Fiber takviyesi ile killi zeminlerin kıvam limitlerinde meydana gelen değişimler

Year 2024, Volume: 14 Issue: 2, 582 - 591, 15.06.2024

Yasemin Aslan Topçuoğlu , Zülfü Gürocak

https://doi.org/10.17714/gumusfenbil.1425830

Abstract

Killerin mühendislik özelliklerinin iyileştirilmesi amacıyla kullanılan birçok yöntem bulunmaktadır. Bu geleneksel yöntemlere son yıllarda kullanımı giderek yaygınlaşan fiber ile güçlendirme yöntemi de eklenmiştir. Geleneksel yöntemlere göre birçok avantaja sahip olan bu yöntemde daha çok bazalt, cam, polipropilen gibi fiber türleri kullanılmakta ve dolguda kullanılan zeminlerin mühendislik özellikleri iyileştirilebilmektedir. Zemin güçlendirmede fiber kullanımının son zamanlarda mühendislik uygulamalarında yoğun bir şekilde kullanılmaya başlanması ile birlikte, bu konuda yapılan bilimsel çalışmalarda da önemli bir artış söz konusudur. Fiber takviyesi kullanılarak bugüne kadar yapılan çalışmalarda çoğunlukla zeminin dayanımında, şişme özelliklerinde meydana gelen değişimler incelenmiştir. Ancak zeminin kıvam limitleri üzerinde fiberin etkisinin incelendiği çalışma oldukça azdır. Kıvam limitlerindeki değişim zemin stabilizesi üzerinde etkili olduğundan fiber takviyesiyle meydana gelen değişimlerin belirlenmesi oldukça önemlidir. Fiber kullanımı sonucunda fiber–zemin etkileşimlerinin, zeminin jeoteknik özelliklerinde meydana gelen değişimlerin ve bu değişimlerdeki mekanizmanın anlaşılabilmesi için daha fazla bilimsel çalışmaya ve veri tabanına ihtiyaç vardır. Bu çalışmada, kaolin kiline farklı oranlarda bazalt fiber takviyesiyle likit ve plastik limit değerlerinde meydana gelen değişimler incelenmiştir. Bu amaçla kaolin kiline % 0.25, 0.50, 1.00, 1.50, 2.00, 2.50 ve 3.00 oranlarında 24 mm uzunluğa sahip bazalt fiber eklenerek hazırlanan kil örneklerinin likit limit, plastik limit ve plastisite indisi değerlerinde meydana gelen değişimler incelenmiştir. Çalışmanın sonuçlarına göre, bazalt fiber takviyesi ile kaolin kilinin likit limit değerlerinde azalma, plastik limit değerlerinde ise artış meydana gelmiştir. Takviyeli kaolin kilinde likit limitte en fazla azalmanın, plastik limitte ise en fazla artışın meydana geldiği bazalt fiber oranı ise % 2.00 olarak belirlenmiştir. Likit ve plastik limit değerlerinde meydana gelen bu değişimler sonucunda kaolin kilinin plastisite indisinde de azalma meydana gelmiş ve bu azalmaya bağlı olarak kaolin kili daha stabil hale gelmiştir.

Keywords

Bazalt fiber, Kaolin kili, Kıvam limitleri, Zemin güçlendirme

Changes in the consistency limits of clay soils with fiber reinforcement

Abstract

There are many methods used to improve the engineering properties of clays. Fiber reinforcement method, which has become increasingly common in recent years, has also been added to these traditional methods. In this method, which has many advantages over traditional methods, fiber types such as basalt, glass and polypropylene are used and the engineering properties of the soils used in the filling can be improved. With the use of fiber in soil reinforcement being used intensively in engineering applications recently, there is also a significant increase in scientific studies on this subject. In the studies carried out so far using fiber reinforcement, changes in the strength and swelling properties of the soil have mostly been examined. However, there are very few studies examining the effect of fiber on the consistency limits of the soil. Since the change in consistency limits affects soil stability, it is very important to determine the changes that occur with fiber reinforcement. More scientific studies and databases are needed to understand the fiber-soil interactions, changes in the geotechnical properties of the soil and the mechanism of these changes as a result of fiber use. This study examined changes in liquid and plastic limit values by adding different amounts of basalt fiber to kaolin clay. For this purpose, the changes in the liquid limit, plastic limit and plasticity index values of the clay samples prepared by adding 24 mm long basalt fiber to kaolin clay at the rates of 0.25, 0.50, 1.00, 1.50, 2.00, 2.50 and % 3.00 were examined. According to the results of the study, with basalt fiber reinforcement, there was a decrease in the liquid limit values of kaolin clay and an increase in the plastic limit values. The basalt fiber ratio with the highest decrease in the liquid limit and the highest increase in the plastic limit in reinforced kaolin clay was determined as 2.00 %. As a result of these changes in liquid and plastic limit values, the plasticity index of kaolin clay decreased and due to this decrease, kaolin clay became more stable.

Keywords

Basalt fiber, Kaolin, Consistency limit, Soil reinforcement

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