concrete placement shall cease. The laboratory performing the tests shall
be on-site 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
individual who performs the inspection shall have demonstrated a knowledge
and ability equivalent to the ACI minimum guidelines for certification of
[Concrete Transportation Construction Inspector (CTCI)] [Concrete
Construction Inspector (CCI)], 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.
3.10.2
Testing and Inspection Requirements
3.10.2.1
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, ASTM C 117, and COE CRD-C
104 for the fine aggregate or for each 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. The results
shall be recorded on a sheet on which are also shown the specification
limits applicable to the project.
b. Fineness-Modulus Control Chart - Results for fineness modulus shall
be grouped in sets of three consecutive tests, and the average and
range of each group shall be plotted on a control chart. The upper and
lower control limits for average shall be drawn 0.10 units above and
below the target fineness modulus, and the upper control limit for
range shall be 0.20.
c. 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. Whenever a point on the fineness modulus
control chart, either for average or range, is beyond one of the
control limits, the frequency of testing shall be doubled. If two
consecutive points are beyond the control limits, the process shall be
considered out of control and concreting shall be stopped. The
Contracting Officer shall be notified, and immediate steps shall be
taken to rectify the situation. After two consecutive points have
fallen within the control limits, testing at the normal frequency may
be resumed.
d. 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 an electric moisture meter is operating
satisfactorily, at least two direct measurements of moisture content
SECTION 03701
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