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

Yıl 2017, Cilt: 28 Sayı: 2, 7865 - 7882, 01.04.2017

Cihat Yüksel Ali Mardanı-aghabaglou , Ahsanollah Beglarıgale , Halit Yazıcı , Kambiz Ramyar , Özge Andiç Çakır

https://doi.org/10.18400/tekderg.304100

Cited By: 1

Öz

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.     

Anahtar Kelimeler

Alkali silica reaction, alkali leaching, basalt, waste glass

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

Öz

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.     

Anahtar Kelimeler

Alkali silis reaksiyonu, alkali sızıntısı, bazalt, atık cam

Kaynakça

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