WSDOT Gradation Specifications

Aggregate for Unbound Granular Applications - See Plot Below

Sieve Size Percent Passing
Ballast Shoulder Ballast Base Course Top Course
63.0 mm 2.5-inch 100 100 - -
50.0 mm 2-inch 65 - 100 65 - 100    
31.5 mm 1.25-inch - - 100 -
25 mm 1-inch 50 - 85   80 - 100  
19.0 mm 0.75-inch - 40 - 80 - 100
16 mm 0.625-inch - - 50 - 80 -
12.5 mm 0.5-inch -     90 - 100
4.75 mm No. 4 26 - 44 5 max 25 - 45 46 - 66
0.425 mm No. 40 16 max - 3 - 18 8 - 24
0.150 mm No. 100 - 2 max - -
0.075 mm No. 200 9.0 max - 7.5 max 10.0 max

Aggregate for HMA (Hveem Mixes) - See Plot Below

Sieve Size Percent Passing
Class A & B Class D Class E Class F Class G
50 mm 2-inch - - - - -
37.5 mm 1.5-inch - - - - -
31.5 mm 1.25-inch - - 100 - -
25 mm 1-inch - - 90 - 100 - -
19.0 mm 0.75-inch 100 - - 100 -
16 mm 0.625-inch - - 67 - 86 - -
12.5 mm 0.5-inch 90 - 100 100 60 - 80 80 - 100 100
9.5 mm 0.375-inch 75 - 90 97 - 100 - - 97 - 100
4.75 mm No. 4 46 - 66 30 - 50 34 - 56 38 - 70 50 - 78
2.36 mm No. 8 - 5 - 15 - - -
2.00 mm No. 10 30 - 42 - 25 - 40 30 - 50 32 - 53
0.425 mm No. 40 11 - 24 - 10 - 23 - 11 - 24
0.075 mm No. 200 3.0 - 7.0 2.0 - 5.0 2.0 - 9.0 2.0 - 8.0 3.0 - 7.0

 

Aggregate for HMA (Superpave Mixes) - See Plot Below

Sieve Size Percent Passing

25 mm
(1 inch)

19.5 mm
(0.75 inch)

12.5 mm
(0.5 inch)

9.5 mm
(0.375 inch)
50 mm 2-inch 100 min      
37.5 mm 1.5-inch 90 - 100      
31.5 1.25-inch        
25 mm 1-inch 90 max 100 min    
19.0 mm 0.75-inch   90 - 100 100 min  
16 mm 0.625-inch        
12.5 mm 0.5-inch   90 max 90 - 100 100 min
9.5 mm 0.375-inch     90 max 90  - 100
4.75 mm No. 4       90 max
2.36 mm No. 8 19 - 45 23 - 49 28 - 58 32 - 67
2.00 mm No. 10        
0.425 mm No. 40        
0.075 mm No. 200 1.0 - 7.0 2.0 - 7.0 2.0 - 7.0 2.0 - 7.0

Fine Aggregate for PCC - See Plot Below

Sieve Size Percent Passing

Class 1

Class 2
9.5 mm 0.375-inch 100 min 100 min
4.75 mm No. 4 95 - 100 95 - 100
2.36 mm No. 8 68 - 86 -
1.18 mm No. 16 47 - 65 45 - 80
 0.600 mm No. 30 27 - 42 -
 0.300 mm No. 50 9 - 20 10 - 30
0.150 mm No. 100 7 max 2 - 10
0.075 mm No. 200 2.5 max 2.5 max

 

Coarse Aggregate for PCC - See Plot Below

Sieve Size

Percent Passing

AASHTO
No. 476

AASHTO
No. 57

AASHTO
No. 67

AASHTO
No. 7

AASHTO
No. 8
50 mm 2-inch

100 min

-

-

-

-
37.5 mm 1.5-inch

95 - 100

100 min

-

-

-
25 mm 1-inch

-

95 - 100

100 min

-

-
19.0 mm 0.75-inch

35 - 70

-

90 - 100

100 min

-
12.5 mm 0.5-inch

-

25 - 60

-

90 - 100

100 min
9.5 mm 0.375-inch

10 - 30

-

20 - 55

40 - 70

85 - 100
4.75 mm No. 4

5 max

10 max

10 max

15 max

10 - 30
2.36 mm No. 8

-

5 max

5 max

5 max

10 max
1.18 mm No. 16

-

-

-

-

5 max

Aggregate for BST - See Plot Below

Sieve Size Percent Passing

Cover Stone

 Crushed Screening

3/4" - 1/2"

5/8" - No. 4

1/2" - No. 4

3/8" - No. 10

 No. 4 - 0"
25 mm 1-inch   100 min - - - -
19.0 mm 0.75-inch 100 min 95 - 100 100 - - -
16 mm 0.625-inch 95 - 100 - 95 - 100 100 max - -
12.5 mm 0.5-inch - 20 max - 95 - 100 100 max -
9.5 mm 0.375-inch - 5 max - - 90 - 100 100 max
4.75 mm No. 4 25 - 45 - 10 max 15 max 30 - 56 76 - 100
2.00 mm No. 10 - - 3 max 3 max 10 max 30 - 60
0.075 mm No. 200 7.5 max 1.5 max 1.5 max 1.5 max 1.5 max 10 max