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2. ASTM D4647 (1993) Standard test method for identification and classification of dispersive clay soils by the pinhole test. ASTM International, West
Conshohocken, PA
3. ASTM D4221 (1999) Standard test method for dispersive characteristics of clay soil by double hydrometer. ASTM International, West
Conshohocken, PA
4. ASTM D6572 (2000) Standard test methods for determining dispersive characteristics of clayey soils by the crumb test. ASTM International, West
Conshohocken, PA
5. ASTM D2487 (2011) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM International, West
Conshohocken, PA