AASHTO Soil Classification System
AASHTO Soil Classification System
| General Classification | Granular Materials (35% or less passing the 0.075 mm sieve) | Silt-Clay Materials (>35% passing the 0.075 mm sieve) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Group Classification | A-1 | A-3 | A-2 | A-4 | A-5 | A-6 | A-7 | |||||
| A-1-a | A-1-b | A-2-4 | A-2-5 | A-2-6 | A-2-7 | A-7-5 A-7-6 | ||||||
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