The effect of lime, gypsum and fly ash on the strength and plasticity of clayey soils

Abstract

Some clayey soils tend to show weakness in strength and they necessitate additional improvements before design studies. For the purpose of achieving the desired strength, the soil can be stabilized chemically with some additives by using the shallow mixing technique. The aim of this paper is investigation and comparison of different additives’ shallow mixing performances on improving the strength and plasticity of clayey soils. As additive materials lime, gypsum and fly ash were used. The study was performed in the laboratory by preparing cylindrical samples of the additive and soil mixtures. After a four month curing period, unconfined compression test and Atterberg limit tests were performed on the specimens extracted from the cylindrical samples. The results showed that the best performance was achieved with fly ash with an increase of 172.59% on the soil’s unconfined compressive strength. Lime provided a medium degree of improvement in comparison with fly ash with an increase of 65.38% on the soil’s strength. Gypsum, however, reduced the soil’s strength by 4.33%. Lastly, all additive materials showed a decrement in the soil plasticity.

Keywords

• Lime
• fly ash
• gypsum
• unconfined compressive strength
• plasticity

Kireç, Jips ve Uçucu Külün Killerin Dayanımı ve Plastisitesi Üzerindeki Etkisi

Abstract

Bazı killi zeminler dayanım açısından zayıflık gösterme eğilimindedir ve tasarım çalışmaları öncesinde ek iyileştirmeler gerektirir. İstenilen dayanıma ulaşmak için zemin yüzeysel karıştırma tekniği kullanılarak katkı maddeleri ile kimyasal olarak iyileştirilebilir. Bu çalışmanın amacı farklı katkı maddelerinin killi zeminlerin dayanımını arttırmadaki yüzeysel karıştırma performanslarının bulunması ve karşılaştırılmasıdır. Katkı maddesi olarak kireç, jips ve uçucu kül kullanılmıştır. Çalışma laboratuvarda katkı maddesi ve zemin karışımlarının silindirik örnekleri hazırlanarak gerçekleştirilmiştir. Dört aylık bir kür süresi sonunda silindirik örneklerden alınan zemin numuneleri üzerinde tek eksenli basınç dayanımı deneyi ve Atterberg limit testleri uygulanmıştır. Elde edilen sonuçlar incelendiğinde en iyi performansın %172.59 bir iyileştirmeyle uçucu kül ile sağlandığı görülmüştür. Kireç zeminin dayanımını %65.38 arttırarak orta derecede bir iyileştirme sağlamıştır. Diğer taraftan jips zeminin dayanımını %4.33 oranında azaltmıştır. Son olarak ise bütün katkı malzemeleri zemin plastisitesinde bir azalma sağlamıştır.

Keywords

• Kireç
• uçucu kül
• jips
• serbest basınç dayanımı
• plastisite

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