Furnish a mix design utilizing alkali-reactive
aggregates with a maximum water-cement ratio of
0.45."
"Additional Curing When Using Alkali-Reactive
Aggregates.
Furnish ASTM C 39 test results to verify the
anticipated rate of strength development for the
proposed concrete mix design. Submit an increased
curing period and minimum time to strip formwork
based upon the reduced rate of strength development."
Add to "Curing and Protection" when using silica
fume.
Prevent concrete with silica fume from drying by one
or more of the following:
1.
Misting surface of concrete with fog nozzle;
2.
Liquid membrane-forming compound;
3.
Pervious or impervious sheeting.
Increase curing time per manufacturer's
recommendations.
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ACI 301 unless otherwise specified. Begin curing immediately following
form removal. Avoid damage to concrete from vibration created by blasting,
pile driving, movement of equipment in the vicinity, disturbance of
formwork or protruding reinforcement, and any other activity resulting in
ground vibrations. Protect concrete from injurious action by sun, rain,
flowing water, frost, mechanical injury, tire marks, and oil stains. Do
not allow concrete to dry out from time of placement until the expiration
of the specified curing period. Do not use membrane-forming compound on
surfaces where appearance would be objectionable, on any surface to be
painted, where coverings are to be bonded to the concrete, or on concrete
to which other concrete is to be bonded. If forms are removed prior to the
expiration of the curing period, provide another curing procedure specified
herein for the remaining portion of the curing period. Provide moist
curing for those areas receiving liquid chemical sealer-hardener or epoxy
coating.
3.9.1
Moist Curing
Remove water without erosion or damage to the structure.
3.9.1.1
Ponding or Immersion
Continually immerse the concrete throughout the curing period. Water shall
not be more than 10 degrees C (20 degrees F) 20 degrees F less than the
temperature of the concrete. For temperatures between 4 and 10 degrees C
(40 and 50 degrees F) 40 and 50 degrees F, increase the curing period by 50
percent.
SECTION 03300N
Page 43
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