Investigation of Engineering Properties of Cement-Based Mortars Produced with Recycled Geopolymer Aggregates

Yıl 2023, Cilt: 13 Sayı: 2, 235 - 247, 29.12.2023

Şevin Ekmen , Zeynep Algın

Öz

The use of recycled aggregate obtained from construction waste has a very important place instead of the natural aggregate used at high rates in the production of building materials. While the recycling of Portland cement-based materials as recycled aggregates has been widely investigated, the reuse of geopolymers has not been sufficiently focused. Within the scope of this study, it is aimed to reuse the waste states of geopolymer composites, which were produced by disabling the use of cement. 12 different cement-based mortar mixtures were produced by using recycled geopolymer aggregates (RA) in 3 different ratios as 0%, 50% and 100% and basalt fiber at 0%, 0.2%, 0.4% and 0.6% ratios. It was aimed to determine the fresh properties of the produced mortar mixtures by spreading diameter and unit weight tests, and to determine the hardened properties by compressive strength, flexural strength, water absorption and capillary water absorption tests. While the recycled geopolymer aggregate decreased the unit weight values, it caused a significant increase in the water absorption values. The use of basalt fiber above 0.4% for all blends caused a decrease in compressive strength values. The highest compressive strength value was obtained for the 0.2% basalt fiber content in the sample without recycled aggregate replacement. While the flexural strength values of the control mixtures increased depending on the increase in the fiber content, the highest flexural strength value was reached with the basalt fiber ratio of 0.2% for the mortars containing RA.

Anahtar Kelimeler

Basalt Fiber, Aggregate of Recycled Geopolymer, Cement mortar, Properties of Fresh and Hardened Mortar

Geri Dönüştürülmüş Geopolimer Agregaları ile Üretilen Çimento Esaslı Harçların Mühendislik Özelliklerinin Araştırılması

Öz

Yapı malzemeleri üretiminde yüksek oranlarda kullanılan doğal agrega yerine inşaat atıklarından elde edilen geri dönüştürülmüş agrega kullanımı oldukça önemli bir yere sahiptir. Portland çimentosu bazlı malzemelerin geri dönüştürülmüş agregalar olarak geri dönüşümü yaygın olarak araştırılırken, geopolimerlerin yeniden kullanımına çok az odaklanılmıştır. Bu çalışma kapsamında çimento kullanımı devre dışı bırakılarak üretimi gerçekleştirilen geopolimer kompozitlerin atık hallerinin tekrar değerlendirilmesi amaçlanmıştır. %0, %50 ve %100 olmak üzere 3 farklı oranda geri dönüştürülmüş-geopolimer agregası (GDA) ikamesi ve %0, %0.2, %0.4 ve %0.6 oranlarında bazalt lif kullanımı ile 12 farklı çimentolu harç karışımı üretilmiştir. Üretilen harç karışımlarının yayılma çapı ve birim ağırlık deneyleri ile taze özelliklerinin, basınç dayanımı, eğilme dayanımı, su emme ve kılcal su emme deneyleri ile ise sertleşmiş özelliklerinin belirlenmesi hedeflenmiştir. GDA birim ağırlık değerlerini düşürürken, su emme değerlerinde belirgin bir artışa neden olmuştur. Tüm karışımlar için %0.4 oranının üzerinde bazalt lif kullanımı basınç dayanımı değerlerinde düşüşe neden olmuştur. En yüksek basınç dayanım değerine %0.2 bazalt lif oranı için, geri dönüştürülmüş agrega ikamesi yapılmamış numunede ulaşılmıştır. Kontrol karışımları için lif oranının artışına bağlı olarak eğilme dayanım değerleri artış gösterirken GDA içeren harçlarda en yüksek eğilme dayanım değerine %0.2 bazalt lif oranı ile ulaşılmıştır.

Anahtar Kelimeler

Bazalt lif, Geri-dönüştürülmüş Geopolimer Agregası, Çimento Harcı, Taze ve Sertleşmiş Harç Özellikleri

Kaynakça

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