Plasticity index of A-7-6 subgroup is greater than LL - 30. Plasticity index of A-7-5 subgroup is equal to or less than the LL - 30. Usual types of significant constituent materials 200) sieve)Ĭharacteristics of fraction passing 0.425 mm (No. ![]() Silt- Clay Materials (>35% passing the 0.075 mm (No. Granular Materials (35% or less passing the 0.075 mm (No. The classification system was first developed by Hogentogler and Terzaghi in 1929, but has been revised several times since.ĪASHTO Soil Classification System (from AASHTO M 145 or ASTM D3282) The AASHTO Soil Classification System was developed by the American Association of State Highway and Transportation Officials, and is used as a guide for the classification of soils and soil-aggregate mixtures for highway construction purposes.
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