Betonda ince uçucu kül kullanımı ile ASR genleşmesinin azaltılması

Year 2023, , 351 - 360, 20.06.2023

Hasan Eker , Demet Demir Şahin , Mustafa Çullu

https://doi.org/10.24012/dumf.1158420

Abstract

Bu çalışmada; Kahramanmaraş’ta yer alan bir termik santralden temin edilen C tipi UK, farklı sürelerde öğütülerek farklı oranlarda çimento ile ikame edilmiş ve Alkali silika reaksiyonu (ASR) üzerindeki etkisi incelenmiştir. İlk önce uçucu kül içermeyen referans numune karışımları ASTM C 1260 standardına göre hazırlanmıştır. Daha sonra UK’nin, 0, 10 ve 20 dk öğütme süreleri sonrasında inceltilen malzemenin her birini betonda çimento yerine % 10 ve % 30 ikame edilerek harç numuneleri hazırlanmıştır. Elde edilen numunelerin 3, 7, 14 ve 28 günlük kür süresi sonrasında ASR genleşme ölçümleri gerçekleştirilmiştir. Elde edilen sonuçlara göre; UK’nin eklendiği numunelerin referans numunesine göre ASR boy değişim oranları azalmıştır. Ayrıca öğütme süresinin ve ikame oranının artmasıyla birlikte ASR boy değişim değerlerinde düşüş meydana geldiği görülmüştür. Genel olarak 0, 10 ve 20 dk öğütme sonrası elde edilen farklı blaine incelik değerine sahip UK’ün % 10 ve % 30 ikame oranlarında çimento yerine kullanılarak hazırlanan harç örneklerinin 3,7 ve 14 günlük kür süreleri sonrasında ASR boy değişim değerlerinde artış gözlemlenmiştir. 28 günlük kür süresi sonrasında ise artış gözlemlenmiş ancak bu diğer kür süreleri sonrasında elde edilen değerlere kıyasla daha düşük olduğu belirlenmiştir. Böylece; UK’ün öğütmeye bağlı olarak inceliğinin ve ikame oranının artmasıyla birlikte betonun bünyesindeki boşlukları doldurması sonucunda geçirimsiz bir beton oluşmuş ve betonda oluşan ASR etkisini azaltmıştır. Ayrıca öğütülmüş uçucu küller harç örneklerinin geçirimsizlik özellik kazandırmasının yanı sıra toz bağlayıcılığındaki alkali (Na2O ve K2O) miktarını azaltması ve Ca(OH)2’yi C-S-H jellerine dönüştürmesini sağlayarak ASR oluşumunu engellemiştir.

Keywords

Alkali silika reaksiyonu (ASR), incelik, uçucu kül, C tipi, beton.

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