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A Study on the Electrical Conductivity and Electromagnetic Shielding of High Performance Fiber Reinforced Cementitious Composites(HPFRCC)

고성능 시멘트 복합체의 전기전도도 및 전자파 특성 시험 평가

Lee, Nam-Kon;Park, Gi-Joon;Park, Jung-Jun;Kim, Sung-Wook
이남곤;박기준;박정준;김성욱

  • Received : 2018.10.16
  • Accepted : 2018.11.28
  • Published : 2019.03.01

Abstract

This study investigated electrical conductivity, electromagnetic shielding effectiveness, and mechanical property to improve electromagnetic shielding performance of high performance fiber reinforced cementitious composites (HPFRCC). Steel fiber, steel slag and carbon black as a conductive material were incorporated into the HPFRCC mixes. In addition, 2% CNT solution which was produced by dispersing multi-wall carbon nanotube (MWCNT) into water was used as a conductive material. In the test results, electrical conductivity of HPFRCC specimens was very low except for the specimen incorporating 1% carbon black. Micro structure of cement matrix was changed as the curing time increased, which negatively affected the conductive network of HPFRCC. In case of HC1 specimen showing a conductive network (0.083 S/cm), the electrical conductivity of the specimen after being dried at $60^{\circ}C$ for 72 hours to exclude the effect of water on electrical conductivity was significantly reduced to 0.0003 S/cm. The most important parameter of electromagnetic shielding effect was found to be a steel fiber while the effect of carbon black and steel slag was very few. The correlation between electrical conductivity and electromagnetic shielding effect does not seem to be clear.

Keywords

Electromagnetic Shielding;Electrical Conductivity;Steel Fiber;HPFRCC

Acknowledgement

Supported by : 국토교통부