Çimento Esaslı Harçlarda Faz Değiştiren Malzeme Tipinin Harcın Reolojik, Fiziksel ve Mekanik Özeliklerine Etkisinin Araştırılması

Öz

Yaşadığımız evrende iklim değişikliğine sebep olan sera gazlarının çevresel etkilerinin azaltılması için enerji verimli yapıların üretilmesi kaçınılmaz olmaktadır. Enerji tüketiminin büyük çoğunluğunu teşkil eden yapıların üretiminde kullanılan yapı malzemelerinde, binaların ısıtma ve soğutma yükünün azaltarak termal enerji depolamak için faz değiştiren malzeme kullanımı öne çıkmaktadır. Faz değiştiren malzemeler kapsüllenmiş ya da kapsülsüz olarak yapı malzemelerinin yalıtım ve ısı aktarım özelliklerini geliştirmek için kullanılabilmektedir. Bu çalışmada farklı tip faz değiştiren malzeme kullanım etkisini gözlemleyebilmek için belirli oranlarda (%0, %2,5, %5) nano-kapsüllenmiş ve kapsülsüz olmak üzere faz değiştiren malzemenin (FDM) iki farklı tipi çimento esaslı harca dahil edilerek etkisi araştırılmıştır. FDM katkılı harçların taze halde çökme-yayılması ve viskoziteleri belirlenirken, sertleşmiş harçlarda ultrases geçiş hızı, elektriksel özdirenç, basınç ve eğilme dayanımı değişimleri araştırılmıştır. Elde edilen bulgulara göre, faz değiştiren malzemenin harçlarda kullanılmasıyla fiziksel ve mekanik özeliklerde azalma görülmüş olup, bu azalma kapsüllü FDM kullanılan harçlarda daha fazladır.

Anahtar Kelimeler

• Faz değiştiren malzeme tipleri
• Nano-kapsül
• Çimento esaslı harç

Investigation of the Effect of Phase Change Material Type on Rheological, Physical and Mechanical Properties of Cement Based Mortars

Öz

It is inevitable to produce energy efficient structures in order to reduce the environmental effects of greenhouse gases that cause climate change in the universe we live in. In the construction materials used in the production of buildings, which constitute the majority of energy consumption, the use of phase-changing materials to store thermal energy by reducing the heating and cooling load of the buildings comes to the fore. Phase technology can be used to expand the capacity and heat dissipation of building materials, with or without encapsulation. In this study, in order to observe the effect of using different types of phase change materials, the effect was investigated by including two different types of phase change material (PCM), nano-encapsulated and non-encapsulated in certain proportions (0%, 2,5%, 5%) in cement based mortar. While the slump-spanning and viscosities of the mortars with PCM additives were determined in the fresh state, changes in ultrasound transmission velocity, electrical resistivity, compressive and flexural strength were investigated in hardened mortars. According to the findings, physical and mechanical properties were decreased with the use of phase change material in mortars, and this decrease was higher in mortars using encapsulated PCM.

Anahtar Kelimeler

• Types of phase change materials
• Nanocapsules
• Cementitious mortar

Kaynakça

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