Use of Powdered Steel Slag in Cement-Bentonite Slurry Wall Construction

Abstract

This paper presents a comprehensive laboratory investigation into the workability, permeability and unconfined compressive strength of powdered-steel-slag, lime-amended cement-bentonite backfills using several series of mixtures. Prepared mixtures comprise various proportions of cement, bentonite, powdered steel slag, and lime, which have been tested for particle size distribution (PSD), liquid limit, plastic limit, permeability, and unconfined compressive strength (UCS). For each mixture, the effect of varying curing time was investigated. The results show that the permeability of the powdered steel-slag, lime-amended cement-bentonite backfill is near enough to the 10^-9 m/s (10^-7 cm/s) required by standards. The laboratory observations clearly show that cement-bentonite-steel slag (CBS) backfill-evaluated in this study strengthens with time. When placed, the backfill is viscous liquid; later, it is a material strong enough to stand vertically. Amended mixtures including 9% of bentonite content have identified that they do not only give higher strength values but also present lower permeability considers to other mixtures as two most important keys in slurry wall construction. Therefore, it is concluded that CB–powdered steel slag–lime blended mixtures are superior materials for constructing slurry walls.

Keywords

• Cement-Bentonite,Permeability,Powdered Steel Slag,Secont Mudulus,Slurry Wall,unconfined Compressive Strength

Toz Çelik Cürufunun Çimento-Bentonit Bulamaç Hendeği Duvar Yapımında Kullanımı

Abstract

Bu makalede, çimento-bentonit-toz çelik cürufu-kireç karışımlarının, bulamaç hendeği duvarlarda dolgu maddesi olarak kullanılabilmesi için, işlenebilirlik, geçirgenlik ve serbest basınç dayanımı özelliklerinin araştırıldığı kapsamlı bir laboratuvar çalışması sunulmaktadır. Çeşitli oranlarda hazırlanan çimento-bentonit-toz çelik cürufu-kireç karışımlarının, tane büyüklüğü dağılımı (PSD), likit limit, plastik limit, geçirgenlik ve serbest basınç dayanımınlarına (UCS) bakılmıştır. Her karışım için, kür süresinin etkisi incelenmiştir. Sonuçlar, çimento-bentonit-toz çelik cürufu-kireç dolgu maddesinin geçirgenliğinin standartların gerektirdiği 10-9 m/s (10-7 cm/s) yakın olduğunu göstermektedir. Laboratuvar gözlemleri, bu çalışmada değerlendirilen çimento-bentonit-toz çelik cürufu-kireç (CBS) dolgu maddesinin mukavemetinin zamanla arttığını göstermektedir. Dolgu maddesi hendeğe yerleştirildiginde viskoz bir sıvı kıvamındadır; daha sonra, düşey olarak durabilecek kadar güçlü bir malzemeye dönüşmektedir. %9 bentonit içeren karışımlar, sadece daha yüksek mukavemet değerleri vermekle kalmayıp, aynı zamanda bulamaç duvarı için önemli olan, bu çalışmada test edilen diğer karışımlara göre daha düşük geçirgenlik değeri vermişlerdir. Çimento-%9 bentonit-toz çelik cürufu- kireç karışımlarının bulamaç duvarı oluşturmak için uygun karışımlar olduğu sonucuna varılmıştır.

Keywords

• Çimento-Bentonit,Geçirgenlik,Toz Çelik Cürufu,Sekant Modülü,Bulamaç Duvar,Serbest Basınç Mukavemeti

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