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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU146196" target="_blank" >RIV/00216305:26110/22:PU146196 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.conbuildmat.2022.129699" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2022.129699</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2022.129699" target="_blank" >10.1016/j.conbuildmat.2022.129699</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Project

<a href="/en/project/GC20-09072J" target="_blank" >GC20-09072J: Structure formation of advanced silicate composites with reduced impedance</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Construction and building materials

ISSN

0950-0618

e-ISSN

1879-0526

Volume of the periodical

361

Issue of the periodical within the volume

129699

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

„“-„“

UT code for WoS article

000897584700001

EID of the result in the Scopus database

2-s2.0-85141745637