Thermal and hygric properties of alkali-activated low-reactivity ceramics after high temperature exposure

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00387517" target="_blank" >RIV/68407700:21110/25:00387517 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1742-6596/3146/1/012015" target="_blank" >http://dx.doi.org/10.1088/1742-6596/3146/1/012015</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/3146/1/012015" target="_blank" >10.1088/1742-6596/3146/1/012015</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal and hygric properties of alkali-activated low-reactivity ceramics after high temperature exposure

Popis výsledku v původním jazyce

Alkaline activation is, among other, also a possible way for recycling and reuse of numerous alumino-silicate wastes, including ceramics. While the conventional precursors for alkaline activation (metakaolin, fly ash etc.) are dominantly amorphous, the ceramic waste is more crystalline. This is true especially for red-clay ceramics with high content of quartz and feldspars. However, also such low-reactivity precursors may be activated to product of compressive strength about 40 MPa and flexural strength about 8 MPa and thus with application potential as construction material. Accidentally or intentionally, the alkali-activated material may be exposed to a high-temperature load. Such load influences both phase composition and pore size distribution, and consequently also the mechanical properties of the material. Further, the changes in pore system character are reflected also in thermal and hygric transport parameters such are thermal conductivity and rate of liquid water and water vapor transport. The present paper specifically studies alkali-activated red-clay ceramics powder prepared with Si/Al ratio 1.8 and Al/K 1.1. This material was selected based on preceding experiments as one which has reasonable mechanical properties and moderate content of activator (potassium silicate solution). The thermal and water transport parameters were measured for unloaded as well as thermally loaded (200 °C, 600 °C, and 1000 °C) samples, alongside with porosimetry.

Název v anglickém jazyce

Thermal and hygric properties of alkali-activated low-reactivity ceramics after high temperature exposure

Popis výsledku anglicky

Alkaline activation is, among other, also a possible way for recycling and reuse of numerous alumino-silicate wastes, including ceramics. While the conventional precursors for alkaline activation (metakaolin, fly ash etc.) are dominantly amorphous, the ceramic waste is more crystalline. This is true especially for red-clay ceramics with high content of quartz and feldspars. However, also such low-reactivity precursors may be activated to product of compressive strength about 40 MPa and flexural strength about 8 MPa and thus with application potential as construction material. Accidentally or intentionally, the alkali-activated material may be exposed to a high-temperature load. Such load influences both phase composition and pore size distribution, and consequently also the mechanical properties of the material. Further, the changes in pore system character are reflected also in thermal and hygric transport parameters such are thermal conductivity and rate of liquid water and water vapor transport. The present paper specifically studies alkali-activated red-clay ceramics powder prepared with Si/Al ratio 1.8 and Al/K 1.1. This material was selected based on preceding experiments as one which has reasonable mechanical properties and moderate content of activator (potassium silicate solution). The thermal and water transport parameters were measured for unloaded as well as thermally loaded (200 °C, 600 °C, and 1000 °C) samples, alongside with porosimetry.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

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

Projekt

<a href="/cs/project/GA23-04772S" target="_blank" >GA23-04772S: Fyzikální a chemické procesy v alkalicky aktivované keramice vystavené vysokým teplotám</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Physics: Conference Series 3146

ISBN

—

ISSN

1742-6588

e-ISSN

1742-6596

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

IOP Publishing Ltd.

Místo vydání

Bristol

Místo konání akce

Krynica-Zdroj

Datum konání akce

3. 9. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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