Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6695039 | Archives of Civil and Mechanical Engineering | 2017 | 11 Pages |
Abstract
In this paper, electrostatic self-assembled carbon nanotube (CNT)/nanocarbon black (NCB) composite is employed as filler for developing multifunctional cement-based composites. The performances of the composites with different content of filler are investigated. The electrochemical impedance spectroscopy and equivalent circuit are used to explore the conductive and mechanical mechanisms of the composites. Experimental results indicate that the compressive strength and elasticity modulus of the composites sharply decrease when the filler content exceeds 0.77Â vol.%. The percolation threshold zone of the electrical conductivity of the composites ranges from 0.39Â vol.% to 1.52Â vol.%. The piezoresistive properties of the composites with 2.40Â vol.% filler are stable and sensitive, and the maximum fractional change of electrical resistivity is 25.4% when the stress amplitude is 10Â MPa. The composites feature sensitive and linear thermal resistance effect when the filler content is 0.77Â vol.%. Electromagnetic shielding effectiveness of the composites with 2.40Â vol.% filler at 18Â GHz is 5.0Â dB, which is 2.2 times of that of the control samples. The composites exhibit high absorbing electromagnetic wave performances in the frequency range of 2-18Â GHz, and the minimum reflectivity reaches â23.08Â dB with 0.77Â vol.% filler.
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Authors
Liqing Zhang, Baoguo Han, Jian Ouyang, Xun Yu, Shengwei Sun, Jinping Ou,