Yüksek ve Düşük Kalsiyum İçeren Uçucu Küller ile Üretilen Geopolimer Harçların Fiziksel ve Mekanik Özelliklerinin İncelenmesi

Bu çalışmada, C sınıfı ve F sınıfı uçucu külün birlikte kullanılarak geri dönüşümlerinin sağlanması ve ekonomiye kazandırılması amacıyla üretilen geopolimer harçların fiziksel ve mekanik özellikleri incelenmiştir. C sınıfı uçucu kül (UK) ile F sınıfı UK ’nın %0,%10, %20, %30, %40 ve %50 oranlarında birbirleri ile yer değiştirilmesi ile oluşturulan bağlayıcı, sodyum hidroksit (NaOH) ve potasyum hidroksit (KOH) ile ayrı ayrı aktive edilmiştir. Aktivatör/bağlayıcı oranı %10 olarak kullanılmıştır. Likit/bağlayıcı oranı 0,35, agrega/bağlayıcı oranı 3 olarak belirlenmiştir. UK, kum, aktivatör ve suyun standart çimento mikserinde karıştırılması ile hazırlanan harç numuneler, 40mm×40mm×160 mm boyutlu standart kalıplara yerleştirildikten sonra 100 °C’ de 24 saat süre ile aktivasyon sıcaklığına maruz bırakılmıştır. Daha sonra numuneler 28 gün boyunca hava kürüne (22±2°C) tabi tutulmuşlardır. Hava kürünü takiben fiziksel ve mekanik deneyler gerçekleştirilmiştir. Sonuç olarak %60 C sınıfı ve %40 F sınıfı UK içeren ve NaOH ile üretilen numunelerde 3,8 MPa eğilme dayanımı, 28 MPa basınç dayanımı elde edilmiştir.

Anahtar Kelimeler:

Uçucu kül, geopolimer, eğilme dayanımı, basınç dayanımı, aktivatör

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