percentages passing various sieves may be directed by the Contracting
Officer when aggregates vary more than 0.2 in specific gravity.
TABLE I.
AGGREGATE GRADATION
Percent Passing by Weight of Total Aggregates
_____________________________________________
Gradation "A",
Gradation "B",
19 mm Maximum
13 mm Maximum
Sieve Designation
(Compacted Nominal
(Compacted Nominal
(mm Openings)
Thickness, 25 mm)
Thickness, 19 mm)
_________________
__________________
_________________
19
100
100
12.5
70-100
100
9.5
45-75
80-100
4.75
25-40
25-40
2.36
10-20
10-20
0.60
3-10
3-10
0.075
0-5
0-5
TABLE I.
AGGREGATE GRADATION
Percent Passing by Weight of Total Aggregates
_____________________________________________
Gradation "A",
Gradation "B",
3/4 inch Maximum
1/2 inch Maximum
Sieve Designation
(Compacted Nominal
(Compacted Nominal
(Square Openings)
Thickness, 1 inch)
Thickness, 3/4 inch)
_________________
__________________
____________________
3/4
inch
100
100
1/2
inch
70-100
100
3/8
inch
45-75
80-100
No.
4
25-40
25-40
No.
8
10-20
10-20
No.
30
3-10
3-10
No.
200
0-5
0-5
2.1.1
Coarse Aggregate
Coarse aggregate shall consist of clean, sound, durable particles meeting
the following requirements.
2.1.1.1
Abrasion
**************************************************************************
NOTE: The Los Angeles abrasion test is used in
excluding aggregates known to be unsatisfactory or
for evaluating aggregates from new sources. The
percentage of loss will be inserted in the blanks.
The values inserted will be based on aggregates in
the area that have been previously approved or that
have a satisfactory service record in bituminous
pavement construction for at least 5 years. Upper
limits of 25 percent for airfields and 40 percent
for roads are recommended.
SECTION 02747
Page 11
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