Chemical Effects on Clay Hydraulic Conductivityby James K. Mitchell, Univ of California, Berkeley, CA, USA,
Fritz T. Madsen, Univ of California, Berkeley, CA, USA,
Abstract: Hydraulic conductivity and its susceptibility to changes with time or exposure to chemicals are major factors in selection of clay for use in waste containment barriers. Available concepts of clay-chemical interactions and data permit development of conclusions useful for prediction of clay barrier performance in waste containment applications. The type of test used may have a very large effect on the values of hydraulic conductivity that are measured. In almost all cases pure organic liquids will interact adversely with clays by causing some shrinking and cracking, with concurrent large conductivity increases; however, dilute solutions of organics have essentially no effect.
Subject Headings: Clays | Soil pollution | Soil classification | Permeability (soil) | Hydraulic conductivity | Waste containment | Chemical wastes | Waste disposal
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