Journal
SMART MATERIALS AND STRUCTURES
Volume 28, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-665X/ab3d59
Keywords
self-sensing concrete; strain sensing; recycled carbon fibre; smart material
Funding
- Spanish Ministry of Economy and Competitiveness through the Torres Quevedo Program [PTQ-1407072, PTQ-15-07562]
- Catalan Government through the Industrial Doctorate program [DI-2015-013]
- company, Escofet 1886
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The electrical and piezo-resistive responses of recycled carbon fibre (rCF)-reinforced concrete is analysed in this article. Two different PAN-based rCFs (monofilament rCF and fibrillated rCF sheets) incorporated into dry concrete mix were investigated. Piezo-resistivity was evaluated by simultaneously monitoring the variation in the applied DC voltage during both flexural and compressive tests. Although both plain and rCF-reinforced concrete samples showed piezoresistive responses, the latter show increased signal-to-noise-ratio and thus behave like selfsensing materials. The electrical behaviour suggests a mixed control owing to both ionic and electronic conductivity, with the dominant one depending on the rCF content and rCF dispersion. This work enhances the possibility of generalising the use of smart cementitious materials in the civil engineering industry.
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