1. Standard Test Method for pH of Soils;ASTM,2007
2. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System);ASTM,2010
3. Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils;ASTM,2010
4. Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer;ASTM,2010
5. Standard Test Method for Measuring the Exchange Complex and Cation Exchange Capacity of Inorganic Fine-grained Soils;ASTM,2010