Publication detail

The Effect of Exposure Conditions on the Properties of Cementitious Composites with Reduced Electrical Resistivity

UHER V. ČERNÝ, V. DROCHYTKA, R. BARÁNEK, Š.

Original Title

The Effect of Exposure Conditions on the Properties of Cementitious Composites with Reduced Electrical Resistivity

Type

journal article in Web of Science

Language

English

Original Abstract

Cement composite materials with reduced resistivity are specialized building materials, which are constantly pushing their limits. Research into these composites requires a study of the influences of exposure conditions on resistivity. The mixes selected for the purpose of the research included the reference, pure cement mix, and mixes with proportions of graphite under and above the percolation threshold, with two different types of graphite. It was found that the resistivity of all the tested mixes decreases if moisture grows; the influence of moisture is more significant for mixes with graphite proportions below the percolation threshold. The resistivity of all the tested mixes decreases with increasing temperatures; the influence of a higher temperature (50 °C) is more significant for mixes with graphite proportions above the percolation threshold; however, these mixes are, at the same time, more resistant to permanent changes in resistivity caused by frost (−10 °C). It was found that the action of CO2 causes a reduction in resistivity. Mixes with proportions of graphite above the percolation threshold show higher stability when exposed to CO2. Mixes with proportions of graphite below the percolation threshold are extremely sensitive to horizontally oriented pressure loads. Increases in resistivity caused by vertical pressure loads were by 20–40%. The resistivity of the mixes with proportions of graphite above the percolation threshold was less sensitive to the pressure load.

Keywords

cement composite; graphite; electrical resistivity; percolation threshold; moisture; temperature; carbon dioxide; pressure load

Authors

UHER V.; ČERNÝ, V.; DROCHYTKA, R.; BARÁNEK, Š.

Released

3. 12. 2022

Publisher

MDPI

Location

Switzerland

ISBN

2075-5309

Periodical

Buildings

Year of study

12

Number

12

State

Swiss Confederation

Pages from

1

Pages to

22

Pages count

22

URL

https://www.mdpi.com/2075-5309/12/12/2124

BibTex

@article{BUT180733,
  author="Vojtěch {Uher} and Vít {Černý} and Rostislav {Drochytka} and Šimon {Baránek}",
  title="The Effect of Exposure Conditions on the Properties of Cementitious Composites with Reduced Electrical Resistivity",
  journal="Buildings",
  year="2022",
  volume="12",
  number="12",
  pages="1--22",
  doi="10.3390/buildings12122124",
  issn="2075-5309",
  url="https://www.mdpi.com/2075-5309/12/12/2124"
}