3.10.2.3
Quality of Aggregates
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NOTES: Tests should be those listed in paragraph
QUALITY. The petrographic examination shall be used
to identify deleterious substances in aggregates.
Deleterious substances shall be listed individually
with respective limits.
Only a limited number of laboratories are now
running ASTM C 123 due to the toxic chemicals
required. Recommend that ASTM C 295 be specified.
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a. Frequency of Quality Tests - Prior to submitting samples for
mixture proportioning studies, the Contractor shall perform the tests
for aggregate quality in the following list. In addition, after the
start of concrete placement, the Contractor shall perform tests for
aggregate quality during concrete or aggregate production, in
accordance with the following frequency schedule. Samples tested after
the start of concrete placement shall be taken immediately prior to
entering the concrete mixer.
FREQUENCY
PROPERTY
FINE AGGREGATE
COARSE AGGREGATE
TESTS
Specific
ASTM C 127
Gravity
Every 3 months
Every 3 months
ASTM C 128
Absorption
Every 3 months
Every 3 months
ASTM C 127
ASTM C 128
Flat and Elongate
Not applicable
Every 3 months
ASTM D 4791
[Durability
Factor using,
COE CRD-C 114
(Procedure A)
Every 12 months
Every 12 months ASTM C 666/C 666M]
[Clay Lumps and
Friable Particles Every 3 months
Every 3 months
ASTM C 142]
[Material Finer
than the 75 m
(No. 200) Sieve
Not applicable
Every 3 months
ASTM C 117]
[Organic
ASTM C 40
Every 3 months
Not applicable
ASTM C 87]
ASTM C 131
[L.A. Absorption
Not applicable
Every 6 months
ASTM C 535]
Liquid Limit and
Plasticity Limits
of -200 Sieve Size Every 3 months
Not applicable
[_____]
[Soft and Friable
(Scratch Hardness)
Not applicable
Every 6 months
COE CRD-C 130]
SECTION 03701
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