The Effect of Aggregate Type on Geopolymer Concrete High Temperature Resistance

Öz

Concrete is the most used building material in the world. However, during producing cement, a high amount of energy is consumed, and excessive carbon dioxide emissions are made. The production of alternative binders to the Portland cement has been studied for a long time. Geopolymers are materials that have the potential to be an alternative to the cement. It is well-known that geopolymers have a good high temperature resistance. However, the high temperature resistance of both conventional and geopolymer concretes is significantly affected by the type and properties of the aggregate. In this study, the resistance of geopolymer concretes produced by using limestone, river, basalt and slag aggregates to 600 and 900°C temperatures was determined by comparing their compressive strength losses. The geopolymer concrete produced with limestone aggregate was completely decomposed up on exposure to 900°C. However, the counterpart concretes produced with river, basalt and slag aggregates lost 32.9, 48.5 and 53.6% of their compressive strength, respectively.

Anahtar Kelimeler

• Geopolymer
• High temperature resistance
• Aggregate type

Agrega Türünün Geopolimer Betonun Yüksek Sıcaklık Direncine Etkisi

Öz

Beton, dünyada en çok kullanılan yapı malzemesidir. Ancak çimento üretimi sırasında yüksek miktarda enerji tüketilmekte ve karbondioksit salımı yapılmaktadır. Çimentoya alternatif bağlayıcıların üretilmesi, uzun süredir üzerinde çalışılan bir konudur. Geopolimerler, çimentoya alternatif olma potansiyeli taşıyan malzemelerdir. Geopolimerlerin iyi bir yüksek sıcaklık direncine sahip oldukları bilinmektedir. Ancak hem geleneksel hem de geopolimer betonların yüksek sıcaklık dirençleri, kullanılan agreganın türü ve özelliklerinden önemli ölçüde etkilenmektedir. Bu çalışmada kireçtaşı, dere, bazalt ve cüruf agregaları kullanılarak üretilen geopolimer betonların 600 ve 900°C yüksek sıcaklık etkisine karşı dirençleri basınç dayanımı kayıpları kıyaslanarak tespit edilmiştir. 900°C sıcaklık etkisinde, kireçtaşı ile üretilen geopolimer beton tamamen parçalanırken dere, bazalt ve cüruf agregaları ile üretilen betonların %32.9, 48.5 ve 53.6 oranında basınç dayanımı kaybına uğradıkları tespit edilmiştir.    

Anahtar Kelimeler

• Geopolimer
• Yüksek sıcaklık direnci
• Agrega türü

Teşekkür

Malzeme teminindeki yardımlarından ötürü Kılıçlar A.Ş’ye teşekkürlerimizi sunarız.

Kaynakça

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