the scale setting for the coarse aggregate batcher and the water
batcher shall be adjusted if necessary to maintain the specified slump.
3.7.2.3
Quality of Aggregates
**************************************************************************
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.
Depending upon the quality pf aggregates available,
some tests may not be required. Refer to EM
1110-2-2000 for the purpose of each test.
**************************************************************************
a. Frequency of Quality Tests - Thirty days prior to the start of
concrete placement the Contractor shall perform all tests for aggregate
quality listed below. In addition, after the start of concrete
placement, the Contractor shall perform tests for aggregate quality in
accordance with the frequency schedule shown below. Samples tested
after the start of concrete placement shall be taken immediately prior
to entering the concrete mixer.
FREQUENCY
FINE
COARSE
PROPERTY
AGGREGATE
AGGREGATE
TEST
Specific Gravity
Every 3 months
Every 3 months
ASTM C 127
ASTM C 128
Absorption
Every 3 months
Every 3 months
ASTM C 127
ASTM C 128
[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]
Every 3 months
Not applicable
ASTM C 40
ASTM C 87
[A.L. Abrasion
Not applicable
Every 6 months
ASTM C 131
ASTM C 535]
[Soft and
Friable (Scratch
Not applicable
Every 6 months
COE CRD-C 130]
SECTION 03301A
Page 47
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