Effects of CNT concentration level and water/cement ratio on the piezoresistivity of CNT/cement composites

Baoguo Han, Xun Yu, Eil Kwon, Jinping Ou

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Carbon nanotube (CNT)/cement composites with different concentration levels of multi-walled CNT (MWNT) and water/cement ratios are fabricated. By comparing the responses of electrical resistance of these CNT/cement composites to compressive stress, the effects of MWNT concentration level and water/cement ratio on the piezoresistive sensitivity of composites are investigated. Experimental results indicate that the piezoresistive sensitivities of CNT/cement composites with 0.05, 0.1, and 1 wt% of MWNT first increase and then decrease with the increase of CNT concentration levels. Water/cement ratio is another factor that affects the composite properties, the electrical resistance of CNT/cement composite with 0.6 water/cement ratio is more sensitive to compressive stress than that of composite with 0.45 water/cement ratio. The piezoresistive sensitivity is heavily dependent on the conductive network in the composites, which in turn is influenced by the CNT concentration level and water/cement ratio.

Original languageEnglish (US)
Pages (from-to)19-25
Number of pages7
JournalJournal of Composite Materials
Volume46
Issue number1
DOIs
StatePublished - Jan 1 2012

Keywords

  • CNT concentration level
  • CNT/cement composites
  • piezoresistivity
  • sensitivity
  • water/cement ratio

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