Lif takviyeli pirinç kabuğu külü ikameli beyaz çimentolu harçların bazı mekanik özelliklerinin incelenmesi

Bu çalışmada Beyaz Çimento (PC CEM I 52.5 R) ile pirinç kabuğu külünün ikamesi (ağırlıkça %5, %15 ve %25 oranında) araştırılmıştır. Bu şekilde CO2 salınımı azaltılması ve maliyetin düşürülmesi amaçlanırken mekanik özellikler de araştırılmıştır. Ayrıca en yüksek dayanıma sahip %15 oranında pirinç kabuğu külü ikameli çimento harçlarında polivinil alkol (PVA) ve bazalt (B) lifleri hacimce %0.5, %1 ve %1.5 oranında kullanılmıştır. Bu şekilde üretilen 10 serinin 7 ve 28 günlük basınç ve eğilme dayanımı sonuçları incelenmiştir. Ayrıca yüksek sıcaklık etkisini görmek için 200, 400 ve 600 °C sıcaklıklar uygulanmıştır. Yüksek sıcaklık sonrası basınç ve eğilme dayanımı ve ağırlık kayıpları bulunurken oluşan görsel durum incelenmiştir. Ayrıca yüksek sıcaklık öncesi ve sonrası Mikro Bilgisayarlı Tomografi (Micro-CT) analizleri yapılmıştır. 7 ve 28 günlük sonuçlar incelendiğinde %15 oranında pirinç kabuğu külü ikamesine kadar dayanım artışı görülmüştür. Puzolanik özellik gösteren pirinç kabuğu külü bu oranda kullanılmasıyla çimentolu sistemlerde oluşturduğu fiziko-kimyasal etkisi sebebi ile dayanım özellikleri üzerinde artış oluşturmaktadır. Yüksek SiO2+Al2O3 oranına (%81.27) sahip puzolan içeren çimento harcında uzun dönemli dayanım da artış göstermektedir. Kısa dönemde ise doğal puzolanın özgül yüzey alanı (incelik) dayanım açısında birinci derecede etkili olmaktadır. Daha yüksek oranda kullanılmasıyla ise işlenebilirliğin düşmesi mekanik özellikleri azaltmıştır. Liflerin kullanılmasıyla eğilme dayanımında sürekli artış olmuştur. Basınç dayanımı sonuçları ise %1 oranına kadar artış gösterirken daha yüksek oranda kümelenme nedeniyle azalış olmuştur. Yüksek sıcaklıklardan sonra tahribatlar nedeniyle dayanım değerlerinde düşüş oluşmuş fakat kayıplara rağmen çimento harçları stabilitesini korumuştur.

Investigation of some mechanical properties of fiber-reinforced rice husk ash substituted white cement mortars

In this study, the substitution of rice husk ash (5%, 15% and 25% by weight) with White Cement (PC CEM I 52.5 R) was investigated. In this way, it is aimed to reduce CO2 emission and decrease the cost, while the mechanical properties have also been investigated. In addition, polyvinyl alcohol (PVA) and basalt (B) fibers were used at the rate of 0.5%, 1% and 1.5% by volume in the cement mortar with 15% rice husk ash substitution, which has the highest strength. The 7 and 28 days compressive and flexural strength results of 10 series produced in this way were examined. In addition, temperatures of 200, 400 and 600 °C were applied to see the high temperature effect. While determining the compressive and flexural strengths and weight loss after high temperature, the resulting visual situation was examined. In addition, Micro-Computed Tomography (Micro-CT) analyzes were performed before and after high temperature. When the results of 7 and 28 days were examined, an increase in strength was observed up to 15% rice husk ash substitution. The use of pozzolanic rice husk ash at this rate increases the strength properties due to the physico-chemical effect it creates in cement systems. Long-term strength also increases in cement mortar containing pozzolan with high SiO2+Al2O3 ratio (81.27%). In the short term, the specific surface area (fineness) of the natural pozzolan is primarily effective in terms of strength. With a higher rate of use, the decrease in workability decreased the mechanical properties. There has been a continuous increase in flexural strength with the use of fibers. While the compressive strength results increased by up to 1%, there was a decrease due to higher rate of clustering. After high temperatures, there was a decrease in the strength values due to destructions, but the cement mortar stability was preserved despite the losses.

Keywords:

White cement, rice husk ash, PVA fiber, basalt fiber, high-temperature micro-CT,

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