Abstract
Ordinary Portland cement (OPC)-based self-sensing smart sensors can be affected by exposure to elevated temperatures, which can negatively affect their mechanical strength, electrical resistivity, piezoresistivity, stress/strain sensitivity, and reversibility. Therefore, this study aimed to investigate the mechanical properties, electrical resistivity, and piezoresistive characteristics of calcium aluminate cement (CAC)-based multiwalled carbon nanotube (MWCNT)/nano carbon black (NCB) conductive composite sensors with different concentrations at normal temperature and after exposure to 200 °C and 400 °C. The results indicate that the CAC-based MWCNT/NCB composite fillers exhibit good mechanical properties, low electrical resistivity, and fully reversible piezoresistive sensing properties at both normal and elevated temperatures. The elevated temperature treatments led to a more extensive sudden increase in piezoresistivity. Moreover, CNCB2 with higher concentrations achieved peak compressive strength and fractional changes in electrical resistivity (FCR) sensitivity at 200 °C. Therefore, this study provides a new understanding and pathway for developing CAC-based MWCNT/NCB smart sensors for structural health monitoring (SHM) and for multifunctional applications at normal and elevated temperatures.
Published Version
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