The behavior of Bacillus sp. improved soils under freeze-thaw effect

Abstract

In recent years, the need for land has been increasing due to the increasing population, especially in big cities. In addition to the use of lands that meet sufficient criteria in terms of foundation soils, it has become compulsory to use lands that do not meet these criteria. In lands that do not meet sufficient criteria in terms of basic soils, improvement is made by using classical additives such as lime, fly ash, blast furnace slag. However, these additives are not environmentally friendly as they increase CO2 emissions in nature. Therefore, in recent years, there has been an interest in new environmentally friendly additives alternative to these additives. One of these additives is Bacillus Sp. which provides improvement in the soils by producing CaCO3 in the soil where it is injected. In this study, strength and swelling pressures were investigated under freeze-thaw cycles on high plasticity clay (CH) and sandy clay (SC) soils injected with Bacillus Sp. According to the results, it was determined that Bacillus Sp. contributed positively to the improvement of the strength and swelling pressure parameters of soils.

Keywords

• Soil improvement
• Bacillus sp.
• Strength
• Swelling pressure

Bacillus sp. ile iyileştirilmiş zeminlerin donma çözülme etkisindeki davranışı

Öz

Son yıllarda, özellikle büyük kentlerde artan nüfusa bağlı olarak arazi kullanımı git gide artmaktadır. Bu durumda, temel zemini bakımından yeterli kriterli sağlayan arazilerin kullanımının yanı sıra bu kriterleri sağlamayan arazilerin kullanımını da zorunlu hale getirmiştir. Temel zemini bakımından yeterli kriterleri sağlamayan arazilerde, kireç, uçucu kül, yüksek fırın cürufu gibi katkılarla zemin iyileştirme yapılarak istenilen kriterlere ulaşılmaktadır. Ancak bu katkılar doğada CO2 salınımını artırdığı için çevre dostu değillerdir. Bu nedenle, bu katkıların yerini yeni nesil çevre dostu zemin iyileştirme katkıları almaktadır. Bu katkılardan bir tanesi enjekte edildiği zemin içerisinde CaCO3 üreterek iyileşme sağlayan Bacillus Sp.’dir. Bu bağlamda çalışma kapsamında, yüksek plastisiteli kil (CH) ve kumlu kil (SC) türü iki farklı zemin türünde yeni nesil iyileştirme katkısı olan Bacillus Sp. kullanılarak, donma çözülme döngüleri altında mukavemet ve şişme basıncı davranışları araştırılmıştır. Sonuçlara göre, Bacillus Sp.’nin CH ve SC türü zeminlerde, mukavemet ve şişme basıncı parametrelerinin iyileştirilmesinde olumlu yönde katkısı olduğu belirlenmiştir.

Anahtar Kelimeler

• Zemin İyileştirme
• Bacillus Sp.
• Şişme Basıncı
• Serbest Basınç Mukavemeti

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