EFFECT OF THE AGGREGATE TYPE ON THE PROPERTIES OF ALKALI-ACTIVATED SLAG SUBJECTED TO HIGH TEMPERATURES

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F15%3APU115694" target="_blank" >RIV/00216305:26110/15:PU115694 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.17222/mit.2014.116" target="_blank" >http://dx.doi.org/10.17222/mit.2014.116</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.17222/mit.2014.116" target="_blank" >10.17222/mit.2014.116</a>

Result language
angličtina
Original language name
EFFECT OF THE AGGREGATE TYPE ON THE PROPERTIES OF ALKALI-ACTIVATED SLAG SUBJECTED TO HIGH TEMPERATURES
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20101 - Civil engineering

Project
<a href="/en/project/GA14-25504S" target="_blank" >GA14-25504S: Research of Behaviour of Inorganic Matrix Composites Exposed to Extreme Conditions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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