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Fine aggregate and each size of coarse aggregate shall be stored in
separate size groups adjacent to the batch plant and in such a manner as to
prevent the intermingling of size groups or the inclusion of foreign
materials in the aggregate. Sufficient fine and coarse aggregate shall be
maintained at the site for at least [30] [_____] operating days of
continuous placement.
1.7.3
Chemical Admixtures
Any admixture that has been in storage at the project site for longer than
recommended by the manufacturer or that has been subjected to freezing
shall not be used in the work and shall be removed from the site.
PART 2
PRODUCTS
2.1
MATERIALS
2.1.1
Cementitious Materials
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NOTE: See the appropriate concrete aggregates DM or
thermal study to select the proper requirements for
cementitious materials options.
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2.1.1.1
Portland Cement
Portland cement shall conform to ASTM C 150, Type [_____], [low alkali when
it is to be used with aggregates listed to require it in the paragraph
COMMERCIAL CONCRETE AGGREGATE SOURCES or when directed if a nonlisted
source is permitted.] [the heat of hydration requirement at 7 days shall
be no greater than [_____] calories per gram] [including false-set
requirement]. [In lieu of low-alkali cement, the Contractor may use a
combination of portland cement that does not meet the low-alkali
requirement with a suitable pozzolan or ground granulated blast-furnace
slag (GGBFS) provided the following requirement is met. The expansion of
the proposed combination shall be equal to or less than the expansion of a
low-alkali cement meeting the requirements of ASTM C 150 when tested in
conformance with ASTM C 441. These two tests shall be performed
concurrently at an independent certified laboratory at the Contractor's
expense. The Government reserves the right to confirm the test results and
to adjust the percentage of pozzolan or GGBFS in the combination to suit
other requirements at no additional cost to the Government.] Portland
cement shall be furnished in bulk.
2.1.1.2
Pozzolan
Pozzolan shall conform to ASTM C 618, Class [_____], and, in addition,
limits in Table 2A, Uniformity Requirements (for air content) shall apply
to all fly ash. [Table 1A, Supplementary Optional Chemical Requirement for
Maximum Alkalies, shall apply when it is to be used with aggregates listed
to require low-alkali cement]. Pozzolan shall be furnished in bulk.
2.1.1.3
Temperature of Cementitious Materials
The temperature of the cementitious materials as delivered to the site
shall not exceed 65 degrees C 150 degrees F.
SECTION 03701
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