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- W4253313429 abstract "The applicability of bentonite as a lining material for isolation of waste disposal sites was investigated on laboratory and field scale. The permeability of sand-bentonite mixtures depends on the type of bentonite, the bentonite content in the mixture and the dry bulk density. In laboratory experiments the saturated conductivity decreased at low hydraulic head gradients, indicating that water flow in these mixtures does not obey Darcy's law. The swelling of the bentonite, which is responsible for the low permeability, is a time-dependent process. The permeability decreased with time and even after two months the permeability had not reached a constant level. In sand-bentonite mixtures with 5% (w/w) bentonite, the saturated conductivity ultimately reached a level below 1 x 10-10 m s -1 , which is sufficiently low for surface capping of waste disposal sites. The sand-bentonite mixtures were 10-100 times more permeable for landfill leachate than for clean water. Bottom liners should, therefore, contain considerably more bentonite to prevent infiltration of leachate in the subsoil. Water-balance studies on experimental fields showed that there was no leakage at all through bentonite liners used for surface capping of a waste disposal site over a two-year period." @default.
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- W4253313429 date "1987-01-01" @default.
- W4253313429 modified "2023-09-27" @default.
- W4253313429 title "Bentonite Liners for Isolation of Waste Disposal Sites" @default.
- W4253313429 cites W2028914426 @default.
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- W4253313429 doi "https://doi.org/10.1177/0734242x8700500113" @default.
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