SHEAR STRENGTH PARAMETERS AND DEFORMABILITY PROPERTIES OF SILICATE-BASED RESIN ADDED SAND-TYPE SOIL SPECIMENS

Öz

In this study, the shear strength, uniaxial compressive strength (UCS) values and deformability properties of silicate-based polymer resin added silty sand type soil specimens were examined through a series of experimental studies. Although the UCS and shear strength values increased, minor decreases in the internal friction angle values were measured as the resin ratio increased. It was determined that the main reason for the improvement in strength values due to the increase in resin content is the increase in cohesion values. It was found that the UCS values calculated according to the cohesion and internal friction angle parameters of the Mohr & Coulomb failure criterion (UCSc) were 2.6-3.0 times lower than the values obtained from the direct UCS experiment. According to this finding, it was concluded that the Mohr & Coulomb failure criterion is not properly usable to represent the mechanical behaviors of resin added sands. As another outcome, the ratio between UCS/UCSc slightly decreased with an increase in the resin amount. In other words, it has been determined that the Mohr&Coulomb failure criterion gives a bit more inaccurate results for the specimens with low binder contents. With the increase in the resin content ratio, significant increases were obtained in both elastic modulus and ductility properties of the samples. It has been evaluated that the silicate-based polymer resin binder is advantageous to provide significant increases in the toughness and energy absorption capacity of soils.

Anahtar Kelimeler

• Resin stabilized sands
• Soil improvement
• Silicate based resins
• Shear box test
• Compressive strengths of binder added sands

SİLİKAT ESASLI REÇİNE KATKILI KUM TİPİ ZEMİN ÖRNEKLERİNİN KESME MUKAVEMETİ PARAMETRELERİ VE DEFORMABİLİTE ÖZELLİKLERİ

Öz

Bu çalışmada farklı oranlarda silikat bazlı polimer reçine eklenmiş siltli kum türü bir zeminin makaslama dayanımı, tek eksenli sıkışma dayanımı (UCS) değerleri ve deformabilite özellikleri bir dizi deneysel çalışma ile incelenmiştir. Reçine oranı arttıkça UCS ve makaslama dayanımı degerleri artmasına rağmen içsel sürtünme açısının azaldığı belirlenmiştir. Reçine içeriği artışına bağlı dayanım değerini iyileştiren ana etkenin kohezyon artışı olduğu tespit edilmiştir. Kohezyon ve içsel sürtünme açısı değerleri ile Mohr&Coulomb yenilme ölçütüne gore hesaplanan UCS (UCSc) değerlerinin direk UCS deneyinden elde edilen değerlerden 2.6-3.0 kat düşük olduğu belirlenmiştir. Bu bulguya göre, Mohr&Coulomb yenilme ölçütünün reçineli kumları iyi temsil edemediği sonucuna varılmıştır. UCS/UCSc arasındaki arasındaki oranın reçine oranı artışı ile biraz azaldığı bulunmuştur. Bir diğer ifade ile bağlayıcı içeriği düşük olan numunelerde Mohr&Coulomb yenilme ölçütünün daha hatalı sonuçlar verdiği belirlenmiştir. Reçine oranının artışı ile numunelerin hem elastisite modülü hem de süneklik özelliklerinde anlamlı artışlar görülmüştür. Silikat bazlı polimer reçine bağlayıcının önemli bir avantajı olarak zeminlerin tokluk ve enerji emme kapasitesi özelliklerinde önemli artışlar sağlayabildiği değerlendirilmiştir.

Anahtar Kelimeler

• Reçine katkılı kumlar
• Zemin iyileştirme
• Silikat esaslı reçine
• Zemin makaslama kutusu deneyi
• Bağlayıcılı zeminlerin sıkışma dayanımları

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