2.1.2
Admixtures
All chemical admixtures furnished as liquids shall be in a solution of
suitable viscosity and dilution for field use as determined by the
Contracting Officer.
2.1.2.1
[Water-Reducing Admixture (WRA)
A WRA shall meet the requirements of ASTM C 494/C 494M, Type D, except that
the 6-month and 1-year compressive strength tests are waived. The
admixture may be added to the concrete mixture only when its use is
approved or directed and after mixture proportioning studies.]
2.1.2.2
Air-Entraining Admixture
Air-entraining admixture shall conform to ASTM C 260.
2.1.3
Water
Water for washing aggregates and for mixing and curing concrete shall be
free from injurious amounts of oil, acid, salt, alkali, organic matter, or
other deleterious substances and shall comply with COE CRD-C 400.
2.1.4
Aggregates
**************************************************************************
NOTE: See the concrete materials DM to select the
aggregate composition options.
**************************************************************************
2.1.4.1
Fine aggregate shall consist of natural sand, manufactured sand, or a
combination of natural and manufactured sands. Coarse aggregate shall
consist of [gravel], [crushed gravel], [crushed stone], [air-cooled
blast-furnace slag], or a combination thereof.
2.1.4.2
Quality
**************************************************************************
NOTE: The tests selected should be those which are
applicable to the concrete to be used in the
project. These tests may include those listed below
in addition to others not listed. See EM
1110-2-2000 for schedule of tests.
Only a limited number of laboratories are now
running ASTM C 123 due to the toxic chemicals
required. Recommend that ASTM C 295 be specified.
A list of properties and test values are unique to
each project and should be taken from the concrete
materials DM. Delete the quality tests not required
in the DM.
The petrographic examination shall be used to
identify deleterious substances in aggregates.
SECTION 03701
Page 24
Previous Page
