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ROVNANÍK, P.; KUSÁK, I.; BAYER, P.
Originální název
Effect of water saturation on the electrical properties of cement and alkali-activated slag composites with graphite conductive admixture
Anglický název
Druh
Článek WoS
Originální abstrakt
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.
Anglický abstrakt
Klíčová slova
Portland cement; slag; alkaline activation; moisture; electrical resistivity
Klíčová slova v angličtině
Autoři
Rok RIV
2023
Vydáno
12.11.2022
Nakladatel
Elsevier
ISSN
0950-0618
Periodikum
Construction and Building Materials
Svazek
361
Číslo
129699
Stát
Spojené království Velké Británie a Severního Irska
Strany počet
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" }