1. AASHTO, M 147. Standard specification for materials for aggregate and soil–aggregate subbase, base, and surface courses; 2012.
2. AASHTO, T 85. “Standard method of test for specific gravity and absorption of coarse aggregate; 2014.
3. AASHTO, T 87. Dry preparation of disturbed soil and soilaggregate samples for test; 2014.
4. AASHTO, T 89. Standard method of test for determining the liquid limit of soils; 2013.
5. AASHTO, T 90. Standard method of test for determining the plastic limit and plasticity index of soils; 2014.