Durability of Sand Bentonite Liners in Surface Cappings of Waste Deposite Sites

摘要

At a test site for top liners, laid out in 1982 at a waste deposit site of VAM atWijster, the quality has been evaluated of a sand bentonite liner. The thickness of the liner and the thickness of the material have been determined at three slope locations. The content of Wyoming bentonite has been determined according to the sedimentation method. At various points in time over a period of approximately 3 months, the hydraulic permeability has been measured on the basis of undisturbed samples with a diameter of 0.30 m and a height of 0.09 m, using the method of falling head. In addition, at three slope locations, the loss of percolation has been measured by an infiltrometer ring sealed at the top.