Investigation of the Shear Strength of Kaolin Clay Reinforced with PPF Fibers and PET Flakes

Year 2023, Volume: 13 Issue: 2, 266 - 275, 29.12.2023

Hüseyin Suha Aksoy Atakan Yıldırım

Abstract

The shear resistance of the soil plays an important role in the design of the foundation of a structure to be built. In civil engineering, existing soils are expected to be capable of bearing structural loads. However, sometimes weak soils that cannot carry the load of the building can be encountered. Therefore, it is necessary to improve the engineering properties of such soils.
In this study, the strength of kaolin, a clay with low plasticity, was investigated in the laboratory using Polypropylene (PPF) fibers and Polyethylene Terephthalate (PET) flakes. While PPF fibers were preferred due to their low cost and durability, PET flakes were preferred because they are both economical and reduce the volume of solid waste that is increasing day by day. For this purpose, by adding 0%, 0.5%, 1.0%, 1.5%, 2.0% PPF fibers and PET flakes by weight to kaolin clay, optimum water content (wopt) and max. dry unit volume weights (γkmax) were determined. Uniaxial compression tests were carried out on the samples prepared in Proctor density. As a result of the experiments, it was determined that there was a significant increase in the strength of the reinforced kaolin clay. According to the test results performed on the samples prepared with optimum water content and Proctor density, the unconfined compressive strength of kaolin clay with 2.0% PPF increased by 116% compared to the pure kaolin clay samples. On the other hand, unconfined compressive strength increased by 36% in kaolin clay improved with PET additive at the same rate.

Keywords

Clay soil, Polyethytilene tereftalat flakes, Polyproplene fibers, Soil improvement

PPF Lifi ve PET Talaşı ile Güçlendirilmiş Kaolin Kilinin Kayma Mukavemetinin İncelenmesi

Abstract

Zeminin kayma mukavemeti, inşa edilecek bir yapının temelinin tasarımında önemli bir rol oynar. İnşaat mühendisleri mevcut zeminlerin, yapı yükünü taşıyabilecek durumda olmasını beklerler. Ancak zaman zaman yapı yükünü taşıyamayan zayıf zeminler ile karşılaşılmaktadır. Bu nedenle bu tür zeminlerin mühendislik özelliklerinin iyileştirilmesi gerekmektedir.
Bu çalışma kapsamında, düşük plastisiteli bir kil olan kaolin kilinin mukavemeti, Polipropilen Elyaf (PPF) lifleri ve Polietilen Tereftalat (PET) talaşları kullanılarak laboratuvar ortamında arttırılmaya çalışılmıştır. PPF lifleri düşük maliyeti ve dayanıklılığından dolayı, PET talaşları ise hem ekonomik olması hem de gün geçtikçe artan katı atık hacminin azaltılması amacıyla tercih edilmiştir. Bu amaçla kaolin kiline ağırlıkça %0, %0.5, %1.0, %1.5 ve %2.0 oranlarında PPF lifleri ve PET talaşları ilave edilerek karışımlar oluşturulmuş ve Proctor deneyleri yardımıyla optimum su muhtevaları (wopt) ve maksimum kuru birim hacim ağırlıkları (γkmaks) belirlenmiştir. Proctor sıkılığında hazırlanmış numuneler üzerinde serbest basınç deneyleri yapılmıştır. Yapılan deneyler sonucunda katkılı kaolin kilinin mukavemetinde dikkate değer artışlar olduğu tespit edilmiştir. Optimum su muhtevasında ve Proctor sıkılığında hazırlanan numuneler üzerinde yapılan deney sonuçlarına göre %2.0 PPF eklenen kaolin kilinin serbest basınç mukavemeti, katkısız kaolin kili numunelere göre %116 oranında artış göstermiştir. Aynı oranda PET katkısı ile iyileştirilen kaolin kilinde ise serbest basınç mukavemeti %36 artış göstermiştir.

Keywords

Kil zemin, Polietilen tereftalat, Polipropilen elyaf, Zemin iyileştirme

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