Relative performance of lime stabilized amended clay liners in different pore fluids |
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Authors: | H Lakshmikantha P V Sivapullaiah |
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Institution: | (1) AEO, KSPCB-GTZ, HAWA Project Office, 22nd Floor, PU Building, MG Road, Bangalore, 560 001, India;(2) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560 012, India |
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Abstract: | Successful design of soil liner and covers for landfills and waste impoundments involves selection of liner material and assessment
of chemical compatibility of the liner material. In this work locally available materials with different mineralogy have been
evaluated from the viewpoint of liner application. Many local soils may not meet the requirements of liner material; often
it is necessary to amend these soils with commercially available processed bentonite. Clay liners may be attacked by chemical
waste or leachate, concentrated organic chemicals can attack compacted clay effectively destroying the characteristics of
liner material. Thus the main aim of this work has been to assess the suitability of different types of locally available
materials for their potential use as liners for waste containment facilities. The materials studied are kaolinitic red earth,
illite and fly ash. Based on literature survey and experimental work in this laboratory, 20% by weight of bentonite has been
chosen for amending selected materials. Addition of 20% bentonite to selected liner material improved the hydraulic conductivity
and adsorption capacity of the amended mixture but, reduced the volume stability. To improve the volume stability of the amended
material and to have better resistance towards chemicals attack, stabilizing the amended mixture with 1% by weight of lime
has been considered. The relative advantages and disadvantages of four materials namely; red earth with 20% bentonite, illite
with 20% bentonite, fly ash with 20% bentonite and illite alone, stabilized with 1% by weight of lime were brought out. The
chemical compatibility of the materials to electrolyte solution (0.5 N NaCl), alkaline solution (0.5 N NaOH), acid (0.5 N
HCl) and organic fluid (CCl4) has been studied. The relative efficiency of the selected materials with selected pore fluids was compared. |
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Keywords: | amended clay liner fly ash land fills red earth stabilization volume change |
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