SECTION 03370

CONCRETE CURING

PART 1 GENERAL

SECTION INCLUDES

Initial and final curing of horizontal and vertical concrete surfaces.

RELATED SECTIONS

Section 03300 - Cast-In-Place Concrete.

Section 03346 - Concrete Floor Finishing.

REFERENCES

ACI 301 - Structural Concrete for Buildings.

ACI 302 - Recommended Practice for Concrete Floor and Slab Construction.

ACI 308 - Standard Practice for Curing Concrete.

ASTM C171 - Sheet Materials for Curing Concrete.

ASTM C309 - Liquid Membrane-Forming Compounds for Curing Concrete.

ASTM D2103 - Polyethylene Film and Sheeting.

SUBMITTALS

Submit under provisions of Section [01300] [________].

Product Data: Provide data on curing compounds, product characteristics, compatibility and limitations.

Manufacturer's Installation Instructions: Indicate criteria for preparation and application.

QUALITY ASSURANCE

Perform Work in accordance with ACI 301.

Maintain [one copy] [[____] copies] of document on site.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products under provisions of Section [01600] [________].

Deliver curing materials in manufacturer's packaging including application instructions.

PART 2 PRODUCTS

MATERIALS

Membrane Curing Compound [Type [A] [____]]: [ASTM C309 Type [1] [1-D] [2] Class [A] [B],] [Acrylic] [Chlorinated rubber] [styrere acrylate] [dissipating resin] type, [clear] [translucent] [[with] [without] fugitive dye]; [________] manufactured by [________________].

Absorptive Mats [Type [B] [____]]: [ASTM C171,] [cotton fabric] [burlap-polyethylene, minimum 8 oz/sq yd (270 grams/sq m) bonded to prevent separation during handling and placing] [________]; [________] manufactured by [________________].

Waterproof Paper [Type [C] [____]]: [ASTM C171,] treated to prevent separation during handling and placing, [standard] [white] color; [________] manufactured by [________________].

Polyethelene Film [Type [D] [____]]:	[ASTM C171,] [ASTM D2103,] [4] [6] [____] mil ([0.1] [0.15] [____] mm) thick, [clear] [white opaque color].

Water:	Potable and not detrimental to concrete.

PART 3 EXECUTION

EXAMINATION

Verify substrate conditions under provisions of Section [01039] [________].

Verify that substrate surfaces are ready to be cured.

EXECUTION - HORIZONTAL SURFACES

Cure floor surfaces in accordance with [ACI 308] [________].

Ponding:	Maintain 100 percent coverage of water over floor slab areas continuously for [4] [____] days.

****** [OR] ******

Spraying: Spray water over floor slab areas and maintain wet for [7] [____] days.

****** [OR] ******

Absorptive Mat: Spread [cotton fabric] [________________] over floor slab areas. Spray with water until mats are saturated, and maintain in saturated condition for [7] [____] days.

****** [OR] ******

Absorptive Mat: Saturate burlap-polyethylene mat and place burlap-side down over floor slab areas, lapping ends and sides; maintain in place for [7] [____] days.

****** [OR] ******

Membrane Curing Compound: Apply curing compound in accordance with manufacturer's instructions in [one coat] [2 coats] [with second coat at right angles to first].

Polyethylene Film: Spread polyethelene film over floor slab areas, lapping edges and sides and sealing with pressure sensitive tape [; cover with plywood]; maintain in place for [7] [____] days.

EXECUTION - VERTICAL SURFACES

Cure surfaces in accordance with [ACI 308] [________].

Spraying: Spray water over surfaces and maintain wet for [7] [____] days.

****** [OR] ******

Membrane Curing Compound: Apply curing compound in accordance with manufacturer's instructions in [one coat] [2 coats] [with second coat at right angles to first].

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500] [________].

Do not permit traffic over unprotected floor surface.

SCHEDULES

Storage Area #108: Absorptive mats, burlap-polyethylene type.

Retaining Walls: Membrane curing compound, acrylic type, clear color.

All Other Floor Areas: Membrane curing compound, acrylic type, translucent color.

END OF SECTION