Mechanical properties of kaolin-bentonite mixture soils treated with cement, lime and fly ash

Abstract

The present study examines the strength and deformation properties of clay soils stabilized with cement, fly ash and lime. For this reason, clay soil that consisted of kaolin and bentonite was constituted and this soil was admixed with cement and lime. Also, fly ash was used as a pozzolan with these additives. Different curing periods were applied and unconfined compressive testing was performed to investigate the effects of additives and curing times on the mechanical behavior of clay soils. Harvard miniature compactor was used to prepare the specimens. The treated specimens showed a brittle behavior compared to the untreated soil specimens and the deformations were much smaller. Deformations were also decreased due to the increment of curing times. Highest unconfined compressive strength was achieved in specimens with 6% lime-3% fly ash combination. The compressive strength of treated specimens were 6.6 times greater than the compressive strength of untreated specimens at the end of 180 days. Therefore, lime-fly ash additive was able to replace cement additive for stabilization of specimens from the point of mechanical and economical view.

Keywords

• Kaolin,bentonite,unconfined compressive strength

Çimento, kireç ve uçucu kül ile iyileştirilen kaolin bentonit karışımı zeminlerin mekanik özellikleri

Abstract

Bu çalışmada çimento, kireç ve uçucu kül ile yapılan iyileştirmenin kil zeminlerin mukavemet ve deformasyon özellikleri üzerindeki etkisi araştırılmıştır. Bu amaçla kaolin-bentonit karışımı bir zemine çimento, kireç ve bu bağlayıcılara puzolan olarak uçucu kül katılarak hazırlanan numuneler farklı kür sürelerinde bekletildikten sonra serbest basınç deneyi ile dayanımları tespit edilmiş, katkı maddelerinin ve kür sürelerinin mekanik davranışa olan etkisi araştırılmıştır. Numunelerin hazırlanmasında Harvard minyatür kompaktörü kullanılmıştır. Katkı içermeyen zemine göre katkı maddeleri ile iyileştirilmiş zeminlerin çok daha gevrek bir davranış sergilediği ve göçme anındaki deformasyonlarının küçüldüğü gözlenmiştir. Kür süresinin artması da deformasyon seviyesinin azalmasına sebep olmuştur. %6 kireç-%3 uçucu kül içeren numuneler en yüksek mukavemeti vermiştir. Katkısız örneklere göre dayanım 180 gün sonunda 6.6 kat artmıştır. Kireç-uçucu kül katkısının çimentonun yerini alabilecek yüksek mukavemet ve daha düşük maliyetle bir alternatif oluşturabileceği görülmüştür.

Keywords

• Kaolin,bentonit,serbest basınç mukavemeti

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