UFC 3-260-02
30 June 2001
Table 8-5
Minimum Surface and Aggregate Base-Course Thickness Requirements for Air Force Flexible
Pavement Airfields, Inches
80 CBR Base1,2,3
100 CBR Base
Surface
Base
Total
Surface
Base
Total
Airfield Type
Traffic Area
11
6
5
10
6
4
Light load
A
11
6
5
10
6
4
B
10
6
4
9
6
3
C
8
6
2
8
6
2
Shoulders
11
6
5
10
6
4
Medium load
A
11
6
5
10
6
4
B
10
6
4
9
6
3
C
9
6
3
9
6
3
D
8
6
2
8
6
2
Shoulders
15
9
6
15
10
5
Heavy load
A
14
8
6
14
9
5
B
13
8
5
13
9
4
C
9
6
3
9
6
3
D
8
6
2
8
6
2
Shoulders
14
8
6
13
8
5
Modified
A
14
8
6
13
8
5
heavy load
B
13
8
5
12
8
4
C
9
6
3
9
6
3
D
8
6
2
8
6
2
Shoulders
Shortfield
A
4
6
10
5
6
11
9
6
3
9
6
3
Auxiliary
A
9
6
3
9
6
3
B
9
6
3
9
6
3
C
8
6
2
8
6
2
Shoulders
Note: When the underlying subbase has a design CBR of 80, the minimum base-course thickness will
be 6 inches.
1
Restricted to Florida limerock for heavy load pavements and modified heavy load pavements except
that graded crushed aggregate (80 CBR) or cement modified or bituminous modified aggregate will be
permitted in type D traffic areas.
2
Florida limerock or graded crushed aggregate (80 CBR) cement modified or bituminous modified
aggregates permitted in type B, C, and D traffic areas for medium load pavements.
3
Florida limerock or graded crushed aggregate (80 CBR), cement modified or bituminous modified
permitted for light load, shortfield, and auxiliary pavements.
Conversion Factor: Millimeters = 25.4 inches.
8-7
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