1. ASTM (2006) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM D854-14. ASTM International, West Conshohocken
2. ASTM (2011) Standard test method for direct shear test of soils under consolidated drained conditions. ASTM D3080M-11. ASTM International, West Conshohocken
3. ASTM (2016a) Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM D4253-16. ASTM International, West Conshohocken
4. ASTM (2016b) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM D4254-16. ASTM International, West Conshohocken
5. ASTM (2017) Standard test methods for particle-size distribution (gradation) of soils using sieve analysis. ASTM D-6913. ASTM International, West Conshohocken