Farklı pH Çözeltileri ve Donma Çözülmenin Travertenlerin Fiziko-Mekanik Özelliklerine Birlikte Etkisi

Year 2021, Issue: 32, 1 - 6, 31.12.2021

Engin Özdemir

https://doi.org/10.31590/ejosat.1039246

Abstract

Traverten, blok verme, çeşitli desenlere sahip olma ve kolay işlenebilir olmasından dolayı inşaat malzemesi olarak oldukça yaygın bir kullanım alınana sahiptir. Fakat porozite açısından diğer doğal taşlara nazaran daha boşluklu yapılara sahip olması en büyük dezavantajıdır. Bu durum, travertenlerin dış mekânlarda kullanım alanlarını oldukça kısıtlamaktadır. Özellikle, çok yağış alan ve donma-çözünme olaylarının fazla göründüğü ortamlarda bu tür doğal taşların kullanımı önerilmemektedir. Birçok araştırmacı donma çözünmenin travertenlere etkisini araştırırken su ile doygun hale getirmiştir ve suyun asidik-bazik özelliklerini incelememişlerdir. Bu çalışmada, donma çözünmenin farklı pH çözeltilerine (2.0, 7.0 ve 12.0) maruz bırakılarak birlikte etkisi ele alınmıştır. Bu amaçla, Malatya kırmızı traverten ve Erzurum traverten üç farklı çözelti kullanılarak 20 kez donma-çözünmeye maruz bırakıldı ve her 5 döngü sonunda tek eksenli basınç dayanımı, P dalga hızı ve Schmidt çekici sertlik değerleri tayin edildi. Çalışma sonucunda, pH değeri azaldıkça ve donma çözünme döngü sayıları arttıkça travertenlerin tek eksenli basınç, P dalga hızı ve Schmidt çekici sertliğindeki düşüş artmıştır.

Keywords

Doğal taşlar, P dalga hızı, pH, Tek eksenli basınç dayanımı, Traverten

The Combined Effect of Different pH Solutions and Freeze-Thaw on Physico-Mechanical Properties of Travertines

Abstract

Travertine is widely used as a construction material due to gives blocks, various patterns and easy to process. However, its biggest disadvantage is that it has a more porous structure than other natural stones. This situation restricts the outdoor usage areas of travertines. Especially, in environments that receive heavy rainfall and freeze-thaw events, the use of such natural stones is not recommended. Many researchers, while investigating the effect of freeze-thaw on travertines, saturated with water and did not determine acidic-basic properties of water. In this study, combined effect of freeze-thaw by exposure to different pH (2.0, 7.0 and 12.0) solutions is investigated. For this purpose, Malatya red travertine and Erzurum travertine were exposed to freeze-thaw 20 times using three different solutions and at the end of every 5 cycles, uniaxial compressive strength, P wave velocity and Schmidt hammer hardness values were determined. As a result of the study, the decrease in uniaxial compressive strenght, P wave velocity and Schmidt hammer hardness of travertines increased as pH value decreased and freeze-thaw cycle numbers increased.

Keywords

Natural stones, P wave velocity, pH, Uniaxial compressive strength, Travertine

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