4.7 Article

Piezoresistive behaviours of carbon black cement-based sensors with layer-distributed conductive rubber fibres

Journal

MATERIALS & DESIGN
Volume 182, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.108012

Keywords

Carbon black (CB); Conductive rubber fibre; Cement-based sensor; Conductivity; Piezoresistivity; Gauge factor

Funding

  1. Australian Research Council (ARC) [DE150101751]
  2. ARC Industrial Transformation Research Hub Component Project [IH150100006]

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Conductive rubber fibres filled carbon black (CB)/cementitious composites were developed to achieve the cement-based sensors with excellent piezoresistivity in this study. Ameliorations on the conductivity and piezoresistive sensitivity of CB filled composites were mainly explored with conductive rubber fibres embedded. Their compressive strengths were investigated to evaluate the practical application possibility. The results indicated that the composites with CB content <4.0 wt% possessed acceptable compressive strengths. In terms of conductivity and piezoresistivity, both conductivity and piezoresistivity of composites filled with 0.5 wt% CB increased with the rubber content, and their gauge factor raised to 91 when embedded with 80 rubber fibres (1.27 vol%). Moreover, phenomenon of piezoresistive percolation was observed by sharp fractional changes of resistivity for the composites filled with 1.0 wt% CB, where existed highest gauge factor reaching 482 when embedded with same rubber fibres. However, because of the excellent conductivity of 2.0 wt% CB filled composites, the gauge factor firstly increased but then slightly decreased around 100 with increase of rubber fibre content. Overall, conductive rubber fibres can significantly improve the piezoresistivity of CB/cementitious composites by the increased gauge factor. (C) 2019 Published by Elsevier Ltd.

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