Field Identification Fine Grained Soils

Dry Strength Dilatancy Toughness Plasticity Symbol

None to low

Slow to rapid

Low or no thread

Nonplastic to low

ML

Medium to high

Slow

Medium

Low to medium

CL

Low to medium

None to slow

Low (spongy)

None to low

OL

Medium

None to slow

Low to medium

Low to medium

MH

Very high

None

High

Medium to high

CH

Medium to high

None

Low to medium (spongy) Medium to high

OH

Highly organic soils Primarily organic matter, dark in color, spongy feel,

PT

organic odor, and often fibrous texture

1/ To classify as Fine-grained, more than half the material (by weight) must consist of fines

(material finer than the no. 200 sieve) .

Copyright ASTM. Reprinted with permission

Copyright ASTM. Reprinted with permission

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