1. ASTM D1557 (2015) Standard test methods for laboratory compaction characteristics of soil using modified Effort (56,000 ft-lbf/ft3 (2,700 kN-m/m3)). Annual Book of Standards 4
2. ASTM D2487-11 (2011) Standard practice for classification of soils for engineering purpose (unified soil classification system).
www.astm.org
3. ASTM D422–63 (2007) Standard test method for particle-size analysis of soils. ASTM International, West Conshohocken, p 1520
4. ASTM D4318 (2010) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM International, West Conshohocken, PA, 2003.
https://doi.org/10.1520/D4318-10
5. ASTM E1755-01 (2007) Standard method for the determination of ash in biomass. Annual Book of ASTM Standards 11(5), ASTM International, Philadelphia, PA.
www.astm.org