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. [For concrete slabs or wide
beams containing silica fume, fog spray and install wind breaks to
ensure 100 percent relative humidity until wet curing is started.]
b.
Wet cure marine concrete using potable
water for a minimum of 7
days. Do not allow construction loads
to exceed the superimposed
load which the structural member, with
necessary supplemental
support, is capable of carrying safely
and without damage.
3.7.1
Moist Curing
Remove water without erosion or damage to the structure.
3.7.1.1
Ponding or Immersion
Continually immerse the concrete throughout the curing period. Water shall
not be 11 degrees C 20 degrees F less than the temperature of the
concrete. For temperatures between 4 and 10 degrees C 40 and 50 degrees F,
increase the curing period by 50 percent.
3.7.1.2
Fog Spraying or Sprinkling
Apply water uniformly and continuously throughout the curing period. For
temperatures between 4 and 10 degrees C 40 and 50 degrees F, increase the
curing period by 50 percent.
3.7.1.3
Pervious Sheeting
Completely cover surface and edges of the concrete with two thicknesses of
wet sheeting. Overlap sheeting 150 mm 6 inches over adjacent sheeting.
Sheeting shall be at least as long as the width of the surface to be cured.
During application, do not drag the sheeting over the finished concrete
nor over sheeting already placed. Wet sheeting thoroughly and keep
continuously wet throughout the curing period.
3.7.1.4
Impervious Sheeting
Wet the entire exposed surface of the concrete thoroughly with a fine spray
of water and cover with impervious sheeting throughout the curing period.
Lay sheeting directly on the concrete surface and overlap edges 300 mm 12
inches minimum. Provide sheeting not less than 450 mm 18 inches wider than
the concrete surface to be cured. Secure edges and transverse laps to form
closed joints. Repair torn or damaged sheeting or provide new sheeting.
Cover or wrap columns, walls, and other vertical structural elements from
the top down with impervious sheeting; overlap and continuously tape
sheeting joints; and introduce sufficient water to soak the entire surface
prior to completely enclosing.
3.7.2
Liquid Membrane-Forming Curing Compound
Seal or cover joint openings prior to application of curing compound.
Prevent curing compound from entering the joint. Apply in accordance with
the recommendations of the manufacturer immediately after any water sheen
which may develop after finishing has disappeared from the concrete
surface. Provide and maintain compound on the concrete surface throughout
the curing period. Do not use this method of curing where the use of
SECTION 03311
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