Effects of Polypropylene in Different Forms on the Static and Dynamic Properties of Cohesive Soils

Abstract

Soil improvement methods have an important place in civil engineering. There many soil improvement techniques available to be used. Polypropylene fiber is used in soil improvement commonly because, polypropylene fibers increase tensile strength and deformation capacity of soils and provides better dynamic properties. Polypropylene fibers are resistive to chemical and biological effects which results long lasting soil improvement. Cohesive soil is reinforced with polypropylene fibers (6 and 12 mm) and granular polypropylene. Polypropylene is added 0.2%, 0.4%, 0.6% and 0.8% and their effect on soil improvement. Samples were subjected to bender element test, so that change in small strain modulus can be determined. Unconfined compression tests were conducted to determine undrained shear strength of cohesive soil. Shear strength of cohesive soil increase with increase of polypropylene content. The highest increase is determined for 12 mm polypropylene length while the lowest increase is determined for 6 mm polypropylene length.

Keywords

• soil improvement
• polypropylene fiber
• bender element
• shear strength

Project Number

23LÖP233

Farklı Formlardaki Polipropilenin Kohezyonlu Zeminin Statik ve Dinamik Özellikleri Üzerine Etkileri

Abstract

Zemin iyileştirme yöntemleri inşaat mühendisliğinde önemli yere sahip olmakla birlikte çok çeşitli teknikleri bulunmaktadır. İyileştirme çalışmalarında, zeminlerin çekme mukavemetini ve deforme olma kapasitesini artırması, dinamik yükler altında daha iyi performans göstermesini sağlaması nedeniyle zemin içerisinde polipropilen kullanımı oldukça yaygındır. Aynı zamanda kimyasal ve biyolojik etkilere karşı dayanıklı olan polipropilen lifler, yapılan iyileştirmenin uzun ömürlü olmasını da sağlar. Bu çalışmada, kohezyonlu bir zemine iki farklı (6 ve 12 mm) uzunlukta lif ve granüler yapıda polipropilen farklı oranlarda (%0.2, %0.4, %0.6, %0.8) ilave edilerek zemindeki iyileşme gözlemlenmiştir. Hazırlanan karışım numuneleri üzerinde bender element deneyi yapılmış ve en yüksek kayma modülündeki değişim belirlenmiştir. Numunelerin drenajsız kayma mukavemeti için ise serbest basınç deneyleri gerçekleştirilmiştir. Sonuçta, zemin içerisindeki polipropilen içerinin artmasıyla numunelerin kayma dayanımının arttığı gözlemlenmiştir. Ayrıca, en yüksek katkı 12 mm polipropilen lifte gözlemlenirken, en az katkıyı ise granül polipropilen göstermiştir.

Keywords

• zemin iyileştirme
• polipropilen lif
• bender element
• kayma mukavemeti

Supporting Institution

Eskişehir Teknik Üniversitesi

Project Number

23LÖP233

Thanks

Bu çalışma Eskişehir Teknik Üniversitesi BAP birimi tarafından 23LÖP233 proje numarası ile desteklenmiştir. Yazarlar ayrıca bu çalışmada kullanılan granül polipropileni sağlayan Petkim’e, lif polipropileni sağlayan Macrolif’e teşekkür eder.

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