Piezoresistivity enhancement of functional carbon black filled cement-based sensor using polypropylene fibre

Wenkui Dong, Wengui Li*, Kejin Wang, Yipu Guo, Daichao Sheng, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

In this study, different dosages of carbon black (CB) and polypropylene (PP) were added to develop functional cementitious composites as cement-based sensors. The results show that electrical conductivity increased with the amount of PP fibres, due to the enclosed CB nanoparticles and more conductive passages. The compressive strength slightly decreased, while the flexural strength was significantly increased with the increased amount of PP fibres. The improvement is mainly achieved by the reduced CB concentration in cement matrix and the excellent tensile strength of PP fibres. Under the cyclic compression, the piezoresistivity increased by three times for 0.4 wt% PP fibres filled CB/cementitious composite, regardless of the loading rates. The flexural stress sensing efficiency was considerably lower than that of compressive stress sensing, but it increased with the amount of PP fibres. Moreover, fitting formulas were proposed and used to evaluate the self-sensing capacity, with the attempts to apply cement-based sensors for structural health monitoring.

Original languageEnglish (US)
Pages (from-to)184-194
Number of pages11
JournalPowder Technology
Volume373
DOIs
StatePublished - Aug 2020

Keywords

  • Carbon black
  • Cement-based sensor
  • Microstructure
  • Piezoresistivity
  • Polypropylene fibre

ASJC Scopus subject areas

  • Chemical Engineering(all)

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