1. ASTM D2166 (2013) Standard test method for unconfined compressive strength of cohesive soil. West Conshohocken, PA, USA
2. ASTM D2487 (2011) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). West Conshohocken, PA, USA
3. ASTM D422 (2007) Standard test method for particle-size analysis of soils, american society for testing and materials. West Conshohocken, PA, USA
4. ASTM D4318 (2017) Standard test methods for liquid limit, plastic limit, and plasticity index of soils, american society for testing and materials. West Conshohocken, PA, USA
5. ASTM D4643 (2017) Standard test method for determination of water content of soil and rock by microwave oven heating. West Conshohocken, PA, USA