shielding performance of the specimens with small-diameter carbon fibers increased with an increase in thickness. Therefore, it was more effective to increase the thickness of the cement containing 5% carbon fibers rather than increasing the carbon fiber content.

Development and Experimental Verification of Inorganic Electromagnetic Pulse Shielding Paint for Building Interiors Using Carbon-Based Materials

“…They found that electric arc furnace oxidizing and copper slag have positive effects on the shielding effectiveness. Min and Cho (2022) [26] evaluated the shielding effectiveness of EMP shielding concrete at various levels of milled carbon content. It was reported that the greatest improvement in shielding effectiveness occurred when the milled carbon content was 5%, and the shielding effectiveness increased at increasing concrete thickness [26].…”

“…EMP shielding methods can be classified into two categories: those that utilize metallic materials and those that utilize carbon-based materials [ 11 , 12 , 13 , 14 , 15 ]. The objective of this study is to develop an EMP shielding inorganic paint.…”

“…A review of previous research on EMP shielding technology and materials indicated that there is still insufficient research on the development of EMP shielding paints for buildings [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Using EMP shielding concrete alone has limitations in shielding the entire structure, and the use of metal coating technology for the interior of buildings requires special equipment and high temperatures, making it more challenging than painting in terms of pretreatment and construction methods [ 22 , 23 , 24 , 25 , 26 ]. This study aimed to develop an EMP shielding inorganic paint applicable to buildings and to derive the optimal mixture based on various mixture experiments.…”

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

“…However, this increases the construction cost, while the space and construction efficiency decrease when a new room is added to the existing concrete structure. Moreover, the corrosion of welds or joints produces oxides that reduce the shielding efficacy [ 13 , 14 ].…”

“…At 1 GHz, materials with high electrical conductivity, such as carbon black, carbon nanotubes, and steel fibers, can be incorporated into concrete to improve the shielding effect of the concrete structure [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. However, the mass production of these materials is high-cost and their economic efficiency is low.…”