1. AASHTO (2017) LRFD Bridge construction specifications, 4th edition. American Association of State Highway and Transportation Officials, Washington DC, USA
2. ASTM D854–14 (2014) Standard test methods for specific gravity of soil solids by water pycnometer. ASTM D854-14, ASTM International, West Conshohocken, PA, USA
3. ASTM D2487-17e1 (2017) Standard practice for classification of soils for engineering purposes (unified soil classification system). ASTM D2487-17e1, 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 D8169M-18 (2018) Standard test methods for deep foundations under bi-directional static axial compressive load. ASTM D8169M-18, ASTM International, West Conshohocken, PA, USA