UÇUCU KÜL, SİLİS DUMANI VE TÜF İLE STABİLİZE EDİLMİŞ BENTONİTTE MEYDANA GELEN MOLEKÜLER DEĞİŞİMLERİN FOURİER DÖNÜŞÜMLÜ KIZILÖTESİ SPEKTROSKOPİSİ (FT-IR) YÖNTEMİ İLE BELİRLENMESİ

Abstract

Kolay uygulanabilir ve ekonomik bir yöntem olması nedeniyle günümüzde çok fazla tercih edilen stabilizasyon, killi zemine eklenen katkı malzemesi ve zemin arasında oluşan puzolanik reaksiyonların bir sonucu olarak meydana gelmektedir. Oluşan puzolanik reaksiyonlar ise zeminde moleküler değişimlere neden olmaktadır. Bu değişimleri belirlemenin en yaygın yolu ise Fourier Dönüşümlü Kızılötesi Spektroskopisi (FT-IR) yöntemidir. Bu çalışmada, katkı malzemesi olarak uçucu kül ve silis dumanı ile asidik ve bazik tüfler kullanılarak hazırlanan ve 28 günlük kür uygulanan örneklerde FT-IR çalışmaları yapılmış ve stabilizasyon sonrası meydana gelen moleküler değişimler incelenmiştir. Analizler sonucunda bazik tüfün kullanıldığı örnekte, (Ca, Mg) CO3 gerilimiyle ilişkili olan 1431 cm-1’de yeni bir pik oluşmuştur. Uçucu külün kullanıldığı örnekte CaO oranı etkisiyle gelişen puzolanik reaksiyonlar sonucunda oluşan C-S-H ve C-A-S-H bileşikleri ile ilişkili 1416 cm-1 dalga sayısında oluşan yeni bir pik belirlenmiştir. Silis dumanı ve bazik tüfün birlikte kullanıldığı örnekte 1363 cm-1 ve 1431 cm-1 dalga sayılarında yeni pikler oluşmuştur ve bu pikler (Ca, Mg) CO3 gerilimiyle ilişkilidir. Asidik tüf ve uçucu külün kullanıldığı örnekte ise C-S-H ve C-A-S-H bileşikleri formunda kalsit oluşumu ile ilişkili 1363 cm-1 ve 1416 cm-1 dalga sayılarında iki yeni pik meydana gelmiştir. Çalışmanın sonuçlarına göre puzolanik reaksiyonların en iyi geliştiği örnekler %10 bazik tüf ve %10 silis dumanı ile %10 asidik tüf ve %10 uçucu kül katkılı örneklerdir.

Keywords

• Kil
• Stabilizasyon
• FT-IR

DETERMINATION OF MOLECULAR CHANGES OCCURING IN BENTONITE STABILIZED WITH FLY ASH, SILICA FUME AND TUFF BY FOUİRER TRANSFORM INFRARED SPECTROSCOPY (FT-IR) METHOD

Abstract

Stabilization, which is very preferred today because it is an easily applicable and economical method, occurs because of the pozzolanic reactions occurring between the additive materials added to the clayey soil and the soil. The pozzolanic reactions cause molecular changes in the soil. The most common way to detect these changes is the Fourier Transform Infrared Spectroscopy (FT-IR) method. In this study, FT-IR studies were carried out on the samples prepared using fly ash and silica fume, acidic and basic tuffs as additives and cured for 28 days, and molecular changes after stabilization were investigated. From the analysis, a new peak was formed at 1431 cm-1, which is related to the (Ca, Mg) CO3 stretch in the sample using basic tuff. In the sample using fly ash, a new peak was determined at 1416 cm-1 wave number associated with C-S-H and C-A-S-H compounds formed because of pozzolanic reactions with the effect of CaO ratio. In the example in which silica fume and basic tuff was used together, new peaks were formed at 1363 cm-1 and 1431 cm-1 wave numbers, and these peaks were associated with the (Ca, Mg) CO3 stretching. In the example in which acidic tuff and fly ash was used, two new peaks with wave numbers of 1363 cm-1 and 1416 cm-1 were formed, associated with calcite formation in the form of C-S-H and C-A-S-H compounds. According to the results of study, the examples in which pozzolanic reactions developed best are the 10% basic tuff + 10% silica fume added sample, and 10% acidic tuff + 10% fly ash added sample.

Keywords

• Clay
• Stabilization
• FT-IR

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