Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 46, Issue -, Pages 98-103Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.04.006
Keywords
Multi-walled carbon nanotubes; Cement composites; Wave absorption; Reflectivity
Categories
Funding
- National Natural Science Foundation of China [51278086]
- Program for New Century Excellent Talents in University of China [NCET-12-0084]
- Costal and Offshore Engineering State Key Laboratory Open Fund [LP1109]
- State Key Laboratory Open Fund of Building Safety and Environment [201202]
- Liaoning BaiQianWan Talents Program [2012921073]
- Science and Technology Projects of Dalian City [2012A13GX024]
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The electromagnetic wave absorbing properties of multi-walled carbon nanotube (MWCNT)/cement composites were studied. The influence of the MWCNT content and sample thickness on the electromagnetic wave reflectivity was discussed and analyzed in the frequency ranges of 2-8 GHz and 8-18 GHz. When the MWCNT content is 0.6 wt.%, the cement mortar sample with a thickness of 25 mm can remarkably absorb electromagnetic waves close to the absorbing peaks in the frequency range of 2-8 GHz. The strongest peak with a reflectivity of -28 dB is obtained at 2.9 GHz. The cement mortar sample with a thickness of 35 mm presents beneficial broadband wave absorption performance between 8 and 18 GHz. The addition of 0.9 wt.% MWCNTs can notably enhance the wave absorption performance of the cement mortar and make the bandwidth below -10 dB reach 7.1 GHz in the frequency range of 8-18 GHz. (C) 2013 Elsevier Ltd. All rights reserved.
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