UFC 3-260-02
30 June 2001
Table 11-3
Bituminous Concrete Moduli for Each Month for Conventional Flexible Pavement Design Based
on Subgrade Strain
Average Daily
Dynamic
Average Daily
Modulus4
Maximum Air
Design Air
Design Pavement
Mean Air
*E**
Temperature,1
Temperature,2
Temperature,2
Temperature,3
103 psi
degrees F
degrees F
degrees F
degrees F
Month
(2)
(3)
(4)
(5)
(6)
(1)
Jan
47.5
56.4
52
60
1,270
Feb
50.7
60.1
55
64
1,060
Mar
58.0
68.0
63
72
700
Apr
66.1
76.0
71
81
420
May
73.3
83.2
78
90
250
Jun
80.5
90.4
85
97
160
Jul
83.1
92.9
88
100
130
Aug
82.7
92.8
88
100
130
Sep
77.3
87.4
82
94
190
Oct
67.2
78.1
73
83
380
Nov
56.2
66.4
61
71
720
Dec
49.3
58.3
54
61
1,200
1
Determined from local climatological data for Shreveport, LA.
2
Average of values from columns 2 and 3.
3
Estimated from 5-inch bituminous concrete thickness curve in Figure 6-1. (Figure 6-1 is entered with
the appropriate design air temperature.)
4
Determined by laboratory testing of bituminous concrete.
Conversion Factors: degrees C = degrees F - 32/1.8, megapascals = 0.006894 psi
thickness, base thickness, and subbase thickness. The section for a thickness of 760 millimeters
(30 inches) is shown in Figure 11-13 as an example.
(2) For runway design, thicknesses of 510, 610, and 660 millimeters (20, 24, and 26 inches)
are assumed for the initial sections for computing the subgrade damage factor. The section for
610 millimeters (24 inches) is shown in Figure 11-14. In the initial section, a 13-millimeter (5-inch)
asphalt layer is assumed for the taxiway design, and a 10-millimeter (4-inch) asphalt layer is assumed
for the runway design. After determining the total thickness required for these asphalt thicknesses, the
design can be refined for other asphalt thicknesses.
c. Step 3 - Computation of Strains.
11-12
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