Przyczyny i mechanizm powstawania odprysków betonu pod wpływem wysokiej temperatury wywołanej pożarem

Mróz, K.; Hager, I.

Artykuł - szczegóły

Tytuł artykułu

Przyczyny i mechanizm powstawania odprysków betonu pod wpływem wysokiej temperatury wywołanej pożarem

Autorzy

Mróz K. , Hager I.

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

Warianty tytułu

Causes and mechanism of concrete spalling under high temperature caused by fire

Języki publikacji

PL EN

Abstrakty

Przedstawiony przegląd obecnej znajomości przyczyn odpryskiwania betonu spowodowanego pożarem wskazuje na dwie główne ich przyczyny: cieplno-mechaniczny i termiczno-wilgotnościowy. Odpryskiwanie betonu występuje wraz ze wzrostem jego wytrzymałości, natomiast nie grozi betonom niskich klas, które mają dużą porowatość otwartą. Stosowanie włókien polipropylenowych nie zawsze zapobiega jego zachodzeniu. Obserwacje uszkodzeń betonu pozwoliły na wyróżnienie czterech rodzajów odpryskiwania w trakcie pożaru: 1) odpryskiwanie kruszywa, 2) odpryskiwanie powierzchniowe, 3) eksplozyjne, 4) odpryskiwanie naroży elementu. Po zakończeniu pożaru występuje piąte jako złuszczania powierzchniowe.

The review of the papers concerning the concrete spalling due to fire exposure are showing two causes: thermo-mechanical and moisture - thermal. Concrete spalling takes place in the case of high strength i.e. HPC, but is not encountered for low grade concrete, which have high porosity. The addition of polypropylene fibres not always can avoid its occurrence. The observation of concrete damages allowed to distinguish four forms of spalling: 1) spalling of aggregate, 2) surface spalling, 3) explosive spalling, 4) spalling of element corners. After fire the fifth forms is known as surface exfoliation.

Słowa kluczowe

pożar warunki pożarowe temperatura wysoka beton odpryskiwanie betonu mechanizm analiza przyczyn

fire fire conditions high temperature concrete spalling mechanism causes analysis

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2017

Tom

R. 21/83, nr 6

Strony

445--456

Opis fizyczny

Bibliogr. 69 poz., il.

Twórcy

autor

Mróz K.

Politechnika Krakowska im. Tadeusza Kościuszki, Instytut Materiałów i Konstrukcji Budowlanych

autor

Hager I.

Politechnika Krakowska im. Tadeusza Kościuszki, Instytut Materiałów i Konstrukcji Budowlanych

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Bibliografia

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