Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Evaluation on High Altitude Electromagnetic Pulse(HEMP) Protection Performance of Carbon Nanotube(CNT) Embedded Ultra-High Performance Concrete(UHPC)

탄소나노튜브(CNT)를 혼입한 초고성능 콘크리트(UHPC)의 고고도 전자기파(HEMP) 방호성능 평가

  • Jung, Myungjun (Department of Architecture & Architectural Engineering, Seoul National University) ;
  • Hong, Sung-gul (Department of Architecture & Architectural Engineering, Seoul National University)
  • Received : 2018.11.05
  • Accepted : 2019.02.25
  • Published : 2019.04.05
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Abstract

In this study, to evaluate the High Altitude Electromagnetic Pulse(HEMP) protection performance of UHPC/CNT composites by the content of Carbon nanotubes(CNTs), Electromagnetic Shielding Effectiveness(SE) test was performed based on MIL-STD-188-125-1. And the results were verified by applying the Antenna theory. In the case of UHPC with a thickness of 200 mm mixed with 1 % CNT of cement weight, the SE was 28.98 dB at 10 kHz and 45.94 dB at 1 GHz. Then the Scabbing limit thickness for bullet proof was computed based on the result of compressive strength test which was 170 MPa, and it was examined whether it satisfied the HEMP protection criteria. As a result, the required HEMP shielding criteria were satisfied in all frequency ranges as well as the scabbing limit thickness was reduced by up to 43 % compared with that of ordinary concrete.

Keywords

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Fig. 1. Concept of HEMP shielding facilities[3]

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Fig. 2. Mixing process

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Fig. 3. Geometry of specimens: (a) for electrical resistance test; (b) for electromagnetic shielding effectiveness test

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Fig. 4. SE test procedure

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Fig. 5. Conductivity

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Fig. 6. SE test result

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Fig. 7. Comparison between experimental result and numerical calculation

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Fig. 8. Compressive strength

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Fig. 9. Bridging effect of CNT on cracked surface

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Fig. 10. Comparison between HEMP-Std. and Expected SE

Table 1. Scabbing limit thickness for SAP500 bomb by concrete compressive strength

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Table 2. Properties of CNT

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Table 3. Properties of cement and silica fume

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Table 4. Mix proportion

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Table 5. Properties of SAP500

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