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
Airfield Type
Traffic Area
Surface
Base
Total
Surface
Base
Total
Light load
A
4
6
10
5
6
11
B
4
6
10
5
6
11
C
3
6
9
4
6
10
Shoulders
2
6
8
2
6
8
Medium load
A
4
6
10
5
6
11
B
4
6
10
5
6
11
C
3
6
9
4
6
10
D
3
6
9
3
6
9
Shoulders
2
6
8
2
6
8
6
9
15
15
Heavy load
A
5
10
14
6
8
14
B
5
9
13
13
5
8
C
4
9
6
9
9
3
D
3
6
8
8
2
6
6
Shoulders
2
8
14
6
13
8
5
Modified
A
14
8
13
6
8
heavy load
B
5
13
8
12
5
8
4
C
9
6
9
3
6
3
D
8
6
2
8
6
2
Shoulders
Shortfield
A
4
6
10
5
6
11
Auxiliary
A
3
6
9
3
6
9
B
3
6
9
3
6
9
C
3
6
9
3
6
9
Shoulders
2
6
8
2
6
8
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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