The Effect of Boric Acid on Mechanical Properties and Structural Characterization of Self-Compacting Concrete

Abstract

Within the scope of this thesis, it is aimed to produce boric acid doped Self-Compacting Concrete (SCC) to be used especially in other buildings that are exposed to nuclear power plants and radiation. Within this scope, a reference sample without boric acid and which fulfils the conditions of being SCC was produced, and 0.5%, 1.0%, 1.5%, 2.0%, 2.5% boric acid was added to concrete water respectively by weight in addition to the reference sample design. Freshly Mixed Concrete Flow Table Test, V-Funnel, L Shape Box, U Shape Box Tests were performed on these samples in order to observe whether there was a change in the conditions of being SCC. Compressive strength and flexural strength tests were performed in order to compare the change in mechanical properties of obtained samples. Also, SEM and XRD analyses were carried out in order to observe the structural characterization changes. As a result of the studies, it was observed that boric acid doped concretes had the characteristics of Self-Compacting Concrete, compressive strength increased compared to reference sample, flexural strength decreased, porous structure in material decreased compared to reference sample.

Keywords

• Self-Compacting Concrete,, Boric Acid,,Sem,Xrd

Borik Asidin Kendiliğinden Yerleşen Betonun Mekanik Özellikleri ve Yapısal Karakterizasyonuna Etkisi

Öz

Bu çalışma kapsamında, özellikle nükleer santraller ve radyasyona maruz olan diğer yapılarda kullanılabilecek borik asit katkılı Kendiliğinden Yerleşen Beton (KYB)ların üretilmesi amaçlanmıştır. Bu kapsamda, KYB olma şartlarını sağlayan ve borik asit ilavesiz bir referans numune üretilmiş olup, oluşturulan referans numune dizaynına ilave olarak beton suyuna ağırlıkça sırasıyla %0.5, %1.0, %1.5, %2.0, %2.5 borik asit ilave edilerek numuneler oluşturulmuştur. Bu numuneler üzerinde KYB olma şartlarında değişim olup olmadığını gözlemlemek için Taze Beton Deneylerinden Yayılma Tablası, V-Hunisi, L-Kutusu, U-Kutusu deneyi yapılmıştır. Elde edilen numunelerin mekanik özelliklerindeki değişimi kıyaslamak için basınç dayanımı ve eğilme dayanımı deneyleri yapılmıştır. Ayrıca yapısal karakterizasyon değişimlerini gözlemlemek içinde SEM ve XRD analizleri yapılmıştır. Yapılan çalışmalar neticesinde borik asit katkılı betonların Kendiliğinden Yerleşen Beton olma özelliği taşıdığı, basınç dayanımının referans numuneye oranla arttığı, eğilme dayanımının azaldığı, referans numuneye kıyasla malzemedeki gözenekli yapının azaldığı gözlemlenmiştir.

Anahtar Kelimeler

• Knediliğinden Yerleşen Beton,Borik Asit,Sem,Xrd

Kaynakça

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