Metakaolin/carbon black geopolymer with enhanced electrical properties

Alkali-activated binders represent a promising material for composites with self-sensing properties both for their lower environmental impact and ability to transfer the electric charge through ionic mobility. Metakaolin geopolymers with carbon black conductive admixture up to 4% were produced to te...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-06, Vol.549 (1), p.12033
Main Authors: Mizerová, C, Kusák, I, Rovnaník, P, Bayer, P
Format: Article
Language:English
Subjects:
Activated carbon
Carbon black
Charge transfer
Compressive strength
Electrical properties
Environmental impact
Frequency ranges
Geopolymers
Ionic mobility
Mechanical properties
Metakaolin
Microstructure
Permittivity
Porosity
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Summary:Alkali-activated binders represent a promising material for composites with self-sensing properties both for their lower environmental impact and ability to transfer the electric charge through ionic mobility. Metakaolin geopolymers with carbon black conductive admixture up to 4% were produced to test their electrical properties, mechanical properties and microstructure. Electrical capacitance, resistance and relative permittivity were determined via impedance spectroscopy analysis. Notable enhancement of all mentioned electrical parameters was registered from 2% carbon black content, especially at lower frequency range. Another carbon black addition was rather unreasonable due to only slight improvement in electrical properties but significant drop of compressive strength and unfavourable changes in pore volume and binder microstructure determined by mercury intrusion porosimetry and electron microscope.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/549/1/012033