UFC 3-260-02
30 June 2001
Table 10-1
Example Design Using Mixed Traffic
(8)
(7)
(6)
(5)
(4)
(3)
(1)
(2)
Column 4
Column 6
Allowable
Preliminary
Gross
Divided by
Divided by
Passes
Thickness
Aircraft
Weight
Figure
Column 7
1,000
at 25 in.
in.
Passes
kg (kips)
No.
Aircraft
B-52
10-32
136,080
300
21.5
1,200
1.20
250
(300)
C-141
10-28
145,150
1,000
25.0
1,000
1.0
1,000
(320)
P-3
10-9
64,410
5,000
24.0
7,500
7.5
660
(142)
F-15
10-26
31,750
200,000
25.0
200,000
200
1,000
(70)
OV-1
10-3
6,800
1,000,000
12.5
Unlimited
--
--
(15)
Total passes on basis of C-141 aircraft = 2,910
Conversion Factor: Millimeters = 25.4 inches; kilograms = 453.6 kips
a. Navy and Marine Corps Design.
(1) Thickness reduction factors. Stabilized base course and subbase course materials
meeting the requirements for strength and durability in Chapter 8 may be substituted for unstabilized
materials. Procedures for pavement design with stabilized layers are as follows:
(a)
Design a conventional pavement section as previously described.
(b) Convert the base or subbase courses into equivalent thicknesses of stabilized
materials by use of the equivalency factors shown in Chapter 9.
(c) Adjust the thicknesses of stabilized base and subbase courses so that the minimum
base course thickness requirements are met.
(2) Design examples. Design a primary traffic area pavement section for a C-5A aircraft with
a gross weight of 385,560 kilograms (850 kips) at 100,000 passes. Design CBR of subgrade is 5; CBR
of unstabilized subbase is 20; CBR of unstabilized base is 100.
(a) Alternative design 1, Conventional Section. From Figure 10-18 the required
conventional pavement section is 1,093 millimeters (43 inches) for a subgrade CBR of 5, and the
required cover over the subbase is 355 millimeters (14 inches). The required minimum thickness of
base and surface from Table 8-3 is 203 millimeters (8 inches) of aggregate base course and
102 millimeters (4 inches) of AC surface. The conventional section is as follows:
10-6
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