Investigation of Unconfined Compressive Strength in a Freezing-Thawing Cycle of a CH Clay Soil Randomly Equipped with Polypropylene Fiber

Abstract

Additives and reinforcing materials are frequently used in practice with the aim of

improving some engineering properties of fine and coarse grained soils. However, separate polymer fibers

and fine-grained soils have been mentioned in some limited number of studies. In this study, a series of

unconfined compression and freeze-thaw tests were conducted in laboratory in order to investigate the

effects of polypropylene fibers of different lengths (3 mm, 6 mm, and 12 mm) dispersed in high plasticity

clay (CH) randomly on freeze-thaw behaviors. Fiber percentage for each length was chosen as 0.15%,

0.20%, and 0.25% of the total dry weight of the reinforced soil. Number of freeze-thaw cycles was taken as

1, 3, 5, and 10. As a result of the experiments, it was determined that, the initial modulus of elasticity of

each freeze-thaw cycle decreases as the polypropylene fiber length increases. Reinforced samples behaved

more ductile. As the number of cycles increased, freeze-thaw resistance in reinforced (0.15%-0.20%)

samples decreased in general for 1-3-5 cycles.

Keywords

• Freeze-thaw,unconfined compression strength,polypropylene fiber,fine-grained soil

Polipropilen Lif ile Rastgele Donatılandırılan Bir CH Kil Zemininin Donma-Çözülme Çevrimlerinde Serbest Basınç Dayanımının Araştırılması

Abstract

Katkı ve donatı malzemeleri, ince ve kaba daneli zeminlerin bazı mühendislik özelliklerini iyileştirmek amacı ile uygulamada sıkça kullanılmaktadır. Fakat sınırlı sayıdaki çalışmada ayrık polimer

lifler ile donatılı ince daneli zeminler konu edilmiştir. Bu çalışmada, yüksek plastisiteli bir kil (CH) zemin içerisine rastgele dağıtılmış farklı uzunluktaki (3 mm, 6 mm ve 12 mm) polipropilen liflerin donma çözülme davranışı üzerindeki etkilerini araştırmak için laboratuvarda bir seri serbest basınç ve donma çözülme deneyleri yapılmıştır. Polipropilen lif oranı, donatılı zeminin toplam kuru ağırlığının %0.15,

%0.20 ve %0.25’i olarak seçilmiştir. Bu oranlar her bir propilen lif uzunluğu için aynı seçilmiştir. Donma çözülme çevrim sayısı 1, 3, 5 ve 10 olarak alınmıştır. Yapılan deneyler sonucunda polipropilen lif uzunluğu arttıkça her bir donma-çözülme çevriminde başlangıç elastisite modülünün azaldığı belirlenmiştir. Donatılı numuneler, daha düktil bir davranış sergilemiştir. %0.15 ve %0.20 polipropilen lifle donatılandırılmış zemin numunelerinin 1, 3 ve 5 çevrim sayılarında donma-çözülme dayanımının azaldığı görülmüştür.

Keywords

• Donma-çözülme,Serbest basınç dayanımı,polipropilen lif,ince daneli zemin

Supporting Institution

Atatürk Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi

Thanks

Bu araştırma çalışmasına, Atatürk Üniversitesi Bilimsel Araştırma Projesi kapsamından destek sağlamıştır. Yazarlar bu destekten dolayı Atatürk Üniversitesi Rektörlüğü’ne teşekkürü bir borç bilirler.

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