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2. ASTM D2487 (2006) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM Int 100:19428–12959
3. ASTM D4546 (2003) Standard test methods for one-dimensional swell or collapse of cohesive soils. ASTM International, West Conshohocken, PA, USA, Vol. 4.08, D-18 Committee on soils and rocks
4. ASTM D5298 (2003) Standard test method for measurement of soil potential (suction) using filter paper. ASTM International, West Conshohocken, PA, USA, Vol. 4.08, D-18 Committee on soils and rocks
5. ASTM D6836 (2002) Standard test methods for determination of the soil water characteristic curve for desorption using a hanging column, pressure extractor, chilled mirror hygrometer, and/or centrifuge)). ASTM International, West Conshohocken, PA, USA, Vol. 4.08, D-18 Committee on soils and rocks