Sporządzanie mieszanki betonowej w wysokich temperaturach: urabialność, wytrzymałość i trwałość

Frigione, M.; Mairo, N.

Artykuł - szczegóły

Tytuł artykułu

Sporządzanie mieszanki betonowej w wysokich temperaturach: urabialność, wytrzymałość i trwałość

Autorzy

Frigione M. , Mairo N.

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

Warianty tytułu

Concrete mixing at elevated temperature: workability, strength and durability

Języki publikacji

PL EN

Abstrakty

Zmniejszenie wytrzymałości po dłuższym okresie, a nawet pogorszenie trwałości betonu może nastąpić w przypadku poddania go obróbce cieplnej. Jako prawdopodobny powód podaje się, między innymi, powstawanie gradientów temperatury w betonie, w trakcie obróbki cieplnej. W celu wyeliminowania naprężeń cieplnych zaproponowano następujący tok postępowania w tej pracy: składniki mieszanki betonowej ogrzewa się do 80°C, a próbki formuje się w gorących formach i natychmiast poddaje obróbce parą w 80°C w ciągu 4 godzin. Następnie, po ochłodzeniu przechowuje się je w powietrzu w temperaturze 20°C i W. W. > 95% aż do czasu pomiarów. Dla porównania, w przypadku drugiego betonu składniki mieszano w 20°C, a próbki po związaniu betonu poddawano obróbce parą w 80°C, stosując klasyczną technologię. Trzeci beton przygotowano mieszając składniki w 20°C oraz przechowując beton w powietrzu, w temperaturze 20°C i W.W. > 95%. Wszystkie betony uzyskano równolegle z cementu portlandzkiego i hutniczego. Stwierdzono, że zaproponowana technologia, polegająca na podgrzewaniu składników mieszanki i formowaniu próbek w 80°C oraz ich obróbce parą w tej temperaturze, jest korzystna dla betonu z cementu hutniczego, tak w odniesieniu do wczesnej wytrzymałości jak i po dłuższym twardnieniu oraz w odporności na korozję siarczanową.

Loss of durability and strength after longer time of hardening can occur when concrete is heat treated. An explanation is the presence of fine cracks caused, among other, by the temperature gradient in concrete, during thermal treatment. In order to avoid thermal stresses, the following treatment was proposed in the present study: concrete mix ingredients were heated at 80°C and test specimens, were cast in the hot moulds and immediately steam treated at 80°C tor 4 hours. They were, then, cooled and cured at 20°C and R.H. > 95% up to testing age. For comparison second concrete components were mixed at 20°C. Test specimens, after concrete set, were steam treated at 80°C, in a classic manner. The third concrete was mixed at 20°C and cured in air at 20°C and R.H. > 95%. All concretes were made parallel of Portland cement and slag cement. It was found that the effect of the proposed treatment (heating the concrete mix ingredients) on the resistant to sulphate attack and on early strength as well as after longer hardening was very favourable for slag cement concrete.

Słowa kluczowe

prefabrykat betonowy technologia produkcji mieszanka betonowa sporządzanie mieszanki temperatura podwyższona naparzanie powstawanie etryngitu cement hutniczy odporność na siarczany

precast concrete unit production technology concrete mix mix preparation elevated temperature steam curing ettringite formation slag cement sulphate resistance

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2015

Tom

R. 20/82, nr 2

Strony

115--129

Opis fizyczny

Bibliogr. 59 poz., il., tab.

Twórcy

autor

Frigione M.

Department of Engineering for Innovation, University of Salento, Lecce, Italy

autor

Mairo N.

Studio Mairo, Roma, Italy

Bibliografia

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Bibliografia

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