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Polished Concrete Finishing

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Polished Concrete Finishing Model Group/3CDC Willkommen Renovations CITY STUDIOS ARCHITECTURE Cincinnati, Ohio SECTION 033543 - POLISHED CONCRETE FINISHING PART 1 - GENERAL 1.1 SUMMARY A. Section includes polished concrete finishing, including scoring and joint filling. 1. Concrete for polished concrete, including formwork, reinforcement, concrete materials, mixture design, placement procedures, initial finishing, and curing is specified in Section 033000 "Cast-in-Place Concrete." 1.2 DEFINITIONS A. Polished Concrete: The multi-step operation of mechanically grinding, honing, polishing of a concrete floor surface with bonded abrasives to cut a concrete floor surface and to refine each cut to the maximum potential to achieve a specified level of finished gloss as defined by the Concrete Polishing Association of America (CPAA). 1.3 PREINSTALLATION MEETINGS A. Preinstallation Conference: Conduct conference at Project site. 1. Before submitting design mixtures, review concrete design mixture and examine procedures for ensuring quality of concrete materials. Require representatives of each entity directly concerned with polished concrete to attend, including the following: a. Contractor's superintendent. b. Independent testing agency responsible for concrete design mixtures. c. Ready-mix concrete manufacturer. d. Cast-in-place concrete subcontractor. e. Polished concrete finishing Subcontractor. f. Concrete finishing system manufacturer's field representative. 2. Review cold- and hot-weather concreting procedures, curing procedures, construction joints, concrete repair procedures, concrete finishing, and protection of polished concrete. 1.4 ACTION SUBMITTALS A. Product Data: For each type of product. B. Polishing Schedule: Submit plan showing polished concrete surfaces and schedule of polishing operations for each area of polished concrete before start of polishing operations. Include locations of all joints, including construction joints. POLISHED CONCRETE FINISHING 033543 - 1 Model Group/3CDC Willkommen Renovations CITY STUDIOS ARCHITECTURE Cincinnati, Ohio 1.5 INFORMATIONAL SUBMITTALS A. Qualification Data: For Installer. B. Material Certificates: For liquid floor treatments. 1.6 QUALITY ASSURANCE A. Installer Qualifications: A firm experienced in performing polished concrete finishing similar in material, design, and extent to that indicated for this Project, whose work has resulted in applications with a record of successful in-service performance, and that employs workers trained by manufacturer. B. Source Limitations for Polished Concrete Finishing Materials: Obtain concrete floor liquid treatment products of one manufacturer with resources to provide products of consistent quality in physical properties and resulting appearance. C. Mockups: Before casting concrete, build mockups to verify selections made under Sample submittals and to demonstrate typical joints, surface finish, tolerances, and standard of workmanship. Build mockups to comply with the following requirements, using materials indicated for the completed Work: 1. Build mockups in location and of size indicated or, if not indicated, as directed by Architect. 2. Provide mockup area lighting similar in illumination, lumen output, color temperature, and both height and distance from surface as that of final areas to receive polished concrete finishing. 3. Use the same personnel, equipment, tools and methods as will be used for the remaining interior floor slab. 4. Mockup shall demonstrate each color, pattern, all joint treatments, inside wall edge treatments, and any protective sealers. Mockup shall include region of hand polishing, as required against walls, etc. 5. Demonstrate curing, finishing, and protecting of polished concrete. 6. Do not begin full scale product applications, floor polishing operations, or deliver major materials until Architect has approved mockup. 7. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion. 1.7 FIELD CONDITIONS A. Traffic Control: Maintain access for vehicular and pedestrian traffic as required for other construction activities. POLISHED CONCRETE FINISHING 033543 - 2 Model Group/3CDC Willkommen Renovations CITY STUDIOS ARCHITECTURE Cincinnati, Ohio PART 2 - PRODUCTS 2.1 LIQUID FLOOR TREATMENTS A. Penetrating Liquid Floor Treatments for Polished Concrete Finish: Clear, waterborne solution of inorganic silicate or siliconate materials and proprietary components; odorless; that penetrates, hardens, and is suitable for polished concrete surfaces. 1. Products: Subject to compliance with requirements, provide one of the following: a. Advanced Floor Products; Retro Plate 99. b. ARDEX Americas; PC 50 Lithium Densifier. c. Euclid Chemical Company (The); an RPM company; Euco Diamond Hard. d. L&M Construction Chemicals, Inc; FGS Hardener Plus. e. QuestMark; DiamondQuest Densifying Impregnator. f. Vexcon Chemicals Inc.; Certi-Shine Clear. 2.2 RELATED MATERIALS A. Joint Sealants: Provide joint sealants, backings, and other related materials that are compatible with one another and with joint substrates under conditions of service and application, as demonstrated by joint-sealant manufacturer, based on testing and field experience. B. Joint Sealant: As specified in Section 079000 "Joint Sealants." C. Semirigid Polyurea Joint Filler: Two-component, semirigid, 100 percent solids, aromatic polyurea with a Type A shore durometer hardness range of 64 to 68 according to ASTM D 2240, and meeting requirements of ACI 302. 1. Product: Subject to compliance with requirements, provide one of the following: a. Euclid Chemical Company; QWIKjoint UVR 65. b. HI-TECH Systems; HT-PE65 Flexible Control Joint Filler. c. Metzger/McGuire Co.; Spal-Pro RS-65. PART 3 - EXECUTION 3.1 PREPARATION A. Surface Preparation And Cleaning: 1. Utilizing non-powered, hand-held tools and only mild cleaning chemicals that will not damage or mar concrete surface, remove remaining saw cut residue, form glue, texture overspray, paint drippings, and other built-up material on the floor surface. 2. Power-sweep floor area with dust-free equipment. 3. Treat oil spots with oil emulsifier and oil absorbent materials to remove oils from below concrete surface. Scrub oil spot areas and remove liquids with vacuum. POLISHED CONCRETE FINISHING 033543 - 3 Model Group/3CDC Willkommen Renovations CITY STUDIOS ARCHITECTURE Cincinnati, Ohio 4. Scrub floor with automatic scrubber capable of a minimum of 80 pounds head pressure, each head to be equipped with cleaning combo or light grit brushes and a neutral pH cleaning detergent that is compatible with the liquid densifier/sealer. Remove liquid as floor is scrubbed. Scrub floor a second and final time with clean water only and remove liquid as floor is scrubbed. Allow slab to air dry. B. Prior to commencement of polished concrete finishing, test floors to receive polished concrete finishing for moisture vapor emission in accordance with ASTM F 1869 "Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Subfloor Using Anhydrous Calcium Chloride". Rate shall not exceed 5 lbs. per 1,000 square feet in 24 hours prior to commencement. 3.2 SCORING A. Scoring: Score decorative jointing in concrete surfaces 1/4 inch (6.4 mm) deep with diamond blades to match pattern indicated. Rinse until water is clear. a. Joint Width: 3/8 inch (10 mm). 3.3 POLISHING A. Polishing Process Timing: Allow concrete floor slab to cure minimum of 28 days prior to commencing polished concrete finishing. B. Finish: Class B, Fine Aggregate (Salt and Pepper) Finish: Remove not more than 1/16 inch of concrete surface by grinding and polishing resulting in majority of exposure displaying fine aggregate with no, or small amount of, medium aggregate at random locations. C. Polish: Level 3: High sheen, 1500 grit. D. Apply polished concrete finish system to cured and prepared slabs to match accepted mockup. 1. Machine grind floor surfaces to receive polished finishes level and smooth and to depth required to reveal aggregate to match approved mockup. 2. Once concrete has been polished to 400 grit resin tooling level or equivalent apply penetrating liquid floor treatment per manufacturer’s written instructions. Allow adequate drying time per manufacturer’s recommendations. 3. Continue polishing with progressively finer-grit diamond polishing pads to gloss level, to match approved mockup. 4. Control and dispose of waste products produced by grinding and polishing operations. 5. Neutralize and clean polished floor surfaces. 3.4 JOINT FILLING A. Prepare, clean, and install joint filler according to manufacturer's written instructions. 1. Defer joint filling until concrete has aged at least one month. Do not fill joints until construction traffic has permanently ceased. POLISHED CONCRETE FINISHING 033543 - 4 Model Group/3CDC Willkommen Renovations CITY STUDIOS ARCHITECTURE Cincinnati, Ohio B. Remove dirt, debris, saw cuttings, laitance, curing compounds, sealers and other foreign materials from joints. Leave contact faces of joints clean and dry. 1. Clean inner joint walls mechanically using dustless dry-cut saw, or similar tool, to the full depth of saw cuts and 2 inch minimum depth in construction joints so as to remove any form release agents, curing compounds, sealer residues, and other surface contaminations that may interfere with bond of the specified joint filler material. Then clean dust and debris from mechanically prepared joints by vacuuming joint. C. Install semirigid joint filler full
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