Effect of Inorganic Salt Solutions on Physical and Mechanical Properties of Bentonite Based Liner
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24, Issue 4
Abstract
The influence of inorganic salt solutions on the physical and mechanical properties of bentonite based liner materials is highlighted. Compacted pond ash-bentonite (PAB) and sand-bentonite (SB) liners, prepared at their respective maximum dry unit weight (MDD) and optimum moisture content (OMC) are permeated with NaCl, CaCl2, and FeCl3 solutions of concentrations from 0.1 to 1 M. The physical and mechanical properties are determined after permeations of 7, 14, and 21 days. The consistency limits, free swell indices, and volumetric shrinkage strain are found to reduce and the hydraulic conductivity increased as the concentration of salt solutions and their permeation time increased. Permeation of lower concentration salt solutions increases the unconfined compressive strength (UCS) value and this reduces substantially as the concentration increases. Salt solutions of polyvalent cations have more impact than those of monovalent cations. PAB specimens are less vulnerable to these changes compared with those of SB specimens. The concentration of permeating cations increases substantially in the liner materials with an increase in salt concentration and permeation time, and the concentration of inherently adsorbed elements decreases.
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Acknowledgments
This work was carried out at the Civil Engineering Department of National Institute of Technology Rourkela, an institution funded by the Ministry of Human Resources Department, Government of India. The authors acknowledge the support provided by the institute for this work. However, this research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24 • Issue 4 • October 2020
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© 2020 American Society of Civil Engineers.
History
Received: Nov 15, 2019
Accepted: May 22, 2020
Published online: Jul 30, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 30, 2020
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