ASTM Committee D35 on Geosynthetics has revised D5890, “Standard Test Method for Swell Index of Clay Mineral Component of Geosynthetic Clay Liners.” This test method covers an index method that enables the evaluation of swelling properties of a clay mineral in reagent water for estimation of its usefulness for permeability or hydraulic conductivity reduction in geosynthetic clay liners (GCL). It is adapted from United States Pharmacopeia (USP) test method for bentonite.

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