EPS İle İkame Edilmiş Uçucu Küllü Geopolimer Hafif Harcın Fiziksel, Mekanik ve Isıl Geçirimlilik Özelliklerinin İncelenmesi

Bu çalışmada genleştirilmiş polistiren (EPS) kullanılarak uçucu kül tabanlı geopolimer hafif harçlar imal edilmiştir. EPS hacimce %20, %40, %60, %80, %100 oranlarında ırmak kumu ile yer değiştirerek, EPS agregalı geopolimer harçların üretimi gerçekleştirilmiştir. EPS’li geopolimer harçlar, F sınıfı uçucu külün sabit oranda NaOH ile aktive edilmesiyle, 75 °C’de 24 ve 48 saat sıcaklık kürüne tabii tutulmuştur. Sıcaklık kürü sonrası geopolimer hafif harç numunelerin fiziksel özellikleri, mekanik özellikleri ve ısıl geçirimlilik özellikleri araştırılmıştır. Ayrıca 300 °C, 600 °C, 900 °C’de yüksek sıcaklık sonrası geopolimer harçların eğilme, basınç dayanımları ve geopolimer hamurların mikro yapısı incelenmiştir. Elde edilen sonuçlara göre 24 saat sıcaklık kürüne tabii tutulan hafif geopolimer harçların birim ağırlıkları 1,93 ile 0,61 g/cm3 arasında, 48 saat sıcaklık kürüne tabii tutulan hafif geopolimer harçların birim ağırlıkları 1,87 ile 0,66 g/cm3 arasında olduğu görülmüştür. Yüksek sıcaklık sonrası %20 ve %40 EPS ikameli (EUK 20, EUK40) geopolimer harçların basınç dayanımındaki kayıp oranları, referans geopolimer numuneye göre daha az olduğu belirlenmiştir. FESEM görüntülerinde yüksek sıcaklık sonrası dayanım kaybına yol açan gözenekli yapı ve mevcut dayanımı devam ettiren NASH jeli yapısı görüntülenmiştir. Birim ağırlık ile basınç dayanımı (R2=0,9008), ısı geçirgenlik katsayısı (R2=0,9787), ultrasonik geçiş hızı (R2=0,9082), ve yarmada çekme dayanımı (R2=0,9191) arasında yüksek oranda doğrusal ilişki olduğu sonucuna ulaşılmıştır.

Investigation of Physical, Mechanical and Thermal Conductivity Properties of Fly Ash Geopolymer Lightweight Mortar Substituted with EPS

In this study, fly ash-based geopolymer light mortars were produced using expanded polystyrene (EPS). EPS aggregated geopolymer mortars were produced by replacing the river sand with 20%, 40%, 60%, 80%, 100% by volume. Geopolymer mortars with EPS were subjected to a temperature heat curing at 75 ° C for 24 and 48 hours by activating the F class fly ash with NaOH at a fixed rate. Physical properties, mechanical properties, and thermal conductivity properties of geopolymer lightweight mortar samples after heat curing were investigated. In addition, the flexural, compressive strength of geopolymer mortars after high temperatures at 300 ° C, 600 ° C, 900 ° C, and the microstructure of geopolymer pastes were investigated. According to the results, the unit weights of light geopolymer mortars subjected to 24 hours of heat curing are between 1.93 and 0.61 g/cm3, and the unit weights of light geopolymer mortars subjected to 48 hours of heat curing are between 1.87 and 0.66 g/cm3 has been seen. The compressive strength loss of geopolymer mortars with 20% and 40% EPS replacement (EUK 20, EUK40) after the high temperature was determined to be less than the reference geopolymer sample. The porous structure that causes loss of strength after high temperature and NASH gel structure that maintains the existing strength are displayed in FESEM images. Highly linear between unit weight and compressive strength (R2 = 0.9191), heat transmission coefficient (R2 = 0.9787), ultrasonic transmission velocity (R2 = 0.9082), and split tensile strength (R2 = 0.9191) It has been concluded that there is a relationship.

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