TABLE 5
LIMITS OF DELETERIOUS MATERIALS IN COARSE AGGREGATE
FOR AIRFIELD PAVEMENTS
Percentage by Mass
Severe
Moderate Negligible
Materials (h)
Weather Weather
Weather
____________
_______________________________________
Clay lumps and friable
0.2
0.2
1.0
particles (ASTM C 142)
Shale (a) (ASTM C 295)
0.1
0.2
--
Material finer than 0.075 mm
0.5
0.5
1.0
(No. 200 sieve) (b) (ASTM C 117)
Lightweight particles (c)
0.2
0.2
1.0
(ASTM C 123)
Clay ironstone (d)
0.1
0.5
--
(ASTM C 295)
Chert and cherty stone (less than
0.1
0.5
--
2.40 Mg/cubic meter density SSD
(2.40 Sp. Gr.)) (e)
( ASTM C 123) followed by ASTM C 295)
Claystone, mudstone, and
0.1
0.1
--
siltstone (f) (ASTM C 295)
Shaly and argillaceous
0.2
0.2
--
limestone (g) (ASTM C 295)
Other soft particles
1.0
1.0
1.0
(COE CRD-C 130)
Total of all deleterious
1.0
2.0
3.0
substances exclusive of material
finer than 0.075 mm (No. 200 sieve)
a. Shale is defined as a fine-grained, thinly laminated or fissile
sedimentary rock. It is commonly composed of clay or silt or both. It
has been indurated by compaction or by cementation, but not so much as
to have become slate.
b. Limit for material finer than 0.075 mm (No. 200 sieve) will be
increased to 1.5 percent for crushed aggregates if the fine material
consists of crusher dust that is essentially free from clay or shale.
c. The separation medium shall have a density of 2.0 Mg/cubic meter
(Sp. Gr. of 2.0). This limit does not apply to coarse aggregate
manufactured from blast-furnace slag unless contamination is evident.
d. Clay ironstone is defined as an impure variety of iron carbonate,
iron oxide, hydrous iron oxide, or combinations thereof, commonly mixed
SECTION 02753
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