Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-09-01

Journal: CONSTRUCTION AND BUILDING MATERIALS

Included Journals: EI、SCIE

Volume: 46

Page Number: 98-103

ISSN: 0950-0618

Key Words: Multi-walled carbon nanotubes; Cement composites; Wave absorption; Reflectivity

Abstract: 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.