Thermally induced alteration of slag activated by potassium silicate

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Thermally induced alteration of slag activated by potassium silicate

Original language description

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.

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/GA23-04772S" target="_blank" >GA23-04772S: Physical and chemical processes in alkali activated ceramics exposed to high temperatures</a><br>

Continuities

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

Publication year

2025

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

502

Issue of the periodical within the volume

11

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

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UT code for WoS article

001625177300009

EID of the result in the Scopus database

2-s2.0-105021079504