1. ASTM D2487 (2017) Standard practice for classification of soils for engineering purposes. ASTM D2487, ASTM International, West Conshohocken, PA, USA
2. ASTM D4219–08 (2008) Standard test method for unconfined compressive strength index of chemical-grouted soils. ASTM International, West Conshohocken, PA, USA
3. ASTM D422–63 (2007) Standard test method for particle-size analysis of soils. ASTM D422–63, ASTM International, West Conshohocken, PA, USA
4. ASTM D4318-17e1 (2017) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM D4318-17e1, ASTM International, West Conshohocken, PA, USA
5. ASTM D4972–19 (2019) Standard test methods for pH of soils. ASTM D4972-19, ASTM International, West Conshohocken, PA, USA