Section 034500 - Precast Architectural Concrete

Section 034500 - Precast Architectural Concrete

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SECTION 034500 - PRECAST ARCHITECTURAL CONCRETE

TIPS:

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Revise this Section by deleting and inserting text to meet Project-specific requirements.

This Section uses the term "Architect."Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1RELATED DOCUMENTS

Retain or delete this article in all Sections of Project Manual.

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division01 Specification Sections, apply to this Section.

1.2SUMMARY

  1. Section Includes:
  2. Architectural precast concrete cladding[and load-bearing] units.
  3. Insulated, architectural precast concrete units.
  4. Thin-brick-faced, architectural precast concrete units.
  5. Stone-faced, architectural precast concrete units.
  6. Related Requirements:

Retain subparagraphs below to cross-reference requirements Contractor might expect to find in this Section but are specified in other Sections.

  1. Section033000 "Cast-in-Place Concrete" for installing connection anchors in concrete.
  2. Section034900 "Glass-Fiber-Reinforced Concrete (GFRC)."
  3. Section047200 "Cast Stone Masonry" for wet- or dry-cast stone facings, trim, and accessories.
  4. Section051200 "Structural Steel Framing" for furnishing and installing connections attached to structural-steel framing.
  5. Section055000 "Metal Fabrications" for kickers and other miscellaneous steel shapes.
  6. Section071900 "Water Repellents" for water-repellent finish treatments.
  7. Section085113 "Aluminum Windows" for windows set into architectural precast concrete units.

1.3ALLOWANCES

Retain products and Work included in this Section that are covered by cash or quantity allowance.Do not include amounts.Insert descriptions of items in Part2 or 3 to provide information affecting the cost of the Work that is not included under the allowance.

  1. Thin brick is part of <Insert name of allowance>.

Retain paragraph below if testing is paid for by Contractor under an allowance.

  1. [Preconstruction] [Source quality-control] [and] [field quality-control] testing are part of testing and inspecting allowance.

1.4DEFINITIONS

Retain terms that remain after this Section has been edited for a project.

Retain "Design Reference Sample" Paragraph below if a design reference sample has been preapproved by Architect.

  1. Design Reference Sample:Sample of approved architectural precast concrete color, finish and texture, preapproved by Architect.

1.5PREINSTALLATION MEETINGS

Retain "Preinstallation Conference" Paragraph below if Work of this Section is extensive or complex enough to justify a conference.

  1. Preinstallation Conference:Conduct conference at [Project site] <Insert location>.

If needed, insert list of conference participants not mentioned in Section013100 "Project Management and Coordination."

1.6ACTION SUBMITTALS

  1. Product Data:For each type of product.
  2. Sustainable DesignSubmittals:

Retain "Product Data" Subparagraph below to require minimum recycled content for LEED 2009 MRCredit2 - "Recycled Content."

  1. Product Data: For recycled content, indicating postconsumer and preconsumer recycled content and cost.

"Product Certificates" Subparagraph below applies to LEED 2009, Materials and Resources Credit5, "Regional Materials."

  1. Product Certificates: For regional materials, indicating location of material manufacturer and point of extraction, harvest, or recovery for each raw material. Include distance to Project and cost for each regional material.

"Product Certificates" Subparagraph below applies to LEEDv4, Materials and Resources Credit "Building Product Disclosure and Optimization - Environmental Product Declarations, Option2."

  1. Product Certificates: For materials manufactured within 100 miles (160 km) of Project, indicating location of material manufacturer and point of extraction, harvest, or recovery for each raw material. Include distance to Project and cost for each raw material.

"Product Certificates" Subparagraph below applies to IgCC, which requires that a minimum of 55 percent of building materials or products be extracted, harvested, manufactured, or recovered within 500 miles (800 km) of Project. See IgCC-2012, 505.2.5.

  1. Product Certificates: For indigenous materials, indicating location of material manufacturer and point of extraction, harvest, or recovery for each raw material. Include distance to Project, means of transportation, and cost for each indigenous material.

"Product Certificates" Subparagraph below applies to ASHRAE189.1, which requires that a minimum of 15 percent of building materials or products be extracted, harvested, manufactured, or recovered within 500 miles (800 km) of Project. See ASHRAE189.1-2014, 9.4.1.2.

  1. Product Certificates: For regional materials, indicating location of material manufacturer and point of extraction, harvest, or recovery for each raw material. Include distance to Project, means of transportation, and cost for each regional material.
  2. Environmental Assessment Report:Submit for concrete mixture. Compare submitted concrete mixture to conventional/typical reference concrete mixture that would otherwise be used to achieve the specified performance. At minimum, include information in the following environmental impact areas:air emissions (climate change, acidification, photochemical ozone formation, ozone depletion), water emissions (aquatic eutrophication), consumption of raw materials (resource depletion - mineral, fossil) and human toxicity potential.Methodology used to conduct analysis and assessment in accordance with ISO14040 and ISO14044 (ecological part) and be third-party-verified by NSF International, or another accredited third-party agency.
  1. Design Mixtures:For each precast concrete mixture.Include compressive strength and water-absorption tests.
  2. Shop Drawings:
  3. Detail fabrication and installation of architectural precast concrete units.
  4. Indicate locations, plans, elevations, dimensions, shapes, and cross sections of each unit.
  5. Indicate joints, reveals, drips, chamfers, and extent and location of each surface finish.
  6. Indicate details at building corners.

Retain subparagraphs below applicable to Project.

  1. Indicate separate face and backup mixture locations and thicknesses.
  2. Indicate type, size, and length of welded connections by AWS standard symbols.Detail loose and cast-in hardware and connections.
  3. Indicate locations, tolerances, and details of anchorage devices to be embedded in or attached to structure or other construction.
  4. Indicate locations, extent, and treatment of dry joints if two-stage casting is proposed.
  5. Include plans and elevations showing unit location and sequence of erection for special conditions.
  6. Indicate location of each architectural precast concrete unit by same identification mark placed on panel.
  7. Indicate relationship of architectural precast concrete units to adjacent materials.
  8. Indicate locations, dimensions, and details of thin-brick units, including corner units and special shapes, and joint treatment.
  9. Indicate locations, dimensions, and details of stone facings, anchors, and joint widths.
  10. If design modifications are proposed to meet performance requirements and field conditions, submit design calculations and Shop Drawings.Do not adversely affect the appearance, durability, or strength of units when modifying details or materials and maintain the general design concept.

Retain "Samples" Paragraph below for single-stage Samples, with a subordinate list if applicable.Coordinate with sample panels and range samples in "Quality Assurance" Article.

  1. Samples:Design reference Samples for initial verification of design intent, for each type of finish indicated on exposed surfaces of architectural precast concrete units, in sets of three, representative of finish, color, and texture variations expected; approximately 12 by 12 by 2 inches (300 by 300 by 50 mm).
  2. When other faces of precast concrete unit are exposed, include Samples illustrating workmanship, color, and texture of backup concrete as well as facing concrete.

Retain subparagraph below if Samples of thin-brick facings are required.

  1. Samples for each thin-brick unit required, showing full range of color and texture expected.Include Sample showing color and texture of joint treatment.

Retain one of or both "Grout Samples for Initial Selection" and "Grout Samples for Verification" subparagraphs below if joints for thin-brick facings are grouted.

  1. Grout Samples for Initial Selection:Color charts consisting of actual sections of grout showing manufacturer's full range of colors.
  2. Grout Samples for Verification:Showing color and texture of joint treatment.

Retain "Delegated-Design Submittal" Paragraph below if design services have been delegated to Contractor.

  1. Delegated-Design Submittal:For architectural precast concrete indicated to comply with performance requirements and design criteria, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.
  2. Show governing panel types, connections, types of reinforcement, including special reinforcement, and concrete cover on reinforcement.Indicate location, type, magnitude, and direction of loads imposed on the building structural frame from architectural precast concrete.

1.7INFORMATIONAL SUBMITTALS

Coordinate "Qualification Data" Paragraph below with qualification requirements in Section014000 "Quality Requirements" and as may be supplemented in "Quality Assurance" Article.

  1. Qualification Data:For [Installer] [fabricator] [testing agency].

Retain "Welding certificates" Paragraph below if retaining "Welding Qualifications" Paragraph in "Quality Assurance" Article.

  1. Welding certificates.

Retain "Material Certificates" Paragraph below to require submittal of material certificates from manufacturers.

  1. Material Certificates:For the following items:
  2. Cementitious materials.
  3. Reinforcing materials and prestressing tendons.
  4. Admixtures.
  5. Bearing pads.
  6. Structural-steel shapes and hollow structural sections.
  7. Thin-brick units and accessories.
  8. Stone anchors.
  9. Insulation.

Retain "Material Test Reports" Paragraph below for material test reports that are Contractor's responsibility.

  1. Material Test Reports:For aggregates, by a qualified testing agency.

Retain "Preconstruction Test Reports" Paragraph below if specifying preconstruction testing in "Preconstruction Testing" Article as Contractor's responsibility.

  1. Preconstruction Test Reports:
  2. Source quality-control test reports.

Retain "Field quality-control(and special inspection) reports" Paragraph below if Contractor is responsible for field quality-control testing and inspecting.Retain option if Contractor is responsible for special inspections.

  1. Field quality-control[and special inspection] reports.

1.8QUALITY ASSURANCE

  1. Fabricator Qualifications: A firm that assumes responsibility for engineering architectural precast concrete units to comply with performance requirements. This responsibility includes preparation of Shop Drawings and comprehensive engineering analysis by a qualified professional engineer.

Usually retain first subparagraph below. PCI plant certification was established in 1967 and is a different program than APA's plant certification established in 1993. Consult APA or PCI for further information.

  1. Designated as a PCI-certified plant for GroupA, CategoryA1 - Architectural Cladding and Load Bearing Units[at time of bidding][or designated as an APA-certified plant for production of architectural precast concrete products].

Retain one of two "Installer Qualifications" paragraphs below if qualifying erectors.Retain first paragraph if PCI-certified erector is required.See PCI's Web site, for current listing of erectors.

  1. Installer Qualifications:A precast concrete erector qualified and designated by PCI's Certificate of Compliance to erect [CategoryA (Architectural Systems) for non-load] [CategoryS2 (Complex Structural Systems) for load]-bearing members.

Retain "Installer Qualifications" Paragraph below if PCI-certified erector is not required or is not available in Project location.Basis of audit is PCIMNL127, "PCI Erector's Manual - Standards and Guidelines for the Erection of Precast Concrete Products."

  1. Installer Qualifications:A precast concrete erector who has retained a "PCI-Certified Field Auditor" to conduct a field audit of a project in same category as this Project and who can produce an Erectors' Post-Audit Declaration.

Retain subparagraph below if required for LEED-NC, LEED-CS, or LEED for SchoolsCreditMR5.

  1. Fabricator is located within 500 miles (800 km) of Project site.

Retain "Testing Agency Qualifications" Paragraph below if Contractor selects testing agency or if Contractor is required to provide the services of a qualified testing agency in "Field Quality Control" Article. Qualification requirements are in addition to those specified in Section01400 "Quality Requirements," which also defines "NRTL" (nationally recognized testing laboratory).".

  1. Testing Agency Qualifications:Qualified in accordance with ASTMC1077 and ASTME329 for testing indicated.
  2. Quality-Control Standard:For manufacturing procedures and testing requirements, quality-control recommendations, and dimensional tolerances for types of units required, comply with PCIMNL117, "Manual for Quality Control for Plants and Production of Architectural Precast Concrete Products."

Retain "Welding Qualifications" Paragraph below if shop or field welding is required.If retaining, also retain "Welding certificates" Paragraph in "Informational Submittals" Article.

  1. Welding Qualifications:Qualify procedures and personnel in accordance with AWSD1.1/D.1.1M, "Structural Welding Code - Steel"; and AWSD1.4/D1.4M, "Structural Welding Code - Reinforcing Steel."

PCI recommends review of preproduction sample panels.Revise number and size of sample panels in "Sample Panels" Paragraph below to suit Project.

  1. Sample Panels:After sample approval and before fabricating architectural precast concrete units, produce a minimum of [two] <Insert number> sample panels approximately [16 sq. ft. (1.5 sq.m)] <Insert dimension> in area for review by Architect.Incorporate full-scale details of architectural features, finishes, textures, and transitions in sample panels.
  2. Locate panels where indicated or, if not indicated, as directed by Architect.
  3. Damage part of an exposed-face surface for each finish, color, and texture, and demonstrate adequacy of repair techniques proposed for repair of surface blemishes.
  4. After acceptance of repair technique, maintain one sample panel at manufacturer's plant and one at Project site in an undisturbed condition as a standard for judging the completed Work.
  5. Demolish and remove sample panels when directed.

PCI recommends production of finish and texture range samples when color and texture uniformity concerns could be an issue, Architect or precaster has not had previous experience with specified mixture and finish, or a large project has multiple approving authorities.

  1. Range Samples:After sample panel approval and before fabricating architectural precast concrete units, produce a minimum of [three] [five] <Insert number> sets of samples, approximately [16 sq. ft. (1.5 sq.m)] <Insert dimension> in area, representing anticipated range of each color and texture on Project's units.Maintain one set of range samples at Project site and remaining range sample sets at manufacturer's plant as color and texture approval reference.
  2. Mockups:After sample panel[and range sample] approval but before production of architectural precast concrete units, construct full-sized mockups to verify selections made under Sample submittals, to demonstrate aesthetic effects, and to set quality standards for materials and execution.

Revise or delete three subparagraphs below to suit Project.

  1. Build mockup as indicated on Drawings including [aluminum framing, glass, sealants,] <Insert construction> and architectural precast concrete complete with anchors, connections, flashings, and joint fillers.
  2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Architect specifically approves such deviations in writing.

Retain subparagraph below if the intention is to make an exception to the default requirement in Section014000 "Quality Requirements" for demolishing and removing mockups.

  1. Subject to compliance with requirements, approved mockups may become part of the completed Work if undamaged at time of Substantial Completion.

If retaining "Preconstruction Testing Mockup" Paragraph below, determine where preconstruction mockup testing will be specified and include requirements in that Section.Requirements below are limited to building a preconstruction testing mockup at a testing agency's facility.

  1. Preconstruction Testing Mockup:Provide a full-size mockup of architectural precast concrete indicated on Drawings for preconstruction testing.See SectionInsert Section number> "<Insert Section title>" for preconstruction testing requirements.

Revise or delete subparagraphs below to suit Project.Coordinate with other Sections that include construction to be included in a preconstruction testing mockup to clearly indicate extent of work required in this Section.

  1. Build preconstruction testing mockup as indicated on Drawings including [aluminum framing, glass, sealants,] <Insert construction> and architectural precast concrete complete with anchors, connections, flashings, and joint fillers.
  2. Build preconstruction testing mockup at testing agency facility.

1.9PRECONSTRUCTION TESTING

Retain this article for preconstruction stone anchor testing if stone facing is used and Contractor designs stone anchorage system.

  1. Preconstruction Stone Anchor Testing:Engage a qualified testing agency to perform preconstruction testing in accordance with ASTMC1354/C1354M or ASTME488, modified as follows:
  2. Furnish test specimens, including stone anchors, that are representative of materials proposed for incorporation into the Work.
  3. Anchorage Tests:Test 12 inches (300 mm) square samples for[each combination of] stone variety, orientation of cut, finish, and anchor type proposed for use on Project.Test for shear and tensile strength of anchorage system.

1.10COORDINATION

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