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ROVNANÍK, P. DUFKA, A.
Originální název
EFFECT OF THE AGGREGATE TYPE ON THE PROPERTIES OF ALKALI-ACTIVATED SLAG SUBJECTED TO HIGH TEMPERATURES
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
High temperatures present a risk of destruction for most silicate based construction materials. Although these materials are not flammable, they lose their properties due to a thermal decomposition. In contrast to ordinary Portland cement based materials, alkali-activated slag exhibits better thermal stability when exposed to temperatures up to 1200 °C. Due to its different porosity it is less susceptible to spalling. However, the properties of composites after high temperature treatment depend also on the stability of aggregates. The effect of two different types of aggregate (quartz and chamotte) on the residual mechanical properties and microstructure of alkali-activated slag mortars exposed to 200–1200 °C is presented in this study. The results showed an improved mechanical performance of thermally stable chamotte aggregate at temperatures above 600 °C. Quartz is transformed at 573 °C to high quartz causing volume instability and consequently a strength deterioration. Although chamotte also contains some quartz phase, the reaction of mullite with alkalis from the matrix leads to the formation of albite and anorthite which makes the material tougher, and thus, compensating the negative effect of quartz.
Klíčová slova
alkali-activated slag, high temperatures, chamotte, quartz, strength, microstructure
Autoři
ROVNANÍK, P.; DUFKA, A.
Rok RIV
2015
Vydáno
1. 10. 2015
ISSN
1580-2949
Periodikum
Materiali in tehnologije
Ročník
49
Číslo
5
Stát
Slovinská republika
Strany od
709
Strany do
713
Strany počet
BibTex
@article{BUT117313, author="Pavel {Rovnaník} and Amos {Dufka}", title="EFFECT OF THE AGGREGATE TYPE ON THE PROPERTIES OF ALKALI-ACTIVATED SLAG SUBJECTED TO HIGH TEMPERATURES", journal="Materiali in tehnologije", year="2015", volume="49", number="5", pages="709--713", doi="10.17222/mit.2014.116", issn="1580-2949" }