[Preliminary mixture-proportioning studies or thermal studies which include
mixture proportions are available for review in the District Office.]
[Some mixtures, especially those containing higher amounts of pozzolans,
may have slow strength gain which may impact form design and form removal
time.]
2.2.3
Control
The proportions of all material entering into each concrete mixture will be
furnished to the Contractor. The proportions will be changed by the
Contracting Officer as necessary. Adjustments shall be made by the
Contractor to the batch weights of aggregates and water as necessary to
compensate for free moisture in the aggregates. The quantity of
air-entrainment admixture shall be adjusted by the Contractor to maintain
the specified air content.
2.2.4
Nominal Maximum-Size of Aggregate
The nominal maximum-size of coarse aggregate to be used in the various
parts of the work shall be in accordance with the following tabulation
except as directed. The NMSA may be changed for sections requiring a
special quality of concrete as directed.
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NOTE: The following table to be used with SI units.
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NOMINAL MAXIMUM-SIZE
FEATURES
AGGREGATE
Sections 190
mm or less in width or
slabs 100 mm
or less in thickness or any
section with
a clear distance between reinforcement
less than 55
mm ............................................ 19 mm
Sections over 190 mm or slabs at least
100 mm in thickness. However, this size shall
not be used in any section in which the clear
distance between reinforcement is less than
55 mm ...................................................... 40 mm
[Unreinforced sections over 300 mm in width
and reinforced sections over 450 mm in width
or slabs 255 mm or greater in thickness.
However, this size shall not be used in any section
in which the clear distance between reinforcing
bars is less than 115 mm ................................... 75 mm]
[Massive sections exceeding 1.8 m in width
and slabs 600 mm in thickness, in which
the clear distance between reinforcing bars
is at least 225 mm ........................................ 150 mm]
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NOTE: The following table to be used with IP units.
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SECTION 03700
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