1. ASTM, 2007. D422 – 63; Standard Test Method for Particle-Size Analysis of Soils.
2. ASTM, 2011. D3080 – 11; Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions.
3. ASTM, 2012. D698 – 12; Standard test methods for laboratory compaction characteristics of soil using standard effort.
4. ASTM, 2017. D2487 − 17; Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System).
5. ASTM, 2017. D4318 - 17; Standard test methods for liquid limit, plastic limit, and plasticity index of soils.