1. ASTM C618-03 (2003) Standard specification for coal fly ash and raw or calcined natural pozzolan for use as a mineral admixture in portland cement concrete. American Society for Testing of Materials, Pennsylvania
2. ASTM D698-07e1 (2007) Standard test methods for laboratory compaction characteristics of soil using standard effort. American Society for Testing of Materials, Pennsylvania
3. ASTM D2166–06 (2006) Standard test method for unconfined compressive strength of cohesive soil. American Society for Testing of Materials, Pennsylvania
4. ASTM D2487-10 (2010) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). American Society for Testing of Materials, Pennsylvania
5. ASTM D4318-10 (2010) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. American Society for Testing of Materials, Pennsylvania, USA