the following materials: ASTM C 618 pozzolan or fly ash, or ASTM C 989
ground granulated blast-furnace slag. Use one manufacturer for each type
of cement, ground slag, fly ash, and pozzolan.
2.2.1.1
Fly Ash and Pozzolan
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NOTE: Fly ash, pozzolan, and slag cement may
produce uneven discoloration of the concrete during
the early stages of construction, depending upon the
type of curing provided. Fly ash or pozzolan
meeting the specified test results, which are more
stringent than ASTM C 618, should provide acceptable
end results. Type F fly ash and slag are
replacements for some sand and aggregates also
adding to durability.
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ASTM C 618, Type N, F, or C, except that the maximum allowable loss on
ignition shall be 6 percent for Types N and F. Add with cement.
2.2.1.2
Ground Iron Blast-Furnace Slag
ASTM C 989, Grade 120.
2.2.1.3
Silica Fume
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NOTE: Use silica fume concrete for marine
structures where low permeability and enhanced
durability are necessary. The silica fume and high
range water reducing admixture should be from the
same manufacturer. Select weight percentage based
on performance required.
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NOTE: Use for high durability and low permeability.
The initial cost of the concrete will increase, and
supervision at the batch plant, finishing, and
curing is necessary. A HRWR shall be used with
silica fume. The slump can be increased 50 to 125 mm
2 to 5 inches without reducing strength. Finishing
may be more difficult. Proper curing is essential
because there is a tendency for plastic shrinkage
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ASTM C 1240.
2.2.2
Water
Water shall comply with the requirements of ASTM C 94 and the chloride and
sulfate limits in accordance with ASTM D 512 and ASTM D 516. Mixing water
shall not contain more than 500 parts per million of chlorides as Cl and
free from injurious amounts of oils, acids, alkalies, salts, and organic
materials. Where water from reprocessed concrete is proposed for use in
the work, submit results of tests to verify that the treatment has negated
SECTION 03311
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