INVESTIGATION OF MECHANICAL, PHYSICAL AND ELECTRICAL PROPERTIES OF GRAPHENE OXIDE BLENDED MORTARS

Öz

In this study, mechanical, physical and electrical properties of graphene oxide-containing mortars at nano scale were investigated. Graphene oxide was added to the crushed-sandy mortars prepared at constant water / cement ratio and cement content at 0.0, 0.5, 1.0, 1.5 and 2.0%. After gaining the strengths of the mortars, mechanical properties such as compressive strength, splitting-tensile strength and point loading strength were determined. As physical properties, water absorption by weight, capillary water absorption, apparent porosity and bulk density were obtained. In addition, the electrical resistivity values of the mortars were determined at different frequency values (0.1, 1, 10 and 100 kHz). According to the results obtained, it was observed that mechanical properties were increased considerably (44% in the compressive strength) especially when 0.5% of graphene oxide was added into the mortar. The changes in the physical properties were only at a low level, but only in the increase of the capillary water absorption. Significant increases were also obtained in the electrical conductivity values of the mortars due to the structural nature of the graphene oxide.

Anahtar Kelimeler

• Graphene oxide,Nano-admixture,Cement based mortar

GRAFEN OKSİT KATKILI HARÇLARIN MEKANİK, FİZİKSEL VE ELEKTRİKSEL ÖZELİKLERİNİN ARAŞTIRILMASI

Öz

Bu çalışmada, nano ölçekte grafen oksit içeren harçların mekanik ve fiziksel özelikleri ile elektriksel özelikleri araştırılmıştır. Sabit su/çimento oranında ve çimento içeriğinde hazırlanan kırma-kumlu harçlara %0.0, %0.5 %1.0, %1.5 ve %2.0 oranlarında grafen oksit ilave edilmiştir. Harçlar dayanımlarını kazandıktan sonra, mekanik özelik olarak basınç dayanımları, yarmada çekme dayanımları ve noktasal yükleme dayanımları belirlenmiştir. Fiziksel özelikleri olarak, ağırlıkça su emme, kapiler su emme, görünen porozite ve hacim yoğunlukları bulunmuştur. Ayrıca harçların elektriksel özdirenç değerleri de farklı frekans değerlerinde (0.1, 1, 10 ve 100 kHz) belirlenmiştir. Elde edilen sonuçlara göre, özellikle %0.5 oranında grafen oksidin harç içerisine ilave edilmesi durumunda mekanik özelikleri önemli derecede (basınçta %44) arttırdığı gözlenmiştir. Fiziksel özeliklerdeki değişimler oldukça düşük düzeydeyken sadece kapileritenin artmasında etkili olmuştur. Grafen oksidin yapısal özeliğine bağlı olarak harçların elektriksel iletkenlik değerlerinde de önemli artışlar elde edilmiştir.

Anahtar Kelimeler

• Grafen oksit,Nano-katkı,Çimento esaslı harç

Kaynakça

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