Publication detail

The assessment of mechanical properties of thermally stressed composite materials using radio frequency electrical field

KUSÁK, I. LUŇÁK, M. DVOŘÁK, R. CHOBOLA, Z.

Original Title

The assessment of mechanical properties of thermally stressed composite materials using radio frequency electrical field

Type

conference paper

Language

English

Original Abstract

The main topic of this paper is the testing of cement-based composite materials that were stressed by high temperature. Impedance spectroscopy has been used as a non-destructive measurement method. The specimens were made from mortar mixture of CEM I type Portland cement, silica sand and fine gravel of various size classes for two sets of specimens. The sets, A and B, differed from each other also by the plasticizer used. The specimens were exposed to high temperatures in the range 23–1200°C. Studying the structural changes in the process of heat build-up is an efficient way to assess the reliability of whole construction. Using the impedance spectra the relative permittivity, electrical conductivity and other characteristics have been obtained. In accordance with Debye‘s theory of dielectrics the changes of impedance parameters have been put into context with structural changes. For higher range of frequencies, 100 MHz up to 3 GHz, R&S ZNC vector analyzer with DAK 12 coaxial probe manufactured by Speag has been used. In this frequency spectrum the electrical conductivity and relative permittivity as a function of frequency have been measured.

Keywords

Heat stress; concrete; impedance spectroscopy; conductivity

Authors

KUSÁK, I.; LUŇÁK, M.; DVOŘÁK, R.; CHOBOLA, Z.

Released

12. 7. 2018

Publisher

IOP Publishing

Location

United Kingdom

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

6

Pages count

6

BibTex

@inproceedings{BUT156793,
  author="Ivo {Kusák} and Miroslav {Luňák} and Richard {Dvořák} and Zdeněk {Chobola}",
  title="The assessment of mechanical properties of thermally stressed composite materials using radio frequency electrical field",
  booktitle="21st International Conference on Building Materials, Products and Technologies",
  year="2018",
  journal="IOP Conference Series: Materials Science and Engineering",
  pages="1--6",
  publisher="IOP Publishing",
  address="United Kingdom",
  doi="10.1088/1757-899X/379/1/012030",
  issn="1757-8981"
}