Elevated Temperature Resistance of Mortars Including Ground Granulated Blast Furnace Slag, Fly ash and Silica Fume

Abstract

In the current study, elevated heat resistance of the mortars including 15% fly ash, ground granulated blast furnace slag and silica fume is investigated. Fly ash, ground granulated blast furnace slag and silica fume are replaced with cement past by weight in the prepared mortar samples. The prepared samples are kept in a furnace for 2 hours at 400 °C and 800 °C to find out effect of elevated temperature on compressive strength of the mortars. Compressive strength before and after heat exposure are measured in terms of evaluating elevated heat resistance. Control sample that does not contain any admixture, mortar including fly ash, mortar including ground granulated blast furnace slag and mortar including silica fume has 30.81 MPa, 33.62 MPa, 43.91 MPa and 51.83 MPa compressive strength before heat exposure, respectively. Compressive strength of the same samples after 400 °C and 800 °C heat exposure are 25.64 MPa and 8.12 MPa, 28.91 MPa and 11.56 MPa, 34.37 MPa and 15.21 MPa and 39.78 MPa and 21.85 MPa, respectively. The alteration of heat resistance of the mortars with fly ash, ground granulated blast furnace slag and silica fume is attributed to puzzoulanic behavior of the used materials. These materials react with Ca(OH)2 in cement and produce extra tobermorite gel (CSH phase) that provides extra durability to the composite.

Keywords

• Mortar
• Cement
• Elevated heat resistance

Öğütülmüş Yüksek Fırın Cürufu, Uçucu Kül ve Silika Dumanı İçeren Harçların Yüksek Sıcaklık Direnci

Öz

Bu çalışmada, %15 oranda uçucu kül, öğütülmüş yüksek fırın cürufu ve silis dumanı içeren harçların yüksek sıcaklığa karşı dirençleri araştırılmıştır. Hazırlanan harç numunelerinde uçucu kül, öğütülmüş yüksek fırın cürufu ve silis dumanı ağırlıkça çimento ile yer değiştirilmiştir. Yüksek sıcaklıkların harç basınç dayanımlarına etkisini bulmak için ürerilen numuneler 400 °C ve 800 °C'de 2 saat süreyle etüvde tutulmuştur. Harç numunelerinin yüksek sıcaklıklara maruz kalmadan önceki ve sonraki basınç dayanımları, harçların yüksek sıcaklık direnclerinin değerlendirilmesi için ölçülmüştür. Herhangi bir katkı maddesi içermeyen harç, uçucu kül içeren harç, öğütülmüş yüksek fırın cürufu içeren harç ve silis dumanı içeren harç, ısıya maruz kalmadan önce sırasıyla 30.81 MPa, 33.62 MPa, 43.91 MPa ve 51.83 MPa basınç dayanımlarına sahiptirler. Aynı numunelerin 400 °C ve 800 °C sıcaklığa maruz kaldıktan sonraki basınç dayanımları sırasıyla 25.64 MPa ve 8.12 MPa, 28.91 MPa ve 11.56 MPa, 34.37 MPa ve 15.21 MPa ve 39.78 MPa ve 21.85 MPa'dır. Uçucu kül, öğütülmüş yüksek fırın cürufu ve silis dumanı içeren harçların ısıl direncinin değişmesi, kullanılan malzemelerin puzzulanik davranışına bağlanmaktadır. Bu malzemeler çimentoda Ca(OH)2 ile reaksiyona girer ve kompozite ekstra dayanıklılık sağlayan ekstra tobermorit jeli (CSH fazı) üretir.

Anahtar Kelimeler

• Harç
• Çimento
• Yüksek sıcaklık direnci

Kaynakça

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