Preparation and piezoresistive properties of carbon fiber-reinforced alkali-activated fly ash/slag mortar

Deng, L. and Ma, Y. and Hu, J. and Yin, S. and Ouyang, X. and Fu, J. and Liu, A. and Zhang, Z. (2019) Preparation and piezoresistive properties of carbon fiber-reinforced alkali-activated fly ash/slag mortar. Construction and Building Materials, 222. pp. 738-749. ISSN 0950-0618


Abstract

In this study, a novel type of conductive mortar was proposed and prepared by alkali-activated fly ash/slag (AAFS) combined with carbon fibers. The workability, mechanical properties, electrical resistivity and piezoresistive properties of carbon fiber-reinforced AAFS (CF-AAFS) mortar were investigated and compared with carbon fiber-reinforced cement mortar (CF-CM). It was found that CF-AAFS exhibited much better workability and significantly higher compressive strength (>66 MPa at 28 days) than CF-CM with the same carbon fiber content. With 0.2 vol% carbon fibers, the electrical resistivity of CF-AAFS mortar decreased from 3313 Ω·cm to 165 Ω·cm at 28 days, reaching the percolation threshold. AAFS mortar with only 0.1 vol% carbon fiber content exhibited good piezoresistivity under both monotonic and cyclic compression. Therefore, CF-AAFS was regarded as a promising material in the use of self-sensing structure in construction.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 28 Feb 2020 02:18
Last Modified: 13 Mar 2020 06:25
Uncontrolled Keywords: carbon fibers, alkali-activated fly ash/slag, electrical resistivity, piezoresistivity, self-sensing materials
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Identification Number or DOI: 10.1016/j.conbuildmat.2019.06.134
URI: http://eprints.usq.edu.au/id/eprint/37890

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