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
PROPERTY
FINE AGGREGATE
COARSE AGGREGATE
TESTS
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
Clay Lumps and
Every 3 months
Every 3 months
ASTM C 142
Friable Particles
Material Finer
Every 3 months
Every 3 months
ASTM C 117
than 75-m
(No. 200) Sieve
Organic Impurities
Every 3 months
Not applicable
ASTM C 40
ASTM C 87
L.A. Abrasion
Not applicable
Every 6 months
ASTM C 131
ASTM C 535
Soft Particles
Not applicable
Every 6 months
COE CRD-C 130
Petrographic
Every 6 months
Every 6 months
ASTM C 295
Examination
Coal and Lignite,
Every 6 months
Every 6 months
ASTM C 123
less than 2.00
specific gravity
b. Corrective Action for Aggregate Quality - If the result of a
quality test fails to meet the requirements for quality immediately
prior to start of concrete placement, production procedures or
materials shall be changed and additional tests shall be performed
until the material meets the quality requirements prior to proceeding
with either mixture proportioning studies or starting concrete
placement. After concrete placement commences, whenever the result of
a test for quality fails the requirements, the test shall be rerun
immediately. If the second test fails the quality requirement, the
fact shall be reported to the Contracting Officer, and immediate steps
shall be taken to rectify the situation.
3.4.2.4
Deleterious Substances
a. Testing - When, in the opinion of the Contracting Officer, a
problem exists in connection with deleterious substances in fine or
coarse aggregates, tests shall be made in accordance with ASTM C 33 at
a frequency as directed, but not less than once per week. Results of
tests shall be reported in writing.
SECTION 03373
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