Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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An Experimental Study to Secure Electromagnetic Pulse Shielding Performance of Concrete Coated by an Arc Metal Spraying Process

아크 금속 용사 공법에 의해 코팅된 콘크리트의 전자기파 차폐 성능 확보를 위한 실험적 연구

  • Jang, Jong-Min (Department of Smart-city Engineering, Hanyang University) ;
  • Jeong, Hwa-Rang (Department of Architectural Engineering, Daegu Catholic University) ;
  • Lee, Han-Seung (Department of Architectural Engineering, Hanyang University)
  • Received : 2021.10.22
  • Accepted : 2021.11.09
  • Published : 2021.12.20
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Abstract

In this study, an electromagnetic pulse shielding effect was obtained by applying the arc metal spraying method to the ordinary concrete. For this study, to evaluate the electrical properties in the thickness of the metal sprayed coating, 8 types of metals(Cu, CuAl, CuNi, CuZn, Al, Zn, ZnAl, AlMg) were sprayed as coatings with a thickness of 100, 200 and 500㎛. The electrical conductivity on the surface was measured with a 4-pin probe, and an electromagnetic wave shielding effect test was performed according to KS. Based on the test results, 200 ㎛ was proposed as an optimal metal coating thickness for electromagnetic pulse shielding, and it was thermally sprayed on a 300×300×100mm concrete specimen to analyze the electromagnetic wave shielding performance. However, in the area of adhesion strength, the maximum was 1.11MPa, which was found to be less than 74% of the target performance.

본 연구에서는 기존의 전자기파 차폐 성능이 없는 콘크리트를 대상으로 아크 금속용사 공법을 적용하여 전자기파 차폐성능을 확보하고자 한다. 이를 위해 금속 코팅의 두께에 전기적 특성을 평가하기 위해서 8 종류의(Cu, CuAl, CuNi, CuZn, Al, Zn, ZnAl, AlMg) 금속들을 두께 100, 200 및 500㎛의 금속 코팅으로 제작하여 4pin-probe로 표면에서의 전기전도도를 측정하였고, KS C 0304에 의거하여 전자기파 차폐 성능 시험을 실시하였다. 금속 코팅 시험 결과를 토대로 전자기파 차폐를 위한 최적의 금속 코팅 두께 200㎛를 제안하였으며, 이를 300×300×100mm 콘크리트 시험체에 용사하여 전자기파 차폐 성능을 분석한 결과 목표 성능 1GHz에서 80dB의 전자기파 차폐 성능이 확보됨을 확인하였다. 하지만 부착 강도의 경우 최대 1.11MPa로 목표 성능 대비 74% 이하로 확인되어 추후 콘크리트 표면에 미세한 요철을 형성하여 부착 성능을 향상시키는 연구가 필요할 것으로 판단된다.

Keywords

Acknowledgement

This research was supported by a grant(20S CIP-B146646-03) from Construction Technology Research Project funded by the Ministry of Land, Infrastructure and Transport of Korea government.

References

  1. Broad WJ. Nuclear pulse (I): Awakening to the chaos factor. Science. 1981 May;212(4498):1009-12. https://doi.org/10.1126/science.212.4498.1009
  2. Wilson C. High altitude electromagnetic pulse (HEMP) and high power microwave (HPM) devices: Threat assessments. Library of Congress Washington DC Congressional Research Service; 2008. p. 1-19.
  3. Lee WJ, Lee H, Kim YJ. Literature review on material development and performance evaluation method for EMP shielding concrete. Journal of the Korea Academia-Industrial Cooperation Society. 2020 Dec;21(12):67-76. https://doi.org/10.5762/KAIS.2020.21.12.67
  4. Chung DDL. Materials for electromagnetic interference shielding. Materials Chemistry and Physics. 2020 Nov;255:123587. https://doi.org/10.1016/j.matchemphys.2020.123587
  5. MIL-STD-188-125-1. High-altitude electromagnetic pulse (HEMP) protection for ground-based C41 facilities performing critical, time-urgent missions - part 1 fixed facilities. USA: Department of Defense Interface Standard; 1998. p. 1-96.
  6. Jeong YC, Yuk JG. Design and construction of high-power electromagnetic pulse protection facilities. The Proceeding of the Korean Institute of Electromagnetic Engineering and Science. 2021 Jul;23(4):3-15.
  7. Choi HJ, Park JH, Min TB, Jang HO, Lee HS. An experimental study on the evaluation of EMP shielding performance of concrete applied with ATMSM using Zn-Al alloy wire. Journal of the Korea Institute of Building Construction; 2019 Jun; 19(3):209-17. https://doi.org/10.5345/JKIBC.2019.19.3.209
  8. Gonzalez M, Mokry G, Nicolas M, Baselga J, Pozuelo J. Carbon nanotube composites as electromagnetic shielding materials in GHz range. London: Carbon Nanotubes chapter 11; 2016. p. 297-321. https://doi.org/10.5772/62508
  9. Jung M, Hong SG. Evaluation on high altitude electromagnetic pulse (HEMP) protection performance of carbon nanotube (CNT) embedded ultra-high performance concrete (UHPC). Journal of the Korea Institute of Military Science and Technology. 2019 Apr;22(2):151-61. https://doi.org/10.9766/KIMST.2019.22.2.151
  10. Lee NK, Park GJ, Park JJ, Kim SW. A study on the electrical conductivity and electromagnetic shielding of high performance fiber reinforced cementitious composites (HPFRCC). Journal of the Korea Institute for Structural Maintenance and Inspection. 2019 Mar;23(2):37-43. https://doi.org/10.11112/jksmi.2019.23.2.37
  11. Lee HS, Park JH, Sing JK, Choi HJ, Mandal S, Jang JM, Yang HM. Electromagnetic shielding performance of carbon black mixed concrete with Zn-Al metal thermal spray coating. Materials. 2020 Feb;13(4):1-16. https://doi.org/10.3390/ma13040895
  12. Jang JM, Lee HS, Sign JK. Electromagnetic shielding performance of different metallic coatings deposited by arc thermal spray process. Materials. 2020 Dec;13(24):1-15. https://doi.org/10.3390/ma13245776