Effect of Jute Fibers Surface Improved with Graphene Oxide on Mechanical Properties and Drying Shrinkage Behavior of Mortar Mixtures

Öz

Fibers are generally added to mixtures to improve the mechanical properties of cementitious systems and to provide ductility. Natural fibers are preferred due to their lower production cost, lower carbon emission and fossil fuel consumption, biodegradability, lower density and ease of manufacturing, and less environmental impact. On the other hand, graphene-derived materials have been proven to have an improving effect on fiber-matrix mechanical and interface properties. Within the scope of this study, the effects of jute fibers subjected to surface improvement with graphene-oxide (GO) on the workability of mortar mixtures, compressive strength, flexural strength, water absorption and drying-shrinkage performances were investigated. Within the scope of the experimental study, in addition to the control mixture without fibers, GO coated and uncoated jute fibers with lengths of 0.5 and 1 cm were added to the mixture at 0.1, 0.3 and 0.5% of the total volume to prepare different fiber mortar mixtures. According to the experimental results, the need for water-reducing admixture increased in mixtures containing fibers. Adding 0.5 cm and 0.1% fiber to the mixtures increased the compressive and flexural strengths. GO coating provided a slight increase in strength compared to uncoated fibers. Water absorption ratios were inversely proportional to compressive strength. Adding fibers reduced the drying-shrinkage amounts. GO-coated fibers were more effective in this case. However, GO-coated fiber contents greater than 0.1% caused an increase in drying-shrinkage.

Anahtar Kelimeler

• Jute fiber
• Mortar mixtures
• Compressive strength
• Flexural strength
• Drying shrinkage

GRAFEN OKSİT İLE YÜZEY İYİLEŞTİRME YAPILMIŞ JÜT LİFLERİN HARÇ KARIŞIMLARIN MEKANİK ÖZELLİKLERİ VE KURUMA BÜZÜLME DAVRANIŞINA ETKİSİ

Öz

Çimentolu sistemlerin mekanik özelliklerini iyileştirebilmek ve süneklik kazandırmak amacı ile genellikle karışımlara lif ilave edilmektedir. Doğal liflerin üretim maliyetinin daha düşük olması, daha az karbon emisyonu ve fosil yakıt tüketimi, biyolojik olarak parçalanabilirlik, daha düşük yoğunluk ve imalat kolaylığı gibi çevresel etkilerinin daha az olması nedeniyle tercih edilmektedir. Diğer yandan, grafen türevi malzemelerin, lif-matris mekanik ve arayüz özelliklerini iyileştirici bir etki gösterdiği kanıtlanmıştır. Bu çalışma kapsamında, grafen-oksit (GO) ile yüzey iyileştirme işlemine tabi tutulan jüt liflerinin harç karışımlarının işlenebilirliğine, basınç dayanımı, eğilme dayanımı, su emme ve kuruma-büzülme performanslarına etkisi araştırılmıştır. Deneysel çalışma kapsamında lif içermeyen kontrol karışımına ilaveten, 0,5 ve 1 cm uzunluğuna sahip GO kaplamalı ve kaplamasız jüt lifler toplam hacmin %0,1, 0,3 ve 0,5 oranlarında karışıma ilave edilerek farklı lifli harç karışımları hazırlanmıştır. Deney sonuçlarına göre lif içeren karışımlarda su azaltıcı katkı ihtiyacı artmıştır. Karışımlara 0,5 cm ve %0,1 lif ilave edilmesi basınç ve eğilme dayanımlarını artırmıştır. GO kaplama yapılması kaplamasız liflere kıyasla dayanımların bir miktar artmasını sağlamıştır. Su emme oranları basınç dayanımı ile ters orantı göstermiştir. Lif ilave edilmesi kuruma-büzülme miktarlarını düşürmüştür. GO kaplama yapılan lifler bu durumda olumlu yönde daha etkili olmuştur. Ancak GO kaplı lif içeriklerinin %0,1’den fazla olması kuruma-büzülmelerin artmasına neden olmuştur.

Anahtar Kelimeler

• Jüt lif
• Harç karışımlar
• Basınç dayanımı
• Eğilme dayanımı
• Kuruma büzülme

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