Experiments and micromechanical modeling of electrical conductivity of carbon nanotube/cement composites with moisture |
| |
| Affiliation: | 1. Department of Civil Engineering and Engineering Mechanics, Columbia University, 610 Seeley W. Mudd 500 West 120th Street, New York, NY 10027, USA;2. Robotics Institute, School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213, USA;3. Department of Civil and Environmental Engineering, Manhattan College, 4513 Manhattan College Parkway, Riverdale, NY 10471, 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, 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;1. College of Civil Engineering, Tongji University, Shanghai 201620, China;2. Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences, Shanghai 200032, China;3. School of Computing, Engineering and Mathematics, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;4. School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2007, Australia |
| |
| Abstract: | Carbon nanotube (CNT)/cement composites have been proposed as a multifunctional material for self-sensing and traffic monitoring due to their unique electric conductivity which changes with the application of mechanical load. However, material constituent and environmental factors may significantly affect the potential application of these materials. Therefore, it is necessary to understand an influence of material constituent such as porosity and dispersion of CNT and environmental factor such as moisture on the electrical conductivity of CNT/cement composite. This paper investigates the effect of moisture on the effective electrical conductivity of CNT/cement composites. To prepare the specimens, multi-walled carbon nanotubes (MWCNTs) are well dispersed in cement paste, which is then molded and cured into cubic test specimens. By drying the specimens from the fully saturated state to the fully dry state, the effective electrical conductivity is measured at different moisture contents. As the water in the specimen is replaced by air voids, the electrical conductivity significantly decreases. Different ratios of MWCNTs to cement have been used in this study. Micromechanical models have been used to predict the effective electrical conductivities. A comprehensive model is proposed to take into account the effects of individual material phases on the effective electrical conductivity of CNT/cement composites with moisture effect. |
| |
| Keywords: | Electrical conductivity Cement paste Multi-walled carbon nanotubes Moisture Micromechanical model |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
