Vliv aktivních příměsí na aktivitu cementového tmele s nealkalickou urychlovací přísadou pro stříkané betony.
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Vysoké učení technické v Brně. Fakulta stavební
Abstract
Bakalárska práca sa zoberá problematikou striekaných betónov zo zameraním na použitie aktívnych prímesí s nealkalickou urýchľovacou prísadou. Teoretická časť je pojatá formou rešerše o dosadávaných poznatkoch používania aktívnych prímesí v striekanom betóne a ich vplyvom na proces hydratácie. V rámci experimentálnej časti bola laboratórne porovnávaná a overovaná reaktivita cementového tmelu s nealkalickými urýchľovačmi na báze síranu hlinitého pri použití aktívnych prímesí (troska, popolček, mikromletý vápenec). Overované boli cementy CEM I 42,5 R od rôznych výrobcov na základe doby tuhnutia a tvrdnutia pomocou Vicatovho prístroja a stanovenia pevnosti v ťahu za ohybu a pevnosti v tlaku po 6 a 24 hodinách.
The bachelor thesis deals with the problems of the sprayed concrete with the focus on usage of the active ingredients with non-alkaline accelerator additive. The theoretical part covers the current level of knowledge of how the active ingredients are used in the sprayed concrete and their influence on the process of hydration. In the experimental part the reactivity of cementing compound with non-alkaline accelerator on the basis of aluminium sulphate were compared in a laboratory when the active ingredients (such as slag, fly-ash and very fine limestone) were used. The cements CEM I 42,5 R, made by different producers were verified on the basis of the setting time and early strength gain using the Vicat needle to examine the mechanical properties after 6 and 24 hours.
The bachelor thesis deals with the problems of the sprayed concrete with the focus on usage of the active ingredients with non-alkaline accelerator additive. The theoretical part covers the current level of knowledge of how the active ingredients are used in the sprayed concrete and their influence on the process of hydration. In the experimental part the reactivity of cementing compound with non-alkaline accelerator on the basis of aluminium sulphate were compared in a laboratory when the active ingredients (such as slag, fly-ash and very fine limestone) were used. The cements CEM I 42,5 R, made by different producers were verified on the basis of the setting time and early strength gain using the Vicat needle to examine the mechanical properties after 6 and 24 hours.
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Keywords
striekaný betón, aktívne prímesi, vysokopecná troska, popolček, mikromletý vápenec, cement, urýchľovacie prísady, síran hlinitý, doba tuhnutia a tvrdnutia, nábeh počiatočných pevností, Sprayed concrete, active ingredients, slag, fly-ash, very fine limestone, cement, non-alkaline accelerator, aluminium sulphate, setting time, early strength gain
Citation
ZÁVACKÝ, J. Vliv aktivních příměsí na aktivitu cementového tmele s nealkalickou urychlovací přísadou pro stříkané betony. [online]. Brno: Vysoké učení technické v Brně. Fakulta stavební. 2017.
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cs
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Stavebně materiálové inženýrství
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2017-06-12
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práce byla úspěšně obhájena
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Standardní licenční smlouva - přístup k plnému textu bez omezení