Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 267, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.121046
Keywords
Piezoresistivity; Conductivity; Sensitivity; Superelastic SMA fibre; Steel fibre; Carbon fibre; Mechanical properties
Categories
Funding
- Australian Government Research Training Program (RTP) Scholarship
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The piezoresistive behavior of self-compacting cementitious composites incorporating SMAFs, SFs, and CFs is investigated, allowing stress and strain sensing under cyclic compression.
The composites consist of cement, fly ash, ground-granulated blast-furnace slag, and silica fume with various fiber volume fractions.
The piezoresistive behaviour of self-compacting cementitious composites incorporating superelastic nickel-titanium shape memory alloy fibres (SMAFs), steel fibres (SFs), and carbon fibres (CFs) is presented. Piezoresistivity in the cementitious composites allows sensing stress and strain under cyclic compression. The matrix of composites consists of cement, fly ash, ground-granulated blast-furnace slag, and silica fume as the binder and both fine aggregate. Six fibre volume fractions ranging from 0.25% to 1.50% at intervals of 0.25% are considered for SMAFs and SFs while CFs are added at low volume fractions ranging from 0.1% to 0.6% at intervals of 0.1%. First, fresh and mechanical properties of the developed composites are discussed. Then, the piezoresistive sensitivity, repeatability, and gauge factor are analysed under cyclic compressive stress with an amplitude of 10 MPa. Results show noticeable polarisation in composites with SMAFs and SFs, compared to CF reinforced composites. A maximum gauge factor of 935 and the highest correlation coefficient between fractional change in resistivity and compressive strain are obtained for the composite containing 0.6% CFs. (C) 2020 Elsevier Ltd. All rights reserved.
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