Table 8-3.1 Typical Engineering Properties of Compacted Materialsa
Typical Value of
Compression
(Percent of
Range of
Range of
Typical
Range
Range of
Original Height)
Typical Strength Characteristics
Maximum
Optimum
Coefficient
of CBR
Subgrade
Dry Unit
Water,
of
Values
Modulus k
At 138
At 345
Cohesion
Cohesion
Effective
Weight,
Content
Permeability
kPa/mm
Group
Soil Type
kPa
kPa
(as
(saturated)
Stress
gm/cm3
Percent
cm/sec
(lb/cu in)
Symbol
(20 psi)
(50
compacted)
kPa (psf)
Envelope
(pcf)
(ft/min)
psi)
kPa (psf)
deg
2.5 x 10-5
SM
Silty sands,
10-40
21-81
1.76-2.00
16-11
0.8
1.6
50 (1050)
20 (420)
34
(5 x 10-5)
poorly
(100-300)
(110-125)
graded
sand-salt
mix
1 x 10-6
SM-SC
Sand-silt
-----
------
1.76-2.08
15-11
0.8
1.4
50 (1050)
14 (300)
33
(2x10-6)
clay mix
(110-130)
with slightly
plastic fines
2.5 x 10-7
SC
Clayey
5-20
21-81
1.68-2.00
19-11
1.1
2.2
74 (1550)
11 (230)
31
(5x10-7)
sands,
(100-300)
(105-125)
poorly
graded
sand-clay-
mix
5 x 10-6
ML
Inorganic
15 or <
21-54
1.52-1.92
24-12
0.9
1.7
67 (1400)
9 (190)
32
(10-5)
silts and
(100-200)
(95-120)
clayey silts
2.5 x 10-5
ML-CL
Mixture of
-----
21-54
1.60-1.92
22-12
1.0
2.2
65 (1350)
22 (460)
32
(5x10-5)
inorganic silt
(100-200)
(100-200)
and clay
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