Synthesis,characterisation and performance of piezo-resistive cementitious nanocomposites |
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| Affiliation: | 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;1. Department of Civil Engineering, Democritus University of Thrace, Xanthi, Greece;2. Glonatech S.A. TE.S.P.A “Lefkippos” Ag. Paraskevi, GR-15341, Attica, Greece;1. Department of Civil Engineering, M. S. Ramaiah Institute of Technology, Bangalore 560 054, India;2. Department of Chemistry, M. S. Ramaiah Institute of Technology, Bangalore 560 054, India;1. Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey;2. Department of Building and Construction Engineering, University of Technology, Baghdad, Iraq;3. Department of Civil Engineering, Adana Science and Technology University, Adana, Turkey;4. Department of Civil Engineering, Selçuk University, Konya, Turkey;5. Department of Civil Engineering, Gazi University, Ankara, Turkey;1. Assistant Professor, Department of Civil Engineering, University of Guilan, Rasht, Iran;2. Department of Civil Engineering, University of Guilan, Rasht, Iran;1. Department of Continuum Mechanics and Structural Analysis, School of Engineering, University of Seville, Camino de los Descubrimientos s/n, E-41092 Seville, Spain;2. Department of Civil, Construction, and Environmental Engineering, Iowa State University, 394 Town Engineering, Ames, IA 50011, United States;3. Department of Civil and Environmental Engineering, University of Perugia, Via G Duranti 93, Perugia 06125, Italy;4. Department of Mechanics, University of Cordoba, Campus de Rabanales, Cordoba CP 14071, Spain |
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| Abstract: | Smart material reinforced non-destructive structural health monitoring technique has been evolving as the most predominated route for assessing the performance of the civil structures. In the present study, multiwalled nanotubes (MWNT) were suitably incorporated into the cement matrix, which act as actively embedded sensor for monitoring real-time flaws in structures. Initially, the stable homogenous MWNT dispersion was prepared by using ionic surfactant technique with high-intensity ultrasonic agitation process. Since, a suitable and adequate synthesis procedure to incorporate MWNT in cement matrix is essential, but complicated, the role of amplitude and frequency of sonication on dispersion of nanotubes was categorically evaluated. Further, this paper focuses to find out the effect of surfactant on MWNT dispersion by using the UV Visible spectroscopy and by evaluating the effective hydro-dynamic diameter. Based on micromechanics based analytical model, the influence of the interface layer thickness and geometrical configuration of nanotubes on the electrical conductivity of cement nano-composite are also analyzed. Further, the electrical conductivity of MWNT incorporated cement system, as developed in the present study, is measured using four probe method. Piezo-resistivity of the oven dried samples is measured to evaluate the change in potential drop under cyclic loading regime. It is found that the efficiency of the piezo-resistive strain sensors greatly depends on synthesis process and the circuit system. Appropriately proportioned and properly synthesized MWNTs incorporated in cement matrix were capable of providing consistent and steady response under the variable external stress. Thus, the material can be used as embedded sensor for health monitoring and identifying initiation of any damage in reinforced concrete structure. |
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| Keywords: | Multi walled carbon nanotubes (MWNTs) Surfactant Dispersion Cyclic loading Piezo-resistivity Conductance Nano-composite |
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