Grafen oksit katkılı yeni nesil harçlarda dozaj ve doğru akım şiddetinin etkilerinin araştırılması

Yıl 2023, Cilt: 38 Sayı: 1, 421 - 434, 21.06.2022

İsmail Hocaoğlu

https://doi.org/10.17341/gazimmfd.940271

Cited By: 1

Öz

Çimento esaslı malzemelerde nano-metre boyutundaki malzemelerin kullanılması malzemelere yeni bir vizyon katmaktadır. Grafen oksit; sulu çözeltilerde iyi dağılabilirliği, yüksek özgül ağırlığı, iyi ısıl iletkenliği, esnek yapısı, yüksek görünüş oranı ve mükemmel mekanik özellikleri sayesinde çimento esaslı malzemelerde tercih edilmektedir. Bu çalışmada 250, 300, 350, 400 dozajlı ve su/çimento oranları 0,85 olarak tasarlanmış 4cm x 4cm x 16cm boyutunda harçlar üretilmiştir. Grafen oksit’ in harç fiziksel ve mekanik özelliklerine etkisini araştırmak amacıyla çimento yerine ağırlıkça % 0,025 GO konulan numuneler üretilmiştir. DC gerilimin etkisini araştırmak amacıyla 300 dozajlı harçlar taze halde iken DC güç kaynağı vasıtasıyla 24 saat süresince 15V, 20V, 25V ve 30V gerilime maruz bırakılmıştır. Çalışma kapsamında dozajın; priz bitiş süresine, eğilme dayanımına ve basınç dayanımına etkileri araştırılmıştır. Hidratasyon reaksiyonları başlangıcından itibaren harçların iç sıcaklık değerleri ve yüzeysel nem oranları dakikada bir ölçülmüştür. Harçların fiziksel ve mekanik özelliklerini iyileştirme açısından en uygun dozajın 300 olduğu, en uygun gerilim şiddetinin ise 25V olduğu sonucuna varılmıştır. Harçlara GO konulduğunda harçların iç sıcaklık değerlerinin arttığı, fiziksel ve mekanik özelliklerinin iyileştiği belirlenmiştir. Harçlarda yüzeysel nem oranı ölçülmesi ile priz bitiş süresinin tahmin edilebileceği belirlenmiştir. Çimento yerine hem GO konulması hem de 25V DC gerilim şiddeti uygulanması ile harçların mikro yapısında fark edilir iyileşme gözlenmiştir.

Anahtar Kelimeler

Harç, Grafen Oksit, DC akım, İç sıcaklık, Yüzeysel nem

Investigation of the effects of dosage and direct current intensity in new generation mortars with graphene oxide additives

Öz

The use of nano-meter-sized materials in cement-based materials adds a new vision to the materials. Graphene oxide; is preferred in cement-based materials thanks to its good dispersibility in aqueous solutions, high specific gravity, good thermal conductivity, flexible structure, high aspect ratio, and excellent mechanical properties. In this study, mortars with 250, 300, 350, and 400 dosages and a water/cement ratio of 0.85 were produced whose sizes are 4cm x 4cm x 16cm. In order to investigate the effect of graphene oxide on the physical and mechanical properties of mortar, samples containing 0.025 % GO were produced instead of cement. In order to investigate the effect of DC current on 300 dosage mortars; 15V, 20V, 25V, and 30V, stress intensities were applied for 24 hours through the DC power source while the mortars were in a fresh situation. Within the scope of the study, the effects of the dosage on final setting time, flexural strength, and compressive strength were investigated. From the beginning of the hydration reactions, the mortars' internal temperature and surface moisture were measured once per minute. It was concluded that the optimum dosage is 300 in terms of improving the physical and mechanical properties of the mortars, and the optimum stress intensity is 25V. It was determined that when GO was added to the mortars, the internal temperature values of the mortars increased, and their physical and mechanical properties improved. It has been determined the final setting time can be predicted by measuring the surface moisture in mortars. A noticeable improvement was observed in the microstructure of the mortars with the addition GO and the application of 25V DC stress intensity.

Anahtar Kelimeler

Mortar, Graphene Oxide, DC current, Internal temperature, Superfical moisture

Kaynakça

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