1. ASTM D 2166-06 (2006). Standard test method for unconfined compressive strength of cohesive soil, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA., USA.
2. ASTM D 422-63 (2007). Standard test method for particle-size analysis of soils, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA., USA.
3. ASTM D 4318-10 (2010). Standard test methods for liquid limit, plastic limit, and plasticity index of soils, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA., USA.
4. ASTM D 698-07 (2007). Standard test methods for laboratory compaction characteristics for soil using standard effort (12,400 ft-lbf/ft 3 (600 kN-m/m 3 )), Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA., USA.
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