AC-impedance response of multi-walled carbon nanotube/cement composites |
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| Affiliation: | 1. Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13453, Marseille, France;2. Univ. Clermont Auvergne, CNRS, Sigma, Institut Pascal, UMR, 6602, Clermont-Ferrand, France;1. Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul, 143-747, South Korea;2. Department of Civil Engineering, Hanoi University of Mining and Geology, Hanoi, Viet Nam;3. Department of Civil, Environmental and Railroad Engineering, PaiChai University, Deajeon, 35345, South Korea;1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, PR China;2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent B-9052, Belgium;3. School of Civil Engineering, National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, PR China;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Transportation and Logistics, Dalian University of Technology, Dalian 116024, China;3. Department of Mechanical Engineering, New York Institute of Technology, New York, NY 11568, USA;4. School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China;5. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | AC-impedance spectroscopy (AC-IS) was combined with time-domain reflectometry (TDR) to investigate the impedance response of fiber-reinforced cement (FRC) composites with multi-walled carbon nanotubes (MWCNTs). In Nyquist plots (−imaginary impedance vs. +real impedance) three impedance arcs/features were observed, similar to Nyquist plots for macrofiber and microfiber FRCs. The intersection of the electrode arc and the intermediate frequency feature (RDC(FRC)) corresponds to the DC resistance of the composite. The intersection of the two bulk features (Rcusp) corresponds to the AC resistance of the composite. Reductions in (RDC(FRC)) from the matrix resistance are indicative of a nanotube percolating network. Reductions in Rcusp from the matrix resistance are indicative of a discontinuous fiber–fiber path. Both shifts increased with fiber loading. AC-IS measurements are therefore able to discriminate percolation vs. discontinuous fiber effects in CNT-FRCs, with the potential for characterizing dispersion issues (e.g., clumping/aggregation) in nanocomposites. |
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