Table 8. Test sections and conditions analyzed.
Water table
Mn/ROAD
Depth
Simulation
test section
m (ft)
case
Other variations
FLEXIBLE
5-year
ML5-F-1
2.7 (9)
f1w9
ML5-F-2
2.7 (9)
f2w9
ML5-F-2
6.1 (20)
f2w20
ML5-F-3
2.4 (8)
f3w8
ML5-F-3
6.1 (20)
f3w20
ML5-F-4
1.8 (6)
f4w6
ML5-F-4
1.8 (6)
f4w6ld
Low density subgrade
ML5-F-4
1.8 (6)
f4w6ss
No. 1232 subgrade
10-year
ML10-F-14
15.3 (50)
f14w50
ML10-F-19
5.5 (18)
f19w18
ML10-F-21
5.5 (18)
f21w18
ML10-F-21
13.7 (45)
f21w45
ML10-F-22
13.7 (45)
f22w45
RIGID
5-year
ML5-R-5
1.8 (6)
r5w6
ML5-R-5
3.7 (12)
r5w12
ML5-R-6
1.2 (4)
r6w4
ML5-R-6
3.7 (12)
r6w12
10-year
ML10-R-11
1.8 (6)
r11w6
ML10-R-11
3.7 (12)
r11w12
Material properties
New York, airport most closely matched the class
Material properties input to the FROST pro-
4 special subbase specifications; dense-graded
gram are shown in Table 9. The soil water charac-
stone, which had been tested during a cooperative
teristics are based on a best fit to the moisture
study in Winchendon, Massachusetts, most closely
retention test data using the Gardner's eq 2. Soil
matched the class 5 special material. Results of
residual moisture contents were calculated using
the characterization tests of the substitute materi-
eq 2 with a pressure of 800 cm water. The soil
als are also given in Bigl and Berg (1996a) and in
permeability characteristics result from fitting the
Cole et al. (1986, 1987).
Gardner's eq 3 to unsaturated hydraulic conduc-
The densities of the Mn/ROAD materials, which
tivity test results.
had been characterized with compaction testing,
As part of this study, Mn/DOT class 3 special,
were set at the optimum values. For the substitute
class 6 special, and two subgrade materials had
materials, the densities were set at the values de-
been tested to determine the information for input
termined from in-place samples taken from the
to the model. Results of the soil characterization
site. To demonstrate the influence of proper com-
tests are given in Bigl and Berg (1996a). The class
paction, one simulation (case f4w6ld) involved
4 special and class 5 special materials were not
setting the density of the 1206 subgrade to a re-
duced value less than optimum (1.69 Mg/m3, 105.5
tested, so their behavior had to be approximated
lb/ft3). Optimum density was set at 1.89 Mg/m3
using data from previously tested materials that
(117.9 lb/ft3), determined with a compactive ef-
most closely matched their specified size grada-
fort of 2360 kJ/m3 (55,000 ft-lb/ft3).
tions. A subbase from taxiway A at the Albany,
16
Previous Page
