Architectural Concrete FloorsME- Building Group

SECTION 033030 – ARCHITECTURAL CONCRETE FLOORS

PART 1 - GENERAL

1.1RELATED DOCUMENTS

Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.

1.2SUMMARY

  1. This Section specifies cast-in place concrete, including formwork, reinforcing, mix design, placement procedures, and finishes.
  2. Interior slab-on-grade as detailed.
  3. Elevated floor slabs.
  4. Polish finish of designated floor slabs.
  1. Related Work Specified In Other Sections:
  2. Division 3 Section "Cast-In-Place Concrete" for basic concrete work.
  3. Division 3 Section “Industrial and Polished Concrete Floor Slabs” for industrial floor slabs.
  4. Division 3 Section “Industrial And Polished Concrete Floor Slabs With Shake” for industrial floor slabs with shake
  5. Division 3 Section “Elevated Industrial and Polished Concrete Floor Slabs” for elevated floor slabs
  6. Division 5 Section “Metal Fabrications” for items cast in to floor slabs.
  7. Division 7 Section “Joint Sealants” for elastomeric joint sealants in contraction and other joints in cast-in-place concrete.

1.3POLISHED CONCRETE PERFORMANCE REQUIREMENTS

  1. Installation of polished concrete floor system for interior concrete floor by dry grinding and polishing with various size grit metal-bonded and resin-bonded diamonds and application of concrete densifier.
  2. Slabs to receive Diamond Grind and Polish Process must have a minimum 1/8” of cream andfines atsurface. Proof of cream and fines will be required via core samples taken atrandom perimeter locations at2’ from edge of any pour by testing agency. Locations of cores will be determined by Owner and Owner’s Representative. Visual inspection and approval by testing agency, Ownerand Owners Representative will validate required deliverable.
  3. Definition: Concrete polishing is a process of “cracking the cap” by diamond grinding the concrete surface andremoving imperfections left by concrete installer, spraying on deep penetrating lithium chemistry densifier per manufactures instructions, grinding off any densifier residue from surface of slab, begin diamond polishing to desired gloss meter reading requirements, spraying on final lithium poly silicate concrete sealer per manufacturer instructions followed immediately with finish cleaning of polished slab(s)using common scrubber, soft white nylon heads and neutral PH soap specifically designed to clean Polished Concrete surfaces per polishing provider recommendations/requirements. The result is a polished concrete floor that will not dust, is resistant to penetration from oils, and provides an additional 35% or more of reflected light and slip coefficients that surpass standard code requirements/recommendations.
  4. Process may be either a proprietary system from specialty contractor or use of specified products with acceptable detailed process in compliance with definition above and approved by Ownerand Owners Representative.
  5. Acceptable Grinding Methods: Equipment and techniques defined above that .produce documented results of concrete finishes meeting or exceeding the following: Required FF, FL, Gloss Meter readings, slip coefficient minimums and light reflected percentages as measured with a specular gloss measurement device defined in this specification. Specifically a min diamond grind of not less than 1/32” or as required will be removed from the slab surface to expose constant sands and fines for a “salt and pepper” finish and eliminate imperfections on surface of slab from the concrete finishing process i.e.: float ridges including swirl patterns from pan and black scorch marks from concrete finishing.
  6. Specular Gloss/Reflectance, ASTM D 523: Specular gloss/reflectance to be measured and recorded in a consistent 15-foot grid pattern between each grit series. Final reflectance per Concrete Polishing Association of America (CPAA) and International Polished Concrete Institute (IPCI) Level 4 Gloss Shine – 3000 grit – Very High Gloss Appearance. Glossmeter reading of localminimums of30with an overall average of 40 measured at a 60 deg angle atfloor surface as measured by Horida IG-320 High-resolution digital gloss meter.
  1. Polished concrete process shall be dry diamond method utilizing direct connect HEPA filtration system, Metal bonded diamond heads for grind w/ hybrid resin bonded diamond heads for polishing on a multi-orbital planetary action opposing rotational head machine(s) acceptable to Owner or Owner’s Representative.
  1. Coordination: Contractor shall coordinate the following:
  2. Concrete placement, floating, vibrating, panning, pure wet curing, location of cores and review of cores providing evidence of 1/8” cream and fines atslab surface will be coordinated with the Polisher, Owner and Owners Representative for approval prior to beginning grind and polish procedure.
  3. Schedule of slab pore sequence in conjunction with grind and polish sequence as well as detailed specific grind andpolish procedures, means andmethods will be placed in writing and provided to Owner and Owners Representative for approval prior to beginning work.
  4. Grind and Polishing Process can begin at 7 to 10 days after wet cure when slab has attained sufficient strength so not to displace aggregate or fiber reinforcing as determined by the Polishing provider after field inspection.
  5. Scheduling of joint sealant installation will be provided to Ownerand Owners Representative for approval. Joints will be places at specified time after Polish completion.
  6. Cleaning of concrete surface prior to and after Polished Concrete Process will be performed by concrete installer. Cleaning completion procedures and materials pre and post polish will comply with Polishing contractor’s recommendations to maintain finished polish floor surface.
  7. Polishing contractor will clean finished Polished Concrete Floors at minimum three (3) times as part of Polished Concrete Process prior to requesting final inspection by Owner and Owner’s representative.
  8. Slip Resistance: Static coefficient of friction shall be 0.6 for level floors and 0.8 for ramped surfaces as recommended by the ADA Accessibility Guidelines (ADAAG).
  9. Testing shall be in accordance with ASTM C1028 or use of similar devices recognized by ADAAG.

1.4SUBMITTALS

  1. Source of ready-mixed concrete for approval.
  2. LEED Submittals:

Retain first subparagraph below if recycled content is required for LEED-NC or LEED-CI CreditsMR4.1 and MR4.2. An alternative method of complying with CreditMR4.1 and MR4.2 requirements is to retain requirement in Division01 Section "Sustainable Design Requirements" that gives Contractor the option and responsibility for determining how CreditMR4.1 and MR4.2 requirements will be met.

  1. Product Data for Credit MR4: For products having recycled content, documentation indicating percentages by weight of postconsumer and pre-consumer recycled content.
  2. Include documentation from product manufacturer indicating costs for each product having recycled content.
  3. Product Data for Credit MR 5: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material manufacturing location and the point of extraction, harvest, or recovery for each raw material.
  4. Include documentation on distance to project, contractor cost for each regional material, and percent by weight that is considered regional.
  5. Product Data for IEQ 4.3 for liquid floor treatments and curing and sealing compounds, documentation including printed statement of VOC content.

Retain subparagraph below if ground granulated blast-furnace slag, is used as portland cement replacements for LEED-NC Credit ID1.1. To achieve this credit, replacement materials must be substituted for min. 25 to max. 40 percent of the portland cement that would otherwise be used.

  1. Design Mixtures for Credit ID1.1: For each concrete mixture containing a replacement for Portland Cement, and for equivalent concrete mixtures that do not contain Portland Cement replacements.
  1. Bid Submittals: With the bid submit the following:
  2. Name of trade to perform diamond grind & polish.
  3. Qualification data for those to perform concrete polishing.
  4. Synopsis of concrete polishing process and description of equipment intended to be used. Include intended grinding and polishing process steps.
  5. Provide a cost per square foot for ‘Conventional Mechanical Polishing’ and ‘Light Polishing’
  1. Manufacturer's product data, performance criteria and other documentation for each material specified in this Section that is proposed for use, including:
  2. Admixtures.
  3. Liquid curing compound.
  4. If products have not been reviewed and accepted by Chrysler Health or Environmental groups, include MSDS information as a separate submittal directed to the Owner for review.
  5. Pre-molded joint filler.
  6. Reinforcing fibers for slab on grade.
  7. Bonding agent.
  8. Joint sealants.
  9. Shop drawings including the following:
  10. Locations of drains, trenches, manholes, and other items for slab on grade.
  11. Floor joint layout indicating:
  12. Number and sequence of placements.
  13. Sizes and shapes of placements (shapes shall be square or rectangular only).
  14. Types (construction or control) and spacing of joints.
  15. Shop drawings for reinforcement detailing fabricating, bending, and placing concrete reinforcement. Comply with ACI 315.99 "Manual of Engineering and Placing Drawings for Reinforced Concrete Structures" showing bar schedules, stirrup spacing, bent bar diagrams, and arrangement of concrete reinforcement.
  16. Include the following:
  17. Proposed method for bulkheads and formwork.
  18. Proposed placement equipment.
  19. Schedule of events and casting plan regarding placement operations, and records of concrete casts.
  20. Mill test certification for slit sheet steel fiber reinforcement in accordance with the latest issue of ASTM A820 for Type 2 steel fibers at slab-on-grade.
  21. Certification of chloride ion content from admixture suppliers.
  22. Fiber supplier to include steel fiber Identity Chart with submittal to support the proposed dosage rate of 35 pounds per cubic yard.
  1. Concrete Mix Design: Submit concrete supplier's concrete mix design information based on requirements specified in "Concrete Mix Proportions".
  2. Submit a concrete mix design prepared by either the “laboratory trial batch” or the field experience” method as specified in the latest issue of ACI 318, Section 5.3 or CSA A 23.1 for approval. Provide proportions of cement, fine aggregate, coarse aggregate, and water.
  3. Submit product data sheet including ASTM fiber type, wire tensile strength, fiber dimensions, aspect ratio, number of fibers per pound, and shape of the steel fiber.
  4. Mix design shall be sealed by a professional engineered registered in the State of [Insert project location].
  5. Submit concrete mix design approval from the steel fiber manufacturer for slab on grade.
  6. Samples of aggregates shall be furnished by the Contractor as required, together with tests for hardness, durability, density, absorption, etc., referenced in ASTM C33.
  7. Certificates: Each load of ready mixed concrete shall be accompanied by triplicate certificates (batch tickets) submitted for approval for each batch discharged indicating project identification name and number, mix type, and listing ingredients, including quantities and types of admixtures, total water, time when water was introduced into the mix, place and date of delivery, amount of concrete in cubic meters, mix time, reading of revolution counter at first addition of water, etc. Identify separately amounts of water added at batch plant and water added on site. To be submitted to Owner after each pour.
  8. Completed pre-pour sign-off cards.
  9. Survey of slab base prior to pour and signed off by Owner or Owner’s representative.
  10. Schedule: Submit schedule of pour sequence including slab pour duration, slab polishing, and joint sealant installation on plan drawings.
  11. Qualification Data: For those performing concrete polishing.
  12. Polishing Process: Contractor to submit detailed means and methods for slab polishing process including step by step polishing procedures to be used on the project. This includes identification of machines for grinding process being used, diamond pad grits through the process, application of densifier/sealer, and cleaning procedure.
  13. Field quality-control reports:
  14. Material Test Reports: For the following, from a qualified testing agency, indicating compliance with requirements:
  15. Aggregates. Include service data indicating absence of deleterious expansion of concrete due to alkali aggregate reactivity.
  16. Floor surface flatness and levelness measurements including compliance with specified tolerances.
  17. Minutes of pre-installation conference.

1.5QUALITY ASSURANCE

  1. Comply with applicable provisions of Division 3 Section "Cast-In-Place Concrete".
  1. Codes and Standards: Comply with provisions of the following codes, specifications, and standards, except where more stringent requirements are shown or specified:
  2. American Concrete Institute Latest Issue of ACI 301, "Specifications for Structural Concrete for Buildings."
  3. Latest Issue of ACI 318, "Building Code Requirements for Reinforced Concrete."
  4. Concrete Reinforcing Steel Institute (CRSI) "Manual of Standard Practice."
  1. Installer Qualifications: A qualified installer who employs on Project personnel qualified as ACI-certified Flatwork Technician and Finisher and a supervisor who is an ACI-certified Concrete Flatwork Technician.
  2. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete products and that complies with the latest issue of ASTMC94/C94M requirements for production facilities and equipment.

Retain subparagraph below if required.

  1. Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete Production Facilities."

Retain first paragraph below if Contractor or manufacturer retains testing agency for concrete mixture design, material test reports, or field quality control. Retain option if field quality-control testing agency employed by Contractor must be approved by authorities having jurisdiction.

  1. Testing Agency Qualifications: An independent agency,acceptable to authorities having jurisdiction, qualified according to the latest issues of ASTMC1077 and ASTME329 for testing indicated.

Retain first subparagraph below, required by ACI301 and ASTMC31/C31M if emphasis is needed. ASTMC1077 notes relevant field or laboratory technician certification by ACI, NRMCA, and PCA, or the National Institute for Certification in Engineering Technologies may demonstrate evidence of competence.

  1. Personnel conducting field tests shall be qualified as ACI Concrete Field Testing Technician, Grade1, according to ACICP-1 or an equivalent certification program.

Retain subparagraph below if requiring minimum qualifications for laboratory personnel performing testing and for laboratory supervisor.

  1. Personnel performing laboratory tests shall be ACI-certified Concrete Strength Testing Technician and Concrete Laboratory Testing Technician - GradeI. Testing Agency laboratory supervisor shall be an ACI-certified Concrete Laboratory Testing Technician - GradeII.
  1. Source Limitations: Obtain each type or class of cementitious material of the same brand from the same manufacturer's plant, obtain aggregate from single source, and obtain admixtures from single source from single manufacturer.

Retain "Welding Qualifications" Paragraph below if shop or field welding is required. If retaining, also retain "Welding certificates" Paragraph in "Informational Submittals" Article. The American Welding Society (AWS) states that welding qualifications remain in effect indefinitely unless welding personnel have not welded for more than six months or there is a specific reason to question their ability.

  1. Welding Qualifications: Qualify procedures and personnel according to AWSD1.4/D1.4M, "Structural Welding Code - Reinforcing Steel."
  2. ACI Publications: Comply with the following unless modified by requirements in the Contract Documents:

Retain second option in first subparagraph below if ACI301, for structural lightweight concrete is applicable.

  1. The latest issue of ACI301, "Specifications for Structural Concrete," Sections1 through 5.
  2. The latest issue of ACI117, "Specifications for Tolerances for Concrete Construction and Materials."
  1. Ready Mix Plant Qualifications: Plant experienced in furnishing ready mixed concrete similar to that indicated for this Project and with a record of successful in-service performance as well as sufficient production capacity to produce required quantity without delaying the Work. Plant shall have adequate storage and handling facilities for material and shall be equipped for accurate weighing, measuring, and control of materials, quantities, mixing, and delivery of concrete meeting specified requirements.
  2. Concrete Testing Service: Engage a qualified independent testing agency to perform material evaluation tests and to design concrete mixtures.
  1. Materials and installed work may require testing and retesting at any time during progress of Work. Tests, including retesting of rejected materials for installed Work, shall be done at Contractor's expense.
  2. Institute a "Concrete Pre-Pour Sign-Off Card" for the placement of concrete floor slabs.
  3. Sign-Off Card shall, at a minimum, consist of a checklist for verification of the following items:
  4. Compaction of sub grade and sub base materials and sub grade elevation.
  5. Installation of underground utilities at slab on grade.
  6. Installation of required reinforcing steel at elevated slabs.
  7. Installation of miscellaneous steel embeds.
  8. Locations of shallow utilities have been reviewed by firm placing concrete at slab on grade.
  9. Floor drains, cleanouts, handholds, etc. have been set to required top elevations at slab on grade.
  10. Concrete forms have been set to specified elevation and level tolerances, and have received form release agent application.
  11. Saw cutting equipment, additional lighting (if necessary) and wiring materials are present on site.
  12. Base is installed to correct elevation and is not less than specified tolerance in any circumstance at slab on grade.
  13. Assign a superintendent who is designated to supervise concrete placement operations.
  14. Prior to placing each section of concrete the Contractor's superintendent shall obtain signatures from the various trade subcontractors involved in the checklist items mentioned above. After signatures are obtained, the Contractor's superintendent shall sign the card as well.
  15. Submit the original card to the Owner's Representative with copies to the Architect/Engineer, concrete flooring installer, and other signatories to the cards.
  16. Pre-installation Conference: Prior to start of work, conduct conference at Project site with all parties associated with work of this Section. Notify participants at least 5 working days before conference.
  17. Meet with representatives of the Owner; Architect/Engineer; testing and inspecting agency; concrete producer; concrete slab installer/finisher; virgin polypropylene fiber manufacturer; admixture manufacturer; concrete polishing contractor and others whose work interfaces with or directly affects floor slab placement.
  18. Review methods and procedures related to work of this Section.
  19. Examine sub grade conditions for compliance with requirements, including flatness and modulus of sub grade reaction.
  20. Discuss plans to execute the work, scheduling, equipment, assignments, and storage procedures.
  21. Discuss the following as a minimum:
  22. Concrete mix design and control of same.
  23. Trial batching.
  24. Sub grade and sub base preparation at slab on grade.
  25. Placement procedures for:

1)Form work (slab on grade and elevated slab metal form deck).