Decreasing Clay's Permeability Using Aluminum Salts

by Wayne V. Schmidt, Burns & McDonnell Engineering, Kansas City, MO, USA,
Brian A. Dempsey, Burns & McDonnell Engineering, Kansas City, MO, USA,
Richard W. Stephenso, Burns & McDonnell Engineering, Kansas City, MO, USA,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: The permeabilities of montmorillonite and kaolinite clays were reduced by precipitating aluminum hydroxide in the pores of the clay. The precipitate was formed by permeating the clays first with aluminum sulfate or polyaluminum-chloride followed by a dilute caustic solution. This caused the permeability to be decreased by at least a factor of 4 or 5. The integrity of the decreased permeability caused by the precipitate was only slightly affected when challenged by acidic and caustic solutions.

Subject Headings: Permeability (soil) | Clays | Consolidated soils | Material properties | Freight transportation | Aluminum (chemical) | Sulfates

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