03 39 00 Concrete Curing.pdf
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- Attached to
- 2027 Sewer System Improvements Project
- Solicitation number
- Not on record
- Issued by
- Dauphin County, Harveys Lake Borough, Pennsylvania
About this file
This is a technical specification document for concrete curing procedures applicable to the 2027 Sewer System Improvements Project being procured by Capital Region Water (CRW) in Harrisburg, Pennsylvania. The specification establishes requirements for initial and final curing of both horizontal and vertical concrete surfaces in compliance with industry standards including ACI 301, ACI 302, ACI 308, ASTM C171, and ASTM C309. The document mandates that contractors perform all work in accordance with these referenced standards and submit product data on curing compounds prior to application. Concrete surfaces must be cured for a minimum of seven days using one of three approved methods: moist curing through continuous water coverage or saturation of absorptive covers; moist cover curing using moisture-retaining covers with specified lap and sealing requirements; or liquid membrane curing compounds applied via power-spray or roller within two hours of finishing operations. Horizontal surfaces must utilize Method 2 (moist cover curing) unless written approval from the engineer permits otherwise, while vertical surfaces must use Method 1 (moist curing) unless similarly approved in writing.
The specification requires use of clear, waterborne, membrane-forming curing compounds meeting ASTM C309 Type 1 Class B standards, absorptive covers compliant with AASHTO M182 Class 3, and moisture-retaining covers meeting ASTM C171 requirements. Contractors must deliver all curing materials in manufacturer's original packaging with application instructions and handle materials in accordance with manufacturer specifications. The document prohibits the use of membrane curing compounds on concrete surfaces scheduled to receive coatings, waterproofing, damp-proofing, flooring, or other finish materials directly applied to concrete. Finished work must be protected from traffic and maintained under the project's temporary facilities provisions. No budget, pricing terms, set-asides, incumbent vendor information, or performance bond requirements are specified within this technical specification document.
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Text version
03 39 00 – Concrete Curing
1.0 General
1.1 Section Includes
A. Initial and final curing of horizontal and vertical concrete surfaces.
1.2 References
A. ACI 301 – Structural Concrete for Buildings.
B. ACI 302 – Recommended Practice for Concrete Floor and Slab Construction.
C. ACI 308 – Standard Practice for Curing Concrete.
D. ASTM C171 – Sheet Materials for Curing Concrete.
E. ASTM C309 – Liquid Membrane Forming Compounds for Curing Concrete.
1.3 Submittals
A. Product Data: The Contractor shall provide data on curing compounds, product characteristics, compatibility and limitations.
1.4 Quality Assurance
A. The Contractor shall perform Work in accordance with ACI 301.
1.5 Delivery, Storage, and Handling
A. The Contractor shall deliver, store, protect and handle products in accordance with manufacturer's instructions.
B. The Contractor shall deliver curing materials in manufacturer's packaging including application instructions.
2.0 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.
3.0 Execution
3.1 Examination
A. The Contractor shall verify that substrate surfaces are ready to be cured.
3.2 General Procedures
A. The Contractor shall 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. The Contractor shall begin curing after finishing concrete but not before free water has disappeared from concrete surface.
3.3 Curing Methods
A. The Contractor shall cure formed and unformed concrete for at least seven (7) days by one or a combination of the following methods:
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 three (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. The Contractor shall cure surfaces in accordance with ACI 308.
B. The Contractor shall use Method 2 described in Paragraph 3.03, unless otherwise approved in writing by Engineer.
3.5 Curing Vertical Surfaces
A. The Contractor shall cure surfaces in accordance with ACI 308.
B. The Contractor shall use Method 1 described in Paragraph 3.03, unless otherwise approved in writing by Engineer.
3.6 Protection of Finished Work
A. The Contractor shall protect finished Work under provisions of Section 01 50 00 –
Temporary Facilities and Controls.
B. The Contractor shall not permit traffic over unprotected surfaces.
END OF SECTION
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