65-Sec 03 11 00 - CONCRETE FORMWORK.pdf
PDF 68 KB Posted
- Attached to
- 2201256.01 - Whistlestop Park
- Solicitation number
- US.160528
- Issued by
- Montgomery County, Pennsylvania
About this file
This is a technical specification document for concrete formwork work prepared for Montgomery Township, Pennsylvania in connection with the Whistlestop Park rehabilitation project. The specification details requirements for formwork design, materials, and installation for cast-in-place concrete elements including sidewalks, curb ramps, driveway aprons, and curbs. The work must conform to ACI 301, ACI 318, and ACI 347 standards, with forms constructed from wood or steel profiled to suit site conditions. Key execution requirements include verification of lines, levels, and dimensions prior to formwork erection; removal and replacement of unsuitable subgrade material with compacted PADOT 2A stone; prohibition of earth forms; proper bracing and assembly to permit safe dismantling; application of colorless mineral oil form release agent; and careful form cleaning prior to concrete placement. Formwork tolerances must comply with ACI 301 standards, and forms may not be removed until concrete has gained sufficient strength to carry its own weight and imposed loads.
The specification establishes product standards requiring forms to be straight, free from warp, and of sufficient strength to resist concrete pressure without springing, with worn, bent, warped, or broken forms prohibited from use. Form release agents must be colorless mineral oil that will not stain concrete, absorb moisture, or impair natural bonding or coating characteristics. During cold weather conditions, ice and snow must be removed from forms without using de-icing salts or water unless work proceeds within a heated enclosure. The specification references related sections addressing concrete reinforcement and Portland cement concrete paving, and requires field inspection and quality control in accordance with Section 01 40 00 to ensure formwork construction meets design specifications and maintains structural integrity.
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Text version
CONCRETE FORMWORK
03 11 00-1
SECTION 03 11 00
PART 1 GENERAL
1.01 SECTION INCLUDES
A. Formwork for cast-in-place concrete for sidewalks, curb ramps, driveway aprons, and curbs.
B. Form stripping.
1.02 RELATED SECTIONS
A. Related Work Specified Elsewhere.
1. Section 03 20 00: Concrete Reinforcement
2. Section 32 13 13: Portland Cement Concrete Paving
1.03 REFERENCES
A. ACI 301 - Structural Concrete for Buildings.
B. ACI 318 - Building Code Requirements for Reinforced Concrete.
C. ACI 347 - Recommended Practice for Concrete Formwork.
1.04 DESIGN REQUIREMENTS
A. Design and construct formwork, to conform to code requirements; resultant concrete to conform to required shape, line and dimension.
1.05 QUALITY ASSURANCE
A. Perform Work in accordance with ACI 347, 301, and 318.
PART 2 PRODUCTS
2.01 FORM MATERIALS
A. Forms shall be straight, free from warp and of sufficient strength to resist the pressure of concrete without springing. Forms and template which are worn, bent, warped or broken shall not be used.
1. For sidewalks and driveway aprons, use forms of wood or steel profiled to suit conditions.
2.02 FORMWORK ACCESSORIES
A. Form Release Agent: Colorless mineral oil which will not stain concrete, or absorb moisture, or impair natural bonding or color characteristics of coating intended for use on concrete.
PART 3 EXECUTION
3.01 EXAMINATION
A. Verify lines, levels and centers before proceeding with formwork. Ensure that dimensions agree with drawings.
1. Soft, loose, wet or otherwise unsuitable material shall be removed from the subgrade and replaced with PADOT 2A Stone compacted to 95% ASTM D698.
2. Replace subbase stone as required.
3.02 EARTH FORMS
03 11 00-2
A. Earth forms are not permitted.
3.03 ERECTION - FORMWORK
A. Erect formwork to achieve design requirements, in accordance with requirements of ACI 301.
B. Provide bracing to ensure stability of formwork. Shore or strengthen formwork subject to over stressing by construction loads.
C. Arrange and assemble formwork to permit dismantling and stripping. Do not damage concrete during stripping. Permit removal of remaining principal shores.
D. Place pre-molded expansion joint filler in all joints between sidewalk slabs, between sidewalk and driveway apron, and between driveway apron and 6” concrete curb backer.
3.04 APPLICATION - FORM RELEASE AGENT
A. Apply form release agent on formwork in accordance with manufacturer’s recommendations.
B. Apply prior to placement of reinforcing steel, anchoring devices, and embedded items.
C. Soak inside surfaces of untreated forms with clean water. Keep surfaces coated prior to placement of concrete.
3.05 FORM CLEANING
A. Clean forms as erection proceeds, to remove foreign matter within forms.
B. Clean formed cavities of debris prior to placing concrete.
C. Flush with water or use compressed air to remove remaining foreign matter. Ensure that water and debris drain to exterior through clean-out ports.
D. During cold weather, remove ice and snow from within forms. Do not use de-icing salts. Do not use water to clean out forms, unless formwork and concrete construction proceed within heated enclosure. Use compressed air or other means to remove foreign matter.
3.06 FORMWORK TOLERANCES
A. Construct formwork to maintain tolerances required by ACI 301.
3.07 FIELD QUALITY CONTROL
A. Section 01 40 00 - Quality Control: Field inspection and testing.
B. Inspect erected formwork to ensure that work is in accordance with formwork design.
3.08 FORM REMOVAL
A. Do not remove forms or bracing until concrete has gained sufficient strength to carry its own weight and imposed loads.
B. Loosen forms carefully. Do not wedge pry bars, hammers, or tools against finish concrete surfaces scheduled for exposure to view.
C. Store removed forms in manner that surfaces to be in contact with fresh concrete will not be damaged. Discard damaged forms.
END OF SECTION
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