کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9822551 | 1519146 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The influence of smectite content on microstructure and geotechnical properties of calcium and sodium bentonites
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
The differences in bentonite quality and quantity of smectite critically influence permeability, which is confirmed by the decrease in permeability in the direction Ca (68%)âCa (92%)âNa (68%)âNa (92%). Ca-bentonite with 92% smectite content showed similar permeability as the 68% Na-bentonite, but it retained lower water sorption characteristics. Na-bentonite is used as a sealing component in geosynthetic clay liners (GCL) and may undergo an ion exchange by calcium ions, converting it to Ca-bentonite because the calcium content of most soils is sufficient to induce such a process. All significant Na-bentonite properties are being changed when converted back to Ca form. Our study has made an attempt to uncover differences in various bentonite-type behaviors and suggests one way to improve sealing properties of Ca-bentonite with lower smectite content upgrading it by flotation to smectite-rich Ca equivalent instead of natrification.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 28, Issues 1â4, January 2005, Pages 223-232
Journal: Applied Clay Science - Volume 28, Issues 1â4, January 2005, Pages 223-232
نویسندگان
Ivan Dananaj, Jana Frankovská, Ivan Janotka,