Table 5. Physical properties of Mn/ROAD materials.
Organic
content ††
Specific
Atterberg limits**
gravity†
Material
Classification*
LL
PI
(%)
Subgrade
1206
CL, Sandy lean clay
2.70
37.0
18.5
1.5
1232
CL, Sandy lean clay
2.71
26.4
10.9
0.7
Class 3
17.0***
1.2***
stockpile
SW, Well-graded sand
2.69
--
Class 4
TAS†††
SM, Silty sand
2.73
--
--
--
Class 5
DGS†††
23***
3***
GW, Well-graded gravel
2.81
--
with sand
Class 6
stockpile
GW, Well-graded gravel
2.74
--
--
--
* Classification: ASTM D422-63/ASTM D2487-83
†
Specific gravity: ASTM D854-83
**Atterberg limits: ASTM D4318-84
†† Organic content: ASTM D2974-87, Method C; maximum furnace temperature 500C
*** Minus no. 40 sieve fraction.
††† Substitute materials for modeling: TAS: taxiway A subbase; DGS: dense graded stone.
U.S. Std. Sieve Size and No.
Hydrometer
3/4
3
4
10
40
200
100
80
Sample 1206
60
40
Sample 1232
20
0
1.0
0.1
0.01
0.001
100
10
Grain Size (mm)
Gravel
Sand
Silt or Clay
C'rse
Fine
C'rse
Medium
Fine
Figure 10. Grain size distribution in the subgrade materials.
where θu
=
volumetric water content (%)
approach to determine the best fit parameters
θ0
Aw and α (Table 7). The equation employed is
=
soil porosity (%)
hp
=
pore pressure head (cm of water)
as follows:
Aw
=
Gardner's multiplier for the mois-
θ0
ture characteristics
θu =
α
α = Gardner's exponent for the mois-
(2)
+1
Aw hp
ture characteristics.
12
Previous Page
