03 39 00 - Concrete Curing.pdf
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- Lancaster County, Pennsylvania
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This is a technical specification document for concrete curing procedures prepared by Herbert, Rowland & Grubic, Inc. for the Borough of Elizabethtown's sanitary sewer improvements project in Pennsylvania. The specification outlines requirements for initial and final curing of horizontal and vertical concrete surfaces associated with cast-in-place concrete work, including structural building frames and slabs. The document references industry standards from the American Concrete Institute (ACI) and ASTM International, requiring manufacturers to have a minimum of three years' documented experience. The specification mandates curing periods of at least seven days using one or more of three primary methods: moist curing through continuous water application or saturated absorptive covers with 12-inch lap coverage; moist cover curing using moisture-retaining polyethylene film or white burlap-polyethylene sheets with 12-inch side and end laps sealed with waterproof tape; or liquid membrane curing compounds applied within two hours of final finishing operations. Horizontal surfaces must be cured using the moist cover method unless otherwise approved by the Engineer, while vertical surfaces require the moist curing method unless Engineer approval is obtained.
The specification establishes material requirements for waterborne, membrane-forming curing compounds meeting ASTM C309 Type 1 Class B standards, absorptive covers complying with AASHTO M182 Class 3 specifications, and moisture-retaining covers conforming to ASTM C171. All materials must be delivered in manufacturer's original packaging and stored in clean, dry locations protected from moisture and dust. The document prohibits the use of membrane curing compounds on surfaces intended for subsequent coating applications, waterproofing, damp-proofing, flooring, painting, or other finish materials. Curing operations must commence after finishing is complete but before free water disappears from the concrete surface, with special protection protocols required for cold-weather and hot-weather conditions per ACI standards. No pricing information, bid amounts, set-asides, or contract duration terms are specified in this technical section.
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Text version
03 39 00 - CONCRETE CURING
Herbert, Rowland & Grubic, Inc. 03 39 00 - 1 000598.0465
SECTION 03 39 00 - CONCRETE CURING
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes: Initial and final curing of horizontal and vertical concrete surfaces.
B. Related Requirements:
1. Section 03 30 00 - Cast-in-Place Concrete: Cast-in-place or in-situ concrete for structural building frames, slabs on fill or grade, and other concrete components associated with construction.
1.2 REFERENCE STANDARDS
A. American Concrete Institute:
1. ACI 301 - Specifications for Structural Concrete.
2. ACI 302.1 - Guide to Concrete Floor and Slab Construction.
3. ACI 308.1 - Specification for Curing Concrete.
4. ACI 318 - Building Code Requirements for Structural Concrete and Commentary.
B. ASTM International:
1. ASTM C171 - Standard Specification for Sheet Materials for Curing Concrete.
2. ASTM C309 - Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete.
3. ASTM C1315 - Standard Specification for Liquid Membrane-Forming Compounds
Having Special Properties for Curing and Sealing Concrete.
4. ASTM D2103 - Standard Specification for Polyethylene Film and Sheeting.
1.3 SUBMITTALS
A. Section 01 33 00 - Submittal Procedures: Requirements for submittals.
B. Product Data: Submit manufacturer's information on curing compounds, mats, paper, and film, including compatibilities and limitations.
C. Manufacturer's Certificate: Certify that products meet or exceed specified requirements.
1.4 QUALITY ASSURANCE
A. Perform Work according to ACI 301.
1.5 QUALIFICATIONS
A. Manufacturer: Company specializing in manufacturing products specified in this Section with minimum three years' documented experience.
Herbert, Rowland & Grubic, Inc. 03 39 00 - 2 000598.0465
1.6 DELIVERY, STORAGE, AND HANDLING
A. Section 01 61 00 - Product Requirements: Requirements for transporting, handling, storing, and protecting products.
B. Inspection: Accept materials on Site in manufacturer's original packaging and inspect for damage.
C. Store materials according to manufacturer instructions.
D. Protection:
1. Protect materials from moisture and dust by storing in clean, dry location remote from construction operations areas.
2. Provide additional protection according to manufacturer instructions.
PART 2 - PRODUCTS
2.1 MATERIALS
A. Clear, Waterborne, Membrane-Forming Curing Compound: ASTM C309, Type 1, Class B.
B. Absorptive Cover: AASHTO M182, Class 3, burlap cloth or cotton mats.
C. Moisture-Retaining Cover: ASTM C171, polyethylene film or white burlap-polyethylene sheet.
D. Water: Potable and not detrimental to concrete.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Section 01 73 00 - Execution Requirements: Requirements for application examination.
B. Verify that substrate surfaces are ready to be cured.
3.2 GENERAL PROCEDURES
A. Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with ACI 306.1 for cold-weather protection and with ACI 301 for hot-weather protection during curing.
B. Begin curing after finishing concrete but not before free water has disappeared from concrete surface.
3.3 CURING METHODS
A. Cure formed and unformed concrete for at least seven (7) days by one or a combination of the following methods:
Herbert, Rowland & Grubic, Inc. 03 39 00 - 3 000598.0465
1. Method 1 – Moist Curing:
a. Keep concrete surface continuously wet by covering with water, or
b. Continuous water-fog spray, or
c. 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 12-inch lap over adjacent absorptive covers.
2. Method 2 – Moist Cover Curing:
a. Cover concrete surfaces with moisture-retaining cover for curing concrete, placed in widest practicable width with sides and ends lapped at least 12-inches and sealed by waterproof tape or adhesive.
Immediately repair any holes or tears during curing period using cover material and waterproof tape.
3. Method 3 – Liquid Membrane Curing Compound:
a. Apply specified curing and sealing compound to concrete within two hours of completion of final finishing operations.
b. Apply uniformly in continuous operation by power-spray or roller in accordance with manufacturer's instructions. Recoat areas subjected to heavy rainfall within 3 hours after initial application. Maintain continuity of coating and repair damage during curing period.
c. Do not use membrane curing compounds on surfaces which are to be covered with coating material applied directly to concrete, liquid floor hardener, waterproofing, damp-proofing, membrane roofing, flooring, painting, and other coatings and finish materials.
3.4 CURING HORIZONTAL SURFACES
A. Cure surfaces in accordance with ACI 308.
B. Use Method 2 described in Paragraph 3.03, unless otherwise approved by Engineer.
3.5 CURING VERTICAL SURFACES
A. Cure surfaces in accordance with ACI 308.
B. Use Method 1 described in Paragraph 3.03, unless otherwise approved by Engineer.
3.6 PROTECTION OF FINISHED WORK
A. Protect finished Work under provisions of Section 01 50 00 – Temporary Facilities and Controls.
B. Do not permit traffic over unprotected surfaces.
END OF SECTION
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