Sensing properties of CNT-filled cement-based stress sensors

Baoguo Han, Xun Yu, Kun Zhang, Eil Kwon, Jinping Ou

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The piezoresistive responses of carbon nanotube (CNT)-filled cement-based sensors are investigated at different compressive stress amplitudes and different loading rates. The correlation between compressive stress and the change in electrical resistance of the sensors is established for the compressive stress in the range from 0 to 10 MPa. Experimental results indicate that the CNT-filled cement-based sensors have stable and reversible piezoresistive responses within the elastic regime. The fabricated sensors achieve a sensitivity of 0. 911 kΩ/MPa, a linearity of 7. 16%, a repeatability of 1. 53% and a hysteresis of 7. 24%, and the relationship between input (compressive stress) and output (change in electrical resistance) of the sensors is ΔR = -0. 911σ. The piezoresistive responses of the sensors are almost free from the effect of loading rate when the loading rate is lower than 0. 20 cm/min. If the loading rate exceeds 0. 20 cm/min, it will affect the piezoresistive responses of the sensors, and the effect increases with the loading rate.

Original languageEnglish (US)
Pages (from-to)17-24
Number of pages8
JournalJournal of Civil Structural Health Monitoring
Volume1
Issue number1-2
DOIs
StatePublished - 2011

Keywords

  • CNT
  • Cement-based sensors
  • Loading rates
  • Performance parameters
  • Piezoresistivity
  • Stress amplitudes

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