Effect of Fly Ash Replacement on Compressibility of Deep Mixing Columns

Year 2024, Volume: 6 Issue: 1, 139 - 152, 30.04.2024

Yavuz Yenginar , Murat Olgun

https://doi.org/10.47112/neufmbd.2024.38

Abstract

The unique aspect of this study is to determine the optimum injection parameters that will minimize the compression capacity of fly ash-containing deep mixing columns (DMC). In the study, a clayey soil was improved by wet mixing method. The effects of variables such as soil liquidity index, water/binder ratio, cement, superplasticizer and fly ash amounts on the compression properties of DMC were examined. The design of the experiments was made according to the Taguchi method. DMC samples were prepared according to the L16 orthogonal index table for 5 parameters and 4 levels. Consolidation experiments were performed on the samples kept in cure (28 and 56 days) and the change in the compression index, swelling index and void ratio of the sample was determined. At the end of the analyses, optimum values of the parameters (liquidity index of the soil = 0.4, water/binder ratio = 0.8, binder dosage = 425 kg/m3, superplasticizer ratio = 3%, fly ash ratio = 40%) were obtained. The results obtained show that by using 40% fly ash in DMC production, injection costs will also decrease at this rate. In addition, environmental damage will be minimized by increasing the use of fly ash, which is a waste product.

Keywords

Clayey soil, Compressibility, Deep mixing method, Fly ash, Super plasticizer, Taguchi method

Project Number

Bu çalışma TÜBİTAK tarafından 217M946 numaralı proje ile desteklenmektedir. Bu çalışma doktora tezinden üretilmiştir.

Uçucu Kül Katkısının Derin Karıştırma Kolonlarının Sıkışabilirliğine Etkisi

Abstract

Sunulan bu çalışmanın özgün tarafı uçucu kül katkılı derin karıştırma kolonlarının (DKK) sıkışma kapasitesini en aza indirecek optimum enjeksiyon parametrelerini belirlemektir. Çalışmada killi bir zemin ıslak karıştırma yöntemiyle iyileştirilmiştir. Zeminin likitlik indisi, su/bağlayıcı oranı, çimento oranı, süper akışkanlaştırıcı miktarı ve uçucu kül ikame oranı gibi değişkenlerin DKK’nın sıkışabilirlik özelliğine etkisi incelenmiştir. Deneylerin tasarımı Taguchi yöntemine göre yapılmıştır. 5 parametre ve 4 seviye için L16 ortogonal dizin tablosuna göre DKK numuneleri hazırlanmıştır. Kürde bekletilen (28 ve 56 gün) numunelerin konsolidasyon deneyleri yapılarak numunenin sıkışma indisi, kabarma indisi ve boşluk oranındaki değişim belirlenmiştir. Analizler sonunda parametrelerin optimum değerleri (zeminin likitlik indisi=0.4, su/bağlayıcı oranı=0.8, bağlayıcı dozajı=425 kg/m3, süper akışkanlaştırıcı oranı=%3, uçucu kül oranı=%40) elde edilmiştir. Elde edilen sonuçlar DKK imalatında %40 oranında uçucu kül kullanılması ile enjeksiyon maliyetlerinin de bu oranda azalacağını göstermektedir. Ayrıca atık bir ürün olan uçucu kül kullanımının artması ile çevresel zararlar en aza inecektir.

Keywords

Derin karıştırma yöntemi, Killi zemin, Sıkışabilirlik, Süper akışkanlaştırıcı, Taguchi yöntemi, Uçucu kül

Supporting Institution

TÜBİTAK

Project Number

Bu çalışma TÜBİTAK tarafından 217M946 numaralı proje ile desteklenmektedir. Bu çalışma doktora tezinden üretilmiştir.

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