1. American Association of State Highway Transportation Officials (AASHTO). Standard Specifications for Highway Bridges. AASHTO 2002.
2. American Association of State Highway Transportation Officials (AASHTO). LRFD bridge construction specifications. Washington, DC: American Association of State Highway and Transportation officials 2010.
3. Standard Test Methods for Compressive Strength of Molded Soil-Cement Cylinders. ASTM International; 2017.
4. ASTM. ASTM D2487-11 Standard practice for classification of soils for engineering purposes (unified soil classification system). ASTM International; 2011.
5. Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading ASTM International 2008; 08 (04). https://doi.org/10.1520/D2412-11.2.