Electrical and piezoresistive sensing capacities of cement paste with multi-walled carbon nanotubes

Doo Yeol Yoo, Ilhwan You, Seung Jung Lee

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

This study examined the feasibility of using multi-walled carbon nanotubes (MWCNTs) in cement paste for piezoresistive sensors. Two types of MWCNTs with different carbon content (>90% and >99%) were incorporated into cement paste at 1% by weight of binder (1 wt%). Plain cement paste and cement composites including 1 wt% graphite nanofiber (GNF) and graphene (G) were also considered for comparisons of the electrical conductivity. The test results indicate that the MWCNTs more effectively improved the conductivity of the cement paste than GNF and G. In addition, composites with MWCNTs with lower flowability had less resistivity than those with higher flowability. The size effect in electrical resistivity was observed in the cement pastes with and without the carbon-based nanomaterials, but it was mitigated by incorporating MWCNTs in the cement paste. The stresses and strains under cyclic compression and monotonic tension were well simulated by the measured fraction change in the resistivity of the composites with 1 wt% MWCNTs. The gauge factor (GF) for the composites with 1 wt% MWCNTs was higher than that of commercially available strain gauges, and it was affected by the loading condition: a higher GF obtained under compression than under tension.

Original languageEnglish
Pages (from-to)371-384
Number of pages14
JournalArchives of Civil and Mechanical Engineering
Volume18
Issue number2
DOIs
Publication statusPublished - 2018 Feb

Bibliographical note

Publisher Copyright:
© 2017 Politechnika Wrocławska

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Mechanical Engineering

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