Kaolinitin kıvam limitleri üzerine inorganik tuz çözeltilerinin etkileri

Abstract

Bu çalışma, farklı konsantrasyonlardaki inorganik tuzların (KCl, BaCl₂, MgCl₂, KNO₃, Na₂SO₄ ve MgSO₄) bariyer sistemlerde geçirimsizlik alt tabaka dolgu malzemesi olarak kullanılan kaolinitin geoteknik özellikleri (Atterberg Limitleri) üzerine etkileri ortaya koymaktadır. Distile su veya çeşme suyu kullanımı, depo sahası koşullarını temsil edici olmadığından, dolgu malzemeleri üzerine sızıntı suyu etkilerini araştırmak için tuz çözeltileri kullanılmıştır. Ayrıca, kaolinit malzemesinin minerolojik karakterizasyonu incelenmiştir. Killi zemin numunelerinin, Birleşik Zemin Sınıflandırma Sistemi’ne göre Atterberg Limtleri; likit limit (LL) ve plastik limit (PL) değerleri belirlenmiş ve minerolojik çalışmalar için XRD, BET ve FT-IR analizleri gerçekleştirilmiştir. Elde edilen sonuçlar, tüm tuz çözeltilerinin kaolinin kıvam limitleri üzerinde önemli bir etkisi olduğunu göstermiştir. Kimyasal konsantrasyon artışı, kaolinitin likit limit değerlerini düşürürken plastik limit değerlerini arttırmıştır. 2 ve 3 değerlikli katyonların kaolin üzerine etkileri, tek değerlikli katyonlara göre açıkça görülmüştür. Sonuç olarak, kaolinit malzemesi hidrolik iletkenliği artar ve şişme eğilimi azalırken, DDL tabakası incelme ve kaolinit partikülleri floküle olma eğiliminde iken, kimyasal çözeltiler yüksek plastisiteye sahip kaolinit malzemesinin likit limit değerlerlerini düşürmektedir.

Keywords

• İnorganik tuzlar,kıvam limitleri,kaolinit,düzenli depolama,bariyer sistemler

Effect of inorganic salt solutions on consistency limits of kaolinite

Abstract

This study presents the effect of different inorganic salt solutions (KCl, BaCl₂, MgCl₂, KNO₃, Na₂SO₄ and MgSO₄) at different concentrations on geotechnical properties (Atterberg Limits) of kaolinite material which can be used as impermeable bottom liner in barrier systems. Since the use of distilled water or tap water is far from being representative of the in-situ conditions in landfills, salt solutions were used to investigate the leachate effect on liner materials. Additionally, the mineralogical characterization of kaolinite was studied.  Atterberg limits, specifically the liquid limit (LL) and plastic limit (PL) that were used for classifying the clayey soil samples according to the Unified Soil Classification System were determined whereas mineralogical studies performed included XRD, BET and FT-IR analyses. Results indicated that all salt solutions have a considerable effect on the consistency limits of kaolinite. The liquid limit values of kaolinite decreased with increasing chemical concentration whereas plastic limit values increased. It is observed that the effects of the divalent and trivalent cations on kaolinite were more apparent than those of monovalent cations. As a result chemical solutions decrease liquid limit values of high plasticity kaolinite materials,  tend to reduce the thickness of the DDL and flocculate the kaolinite particles, resulting in reduction of swelling and increasing of hydraulic conductivity.

Keywords

• Inorganic salts,consistency limits,kaolinite,landfilling,barrier systems

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