Odporność na wysoką temperaturę betonów otrzymanych z dwóch różnych cementów

• Autorzy: Koňáková D. , Čáchová M. , Doleželová M. , Scheinherrová L. , Vejmelková E. , Černý R.

Warianty tytułu

EN

High-temperature resistance of concretes produced of two different cements

• Języki publikacji: PL EN

Abstrakty

PL

Konstrukcje betonowe mogą być czasem narażone na ekstremalne warunki, w okresie ich eksploatacji. Ogień, a właściwie działanie wysokich temperatur są typowym przykładem, w których materiały budowlane mogą ulec zniszczeniu. W artykule przedstawiono badania odporności betonów z dwóch różnych cementów poddanych działaniu trzech temperatur: 105°C, 400°C i 1000°C. Oznaczono zmiany następujących właściwości: wytrzymałość, transport wody i pary wodnej, ciepło właściwe oraz przewodność ciepła. Uzyskane wyniki pokazują, że zwykły beton z cementu portlandzkiego nie jest odporny na wysoką temperaturę i jego stosowanie powinno być ograniczone do 400°C. Natomiast beton z cementu glinowego ma lepszą odporność i zachowuje 25% wytrzymałości po poddaniu działania temperatury wynoszącej 1000°C. Zastosowanie włókien bazaltowych, odpornych na wysokie temperatury nie spowodowało poprawy odporności obu betonów.

EN

Concrete structures can sometimes be exposed to the extreme conditions during their lifetime. A fire or, more generally, exposure to high temperatures presents a typical example when a damage to building materials is likely to occur, which can lead eventually to a collapse of the whole structure. In this paper, high-temperature resistance of concretes from different type of cements is analyzed using a characteristic set of measured material parameters. Basic physical properties, mechanical strengths, water- and water vapor transport parameters, and thermal properties are assessed after the exposure to three different temperatures, namely 105°C, 400°C and 1000°C. Experimental results show that ordinary concrete of Portland cement do not resist well to high temperature and their applicability is limited to 400°C. However, concretes from calcium aluminate cement have a better thermal stability and retain about 25% of their strength, even after being exposed to 1000°C. The application of randomly distributed thermally stable basalt fibres is not found to have any substantial effect on the properties of the analyzed concretes.

Słowa kluczowe

PL

kompozyt cementowy; cement portlandzki; cement glinowo-wapniowy; beton; stabilność termiczna; temperatura wysoka; zbrojenie rozproszone; włókno bazaltowe

EN

cement composite; Portland cement; calcium aluminate cement; concrete; thermal stability; high temperature; fibre reinforcement; basalt fiber

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2016
• Tom: R. 21/83, nr 5
• Strony: 295--309
• Opis fizyczny: Bibliogr. 26 poz., il., tab.

Twórcy

autor

Koňáková D.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

autor

Čáchová M.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

autor

Doleželová M.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

autor

Scheinherrová L.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

autor

Vejmelková E.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

autor

Černý R.

• Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic

Bibliografia

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