Piezoresistivity of Carbon Black/Cement-Based Sensor Enhanced with Polypropylene Fibre

Wengui Li*, Wenkui Dong, Surendra P. Shah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In this study, polypropylene (PP) was added to develop carbon black (CB)/cementitious composites as cement-based sensors. The mechanical properties and piezoresistivity were been experimentally investigated. 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. Electrical conductivity increased with the amount of PP fibres, due to the enclosed CB nanoparticles and more conductive passages. 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)
Title of host publicationRILEM Bookseries
PublisherSpringer Science and Business Media B.V.
Pages889-899
Number of pages11
DOIs
StatePublished - 2022
Externally publishedYes

Publication series

NameRILEM Bookseries
Volume36
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Keywords

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

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials

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