needed.
g. Material Finer than the 75-m (No. 200) Sieve - When in the opinion
of the Contracting Officer, a problem exists in connection with the
cleanliness of aggregate, tests shall be made in accordance with ASTM C
117. Testing frequency shall be as directed.
h. Corrective Action for Material Finer than the 75-m (No. 200) Sieve
- When material finer than the 75-m (No. 200) sieve exceeds 1.0
percent of the weight of the aggregate finer than 37.5 mm 1-1/2 inches
or 0.5 percent of the weight of the aggregate coarser than 37.5 mm
1-1/2 inches, the Contracting Officer shall be notified and steps, such
as washing or other corrective action, shall be initiated immediately.
3.8.2.3
Quality of Aggregates
**************************************************************************
NOTES: Tests should be those listed in paragraph
MATERIAL SPECIFICATION.
The petrographic examination shall be used to
identify deleterious substances in aggregates.
Deleterious substances shall be listed individually
with respective limits.
**************************************************************************
a. Frequency of Quality Tests - Prior to submitting samples for
mixture proportioning studies and 30 days prior to the start of
concrete placement, 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 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
TEST
[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]
[Durability
Factor using
COE CRD-C 144
(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
Every 3 months
Every 3 months
ASTM C 117]
[Organic
Every 3 months
Not applicable
ASTM C 40]
SECTION 03700
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