Thermally induced alteration of slag activated by potassium silicate

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00386148" target="_blank" >RIV/68407700:21110/25:00386148 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.conbuildmat.2025.144315" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2025.144315</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2025.144315" target="_blank" >10.1016/j.conbuildmat.2025.144315</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermally induced alteration of slag activated by potassium silicate

Popis výsledku v původním jazyce

Alkali-activated materials are considered as a possible alternative to composites based on Portland cement. In this paper, a set of alkali-activated slag (AAS) samples with corundum filler was studied. The activation was performed by potassium silicate/hydroxide mixtures; the composition of mixtures covered the Si/Al molar ratio from 2.7 to 3.5. The increasing Si/Al ratio caused gradually lower pore volume and higher compressive strength (from 59 to 127 MPa). The research on the impact of thermal load (200–1200 ° C) on the AAS was realized by thermogravimetry, thermodilatometry and by determination of residual mechanical properties, phase composition and pore size distribution. While the porosity and threshold pore diameter gradually increased upon the thermal loading, the compressive strength reached its maximum at 200–600 °C was reduced at these medium temperatures. The thermal load 800 ° C, whereas the bending strength and higher promoted crystallization of new phases (akermanite, gehlenite, larnite, spinel) which contributed to the preservation of compressive strength at a satisfactory level even at increasing porosity. Formation of spinel was found to be likely responsible for the significant increase in bending strength at 1200 ° C. The satisfactory thermal resistance of AAS (1200 ° C residual compressive strength 149 MPa) is promising not only with respect to the fire safety of structures but it is also encouraging the application of AAS as refractory material.

Název v anglickém jazyce

Thermally induced alteration of slag activated by potassium silicate

Popis výsledku anglicky

Alkali-activated materials are considered as a possible alternative to composites based on Portland cement. In this paper, a set of alkali-activated slag (AAS) samples with corundum filler was studied. The activation was performed by potassium silicate/hydroxide mixtures; the composition of mixtures covered the Si/Al molar ratio from 2.7 to 3.5. The increasing Si/Al ratio caused gradually lower pore volume and higher compressive strength (from 59 to 127 MPa). The research on the impact of thermal load (200–1200 ° C) on the AAS was realized by thermogravimetry, thermodilatometry and by determination of residual mechanical properties, phase composition and pore size distribution. While the porosity and threshold pore diameter gradually increased upon the thermal loading, the compressive strength reached its maximum at 200–600 °C was reduced at these medium temperatures. The thermal load 800 ° C, whereas the bending strength and higher promoted crystallization of new phases (akermanite, gehlenite, larnite, spinel) which contributed to the preservation of compressive strength at a satisfactory level even at increasing porosity. Formation of spinel was found to be likely responsible for the significant increase in bending strength at 1200 ° C. The satisfactory thermal resistance of AAS (1200 ° C residual compressive strength 149 MPa) is promising not only with respect to the fire safety of structures but it is also encouraging the application of AAS as refractory material.

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/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 periodika

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

502

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

001625177300009

EID výsledku v databázi Scopus

2-s2.0-105021079504