possible. A 25 mm (1-inch) nominal maximum
aggregate size may be used to avoid durability
problems associated with some larger size aggregate.
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The nominal maximum size of the coarse aggregate shall be [37.5] [_____] mm
[1.5] [_____] inches. When the nominal maximum coarse size is greater than
25 mm 1 inch, the coarse aggregates shall be graded and furnished in two
size groups meeting the individual grading requirements of ASTM C 33, Size
No. 4 (37.5 to 19.0 mm) (1.5 to 0.75 inches) and Size No. 67 (19.0 to 4.75
mm) (0.75 inches to No. 4).
2.2.2.4
Deleterious Materials - Airfield Pavements
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NOTE: Include these deleterious material
requirements for airfield paving projects only,
otherwise, delete. In Table 5 select columns
showing appropriate percentage by weight in
accordance with the following. Delete the
inapplicable column in the table and the heading of
the column used.
Air Freezing
Average
Index
Weather
Coldest year
Single Month during
Severity
in 30 (a)
the Freezing Period
_____________
________________
________________________
Moderate
500 or less
Any Amount
Moderate (b)
501 or more
Less than 25 mm (1 inch)
Severe
501 or more
25 mm (1 inch) or more
(a) Calculated as described in TM 5-852-1. See
ASTM C 33 for simplified map of CONUS weather
severity.
(b) In poorly drained areas, the weather should be
considered severe even though the other criteria
indicate a rating of moderate.
(c) For Navy projects, select "Negligible Weather"
column of Table 5. Delete the inapplicable columns
and delete paragraphs a through h.
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The amount of deleterious material in each size group of coarse aggregate
shall not exceed the limits shown in Table 5 below, determined in
accordance with the test methods shown.
SECTION 02753
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