3.4
TESTS AND INSPECTIONS
3.4.1
General
The Contractor shall perform the inspection and tests described in the
following paragraphs and, based upon the results of these inspections and
tests, shall take the action required and submit reports as required.
When, in the opinion of the Contracting Officer, the concreting operation
is out of control, concrete placement shall cease. The laboratory
performing the tests shall be onsite and shall conform with ASTM C 1077.
The individuals who sample and test concrete or the constituents of
concrete as required in this specification shall have demonstrated a
knowledge and ability to perform the necessary test procedures equivalent
to the ACI minimum guidelines for certification of Concrete Field Testing
Technicians, Grade I. The individuals who perform the inspection of
concrete construction shall have demonstrated a knowledge and ability
equivalent to the ACI minimum guidelines for certification of Concrete
Construction Inspector, Level II. The Government will inspect the
laboratory, equipment, and test procedures prior to start of concreting
operations and at least once per year thereafter for conformance with ASTM
C 1077.
3.4.2
Testing and Inspection Requirements
The Contractor shall submit documentation asserting that the concrete
testing technicians and the concrete inspectors meet the specified
requirements.
3.4.2.1
Fine Aggregate
a. Grading - At least once during each shift when the concrete plant
is operating, there shall be one sieve analysis and fineness modulus
determination in accordance with ASTM C 136 and COE CRD-C 104 for the
fine aggregate or for each size range of fine aggregate if it is
batched in more than one size or classification. The location at which
samples are taken may be selected by the Contractor as the most
advantageous for control. However, the Contractor is responsible for
delivering fine aggregate to the mixer within specification limits.
b. Corrective Action for Fine Aggregate Grading - When the amount
passing on any sieve is outside the specification limits, the fine
aggregate shall be immediately resampled and retested. If there is
another failure on any sieve, the fact shall immediately be reported to
the Contracting Officer.
c. Moisture Content Testing - When, in the opinion of the Contracting
Officer, the electric moisture meter is not operating satisfactorily,
there shall be at least four tests for moisture content in accordance
with ASTM C 566 during each 8-hour period of mixing plant operation.
The times for the tests shall be selected randomly within the 8-hour
period. An additional test shall be made whenever the slump is out of
control or excessive variation in workability is reported by the
placing foreman. When the electric moisture meter is operating
satisfactorily, at least two direct measurements of moisture content
shall be made per week to check the calibration of the meter. The
results of tests for moisture content shall be used to adjust the added
water in the control of the batch plant.
d.
Moisture Content Corrective Action - Whenever the moisture content
SECTION 03373
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