The Effects of Multi-Walled Carbon Nanotubes and Steel Fibers on the AC Impedance and Electromagnetic Shielding Effectiveness of High-Performance, Fiber-Reinforced Cementitious Composites

被引:17
作者
Lee, Namkon [1 ]
Kim, Sungwook [1 ]
Park, Gijoon [1 ]
机构
[1] Korea Inst Civil Engn & Bldg Technol, Struct Engn Res Div, 283 Goyangdae Ro, Goyang Si 10223, Gyeonggi Do, South Korea
关键词
MWCNTs; AC impedance; electromagnetic shielding; HPFRCC; steel fiber; EQUIVALENT-CIRCUIT MODEL; ELECTRICAL-PROPERTIES; SPECTROSCOPY; SILICA; CONDUCTIVITY; SPECTRA;
D O I
10.3390/ma12213591
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study aimed to investigate the effect of multi-walled carbon nanotubes (MWCNTs) and steel fibers on the AC impedance and electromagnetic shielding effectiveness (SE) of a high-performance, fiber-reinforced cementitious composite (HPFRCC). The electrical conductivity of the 100 MPa HPFRCC with 0.30% MWCNT was 0.093 S/cm and that of the 180 MPa HPFRCC with 0.4% MWCNT and 2.0% steel fiber was 0.10 S/cm. At 2.0% steel fiber and 0.3% MWCNT contents, the electromagnetic SE values of the HPFRCC were 45.8 dB (horizontal) and 42.1 dB (vertical), which are slightly higher than that (37.9 dB (horizontal)) of 2.0% steel fiber content and that (39.2 dB (horizontal)) of 0.3% MWCNT content. The incorporation of steel fibers did not result in any electrical percolation path in the HPFRCC at the micro level; therefore, a high electrical conductivity could not be achieved. At the macro level, the proper dispersion of the steel fibers into the HPFRCC helped reflect and absorb the electromagnetic waves, increasing the electromagnetic SE. The incorporation of steel fibers helped improve the electromagnetic SE regardless of the formation of percolation paths, whereas the incorporation of MWCNTs helped improve the electromagnetic SE only when percolation paths were formed in the cement matrix.
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页数:25
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共 25 条
  • [1] Electrical resistivity measurements in steel fibre reinforced cementitious materials
    Berrocal, Carlos G.
    Hornbostel, Karla
    Geiker, Mette R.
    Lofgren, Ingemar
    Lundgren, Karin
    Bekas, Dimitrios G.
    [J]. CEMENT & CONCRETE COMPOSITES, 2018, 89 : 216 - 229
  • [2] Colloidal graphite as an admixture in cement and as a coating on cement for electromagnetic interference shielding
    Cao, JY
    Chung, DDL
    [J]. CEMENT AND CONCRETE RESEARCH, 2003, 33 (11) : 1737 - 1740
  • [3] Assignment of features in impedance spectra of the cement-paste/steel system
    Ford, SJ
    Shane, JD
    Mason, TO
    [J]. CEMENT AND CONCRETE RESEARCH, 1998, 28 (12) : 1737 - 1751
  • [4] AC IMPEDANCE SPECTROSCOPY .1. A NEW EQUIVALENT-CIRCUIT MODEL FOR HYDRATED PORTLAND-CEMENT PASTE
    GU, P
    XIE, P
    BEAUDOIN, JJ
    BROUSSEAU, R
    [J]. CEMENT AND CONCRETE RESEARCH, 1992, 22 (05) : 833 - 840
  • [5] Cement based electromagnetic shielding and absorbing building materials
    Guan, Hongtao
    Liu, Shunhua
    Duan, Yuping
    Cheng, Ji
    [J]. CEMENT & CONCRETE COMPOSITES, 2006, 28 (05) : 468 - 474
  • [6] Intrinsic conductivity of short conductive fibers in composites by impedance spectroscopy
    Hixson, AD
    Woo, LY
    Campo, MA
    Mason, TO
    Garboczi, EJ
    [J]. JOURNAL OF ELECTROCERAMICS, 2001, 7 (03) : 189 - 195
  • [7] A review on microstructural characterization of cement-based materials by AC impedance spectroscopy
    Hu, Xiang
    Shi, Caijun
    Liu, Xiaojin
    Zhang, Jiake
    de Schutter, Geert
    [J]. CEMENT & CONCRETE COMPOSITES, 2019, 100 : 1 - 14
  • [8] Experiments and micromechanical modeling of electrical conductivity of carbon nanotube/cement composites with moisture
    Jang, Sung-Hwan
    Hochstein, Daniel Peter
    Kawashima, Shiho
    Yin, Huiming
    [J]. CEMENT & CONCRETE COMPOSITES, 2017, 77 : 49 - 59
  • [9] Impedance measurements on cement paste
    Keddam, M
    Takenouti, H
    Novoa, XR
    Andrade, C
    Alonso, C
    [J]. CEMENT AND CONCRETE RESEARCH, 1997, 27 (08) : 1191 - 1201
  • [10] Improved piezoresistive sensitivity and stability of CNT/cement mortar composites with low water-binder ratio
    Kim, H. K.
    Park, I. S.
    Lee, H. K.
    [J]. COMPOSITE STRUCTURES, 2014, 116 : 713 - 719