Mineral katkılı betonların kimyasal durabilitesinin toplam bağlayıcı miktarı ve eşdeğer su/çimento parametreleriyle beraber incelenmesi

Anıl Niş

Öz


Bu çalışmada değişik mineral katkılar içeren farklı betonların hava, %3,5 deniz suyu ve %5 sülfürik asit ortamlarında durabilite performansı toplam bağlayıcı miktarı ve eşdeğer su/çimento oranı parametreleri ile beraber incelenmesi amaçlanmıştır. Deney kapsamında farklı kimyasal etkilere karşı kontrol betonu (K), uçucu kül katkılı beton (U), cüruf katkılı beton (C), ve hem uçucu kül hem de silis dumanı katkılı beton (US) üretilmiştir. Kontrol (K) ve uçucu kül betonlarının (U) eşdeğer su/çimento oranı 0.45 olup, bağlayıcı miktarları sırasıyla 400 ve 470 kg/m3’tür. Cüruflu (C) ve hem uçucu kül hem de silis dumanı içeren betonların (US) betonların eşdeğer su/çimento oranı 0.53 olup, bağlayıcı miktarları 500 ve 440 kg/m3’tür. Eşdeğer su/çimento hesapları TS 13515 standardına göre belirlenmiştir. Üretilen betonların farklı ortamlardaki durabilite performansı görsel inceleme, ağırlık ve basınç dayanımlarındaki değişimler ile belirlenip, toplam bağlayıcı ve eşdeğer su/çimento oranı parametrelerinin beton performansına etkileri kapsamlı bir şekilde irdelenmiştir. Sonuçlara göre, uçucu küllü ve silis dumanlı beton diğer betonlardan daha yüksek eşdeğer su/çimento oranına ve diğerlerinden daha az bağlayıcı miktarı içermesine rağmen kimyasal etkilere karşı en iyi performansı göstermiştir. En kötü kimyasal performansı ise yüksek CaO içerdiğinden cüruflu ve kontrol betonlar göstermiştir. TS 13515 standardında kullanılan çimento eşdeğerlik katsayısı uçucu kül için uygun sonuçlar verirken, cüruflu ve silis dumanı içeren betonların eşdeğer su/çimento hesaplamalarında kullanılmak üzere TS 13515 standardına önemli tavsiyelerde bulunulmuştur.

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