Influence of mixture composition on thermal properties of concrete and the performance of rigid pavements

• Autorzy: Panchmatia P. , Glinicki M. , Olek J.

Identyfikatory

DOI

10.7409/rabdim.014.016

Warianty tytułu

PL

Wpływ składu mieszanki na właściwości termiczne betonu oraz parametry funkcjonalne nawierzchni sztywnych

• Języki publikacji: PL EN

Abstrakty

PL

W najnowszym podręczniku mechanistyczno-empirycznego projektowania nawierzchni drogowych (MEPDG) przy analizie i projektowaniu nawierzchni sztywnych większy nacisk położono na uwzględnienie naprężeń wywołanych termicznym paczeniem się płyt betonowych. Skład mieszanki betonowej ma duży wpływ na parametry termiczne betonu, takie jak współczynnik przewodzenia ciepła, współczynnik rozszerzalności cieplnej oraz ciepło właściwe. W dużym stopniu zależą one od rodzaju i zawartości kruszywa. W stanie wilgotnym beton charakteryzuje się wyższym ciepłem właściwym oraz współczynnikiem przewodzenia ciepła. W artykule omówiono wpływ składu mieszanki na właściwości termiczne betonu stwardniałego, a także na właściwości w początkowym okresie twardnienia. Omówiono również wpływ, jaki na funkcjonalność nawierzchni sztywnych mają sezonowe i dobowe zmiany temperatury. W przypadku nawierzchni lotniskowych cykliczne oddziaływanie gorących spalin wyrzucanych przez silniki odrzutowe powoduje powstawanie mikrospękań, zwiększenie wielkości porów oraz pogorszenie wytrzymałości na ściskanie i na rozciąganie przy zginaniu. Beton poddawany cyklicznemu oddziaływaniu podwyższonej temperatury podlega niszczeniu, którego widoczne skutki przypominają skutki naprzemiennego zamrażania i rozmrażania.

EN

Th e recent mechanistic-empirical pavement design guide (MEPDG) put more emphasis on the effects of thermal curling stresses on rigid pavement analysis and design. Mix design of concrete has significant influence on its thermal properties such as thermal conductivity, coefficient of thermal expansion, and specific heat. Aggregate type and content significantly alter the thermal properties of concrete incorporating them. The moisture state of the concrete increases its specific heat and thermal conductivity. A review of the effect of temperature of fresh concrete on early age properties is also presented. The performance of rigid pavements exposed to seasonal and daily fluctuations in temperature is discussed. Airfield concrete pavements which are subjected to jet engine exhausts experience heat cycles micro-cracking, coarsening of microstructure and loss of compressive and flexural strength. These effects are mostly the result of the dehydration and decomposition of paste matrix in concrete. Heat cycles result in concrete deterioration similar in appearance to freezing and thawing deterioration.

Słowa kluczowe

PL

gradient temperatury; nawierzchnia betonowa; parametry termiczne; współczynnik przewodzenia ciepła; współczynnik rozszerzalności cieplnej

EN

coefficient of thermal expansion; temperature gradient; thermal conductivity; thermal properties; concrete pavement

• Wydawca: Instytut Badawczy Dróg i Mostów
• Czasopismo: Roads and Bridges - Drogi i Mosty
• Rocznik: 2014
• Tom: Vol. 13, no. 3
• Strony: 235--260
• Opis fizyczny: Bibliogr. 45 poz., rys., tab.

Twórcy

autor

Panchmatia P.

• Purdue University, School of Civil Engineering, West Lafayette, IN, USA

autor

Glinicki M.

• Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk, Warszawa

autor

Olek J.

• Purdue University, School of Civil Engineering, West Lafayette, IN, USA

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