fugitive dye may be used on surfaces that will be exposed to view when the
project is completed. The reflective requirements of ASTM C 309 are
waived. [Surfaces cured with nonpigmented compound shall be shielded from
direct rays of the sun for 3 days.]
3.5.3.3
Application
The curing compound shall be applied to formed surfaces immediately after
the forms are removed. The surfaces shall be thoroughly moistened with
water, and the curing compound applied as soon as free water disappears.
The curing compound shall be applied to unformed surfaces as soon as free
water has disappeared provided steps have been taken when necessary to
prevent premature loss of free water due to excessive evaporation as
described in paragraph UNFORMED SURFACES. The curing compound shall be
applied in a two-coat continuous operation by motorized power-spraying
equipment or pressure-tank equipment operating at a minimum pressure of 520
kPa 75 psi with provisions for continuous agitation. The application
equipment shall be approved in advance. Hand-operated pressure applicators
("garden sprayers") shall not be used except in small, isolated areas as
approved. The compound shall be applied at a uniform coverage of not more
than 10 square meters per liter 400 square feet per gallon for each coat.
The second coat shall be applied perpendicular to the first coat. Concrete
surfaces that have been subjected to rainfall within 3 hours after the
curing compound has been applied shall be resprayed by the method and at
the coverage specified. All concrete surfaces on which the curing compound
has been applied shall be adequately protected for the duration of the
entire curing period from pedestrian and vehicular traffic and from any
other influence that will disrupt the continuity of the curing membrane.
3.5.4
[Sheet Curing
**************************************************************************
NOTE: The only concrete that may be cured using
sheet should be horizontal or nearly horizontal
finished surfaces such as roof slabs, uncolored
floors or the first course of two-course floors, or
floors that are to be covered with tile or resilient
flooring.
**************************************************************************
The following concrete surfaces may be cured using sheets: [_____];
[_____]; [_____]. Sheets shall be used only on horizontal or near
horizontal surfaces. The sheets shall comply with the requirements of ASTM
C 171, except that polyethylene sheet shall not be used. All surfaces
shall be thoroughly wetted and completely covered with waterproof paper, or
polyethylene-coated burlap. Covering shall be laid with light-colored side
up. Covering shall be lapped not less than 100 mm 4 inches and taped to
form a continuous cover with completely closed joints. The sheet shall be
weighted to prevent displacement so that it remains in contact with the
concrete during the specified length of curing. Coverings shall be folded
down over exposed edges of slabs and secured by approved means. Sheets
shall be immediately repaired or replaced if tears or holes appear during
the curing period.]
3.5.5
Sealed Insulation Curing
Between dates listed in paragraph COLD WEATHER PROTECTION where cold
weather protection is provided entirely by insulation, all joints in the
insulation shall be sealed to retard moisture loss and maintain a seal
SECTION 03700
Page 67
Previous Page
