Publication detail

Effect of water saturation on the electrical properties of cement and alkali-activated slag composites with graphite conductive admixture

ROVNANÍK, P. KUSÁK, I. BAYER, P.

Original Title

Effect of water saturation on the electrical properties of cement and alkali-activated slag composites with graphite conductive admixture

Type

journal article in Web of Science

Language

English

Original Abstract

This study investigated the influence of water saturation degree on the electrical properties of two different types of building materials – Portland cement and alkali-activaed slag mortars with graphite powder as a conductive admixture. The graphite content ranged between 0–18 wt.% of the cement/slag in order to cover the area below as well as above the percolation threshold. The properties were tested in terms of electrical resistivity measurement with an AC-frequency in the range of 40 Hz – 1 MHz, and the results were correlated with meso-scale structural changes evaluated by means of mercury intrusion porosimetry and scanning electron microscopy. The electrical resistivity of both materials decreased with increasing AC-source frequency and increasing water saturation degree. In a dry state, alkali-activated slag exhibited approximately ten times lower resistivity than cement-based material. The additon of graphite gradually decreased the resistivity until the percolation threshold was reached, but no influence of moisture on the resistivity was observed at dosages exceeding 12 wt.% of graphite. The dependance of electrical resistivity on the water saturation degree was fitted for two different frequencies (50 Hz and 1 kHz) using a sigmoidal regression function.

Keywords

Portland cement; slag; alkaline activation; moisture; electrical resistivity

Authors

ROVNANÍK, P.; KUSÁK, I.; BAYER, P.

Released

12. 11. 2022

Publisher

Elsevier

ISBN

0950-0618

Periodical

Construction and building materials

Year of study

361

Number

129699

State

United Kingdom of Great Britain and Northern Ireland

Pages count

11

URL

https://doi.org/10.1016/j.conbuildmat.2022.129699

BibTex

@article{BUT179952,
  author="Pavel {Rovnaník} and Ivo {Kusák} and Patrik {Bayer}",
  title="Effect of water saturation on the electrical properties of cement and alkali-activated slag composites with graphite conductive admixture",
  journal="Construction and building materials",
  year="2022",
  volume="361",
  number="129699",
  pages="11",
  doi="10.1016/j.conbuildmat.2022.129699",
  issn="0950-0618",
  url="https://doi.org/10.1016/j.conbuildmat.2022.129699"
}