Experimental investigation of the piezoresistive properties of cement composites with hybrid carbon fibers and nanotubes

Seung Jung Lee, Ilhwan You, Goangseup Zi, Doo Yeol Yoo

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Cement-based sensors with hybrid conductive fillers using both carbon fibers (CFs) and multi-walled carbon nanotubes (MWCNTs) were experimentally investigated in this study. The self-sensing capacities of cement-based composites with only CFs or MWCNTs were found based on preliminary tests. The results showed that the percolation thresholds of CFs and MWCNTs were 0.5-1.0 vol.% and 1.0 vol.%, respectively. Based on these results, the feasibility of self-sensing composites with four different amounts of CFs and MWCNTs was considered under cyclic compression loads. When the amount of incorporated CFs increased and the amount of incorporated MWCNTs decreased, the self-sensing capacity of the composites was reduced. It was concluded that cement-based composites containing both 0.1 vol.% CFs and 0.5 vol.% MWCNTs could be an alternative to cement-based composites with 1.0 vol.% MWCNTs in order to achieve equivalent self-sensing performance at half the price. The gauge factor (GF) for that composite was 160.3 with an R-square of 0.9274 in loading stages I and II, which was similar to the GF of 166.6 for the composite with 1.0 vol.% MWCNTs.

Original languageEnglish
Article number2516
JournalSensors (Switzerland)
Volume17
Issue number11
DOIs
Publication statusPublished - 2017 Nov 2

Keywords

  • Carbon fibers
  • Cement-based sensor
  • Electrical resistivity
  • Fractional change of resistivity
  • Gauge factor
  • Hybrid fillers
  • Multi-walled carbon nanotubes
  • Percolation threshold

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

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