Corrective Action for Aggregate Quality

FREQUENCY

PROPERTY

FINE AGGREGATE

COARSE AGGREGATE

TESTS

[Petrographic

Examination

(including percent

with fractured face)

Every 6 months

[_____]]

[Chert, less than

2.40 specific

gravity

Every 6 months

ASTM C 123]

[Coal and Lignite,

less than 2.00

specific gravity

Every 6 months

ASTM C 123]

or ASTM C 295

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 to the Contracting Officer and immediate steps

taken to rectify the situation.

3.10.2.4

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 paragraphs BATCH PLANT and CONTINUOUS MIXING PLANT.

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 BATCH PLANT for checking the

accuracy of dispensed admixtures are operating properly. If a

continuous mixing plant is provided, the accuracy and operation of all

feeding and dispensing units shall be checked before the start of

operation each day.

c. Scales Corrective Action - When 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.

3.10.2.5

Concrete Plant Control

The measurement of all constituent materials including cementitious

SECTION 03701

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