Nano tipi ve granüle yüksek fırın cürufu ikame oranının çimento harçlarına olan etkisi

Yıl 2021, Cilt: 11 Sayı: 2, 482 - 496, 15.04.2021

Mem Çiftçi Serhat Demirhan

https://doi.org/10.17714/gumusfenbil.867858

Cited By: 1

Öz

Mevcut deneysel çalışmada, yüksek hacimde granüle yüksek fırın cürufu içeren harçların taze ve sertleşmiş özellikleri incelenmiştir. Bu amaçla, TS EN 197-1’e göre minimum şartları sağlayan ve %1, %2, %3 ve %4 ikame oranlarında nano kalsit, nano SiO2 ve nano Al2O3 ihtiva eden toplamda 58 karışım tasarlanmıştır. İlk olarak tüm karışımların 2, 7 ve 28. Günlerde mekanik özellikleri incelenmiş, daha sonra seçilen 8 karışım ile harmanlanmış çimento pastaları hazırlanarak standart kıvam suyu ve priz süreleri tespit edilmiştir. Test sonuçları, yüksek hacimlerde granüle yüksek fırın cürufu kullanımının erken yaş dayanım düşüşü ile neticelendiğini göstermiştir. Çekirdeklenme ve kimyasal etkinin bir sonucu olarak nano malzemelerin kullanıldığı karışımların priz sürelerinde kısalma ve erken yaş basınç dayanımı gelişimlerinde iyileşme gözlemlenmiştir. Nano malzeme ikame oranı artıkça basınç dayanımlarında kısmî de olsa bir düşüş gözlemlenirken dayanım gelişimine en yüksek katkının %1-2 arası ikame oranlarında gözlemlendiği tespit edilmiştir. Nano SiO2, Nano Al2O3 ve nano kalsit kullanımıyla hem çekirdeklenme hem de kimyasal etkinin bir netice olarak harçların performans özelliklerinde belirgin iyileşmeler saptanmıştır. %81 oranında granüle yüksek fırın cürufunun ikame edildiği CEM III-C tipli katkılı çimentolarda tüm nano tipleri için %1 nano malzeme kullanımıyla CEM III-C 32.5 elde edilmiştir.

Anahtar Kelimeler

Çimento harcı, Basınç dayanımı, Yüksek fırın cürufu, Nano malzeme, Priz süresi

Effect of nano type and slag replacement level on cement mortars

Öz

In the current experimental study, fresh and hardened properties of high-volume ground granulated blast furnace slag blended cements were investigated. For this purpose, fifty-eight cement mortars satisfying minimum requirements of TS EN 197-1 were produced and nano calcite, nano SiO2 and nano Al2O3 were replaced by the cement up to a replacement level of 4% (which were 1%, 2%, 3% and 4%). First of all, the mechanical properties of mixtures were examined at the curing ages of 2, 7 and 28 days and then standard consistency and setting times of eight selected mixtures were determined. Test results showed that increase in the replacement level of slag was resulted in decrease in early age compressive strength. As a result of both seeding (nucleation) and chemical effect, decrease in setting time and enhancement in early age strength development of mixtures including nanomaterials were observed. Even though increase in replacement of nanomaterials resulted in a slight decrease in compressive strength of the mixtures, the best enhancements were obtained with the replacement level of 1%. As a result of this, minimum requirements of CEM III-C 32.5 were achieved in the mortars including CEM III-C type cement with a slag replacement level of 81% and modified by 1% of nanomaterial.

Anahtar Kelimeler

Cement mortar, Compressive strength, Ground granulated blast furnace slag, Nanomaterial, Setting time

Kaynakça

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