1. ASTM. 2009. Standard test methods for particle-size distribution (gradation) of soils using sieve analysis. ASTM D6913-04. West Conshohocken PA: ASTM.
2. ASTM. 2011. Standard test method for direct shear test of soils under consolidated drained conditions. ASTM D3080/D3080M-11. West Conshohocken PA: ASTM.
3. ASTM. 2014. Standard test methods for specific gravity of soil solids by water pycnometer. ASTM D854-14. West Conshohocken PA: ASTM.
4. ASTM. 2016a. Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM D4253-16. West Conshohocken PA: ASTM.
5. ASTM. 2016b. Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM D4254-16. West Conshohocken PA: ASTM.