Zapobieganie powstawaniu spękań w betonowych nawierzchniach

• Autorzy: Cicek E.

Warianty tytułu

EN

Mitigating the cracks in concrete pavements

• Języki publikacji: PL EN

Abstrakty

PL

Nawierzchnie betonowe mają duże znaczenie dla zachowania płynności ruchu na drogach. Jednak na tych nawierzchniach mogą powstawać spękania na skutek niepożądanej reakcji kruszyw zawierających aktywną krzemionkę z wodorotlenkami sodu i potasu [RSPK]. Dlatego w wielu częściach świata należy stosować odpowiednie metody, aby uniknąć nadmiernej ekspansji, wywoływanej tą reakcją. Ten artykuł zawiera obszerny opis prac zawartych w literaturze. Dotyczą one szczególnie metod zapobiegających szkodliwej ekspansji towarzyszącej tej reakcji oraz omawiają zalecenia dotyczące oceny i naprawy istniejących konstrukcji. Ogólnie, każda metoda zmniejszania ekspansji w inny sposób wpływa na RSPK. Warunki otoczenia, dobór surowców mieszanki betonowej oraz rodzaje materiału odgrywają ważną rolę w RSPK. Ponadto stwierdzono, że pękaniu betonu wywołanemu przez tę reakcję można zapobiegać nie tylko czynnikami chemicznymi, ale także mechanicznymi. Przeprowadzono doświadczenia, w których wykazano korzystny wpływ żużla i niereaktywnego kruszywa na ograniczenie RSPK. Badania prowadzono w pięciu różnych wariantach. Badano wpływ na ekspansję przez 3, 7 i 14 dni. Dodatkowo stwierdzono, że różne rodzaje kruszywa mogą mieć różny wpływ na ograniczenie ASR.

EN

Concrete pavements has a significant importance for traffic flow. Undesirable cracks can be occurred in pavements by alkali silica reaction [ASR]. Therefore, in many parts of the world, precautions must be taken to avoid excessive expansion due to alkali-silica reactivity in concrete pavements. In this study, an intensive research has been conducted by using literature survey. Additionally, it includes an overview of the nature of ASR, the measure values to prevent deleterious reactions, and recommendations for evaluation and repairing of existing structures. As a result, each reducing method has different effects on ASR. Ambient conditions, ratios of concrete mixture, material types have important roles in ASR. Furthermore, it has been determined that cracks occurred in the concrete due to ASR can be prevented by not only chemical but also mechanical effects. Additionally, for this study some tests were made and results were compared the effects of slag and harmless aggregate on mitigating ASR. Five different conditions were used in the tests and mitigating effects for 3, 7 and 14 days were measured. The results were compared and a suitable condition was advised. Additionally, it was founded that different aggregate types can have different mitigating effect equations.

Słowa kluczowe

PL

nawierzchnia betonowa; skład chemiczny; reakcja alkalia-krzemionka; metoda ograniczania; ASR

EN

concrete pavement; chemical composition; alkali-silica reaction; mitigating method; ASR

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2018
• Tom: R. 23/85, nr 6
• Strony: 453--467
• Opis fizyczny: Bibliogr. 41 poz., il., tab.

Twórcy

autor

Cicek E.

• Department of Civil Engineering, Hacettepe University, Ankara, Turkey

Bibliografia

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