PROPERTY
FINE AGGREGATE
COARSE AGGREGATE
TEST
[L.A. 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]
[Petrographic
Examination
Every 6 months
Every 6 months
ASTM C 295]
[Chert, less
than 2.40
specific
gravity
Every 6 months
Every 6 months
ASTM C 123]
[Coal and
Lignite,
less than
2.00 specific
gravity
Every 6 months
Every 6 months
ASTM C 123]
b. Corrective Action for Aggregate Quality - If the result of a
quality test fails to meet the requirements for quality during
submittal of samples for mixture-proportioning studies or 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 and immediate steps taken to rectify the
situation.
3.8.2.4
Scales
a. Weighing Accuracy - The accuracy of the scales shall be
checked by
test weights at least once a month for conformance with the
applicable
requirements of paragraph EQUIPMENT. Such tests shall also
be made as
directed whenever there are variations in properties of the
fresh
concrete that could result from batching errors.
b. Batching and Recording Accuracy - Once a week the accuracy of each
batching and recording device shall be checked during a weighing
operation by noting and recording the required weight, recorded weight,
and the actual weight batched. The Contractor shall confirm that the
calibration devices described in paragraph EQUIPMENT for checking the
accuracy of dispensed admixtures, are operating properly.
c. Scales Corrective Action - When either the weighing accuracy or
batching accuracy does not comply with specification requirements, the
plant shall not be operated until necessary adjustments or repairs have
been made. Discrepancies in recording accuracies shall be corrected
immediately.
SECTION 03700
Page 74
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