UFC 3-260-02
30 June 2001
7. MINIMUM THICKNESS REQUIREMENTS FOR FLEXIBLE PAVEMENTS. The minimum allowable
thicknesses for aggregate base courses in flexible pavements are listed in Table 8-3 for Army airfields,
Table 8-4 for Navy and Marine Corps airfields, and Table 8-5 for Air Force airfields. These thicknesses
have been established so that the required subbase CBR will always be 50 or less.
Table 8-3
Minimum Surface and Aggregate Base-Course Thickness Requirements for Army Flexible
Pavement Airfields, Inches
80 CBR Base1
100 CBR Base
Airfield Heliport Class
Traffic Area
Surface
Base
Total
Surface
Base
Total
I
B
2
6
8
2
6
8
II
B
2
6
8
3
6
9
III
A
2
6
8
2
6
8
B
2
6
8
2
6
8
C
2
6
8
2
6
8
IV
A
4
6
10
5
6
11
(Runway # 5,000 feet)
B
4
6
10
5
6
11
C
3
6
9
4
6
10
IV
4
6
10
5
6
11
A
(Runway > 5,000 feet)
B
4
6
10
5
6
11
C
3
6
9
4
6
10
IV
A
4
6
10
5
6
11
(Runway $ 9,000 feet)
B
4
6
10
5
6
11
C
3
6
9
4
6
10
V
B
2
6
8
3
6
9
1
Florida limerock and graded crushed aggregate (80 CBR) permitted.
Conversion Factor: Millimeters = 25.4 inches
Table 8-4
Minimum Flexible Pavement Surface and Aggregate Base-Course Thickness Requirements for
Navy and Marine Corps Flexible Pavement Airfields
Minimum Thicknesses, mm (in.)
Tire Pressure
Aircraft Gross Weight kg (kips)
Base1
Total
MPa (psi)
Surface
< 5,440 (<12)
All pressures
50 (2)
152 (6)
203 (8)
5,440 to 13,600 (12 to 30)
<1.38 (200)
76 (3)
152 (6)
228 (9)
5,440 to 13,600 (12 to 30)
1.38 (200)
or greater
102 (4)
203 (8)
305 (12)
>13,600 (>30)
All pressures
102 (4)
203 (8)
305 (12)
1
Unbound or stabilized.
8-6
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