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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GC20-09072J" target="_blank" >GC20-09072J: Tvorba struktury pokročilých silikátových kompozitů se sníženou impedancí</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Construction and building materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

361

Číslo periodika v rámci svazku

129699

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

„“-„“

Kód UT WoS článku

000897584700001

EID výsledku v databázi Scopus

2-s2.0-85141745637