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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA14-25504S" target="_blank" >GA14-25504S: Výzkum chování kompozitů na bázi anorganických matric v extrémních podmínkách</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Materiali in tehnologije

ISSN

1580-2949

e-ISSN

1580-3414

Svazek periodika

49

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

SI - Slovinská republika

Počet stran výsledku

5

Strana od-do

709-713

Kód UT WoS článku

000362700700007

EID výsledku v databázi Scopus

2-s2.0-84947798743