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2. ASTM D2487 (2011) Standard practice for classification of soils for engineering purposes (unified soil classification system). ASTM International, West Conshohocken, PA, USA
3. ASTM D4253 (2016) Standard test methods for maximum index density and unit weight of soils and calculation of relative density. ASTM International, West Conshohocken, PA, USA
4. ASTM D4254 (2016) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM International, West Conshohocken, PA, USA
5. ASTM D6913 (2009) Standard test method for particle-size distribution (Gradation) of soils using sieve analysis. ASTM International, West Conshohocken, PA, USA