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Article

Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression

Faculty of Civil Engineering, Brno University of Technology, Veveří 95, 602 00 Brno, Czech Republic
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Academic Editors: Maria Harja and Rui Miguel Novais
Materials 2021, 14(16), 4350; https://doi.org/10.3390/ma14164350
Received: 9 June 2021 / Revised: 15 July 2021 / Accepted: 30 July 2021 / Published: 4 August 2021
(This article belongs to the Special Issue Application of the Acoustic Emission Method in Concrete Materials)
The development of smart materials is a basic prerequisite for the development of new technologies enabling the continuous non-destructive diagnostic analysis of building structures. Within this framework, the piezoresistive behavior of fly ash geopolymer with added carbon black under compression was studied. Prepared cubic specimens were doped with 0.5, 1 and 2% carbon black and embedded with four copper electrodes. In order to obtain a complex characterization during compressive loading, the electrical resistivity, longitudinal strain and acoustic emission were recorded. The samples were tested in two modes: repeated loading under low compressive forces and continuous loading until failure. The results revealed piezoresistivity for all tested mixtures, but the best self-sensing properties were achieved with 0.5% of carbon black admixture. The complex analysis also showed that fly ash geopolymer undergoes permanent deformations and the addition of carbon black changes its character from quasi-brittle to rather ductile. The combination of electrical and acoustic methods enables the monitoring of materials far beyond the working range of a strain gauge. View Full-Text
Keywords: fly ash; geopolymer; carbon black; piezoresistivity; compressive loading; acoustic emission fly ash; geopolymer; carbon black; piezoresistivity; compressive loading; acoustic emission
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MDPI and ACS Style

Mizerová, C.; Kusák, I.; Topolář, L.; Schmid, P.; Rovnaník, P. Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression. Materials 2021, 14, 4350. https://doi.org/10.3390/ma14164350

AMA Style

Mizerová C, Kusák I, Topolář L, Schmid P, Rovnaník P. Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression. Materials. 2021; 14(16):4350. https://doi.org/10.3390/ma14164350

Chicago/Turabian Style

Mizerová, Cecílie, Ivo Kusák, Libor Topolář, Pavel Schmid, and Pavel Rovnaník. 2021. "Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression" Materials 14, no. 16: 4350. https://doi.org/10.3390/ma14164350

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