PROPERTY
FINE AGGREGATE
COARSE AGGREGATE
TEST
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 preplaced-aggregate concreting operations, 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
preplaced-aggregate concreting operations. After preplaced-aggregate
concreting operations 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.
3.6.2.4
Scales
a. Accuracy in Determination of Mass - The accuracy of the scales
shall be checked by reference masses prior to start of grouting
operations and at least once every 3 months for conformance with the
applicable requirements of paragraph BATCHING EQUIPMENT. Such tests
shall also be made as directed whenever there are variations in
properties of the fresh grout that could result from batching errors.
b. Scales Corrective Action - When the accuracy of determination of
mass does not comply with specification requirements, grouting shall
not be performed until necessary adjustments or repairs have been made.
Discrepancies in recording accuracies shall be corrected immediately
to the Contracting Officer.
3.6.2.5
Grout Plant Control
The measurement of all constituent materials including cementitious
materials, aggregate, water, and admixtures shall be continuously
controlled. The fine aggregate mass and amount of added water shall be
adjusted as necessary to compensate for free moisture in the fine
aggregate. The amount of air-entraining agent shall be adjusted to control
air content within specified limits. A report shall be prepared indicating
type and source of cement used, type and source of pozzolan used, amount
and source of admixtures used, aggregate source, the required aggregate and
water in mass per cubic meter, amount of water as free moisture in the fine
aggregate, and the batch aggregate and mass of water per cubic meter for
each mixture batched during grouting operations.
3.6.2.6
Grout Mixture
a. Air-Content Testing - Air-content tests shall be made when test
specimens are fabricated. In addition, at least two tests for air
content shall be made on randomly selected batches of each separate
grout mixture produced during each 8-hour period of grout production.
Additional tests shall be made when excessive variation in consistency
is reported by the placing foreman or Government quality assurance
representative. Tests shall be made in accordance with ASTM C 231.
Test results shall be plotted on control charts which shall at all
times be readily available to the Government. Copies of the current
SECTION 03372
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