1. ASTM C127-15 (2015) Standard test method for relative density (specific gravity) and absorption of coarse aggregate, ASTM International, West Conshohocken
2. ASTM D1140-00 (2006) Standard test methods for amount of material in soils finer than the no. 200 (75-um) sieve. ASTM International, West Conshohocken
3. ASTM D2434-68 (2006) Standard test method for permeability of granular soils (constant head). ASTM International, West Conshohocken
4. ASTM D854–06 (2006) Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer. ASTM International, West Conshohocken, PA
5. ASTM D422-63 (2007) Standard test method for particle-size analysis of soils. ASTM International, West Conshohocken