국외전문학술

Lee, S., Kim, G., Kim, H., Son, M., Lee, Y., Choi, Y., Woo, J., & Nam, J. (2021). Electromagnetic wave shielding properties of amorphous metallic fiber-reinforced high-strength concrete using waveguides. Meterials, 14(22), 7052
Lee, S., Kim, G., Kim, H., Son, M., Lee, Y., Choi, Y., Woo, J., & Nam, J. (2021). Electromagnetic wave shielding properties of amorphous metallic fiber-reinforced high-strength concrete using waveguides. Meterials, 14(22), 7052
작성자 건설재료시공학연구실
조회수 86 등록일 2022.03.23
주저자 Sangkyu Lee
교신저자
공동저자 Gyuyong Kim, Hongseop Kim, Minjae Son, Yaechan Lee, Yoonseon Choi, Jongmyung Woo, Jeongsoo Nam
학술지명 Meterials
In this study, high-strength concrete containing hooked-end steel or amorphous metallic fibers was fabricated, and the electrical conductivity and electromagnetic shielding effectiveness were evaluated after 28 and 208 days based on considerations of the influences of the moisture content. Amorphous metallic fibers, which have the same length and length/equivalent diameter ratio as hooked-end steel fibers, were favored for the formation of a conductive network because they can be added in large quantities owing to their low densities. These fibers have a large specific surface area as thin plates. The electromagnetic shielding effectiveness clearly improved as the electrical conductivity increased, and it can be expected that the shielding effectiveness will approach the saturation level when the fiber volume fraction of amorphous metallic fibers exceeds 0.5 vol.%. Meanwhile, it is necessary to reduce the amount of moisture to conservatively evaluate the electromagnetic shielding performance. In particular, when 0.5 vol.% of amorphous metallic fibers was added, a shielding effectiveness of >80 dB (based on a thickness of 300 mm) was achieved at a low moisture content after 208 days. Similar to the electrical conductivity, excellent shielding effectiveness can be expected from amorphous metallic fibers at low contents compared to that provided by hooked-end steel fibers.



 https://doi.org/10.3390/ma14227052