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Percentage of loss shall not exceed [_____] after 500 revolutions, as
determined in accordance with ASTM C 131.
2.1.1.2
Crushed Slag
Slag shall be air-cooled blast furnace slag. Other slag will not be
permitted. The dry weight of crushed slag shall not be less than 1200
kg/cubic meters 75 pcf, as determined in accordance with ASTM C 29/C 29M.
2.1.1.3
Crushed Gravel
Crushed gravel retained on the 4.75 mm No. 4 sieve and each coarser sieve
shall contain at least 90 percent by weight of crushed pieces having at
least one fractured face and 75 percent by weight of crushed pieces having
two or more fractured faces, with the area of each face equal to at least
75 percent of the smallest midsectional area of piece. When two fractures
are contiguous, the angle between planes of fractures shall be at least 30
degrees to count as two fractured faces.
2.1.1.4
Particle Shapes
Particle shape of crushed aggregates shall be essentially cubical. The
quantity of flat and elongated particles in any sieve size shall not exceed
8 percent by weight when determined in accordance with ASTM D 4791.
2.1.1.5
Aggregate Soundness
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NOTE: The values of percentage of loss will be
based on knowledge of aggregates in the area that
have been previously approved or that have a
satisfactory service record in PFCs or other
bituminous pavements of at least 5 years.
For airfield pavements, the percentage of soundness
loss shall not exceed 12 percent. This should not
be confused with the less restrictive 18 percent for
dense graded mixtures.
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Percentage of loss shall not exceed [_____] after five cycles performed in
accordance with ASTM C 88, using magnesium sulfate.
2.1.2
Fine Aggregate
Fine aggregate shall consist of clean, sound, durable, angular particles
produced by crushing stone, slag, or gravel that meets quality requirements
specified for coarse aggregate. Fine aggregate produced by crushing gravel
shall have at least 90 percent by weight of crushed particles having two or
more fractured faces in the portion retained on the 0.6 mm No. 30 sieve.
This requirement shall apply to material before blending with natural sand,
when blending is necessary. The quantity of natural sand to be added to
the PFC shall not exceed 5 percent by weight of total aggregate. Natural
sand shall be clean and free from clay and organic matter.
SECTION 02747
Page 12
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