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FIALA, L. ROVNANÍK, P. ČERNÝ, R.
Original Title
Experimental analysis of electrical properties of composite materials
Type
conference paper
Language
English
Original Abstract
Dry cement-based composites are electrically non-conductive materials that behave in electric field like dielectrics. However, a relatively low amount of electrically conductive admixture significantly increases the electrical conductivity which extends applicability of such materials in practice. Therefore, they can be used as self-monitoring sensors controlling development of cracks; as sensors monitoring moisture content or when treated by an external electrical voltage as heat sources used for deicing of material’s surface layer. Alkali-activated aluminosilicates (AAA), as competing materials to cement-based materials, are intensively investigated in the present due to their superior durability and environmental impact. Whereas the electrical properties of AAA are similar to those cement-based, they can be enhanced in the same way. In both cases, it is crucial to find a reasonable amount of electrically conductive phase to design composites with a sufficient electrical conductivity at an affordable price. In this paper, electrical properties of composites based on AAA binder and electrically conductive admixture represented by carbon nanotubes (CNT) are investigated. Measurements of electrical properties are carried out by means of 2-probes DC technique on nine types of samples; reference sample without the conductive phase and samples with CNT admixture in amount of 0.1 % - 2.5 % by vol. A significant increase of the electrical conductivity starts from the amount of 0.5 % CNT admixture and in case of 2.5 % CNT is about three orders of magnitude higher compared to the reference sample.
Keywords
Alkali-activated aluminosilicates; CNT; Electrical conductivity; DC measurements
Authors
FIALA, L.; ROVNANÍK, P.; ČERNÝ, R.
Released
24. 2. 2017
Publisher
AIP Publishing
ISBN
978-0-7354-1477-8
Book
AIP Conference Proceedings: PROCEEDINGS OF THE 6TH INTERNATIONAL ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE CONGRESS & EXHIBITION: (APMAS 2016)
Edition
1809
0094-243X
Periodical
AIP conference proceedings
Year of study
State
United States of America
Pages from
020016-1
Pages to
020016-6
Pages count
6