Yüksek Fırın Cürufu, Kalsine Kaolin ve Diatomit İkameli Çimentoların Yapısal Özeliklerinin Eğilme Dayanımına Etkisi

Yıl 2024, , 400 - 418, 26.01.2024

Ayperi Tanık , Yılmaz Koçak

https://doi.org/10.29130/dubited.1257545

Öz

Çimento ve beton teknolojisinde tercih edilen yüksek fırın cürufu (YFC), kalsine kaolin ve diatomit gibi mineral katkıların kullanımı her geçen gün artmaktadır. Bu malzemelerin yapısal özelliklerine bağlı olarak, betonun dayanım ve dayanıklılığında olumlu değişikliklerin meydana geldiği belirtilmektedir. Bu bağlamda mineral katkıların fiziksel ve kimyasal özelliklerinin yanı sıra, mineralojik, moleküler, termal ve mikro yapı gibi özelliklerinin belirlenmesinin de faydalı olabileceği düşünülmektedir. Bu amaçla ilk aşamada Portland çimento (PÇ), YFC, kalsine kaolin ve diatomitin fiziksel, kimyasal, mineralojik, moleküler, termal ve mikro yapı gibi yapısal özellikleri belirlenmiştir. İkinci aşamada YFC, kalsine kaolin ve diatomit, PÇ yerine ağırlıkça %10 oranlarında ikame edilerek, biri referans olmak üzere toplam 4 tip çimento elde edilmiştir. Son aşamada ise bu çimentolarla üretilen harç numunelerinin 2, 7, 28 ve 90. günlerde eğilme dayanım değerleri belirlenmiştir. Sonuç olarak harç numunelerinin eğilme dayanım değerlerinin, hidratasyon sürelerine ve mineral katkıların yapısal özelliklerine bağlı olarak farklılık gösterdiği belirtilebilir. Ayrıca YFC ikameli çimento harcının 90. günde neredeyse referans çimentonun eğilme dayanım değerine sahip olduğu ve diğer puzolanik malzemelere göre eğilme dayanımı açısından nispeten daha olumlu katkı sağladığı ifade edilebilir.

Anahtar Kelimeler

Portland çimento, yüksek fırın cürufu, kalsine kaolin, diatomit, yapısal özellikler, eğilme dayanımı

Teşekkür

Yazarlar, standart çimento deneylerinin yapılmasında desteklerini esirgemeyen Eskişehir Çimento Fabrikası laboratuvar çalışanları ve idarecilerine içtenlikle teşekkür ederler.

Effect of Structural Properties of Blast Furnace Slag, Calcined Kaolin and Diatomite Substituted Cements on Flexural Strength

Öz

The use of mineral additives such as blast furnace slag (BFS), calcined kaolin and diatomite, which are preferred in cement and concrete technology, is increasing day by day. It is stated that positive changes occur in the strength and durability of concrete depending on the structural properties of these materials. In this context, besides the physical and chemical properties of mineral additives, it is thought that it may be useful to determine the properties such as mineralogical, molecular, thermal and microstructure. For this purpose, in the first stage, structural properties such as physical, chemical, mineralogical, molecular, thermal and microstructure of Portland cement (PC), BFS, calcined kaolin and diatomite were determined. In the second stage, a total of 4 types of cement, one of which is a reference, were obtained by substituting BFS, calcined kaolin and diatomite at 10% by weight instead of PC. At the last stage, the flexural strength values of the mortar samples produced with these cements were determined at the 2-day, 7-day, 28-day and 90-day. As a result, it can be stated that the flexural strength values of the mortar samples differ depending on the hydration times and the structural properties of the mineral admixtures. Furthermore, it can be stated that the cement mortar with BFS additives has values close to the flexural strength of the reference cement at 90-day, and provides a relatively more positive contribution in terms of flexural strength compared to other pozzolanic materials.

Anahtar Kelimeler

Portland cemen, blast furnace slag, calcined kaolin, diatomite, structural features, flexural strength

Kaynakça

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