Alkali-Silica Reaction Expansions and the Extent of Alkali Leaching in Concretes Containing Basalt and Waste Glass as Aggregate

Abstract

Alkali-silica reaction (ASR) which takes place between amorphous silica in the aggregate and alkalis in the pore fluid is one of the durability problems causing deterioration of mortars. In this study, alkali-silica reactivity of various mixtures was evaluated according to AAR-3 and AAR-4 tests developed by RILEM. For determining the extent of alkali leaching from the specimens during these accelerated tests, samples were taken from the water accumulations at the bottom of the containers and sodium and potassium concentrations were determined using atomic absorption spectrometry. Results show that although a significant amount of alkalis can leach out, particularly waste glass aggregate leads to considerably high expansion levels.     

Keywords

• Alkali silica reaction,alkali leaching,basalt,waste glass

Bazalt ve Atık Cam Agregalı Betonlarda Alkali-Silis Reaksiyonu Genleşmeleri ve Alkali Sızıntısı Seviyeleri

Abstract

Agregada bulunan amorf silis ve boşluk çözeltisindeki alkaliler arasında gerçekleşen alkali-silis reaksiyonu (ASR), hasarla sonuçlanan önemli durabilite sorunlarındandır. Bu çalışmada, çeşitli karışımların alkali-silis reaktiviteleri, RILEM komitesi tarafından geliştirilen AAR-3 ve AAR-4 deneyleriyle araştırılmıştır. Bu hızlandırılmış deneylerde numunelerde yer alan alkalilerin ne kadarının dışarıya sızdığını belirlemek için kapların alt kısmında yer alan sudan örnekler alınmış ve atomik absorpsiyon spektrometrisi ile sodyum ve potasyum iyonlarının konsantrasyonu belirlenmiştir. Sonuçlara göre alkalilerin önemli bir miktarının betonlardan dışarıya sızabildiği ve buna rağmen, özellikle atık cam agregası içeren karışımlarda halen çok yüksek miktarda genleşme ile karşılaşıldığı görülmüştür.     

Keywords

• Alkali silis reaksiyonu,alkali sızıntısı,bazalt,atık cam

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