UFC 3-260-02
30 June 2001
Table 3-2
Gradation for Aggregate Surface Courses (Percent Passing)
Sieve Designation
No. 1
No. 2
No. 3
No.4
25.0 mm (1")
100
100
100
100
9.5 mm (3/8")
50-85
60-100
No. 4
35-65
50-85
55-100
70-100
No. 10
25.50
40.70
40-100
55-100
No. 40
15.30
24-45
20-50
30-70
No. 200
8-15
8-15
8-15
8-15
Note: The percent by weight finer than 0.02 millimeter (0.04 inch) shall not exceed 3 percent.
Table 3-3
Maximum Permissible Values for CBR and Gradation Requirements
Maximum
Maximum
Maximum % Passing
Maximum
Maximum
Liquid
#10
#200
Index*
Material
CBR
Size
Limit*
Subbase
50
50 mm (2")
50
15
25
5
Subbase
40
50 mm (2")
80
15
25
5
Subbase
30
50 mm (2")
100
15
25
5
Select Material
20
75 mm (3")
--
--
35
12
* ASTM D 4318.
Table 3-4
Frost Design Soil Classification
Percentage Finer
Frost
Than 0.02 mm (0.04")
Unified Soil Classification Soil
Group
Type Soil
by Weight
Types***
NGS*
(a) Gravels
0-1.5
GW, GP
Crushed Stone
Crushed rock
(b) Sands
0-3
SW, SP
(Continued)
3-7
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