Soil Classification: USCS
USCS and AASHTO soil classification group symbols with grain size criteria, plasticity limits, drainage class, and typical engineering behavior for geotechnical design
| classification system | group symbol | aashto equivalent | cbr typical pct (%) | drainage class | fines pct passing 200 | group name | liquid limit min (%) | notes | plasticity index max (%) | typical engineering behavior |
|---|---|---|---|---|---|---|---|---|---|---|
| USCS | CH | A-7-6 | <3 | Impervious | >50 | Clay of high plasticity | >50 | LL>=50 AND plots above A-line AND PI>=7; fat clay (montmorillonite common) | >7 | Very poor; high shrink-swell; high compressibility; low to medium undrained strength |
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