Complete Compiled Specification.pdf - Peck Ormsby Construction

temperatures. In hot, dry, and windy weather, protect concrete from rapid moisture loss
before and during finishing operations with an evaporation-control material. Apply in
accordance with manufacturer's instructions after screeding and bull floating, but before
power floating and troweling.
1. Start initial curing as soon as free water has disappeared from concrete surface after
placing and finishing. Weather permitting; keep continuously moist for not less than
seven (7) days.
B. Curing Methods: Perform curing of concrete by moist curing, by moisture-retaining cover
curing, or by curing and sealing compound, and by combinations thereof, as herein specified.
C. Provide moisture curing by the following methods:
1. Keep concrete surface continuously wet by covering with water.
2. Continuous water-fog spray.
3. Covering concrete surface with specified absorptive cover, thoroughly saturating
cover with water and keeping continuously wet. Place absorptive cover to provide
coverage of concrete surfaces and edges, with 4" lap over adjacent absorptive
covers.
D. Provide moisture-cover curing as follows:
1. Cover concrete surfaces with moisture-retaining cover for curing concrete, placed in
widest practicable width with sides and ends lapped at least 3" and sealed by
waterproof tape or adhesive. Immediately repair any holes or tears during curing
period, using cover material and waterproof tape.
E. Provide curing and sealing compound to slabs as follows: Coordinate with installation of joint
sealers in toppings and slabs.
1. Apply specified curing and sealing compound to concrete slabs as soon as final
finishing operations are complete (within 2 hours after surface water sheen has
disappeared). Apply uniformly in continuous operation by power-spray or roller in
accordance with manufacturer's directions. Recoat areas subjected to heavy rainfall
within three (3) hours after initial application. Maintain continuity of coating and repair
damage during curing period.
2. Use membrane curing compounds that will not affect surfaces to be covered with
finish materials applied directly to concrete.
3. Interior floor slabs with sealer finish are to be cured and sealed only with liquid
membrane forming curing/sealing compound specified. Apply floor sealer in two (2)
coats at application rates recommended by manufacturer as follows:
a. Application requirements: The first application at 200 square feet per gallon
as the curing agent at time of concrete placement.
b. After application of joint sealant, Contractor shall power scrub floor clean
before application of second coat. Apply at a rate of 400 square feet per
gallon
4. All work must be performed by a factory approved applicator.
5. Warranty:
a. Upon completion of the work, as a condition of its acceptance, furnish the
owner a written warranty signed by an officer of the manufacturer.
F. Curing Formed Surfaces: Cure formed concrete surfaces, including undersides of beams,
supported slabs, and other similar surfaces by moisture curing, with forms in place for full
curing period or until forms are removed. If forms are removed, continue curing by methods
specified above, as applicable.
G. Curing Unformed Surfaces: Cure unformed surfaces, such as slabs, floor topping, and other
SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION MARCH 2, 2009
CONCRETE WORK 03300 - 11