Self sensing carbon nanotube (CNT) and nanofiber (CNF) cementitious composites for real time damage assessment in smart structures |
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| Affiliation: | 1. School of Architecture, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 501-759, South Korea;2. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Mechanical & Energy Engineering, University of North Texas, Denton, TX 76203, USA;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 and Environmental Engineering, University of Perugia, Via G Duranti 93, Perugia 06125, Italy;3. Department of Mechanics, University of Cordoba, Campus de Rabanales, Cordoba, CP 14071, Spain;4. Department of R&D, Construcciones AZVI, Seville, Spain;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 |
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| Abstract: | The self sensing properties of cementitious composites reinforced with well dispersed carbon nanotubes and carbon nanofibers were investigated. The electrical resistance of cementitious nanocomposites with w/c = 0.3 reinforced with well dispersed carbon nanotubes (CNTs) and nanofibers (CNFs) at an amount of 0.1 wt% and 0.3 wt% of cement was experimentally determined and compared with resistivity results of nanocomposites fabricated with “as received” nanoscale fibers at the same loading. Results indicate that conductivity measurements, besides being a valuable tool in evaluating the smart properties of the nanocomposites, may provide a good correlation between the resistivity values measured and the degree of dispersion of the material in the matrix. The addition of CNTs and CNFs at different loadings was proven to induce a decrease in electrical resistance, with the nanocomposites containing 0.1 wt% CNTs yielding better electrical properties. Furthermore, conductivity measurements under cyclic compressive loading provided an insight in the piezoresistive properties of selected nanocomposites. Results confirm that nanocomposites, reinforced with 0.1 wt% CNTs and CNFs, exhibited an increased change in resistivity, which is indicative of the amplified sensitivity of the material in strain sensing. |
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| Keywords: | Resistivity Piezoresistivity Strain sensing Carbon nanotubes cementitious composites |
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