Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9822551 | Applied Clay Science | 2005 | 10 Pages |
Abstract
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.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Ivan Dananaj, Jana Frankovská, Ivan Janotka,