期刊
NANOMATERIALS
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/nano12010074
关键词
multi-scale composites; carbon fibers; cement; carbon nanotubes; stress sensing
类别
资金
- Fibrenamics, Institute of Innovation in Fiber-based Materials and Composites
- University of Minho-Guimaraes, Portugal of 2C2T-Centro de Ciencia e Tecnologia Textil [UID/CTM/00264/2019]
- National Funds through FCT/MCTES
- School of Arts and Humanities, University of Huddersfield and Fibernamics, Institute of Innovation in Fiber-based Materials and Composites
- Fundação para a Ciência e a Tecnologia [UID/CTM/00264/2019] Funding Source: FCT
This study investigates the tensile stress sensing properties of multi-scale cementitious composites containing carbon fibers and carbon nanofibers/multi-walled carbon nanotubes. The multi-scale composites with CNFs and MWCNTs showed good stress sensitivity and a linear correlation between FCR and tensile load/stress.
In this work, multi-scale cementitious composites containing short carbon fibers (CFs) and carbon nanofibers (CNFs)/multi-walled carbon nanotubes (MWCNTs) were studied for their tensile stress sensing properties. CF-based composites were prepared by mixing 0.25, 0.5 and 0.75 wt.% CFs (of cement) with water using magnetic stirring and Pluronic F-127 surfactant and adding the mixture to the cement paste. In multi-scale composites, CNFs/MWCNTs (0.1 and 0.15 wt.% of cement) were dispersed in water using Pluronic F-127 and ultrasonication and CFs were then added before mixing with the cement paste. All composites showed a reversible change in the electrical resistivity with tensile loading; the electrical resistivity increased and decreased with the increase and decrease in the tensile load/stress, respectively. Although CF-based composites showed the highest stress sensitivity among all specimens at 0.25% CF content, the fractional change in resistivity (FCR) did not show a linear correlation with the tensile load/stress. On the contrary, multi-scale composites containing CNFs (0.15% CNFs with 0.75% CFs) and MWCNTs (0.1% MWCNTs with 0.5% CFs) showed good stress sensitivity, along with a linear correlation between FCR and tensile load/stress. Stress sensitivities of 6.36 and 11.82%/MPa were obtained for the best CNF and MWCNT-based multi-scale composite sensors, respectively.
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