Kaolinitin kıvam limitleri üzerine inorganik tuz çözeltilerinin etkileri

Yıl 2018, Cilt: 20 Sayı: 1, 110 - 120, 09.04.2018

Gamze Varank , Ahmet Demir , Senem Yazıcı Güvenç , Mehmet Şükrü Özçoban

https://doi.org/10.25092/baunfbed.413717

Cited By: 1

Öz

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.

Anahtar Kelimeler

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

Effect of inorganic salt solutions on consistency limits of kaolinite

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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