low-alkali cement, the Contractor may use a combination of portland cement
that does not meet the low-alkali requirement with a pozzolan or GGBFS
provided the following requirement is met. The expansion of the proposed
combination when tested in accordance with ASTM C 441 shall be equal to or
less than the expansion of a low-alkali cement meeting the requirements of
ASTM C 150 when tested in general conformance with ASTM C 441. The
expansion tests shall be run concurrently at an independent laboratory that
is nationally recognized to perform such tests. The Government reserves
the right to confirm the test results and to adjust the percentage of
pozzolan or slag in the combination to suit other requirements.]
2.1.1.2
Pozzolan, Other than Silica Fume
Pozzolan shall conform to ASTM C 618, Class [C], [F], with the optional
requirements for multiple factor, drying shrinkage, and uniformity of Table
2A. Table 1A requirement for maximum alkalies shall apply when used with
aggregates listed at the end of this section to require low-alkali cement.
2.1.2
Aggregates
2.1.2.1
General
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NOTE: The list of sources and required tests and
test limits will be taken from the concrete
materials DM.
**************************************************************************
Concrete aggregates may be furnished from any source capable of meeting the
quality requirements as stated in paragraph QUALITY. The sources listed at
the end of this section were evaluated during the design phase of the
project in [_____] and at that time were capable of meeting the quality
requirements when suitably processed. No guarantee is given or implied
that any of the listed sources are currently capable of producing
aggregates that meet the required quality stated in paragraph QUALITY. A
DM containing the results of the Government's investigation and test
results is available for review in the [_____] District Office. Contact
[_____] at [_____] to arrange for review of the memorandum. The test
results and conclusions shall be considered valid only for the sample
tested and shall not be taken as an indication of the quality of all
material from a source nor for the amount of processing required. Fine and
coarse aggregates shall conform to the grading requirements of ASTM C 33.
The nominal maximum size shall be as listed in paragraph NOMINAL
MAXIMUM-SIZE COARSE AGGREGATE.
2.1.2.2
Concrete Aggregate Sources
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NOTE: If an aggregate source is provided by the
Government, the appropriate paragraphs from
UFGS-03700 should be used.
**************************************************************************
a. List of Sources - The concrete aggregates sources may be selected
from sources listed at the end of this section.
b. Selection of Source - After the award of the contract, the
Contractor shall designate in writing only one source or combination of
sources from which he proposes to furnish aggregates. If the
SECTION 03373
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