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论文类型：期刊论文

发表时间：2017-02-01

发表刊物：ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING

收录刊物：SCIE、EI

卷号：17

期号：2

页面范围：354-364

ISSN号：1644-9665

关键字：CNT/NCB composite filler; Electrical resistivity; Piezoresistivity; Thermal-resistance effect; Electromagnetic property

摘要：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 0.77 vol.%. The percolation threshold zone of the electrical conductivity of the composites ranges from 0.39 vol.% to 1.52 vol.%. The piezoresistive properties of the composites with 2.40 vol.% filler are stable and sensitive, and the maximum fractional change of electrical resistivity is 25.4% when the stress amplitude is 10 MPa. The composites feature sensitive and linear thermal resistance effect when the filler content is 0.77 vol.%. Electromagnetic shielding effectiveness of the composites with 2.40 vol.% filler at 18 GHz is 5.0 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 2-18 GHz, and the minimum reflectivity reaches -23.08 dB with 0.77 vol.% filler. (C) 2016 Politechnika Wroclawska. Published by Elsevier Sp. z o.o. All rights reserved.