Geology Reference
In-Depth Information
Table 12-4
Compaction Characteristics and Ratings of Unified Soil Classification Classes for Soil Construction [4, 6]
Maximum Dry Unit
Weight Standard
AASHTO (lb/ft
3
)
Value as
Embankment
Material
Value as
Subgrade
Material
Value as
Base
Course
Compaction
Characteristics
Compressibility
and Expansion
Class
GW
Good: tractor, rubber-tired, steel
wheel, or vibratory roller
125-135
Almost none
Very stable
Excellent
Good
GP
Good: tractor, rubber-tired, steel
wheel, or vibratory roller
115-125
Almost none
Reasonably stable
Excellent to good
Poor to fair
GM
Good: rubber-tired or light
sheepsfoot roller
120-135
Slight
Reasonably stable
Excellent to good
Fair to poor
GC
Good to fair: rubber-tired or
sheepsfoot roller
115-130
Slight
Reasonably stable
Good
Good to fair
SW
Good: tractor, rubber-tired, or
vibratory roller
110-130
Almost none
Very stable
Good
Fair to poor
SP
Good: tractor, rubber-tired, or
vibratory roller
100-120
Almost none
Reasonably stable when
dense
Good to fair
Poor
SM
Good: rubber-tired or sheepsfoot
roller
110-125
Slight
Reasonably stable when
dense
Good to fair
Poor
SC
Good to fair: rubber-tired or
sheepsfoot roller
105-125
Slight to medium
Reasonably stable
Good to fair
Fair to poor
ML
Good to poor: rubber-tired or
sheepsfoot roller
95-120
Slight to medium
Poor stability, high density
required
Fair to poor
Not suitable
CL
Good to fair: sheepsfoot or
rubber-tired roller
95-120
Medium
Good stability
Fair to poor
Not suitable
OL
Fair to poor: sheepsfoot or
rubber-tired roller
80-100
Medium to high
Unstable, should not be used
Poor
Not suitable
MH
Fair to poor: sheepsfoot or
rubber-tired roller
70-95
High
Poor stability, should not be
used
Poor
Not suitable
CH
Fair to poor: sheepsfoot roller
80-105
Very high
Fair stability, may soften on
expansion
Poor to very poor
Not suitable
OH
Fair to poor:
sheepsfoot roller
65-100
High
Unstable, should not be used
Very poor
Not suitable
PT
Not suitable
—
Very high
Should not be used
Not suitable
Not suitable
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