Improving the Strength Properties of Kaolinite Type Clays Using Melamine Formaldehyde Liquid Polymer

Abstract

Soil remediation methods have become one of the preferred methods due to the need for more space for construction activities in cities and industrial areas. Another reason for choosing the remediation techniques is to obtain economical and faster solutions compared to the conventional methods. In recent years, the use of chemical stabilizers in soil remediation applications, such as slope stability, erosion and bearing capacity, has increased steadily due to economy, easy application, workability and early strength gain. In this study, the effects of liquid melamine formaldehyde polymer on the strength properties of kaolinite type clay were investigated. The changes in compressive strength values were evaluated by adding liquid melamine formaldehyde polymer into the kaolinite specimens compacted at previously determined optimum water content value. The liquid polymer was added at 3, 6, 9 and 12 per cent by weight with water, so as not to exceed the optimum water content of the matrix, and the prepared polymer-added samples were cured for 3, 7, 14 and 28 days to observe the strength gain at different curing times. Significant increases were observed in the strength values of the samples stabilized with different percentages of liquid polymer subjected to unconfined compression tests at the end of the curing period as the polymer addition ratio and the curing time increased. According to the obtained results, melamine formaldehyde liquid polymer can be applied to clayey soils as a soil stabilizer.

Keywords

• Kaolinite,Unconfined Compressive Strength,Soil Stabilization,Melamine Formaldehyde Polymer,Erosion,Landslides

Kaolen Türü Killi Zeminlerin Dayanım Özelliklerinin Melamin Formaldehit Sıvı Polimeri Kullanarak İyileştirilmesi

Abstract

Zemin iyileştirme yöntemleri, şehirler ve endüstri bölgelerinde artan yapılaşma ihtiyacı sonucunda daha çok alan kullanımı gereksinimi nedeniyle gün geçtikçe uygulamalarda tercih edilen yöntemlerden biri haline gelmiştir. Bir diğer tercih sebebi ise yeni geliştirilen yöntem ve malzemeler ile geleneksel yöntemlere göre daha ekonomik ve hızlı çözümlerin elde edilebilmesidir. Dünyada son yıllarda kimyasal stabilizörlerin, taşıma kapasitesi, şev duraylılığı ve erozyon gibi problemli durumlarda, zemin iyileştirme uygulamalarında kullanımı, ekonomik oluşu, kolay uygulanması ve erken dayanım kazanma nedenleri ile giderek artış göstermektedir. Bu çalışmada sıvı haldeki melamin formaldehit polimerinin, kaolen türü killerin dayanım özellikleri üzerindeki etkisi incelenmiştir. Sıvı melamin formaldehit polimerinin optimum su muhtevasında sıkıştırılmış kaolen örnekler içerisine eklenerek serbest basınç dayanımlarındaki değişimler araştırılmıştır. Sıvı polimer yüzde 3, 6, 9 ve 12 oranlarında örneklere optimum su muhtevasını geçmeyecek şekilde, su ile yer değiştirerek eklenmiş ve hazırlanan polimer katkılı örnekler 3, 7, 14 ve 28 gün boyunca küre tabii tutulmuşlardır. Kür süresi sonunda serbest basınç testlerine tabii tutulan farklı yüzdeler ile stabilize edilmiş örneklerde, polimer katkı oranı ve kür süresi arttıkça dayanımlarda ciddi artışlar tespit edilmiştir. Elde edilen bu sonuca göre melamin formaldehit sıvı polimer katkısı zemin iyileştirme yöntemi olarak killi zeminlere uygulanabilecektir.

Keywords

• Serbest Basınç Dayanımı,Zemin İyileştirme,Melamin Formaldehit Polimeri,Erozyon,Kaolin,Heyelan

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