In no case should the limit be set less than 43.
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Fine aggregate shall consist of clean, sound, tough, durable particles.
The aggregate particles shall be free from coatings of clay, silt, or any
objectionable material and shall contain no clay balls. The fine aggregate
particles shall meet the following requirements:
a. The quantity of natural sand (noncrushed material) added to the
aggregate blend shall not exceed 15 percent by weight of total
aggregate.
b. The individual fine aggregate sources shall have a sand equivalent
value greater than 45 when tested in accordance with ASTM D 2419.
c. The fine aggregate portion of the blended aggregate shall have an
uncompacted void content greater than 45.0 percent when tested in
accordance with ASTM C 1252 Method A.
d. Clay lumps and friable particles shall not exceed 0.3 percent, by
weight, when tested in accordance with ASTM C 142.
2.1.3
Mineral Filler
Mineral filler shall be nonplastic material meeting the requirements of
ASTM D 242.
2.1.4
Aggregate Gradation
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NOTE: Delete from Table 2, the gradations that will
not be used as a part of this project. Generally,
the layer thickness should be at least 57 mm (2.25
inches) for gradation 1, 37 mm (1.5 inches) for
gradation 2 and 25 mm (1 inch) for gradation 3 shown
in Table 2. Use of gradation 3 shall be limited to
shoulders and leveling courses.
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The combined aggregate gradation shall conform to gradations specified in
Table 2, when tested in accordance with ASTM C 136 and ASTM C 117, and
shall not vary from the low limit on one sieve to the high limit on the
adjacent sieve or vice versa, but grade uniformly from coarse to fine.
Table 2.
Aggregate Gradations
Gradation 1
Gradation 2
Gradation 3
Percent Passing
Percent Passing
Percent Passing
Sieve Size, mm
by Mass
by Mass
by Mass
25.0
100
---
---
19.0
76-96
100
---
12.5
68-88
76-96
100
9.5
60-82
69-89
76-96
4.75
45-67
53-73
58-78
2.36
32-54
38-60
40-60
1.18
22-44
26-48
28-48
0.60
15-35
18-38
18-38
SECTION 02749
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