the Vebe time when it varies outside the range considered ideal for
compaction, as determined by the Government using the modified Vebe
apparatus, in accordance with COE CRD-C 53.
PART 3
EXECUTION
3.1
EQUIPMENT
3.1.1
Capacity
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NOTE: See the concrete materials DM or EM
1110-2-2000 for the plant size requirements.
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The concrete plant, conveying, placing, compaction, and cleanup systems
shall have a capacity of at least [_____] cubic meters yards per hour.
3.1.2
Concrete Plant
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NOTE: See EM 1110-2-2000 and the concrete materials
DM for selection of automatic or semiautomatic plant
and for use of the rescreening and washing plant.
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The concrete plant shall be a batch or a continuous mixing plant.
3.1.2.1
Location
The concrete plant shall be located at the site of the work in the general
area indicated in the drawings[, or shall be located offsite].
3.1.2.2
Bins and Silos
Separate bins, compartments, or silos shall be provided for each size or
classification of aggregate and for each of the cementitious materials.
The compartments shall be of ample size and so constructed that the various
materials will be maintained separately under all working conditions. All
compartments containing bulk cement or pozzolan shall be separated from
each other by a free-draining air space. The cement and pozzolan bins
shall be equipped with filters which allow air passage but preclude the
venting of cement or pozzolan into the atmosphere. All filling ports shall
be clearly marked with a permanent sign stating the contents.
3.1.2.3
Batch Plant
The batch plant requirements should meet the following requirements.
a. Batchers - Aggregate shall be weighed in separate weigh batchers
with individual scales [or may be batched cumulatively]. Bulk cement
and other cementitious materials shall each be weighed on a separate
scale in a separate weigh batcher. Water shall be measured by weight
or by volume. It shall not be weighed or measured cumulatively with
another ingredient. Ice shall be measured separately by weight.
Admixtures shall be batched separately and shall be batched by weight
or by volume in accordance with the manufacturers recommendations.
b.
Water Batcher - A suitable water-measuring and batching device
SECTION 03701
Page 31
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