1. ASTM D 1557-91: “Test method for laboratory compaction characteristics of soils using modified effort (56000 ft-lbf/ft3 (2700 kN- m/m3))”
2. ASTMD 2217-85: “Standard practice for wet preparation of soil samples for particle-size analysis and determination of soil constants”
3. ASTM D2487-93: “Standard classification of soils for engineering purposes (Unified soil classification system)”
4. ASTM D4254-91: “Standard test method for minimum index density and unit weight of soils and calculation of relative density”
5. Developments in microcomputer controlled stress path testing equipment for measurement of soil parameters;Atkinson;Ground Engineering,1985