1. ASTM. 2007. Standard test method for particle-size analysis of soils. ASTM D422-63. West Conshohocken, PA: ASTM.
2. ASTM. 2010a. Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM D4318-10e1. West Conshohocken, PA: ASTM.
3. ASTM. 2010b. Standard test method for measurement of soil potential (suction) using filter paper. ASTM D5298-10. West Conshohocken, PA: ASTM.
4. ASTM. 2012. Direct shear test of soils under consolidated drained conditions. ASTM D3080/D3080M-11. West Conshohocken, PA: ASTM.
5. ASTM. 2014. Standard test methods for specific gravity of soil solids by water pycnometer. ASTM D854-14. West Conshohocken, PA: ASTM.