Effect of Recycled Carbon Black on Consistency Limits of Clayey Soils

Abstract

Nowadays, the recycling of waste materials is one of the important tasks in the world. Not only

does it solve the environmental problems but also the economic return provides. The recycled carbon black (CBr)

is obtained by recycling of scrap tires using pyrolysis method. In this study, the effect of CBr on consistency limits

of clayey soils was investigated. Two different types of clayey soils were used; the first one was high plastic clay

(CH) and the other one was low plastic clay (CL). The CBr was mixed with both clays in 0%, 1%, 3%, 5% and

10% percentages at dry state. The liquid and plastic limit tests were performed on the mixtures and also on pure

(0%) clayey soils. It is observed that the liquid limit value of CH clay decreases sharply between 0% and 1% CBr

contents and then this decreasing trend goes on smoothly. On the other hand, the plastic limit value of CH clay

increases with increasing CBr contents, achieves a maximum value at 1% CBr content and then starts to decrease

beyond this CBr content. There is no considerable decrease discovered on liquid limit values of CL clay. With

a similar manner, the plastic limit value of CL clay decreases with an increase in CBr contents, however, this

decreasing trend is not remarkable.

Keywords

• Recycling,carbon black,consistency limits,clayey soils

Geri Dönüştürülmüş Karbon Karasının Killi Zeminlerin Kıvam Limitlerine Etkisi

Abstract

Günümüzde, atık malzemelerin geri dönüştürülmesi dünya çapında önem arz etmektedir. Geri dönüşümle

çevresel problemlerin önüne geçilmesinin yanı sıra ekonomik katkılar da sağlanmaktadır. Geri dönüştürülmüş

karbon karası (KKg), hurda lastiklerin pirolizi sonucunda elde edilen bir geri dönüşüm malzemedir. Bu çalışmada,

KKg’nin killi zeminlerin kıvam limitlerine olan etkisi incelenmiştir. Bu amaçla iki farklı kil kullanılmıştır; yüksek

plastisiteli kil (CH) ve düşük plastisiteli kil (CL). Killerin içine kuru ağırlıkça %0, %1, %3, %5 ve %10 oranında

KKg katılarak karışımlar hazırlanarak likit limit ve plastik limit deneyleri yapılmıştır. Deney sonuçlarından CH

kilin likit limit değerinin%1 KKg içeriğinde, %0 KKg içeriğine göre ani olarak düştüğü ve KKg arttıkça azalma

eğilim hızının düşerek devam ettiği belirlenmiştir. Diğer taraftan, CH kilin plastik limit değerinin ise %1 KKg

içeriğine kadar arttığı ve bu noktadan sonra KKg arttıkça azaldığı tespit edilmiştir. CL kilin likit limitinde ise gözle

görülür bir düşüşün olmadığı ve benzer şekilde CL kilin plastik limit değerlerinde de önemli bir düşüşün olmadığı

belirlenmiştir.

Keywords

• Geri dönüşüm,karbon karası,kıvam limitleri,killi zeminler

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