Yasin ÇALIK, Rahim Kağan AKBULUT, Ahmet Şahin ZAİMOĞLU, Temel YETİMOĞLU

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

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

Anahtar Kelimeler:

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

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

Additives and reinforcing materials are frequently used in practice with the aim ofimproving some engineering properties of fine and coarse grained soils. However, separate polymer fibersand fine-grained soils have been mentioned in some limited number of studies. In this study, a series ofunconfined compression and freeze-thaw tests were conducted in laboratory in order to investigate theeffects of polypropylene fibers of different lengths (3 mm, 6 mm, and 12 mm) dispersed in high plasticityclay (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 as1, 3, 5, and 10. As a result of the experiments, it was determined that, the initial modulus of elasticity ofeach freeze-thaw cycle decreases as the polypropylene fiber length increases. Reinforced samples behavedmore 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,

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