Examination of Mechanical and Durability Properties of Fly Ash Based and Slag Added Geopolymer Concretes

Abstract

In this study, a mixture of fly ash (UK) and blast furnace slag (YFC) as an alumino-silicate source and NaOH and Na2SiO3 as the activators were chosen to investigate the synergistic effects of the UK and YFC on the mechanical and durability properties of geopolymer concrete. 5 different geopolymer concrete groups were produced using fly ash and blast furnace slag at the rates of 100-0, 80-20%, 70-30%, 60-40%, and 50-50% as binders. As a result of the preliminary experiments, the produced geopolymer samples were cured at 90°C for 72 hours. The compressive strengths of 3, 7, 28, and 90 days of produced samples were determined. Within the scope of durability tests, 28 day’s samples were exposed to 4 different high-temperature effects such as 200°C, 400°C, 600°C, and 800°C. The compressive strengths, capillary water absorption coefficients, weight changes, and UPV values of the samples were determined after high temperatures. As the internal structure analysis, scanning electron microscopy (SEM) analysis was performed after the high-temperature effect. As a result, with the addition of slag in the production of fly ash-based geopolymer, the mechanical and durability properties of the concrete improved and it was obtained a denser microstructure. After the effect of high temperature, among all mixtures, the highest compressive strength results belong to the mixture containing 50% slag.

Keywords

• Geopolymer
• fly ash
• blast furnace slag
• elevated temperature
• capillary water absorption
• UPV
• SEM

Uçucu Kül Esaslı ve Cüruf Katkılı Geopolimer Betonların Mekanik ve Durabilite Özelliklerinin Araştırılması

Abstract

Bu çalışmada, uçucu kül (UK) ve yüksek fırın cürufunun (YFC) geopolimer betonların basınç dayanımı ve durabilite özellikleri üzerindeki sinerjik etkisini araştırmak için alümino-silikat kaynağı olarak UK ve YFC ve aktivatör olarak NaOH ve Na2SiO3 seçilmiştir. Bağlayıcı olarak %100-0, %80-20, %70-30, %60-40 ve %50-50 oranlarında uçucu kül ve yüksek fırın cürufu kullanılarak 5 geopolimer farklı beton grubu üretilmiştir. Yapılan ön deneyler neticesinde, geopolimer beton numunelere 90°C’de 72 saat ısı kürü uygulanmıştır. Üretilen numunelerin 3, 7, 28 ve 90 günlük basınç dayanımları tespit edilmiştir. Durabilite deneyleri kapsamında 28 günlük numuneler 200°C, 400°C, 600°C ve 800°C olmak üzere 4 farklı yüksek sıcaklık etkisine maruz bırakılmıştır. Yüksek sıcaklıktan sonra numunelerin basınç dayanımı, kılcal su emme katsayıları, ağırlık değişimleri ve ultrasonik ses hızları tespit edilmiştir. İçyapı analizi kapsamında yüksek sıcaklık etkisinden sonra SEM analizi yapılmıştır. Sonuç olarak uçucu kül esaslı geopolimer üretiminde cüruf eklenmesi ile betonun mekanik ve durabilite özellikleri gelişmiş ve daha yoğun bir mikroyapı elde edilmiştir. Yüksek sıcaklık etkisinden sonra tüm karışımlar içinde en yüksek basınç dayanım sonuçları %50 cüruf içeren karışıma aittir.

Keywords

• Geopolimer
• uçucu kül
• yüksek fırın cürufu
• yüksek sıcaklık
• kılcal su emme
• UPV
• SEM

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