Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 208, Issue -, Pages 427-443Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.03.029
Keywords
Carbon nanotubes; Cementitious composites; Electromagnetic wave absorption; Electromagnetic wave shielding; Mechanisms
Categories
Funding
- National Science Foundation of China [51578110]
- Fundamental Research Funds for the Central Universities in China [DUT18GJ203]
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The effects of different types and contents of multiwalled carbon nanotubes (MWCNTs) on the electromagnetic wave absorption and shielding properties of cementitious composites as well as their mechanisms were investigated in this paper. Experimental results show that the electromagnetic properties of cementitious composites are improved with the increase of MWCNTs content and size. Besides, MWCNTs is more effective in enhancing the electromagnetic wave absorption performance of cementitious composites. The cementitious composite containing 0.8% of carboxylated MWCNTs with larger tube diameter achieves the best electromagnetic wave absorption property with a minimum reflectivity of 36 dB, which is 4.3 times that of cementitious composites without MWCNTs. The incorporation of 0.8% untreated MWCNTs with larger tube diameter and tube length endows cementitious composites a maximum electromagnetic wave shielding effectiveness of 3.3 dB, which is 27% higher than that of control samples. The electromagnetic wave absorption properties of cementitious composites with MWCNTs are dominated by dielectric loss rather than magnetic loss, and the electromagnetic wave shielding properties are dominated by reflection. (C) 2019 Elsevier Ltd. All rights reserved.
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