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– Old school polishing systems require unfeasible maintenance. Results are illusory by means of diamond tooling contamination transfer, topical sealers and coatings over a ground, fragmented surface.
– Due to the slow economy, the norm is that contractors are undercutting each other and what the client receives at the end of the day is a measured, “shinny” hone sold as a polish, either for bypassing the initial, canvas setting – grind, essential for reflection (as opposed to refraction), skipping steps, or not reaching tool potential, defeating the purpose all together. The outcome are unsustainable surfaces, and sadly, there is a shift back to VCT, toppings, tile, topical sealers and coatings, carpet, etc. At the end of the day, you get what you pay for…or not.
– The ‘proof is in the pudding’ at a recent job illustrations. The first shows shoddy edging; scratches and gouges leading to a rough surface, dull finish. Then on, remaining photos show porosity, damage and scratches in the field. We hope this is enough information to demonstrate how your hard earned money will go to poor workmanship and old paradigm dry polishing with diamond tooling grit/scratch progression failure.
Come to us for a turning point. Wet topical cut & fill refinement to attain pre-specified surface profile gauge readings to the millionths inch leaving no pores or scratches, in less steps, with no mess. Our heavy duty edging machines (both electric and propane) are capable of delivering a seemless feather between edge and field.
The upmost, underestimated -thereby underpaid- flooring investment concept today is the fine crafted, LEED credited, polished concrete slab (a portland cement and aggregate water mix, steel reinforced structure). We are certified both in polished concrete and polished concrete cement mix-pour-finish. Start at the ‘ground floor’ specs.
Large dust collection equipment will not prevent airborne, harmful silica that recirculates in AC ducts, clogs the coils and will easily get smoke alarms triggered in the process. OSHA ruling defines regulations on dry vs. wet and recommends wet grinding (as used conventionally in Europe) … “Vacuum methods can significantly reduce dust emissions, but thus far have not been shown to reliably keep silica levels below 0.1 mg/cubic meter (PEL-permissible exposure limit)…” But establishes that “… Water provides excellent dust control during tasks involving abrasive action on concrete. When applied at the point where dust is generated, water wets the dust particles before they can become airborne…” Our tools and machinery were designed for neat, wet grinding, and concrete slurry is processed to landfill safety compliance. We’re not drain dumping club members.
Tax money going to unclog drains from cement slurry that kills animals and plants.
We’re a long ways from California’s $200K fine!
Our maintenance services consist of a continuous refinement program to address micro abrasion; hence the key to sustainabillity. Initial polishing is coupled with a gauge monitored, tool specific system – a cleaning solution and automatic scrubber to emulsify soil, re-grout, re-densify and re-polish to a peaking point.
With scientific trial & error, we abide by cutting edge standards. If the treatment is sustainable, rapport prevails in a born again industry. Focusing on savvy, fine craftsmanship, we pulled out of the race to the bottom of the barrel of one company’s mouse trap vs. another.
SERVICES – FEES
CONCRETE SOLUTIONS – ULTRA SURFACE PRODUCTS · USG – LEVELROCK · DECORATIVE CONCRETE INSTITUTE – BOB HARRIS, COLOR MAKER FLOORS · OUTSTANDING FLOOR GROUP – CONCRETE FLOOR TRAINING · SUPERABRASIVE – CONCRETE GRINDING AND POLISHING · XTREME POLISHING SYSTEMS – CONCRETE FLOOR TRAINING · ENGRAVE-A-CRETE – AMANO PROPANE MACHINES · AND KALEIDOCRETE · ARDEX – DIAMATIC ULTRAFLOOR POLISHING SYSTEM · ARDEX – DESIGNER FLOORS · GMI ENGINEERED PRODUCTS – CRMX CONCRETE POLISHING SYSTEM · CSDA – ST-115 CERTIFIED OPERATOR · SILEX – CERTIFIED POLISHING AND TRAINING PROGRAM · NATURAL STONE SOLUTIONS – ENGINEER STATUS FOR NSS AND STI P/M MACHINES, DIAMOND TOOLS AND SYSTEMS
ARCHITECTURAL POLISHED CONCRETE
Concrete Slab on Grade to be Polished – Performance Based Specification
This Section includes slab on grade concrete, including concrete materials, mixture design, placement procedures, finishes, curing and mechanical polishing technique for slabs to receive concrete polishing. Complete Slab-on-Grade Concrete system intended for decorative purposes to specified STG (Surface Texture Grade) and sustainability.
SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- 1.1. American Society for Testing and Materials
- 1.1.1. ASTM C779, Standard Test Method for Abrasion Resistance of Horizontal Concrete Surface
- 1.1.2. ASTM G23-81, Ultraviolet Light & Water Spray
- 1.1.3. ASTM C805, Impact Strength, Rebound Test
- 1.1.4. ASTM 1028, Slip Coefficient (Withdrawn Standard by ASTM, June 2014)
- 1.1.5. ASTM C1585, Standard for Test Method for Measurement of Rate of Absorption of Water by Hydraulic-Cement Concretes
- 1.1.6. ASTM C156, Test Method for Water Loss Through Liquid Membrane-Forming Curing Compounds for Concrete
- 1.1.7. ASTM C1315, Specifications for Liquid Membrane-Forming Compounds Having Special Properties for Curing and Sealing Concrete
- 1.1.8. ASTM E1155-96 Standard Test Method for Determining Ff Floor Flatness and Fl Floor Levelness Numbers
- 1.1.9. ASTM C143/C143M-12, Standard Test Method for Slump of Hydraulic-Cement Concrete
- 1.1.10. ASTM D5767, Standard Test Method for Determining Distinction of Image (DOI)
- 1.2. American Concrete Institute
- 1.2.1. ACI 302.1R-89, Guide for Concrete Floor and Slab Construction.
- 1.2.2. ACI 117, Specifications for Tolerances for Concrete Construction and Materials
- 1.2.3. ACI 301, Specifications for Structural Concrete
- 1.2.4. ACI 302.1R, Guide for Concrete Floor and Slab Construction
- 1.2.5. ACI 302.2R, Guide for Concrete Slabs that Receive Moisture-Sensitive Flooring Materials
- 1.2.6. ACI 305.1, Specifications for Hot Weather Concreting
- 1.2.7. ACI 306.1, Specifications for Cold Weather Concreting
- 1.2.8. ACI 308.1, Guide for Curing Concrete
- 1.2.9. ACI 310, Guide for Decorative Concrete
- 1.3. Concrete Sawing and Drilling Association
- 1.3.1. ST 115, Measuring Concrete Micro Surface Texture
SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- 2.1. Comply with applicable provisions of Sections setting forth Product Requirements
- 2.1.1. Provide submittal information within 30 days after Contractor has received Owner’s Notice to Proceed.
- 2.2. Product Data
- 2.2.1. Submit Material Safety Data Sheets as required.
- 2.2.2. Submit concrete maintenance requirements within 14 days of finishing process.
- 2.3. Design Mixtures
- 2.3.1. For each concrete mixture. Submit alternate design mixtures when characteristics of materials, project conditions, weather, test results, or other circumstances warrant adjustments. ASTM C 1260 Concrete Aggregate Supplier Statement of Potential Reactivity of Aggregates
- 2.3.2. Product data for concrete materials admixtures.
3.0 QUALITY ASSURANCE
- 3.1. Installer Qualifications
- 3.1.1. Use an experienced and approved CSDA ST115 Certified Specialist and adequate number of skilled workpeople who are trained and experienced in the work involving concrete polishing and new
- placement concrete surface texturing. Use trained and Certified CRMXTM applicators for all
- concrete finishes that are designated to be polished.
- 3.1.2. Use an experienced and approved ACI-certified Placement/Flatwork Technician and Finisher. The flat work/floor slab sub-contractor will provide up to 5 projects where the finished floor was used for decorative, polished concrete purposes. The owner reserves the right to disqualify any sub- contractor that they believe does not possess the skills necessary to place and finish the flat work concrete.
- 3.1.3. Provide a letter of certification from concrete finishing and grinding equipment manufacturer stating installer is a certified applicator of approved material and their machines and equipment is capable of complying with the specified Surface Texture Grades (STG) and conforms to proper performance of work in this section.
- 3.1.4. Concrete Testing Service: Owner will employ a testing laboratory acceptable to owner’s quality control standards and performance based criteria.
- 3.1.5. Inspection service shall, prior to concrete placement, test all trench backfill and hand probe for sub grade for any soft areas.
- 3.1.6. Inspect the forms to insure proper slab thickness, inspect the placement of dowels and reinforcement steel prior to and during concrete placement.
- 3.1.7. Check ready-mix tickets to insure approved mix is being used.
SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- 3.1.8. Insure that the design water content is not exceeded. Inspection agency will provide batch plant inspection for the first slab pour. The batch plant inspector will determine the actual amount of water in the truck including the moisture content of the fine aggregate. This information will be forwarded to the job site inspector. Ready Mix Company should also include the total water added at the plant on their ticket. Trim water added on site shall also be data provided to the testing agency by the ready mix producer.
- 3.1.9. Source inspection of local aggregate used in mix to assure proper hardness and gradation.
- 3.1.10. Inspector shall make a minimum of one “unannounced” complete batch plant inspection during course of project.
- 3.1.11. Perform the following tests:
- Check temperature of concrete from each truck.
- Perform slump test and fabricate three cylinders for each 90 cubic yards. Test cylinders at 7, 14 and 28 days with one hold specimen.
- Perform ASTM C138, Density (Unit Weight) for yield and air content.
- 3.1.12. Testing inspector has the authority to reject the concrete for any one of the following reasons:
- The slump exceeds 6 inches.
- The temperature of the concrete exceeds 95 deg. F.
- The concrete is in the truck for more than 90 minutes.
- Samples shall be taken at a frequency of 1 per 200 cubic yards or each day of production of interior slab concrete, whichever is less for the purpose of shrinkage testing. Each sample shall be tested for shrinkage in accordance with ASTM C157, except that the initial curing period shall be 7 days.
3.2. Source Limitations
- 3.2.1. Obtain each type or class of cement material of the same brand from the same manufacturer’s plant, obtain aggregate from one source, and obtain admixtures through one source from a single manufacturer.
- 3.2.2. Pre installation Conference: Conduct a pre slab placement meeting at project site for interior floor slabs on grade to be polished.
- 3.2.3. Review special inspection, testing and inspecting agency procedures for field quality control, concrete finishes and finishing, cold- and hot-weather concreting procedures, curing procedures, construction, contraction and isolation joints, joint-filler strips, semi-rigid joint filler, forms and form removal limitations, floor flatness and levelness measurement, concrete repair procedures, and concrete protection.
- 3.2.4. The following representatives of each entity directly concerned with the floor slabs on grade are
- required to attend job site meetings:
- Owners Representatives/ Construction Management Group
- General Contractor superintendent
- Independent concrete testing agency hired by the GC
- Ready-mix concrete producer
- Concrete placement contractor
- Slab on grade finishing subcontractor
- Conveying subcontractor
- Decorative concrete or polishing subcontractor
- Owner’s concrete consultant
SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- 4.1. Form Facing Materials
- 4.1.1. Smooth-Formed Finished Concrete: Form-facing panels that will provide continuous, true, and smooth concrete surfaces. Furnish in largest practicable sizes to minimize number of joints.
- 4.1.2. Plywood, metal or other approved panel materials. Finish in largest practicable sizes to minimize number of joints and to conform to joint system shown on drawings. Provide form material with sufficient thickness to withstand pressure of newly-placed concrete without bow or deflection.
- 4.1.3. Design, erect, support, brace and maintain formwork to support vertical and lateral loads that might be applied until such loads can be supported by concrete structure. Construct formwork so concrete members and structures are of correct size, shape, alignment, elevation and position.
- 4.1.4. Design formwork to be readily removable without impact, shock or damage to cast-in-place concrete surfaces and adjacent materials.
- 4.1.5. Construct forms complying with ACI 347, to sizes, shapes, lines and dimensions shown, and to obtain accurate alignment, locations, grades, level and plumb work in finished structures.
- 4.1.6. Provide for openings, offsets, sinkage, keyways, recesses, moldings, rustications, reglets, chamfers, blocking, screeds, bulkheads, anchorage and inserts and other features required in work. Use selected materials to obtain required finishes. Solidly butt joints and provide back-up joints to prevent leakage of cement paste.
- 4.1.7. Chamfer exposed corners and edges as indicated, using wood, metal, PVC or rubber chamfer strip fabricate to produce uniform smooth lines and tight edge joints.
- 4.1.8. Form ties: Factory-fabricated, adjustable-length, removable or snap-off metal form ties, designed to prevent form deflection and to prevent spalling concrete surfaces upon removal.
- Unless otherwise indicated, provide ties to portion remaining within concrete after removal is at least 11⁄2” inside concrete.
- Unless otherwise shown, provide form ties which will not leave holes larger than 1” diameter in concrete surface.
- Fill all holes left from the removal of the form ties with non-shrinking 100% solids epoxy filler.
- 4.1.9. Provisions for other trades: Provide openings in concrete formwork to accommodate work of other trades. Determine size and location of openings, recesses and chases from trades providing such items. Accurately place and securely support items built into forms.
4.2. Steel Reinforcement
- 4.2.1. Reinforcing Bars: ASTM A 615, Grade 60 for #4 or less.
- 4.2.2. Plain-Steel Welded Wire Reinforcement: ASTM A185, plain, fabricated into flat sheets from as- drawn steel wire.
- 4.2.3. Supports or reinforcement: Provide supports for reinforcement including bolsters, chairs, spacers and other devices for spacing, supporting and fastening reinforcing bars in place.
- 4.2.4. Use wire bar type supports complying with CRSI recommendations, unless otherwise acceptable.
- 4.2.5. Unless otherwise noted, all concrete used in slabs, exterior and interior, shall contain reinforcing as designated on the floor slab plan.
- 4.2.6. Comply with Concrete Reinforcing Steel Institute’s recommended practice for “Placing Reinforcing Bars” for details and methods of reinforcement placement and supports, and as herein specified.
4.3. Reinforcement Accessories
- 4.3. Reinforcement Accessories
- 4.3.1. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars and welded wire reinforcement in place. Manufacture bar supports from steel wire, plastic, or precast concrete according to CRSI’s “Manual of Standard Practice,” of greater compressive strength than concrete and as follows:
- i. For concrete surfaces exposed to view where legs of wire bar supports contact forms, use CRSI Class 1 plastic-protected steel wire or CRSI Class 2 stainless-steel bar supports.
- 4.3.2. Load Transfer Dowels: For new Slab construction joints shall contain PNA diamond dowels per drawings or 24” on center if no detail is in the drawings. For a new slab cast adjacent to an existing
- slab, use PNA square dowels 18” on center if no detail is in the drawings. The portion of the dowel that will be cast into the newly placed concrete shall receive PNA Square Dowel clips per the
- drawings. Add mechanical splices and connections for steel reinforcement here if required.
4.4. Concrete Materials
- 4.4.1. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout Project:
i. Portland Cement: ASTM C 150, Type I, or Type II gray.
a. Fly Ash: ASTM C 618, Prohibited unless approved by structural engineer
- Ground Granulated Blast Furnace: ASTM C 989, Prohibited unless approved by structural engineer
- Use one brand of cement throughout project, unless otherwise acceptable to Owner.
- 4.4.2. Normal-Weight Aggregates:
ASTM C 33, Class 3S crushed coarse aggregate or better, graded. Provide aggregates from a single source.
- Crushed Coarse-Aggregate Size:
a. Slab on grade concrete: 5” and 6” slabs 1 1/2” nominal.
- 4.4.3. Water:
i. ASTM C 94/C94M and potable.
- 4.5.1. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and that will not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.
- 4.5.2. Water-Reducing Admixture:
i. ASTM C 494/C 494M, Type A, F or G. Only when approved by Structural Engineer.
4.6. Vapor Retarder (at slab)
- 4.6.1. Plastic Vapor Retarder: ASTM E 1745, Class A, permeance after conditioning less than 0.04 perms (US), membrane not less than 10 mils thick. Include manufacturer’s recommended adhesive or pressure-sensitive joint tape.
- 4.6.2. Available Products:
Stego Industries, LLC; Stego Wrap, 10 mils.
Fortifiber Corporation; Moistop Ultra 10.
Reef Industries, Inc.; Griffolyn 10 mil.
- 4.6.3. Installation: to be performed in conformance with ASTM E 1643
4.7. Sub-slab Fill Material
- 4.7.1. Material shall be a well graded crush and run material capable of being compacted to 95% of its
modified proctor or as outlined in the soils Engineer’s report. The sub base fill material shall
adequately support all construction equipment such as ready mix trucks, placing buggies and a laser screed. Materials that excessively rut such as natural gravels shall not be permitted.
4.8. Related Materials
- 4.8.1. Expansion and Isolation-Joint-Filler:
ASTM D4819 Type II 1⁄2” thick closed cell non cross- linked polyethylene foam.
5.0 READY MIX CONCRETE PRODUCTION 5.1. Quality Control Plan
- 5.1.1. The contractor will submit a quality control plan indicating how the concrete will be produced, the sources of the materials, stockpile handling procedures, personal qualifications, and procedures to be followed in the event that non- conforming concrete is produced.
- 5.1.2. The plant shall be certified by the National Ready Mix Concrete Association for operation in freezing conditions.
- 5.1.3. The Quality Control Plan submitted must detail specifically how frozen sand/coarse aggregate will be avoided in stockpile handling and production.
5.2. Concrete Mixture
- 5.2.1. Aggregate shall conform to ASTM C33, with a nominal size of up to 11⁄2 inches allowed.
- 5.2.2. Water cement ratio – 0.50 maximum.
- Strength – 3,500 psi at 28 days when tested in accordance with ASTM C31.
- Slump – shall be consistent with placement conditions and methods.
- Shrinkage – mean of 3 beams shall not exceed 0.040 percent at 28 days of drying when measured by ASTM C157, except that the curing period before drying shall be reduced to 7 days.
- Minimum flexural strength requirement of 650 psi.
6.0 FABRICATING REINFORCEMENT
- 6.1. Fabricate steel reinforcement according to CRSI’s “Manual of Standard Practice.”
7.0 FLOOR AND SLAB TREATMENTS
- 7.1. Penetrating Liquid Floor Treatment
- 7.1.1. Chemically reactive, waterborne solution of inorganic materials and proprietary components that are odorless, colorless that penetrates, hardens, and densifies concrete surfaces when applied at time of placement and finishing process.
- 7.1.2. Available Products:
i. CRMXTM Finishing Aid, by GMI www.gmiengineeredproducts.com
- 8.1. Formwork Engineered Products,1-855-755-2200
- 8.1.1. Design, erect, shore, brace, and maintain formwork, according to ACI 301, to support vertical, lateral, static, and dynamic loads, and construction loads that might be applied, until concrete structure can support such loads.
- 8.1.2. Construct formwork so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117.
- 8.1.3. Construct forms tight enough to prevent loss of concrete mortar.
- 8.1.4. Set edge forms, bulkheads, and intermediate screed strips for slabs to achieve required elevations and slopes in finished concrete surfaces. Provide and secure units to support screed strips, use strike- off templates or compacting-type screeds.
- 8.1.5. Form openings, chases, offsets, sinkage, keyways, reglets, blocking, screeds, and bulkheads required in the work. Determine sizes and locations from trades providing such items.
- 8.1.6. Build-in sleeves, anchors, inserts, bolts and other devices indicated or required. Provide sleeves 2- inches larger in diameter than piping to be sleeved, unless otherwise indicated.
- 8.1.7. Install sleeves flush with finished surfaces, install other items according to manufacturer’s
- instructions. Coordinate and build –in sleeves, thimbles, and other items furnished or set in place by
- other trades.
- 8.1.8. Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, and other debris just before placing concrete.
- 8.1.9. Retighten forms and bracing before placing concrete, as required, to prevent mortar leaks and maintain proper alignment.
- 8.1.10. Coat contact surfaces of forms with form-release agent, according to manufacturer’s written instructions, before placing reinforcement.
8.2. Vapor Retarders
- 8.2.1. Plastic vapor retarders: Place, protect, and repair vapor retarders according to ASTM E1643 and manufacturer’s written instructions.
- Lap joints 6 inches and seal with manufacturers recommended tape.
- Penetrations such as plumbing shall be installed per the manufacturer’s recommendations.
- 8.2.2. Bituminous Vapor Retarders: Place, protect, and repair vapor retarders according to manufacturer’s written instructions.
8.3. Steel Reinforcement
- 8.3.1. General: Comply with CRSI’s “Manual of Standard Practice” for placing reinforcement.
- i. Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before placing concrete.
- 8.3.2. Clean reinforcement of loose rust and mill scale, earth, ice, and other foreign materials that would reduce bond to concrete.
- 8.3.3. Accurately position, support, and secure reinforcement against displacement. Locate and support reinforcement with bar supports to maintain minimum concrete cover. Do not weld reinforcing bars.
- 8.3.4. Set wire ties with ends directed into concrete, not toward exposed concrete surfaces.
- 8.3.5. Install welded wire reinforcement in longest practicable lengths on bar supports spaced to minimize sagging. Lap edges and ends of adjoining sheets at least one mesh spacing. Offset laps of adjoining sheet widths to prevent continuous laps in either direction. Lace overlaps with wire.
- 8.4.1. General: Construct joints true to line with faces perpendicular to surface plane of concrete.
- 8.4.2. Construction Joints: Install so strength and appearance of concrete are not impaired, at locations indicated or as approved by Architect.
- 8.4.3. Contraction Joints in Slabs-on-Grade: Form weakened-plane contraction joints, sectioning concrete into areas as indicated.
- 8.4.4. Early Entry Sawed Joints: Contraction joints shall be installed with early-entry power saws equipped with shatterproof abrasive blades. Cut 1/8-inch-wide joints into concrete as soon as cutting action will not tear, abrade, or otherwise damage surface and before concrete develops random contraction cracks. Construct contraction joints for a depth equal to at least one-fourth of concrete thickness but
- no less than 1 1⁄2”. Location of control joints shall be reviewed by the floor slab subcontractor. Any alterations suggested shall be submitted to the General Contractor for review with Concrete
- Consultant and the engineer of record. Joint saver must be used where one saw-cut crosses another. The dust created by the sawing must be collected and removed from the floor’s surface as soon as possible and shall not be permitted to lay on the slab overnight.
- i. Joint spacing for a 5” slab shall be approximately 17’-0” on center. Spacing for 4” slab shall
- be approximately 12’-0” on center. Saw cut spacing will be indicated on appropriate floor
- plan drawing.
8.4.5. Isolation Joints in Slabs-on-Grade
- i. Interior column isolation shall be installed per appropriate details. Anchor bolts shall not protrude into the sales floor concrete. The perimeter of the sales floor slab on grade shall be isolated from other rigid surface with isolation materials or a bond breaker.
- 8.4.6. Dowel Joints: Install dowel sleeves and dowels or dowel bar and support assemblies at joints where indicated.
- i. Use dowel sleeves or lubricate or asphalt-coat one-half of dowel length to prevent concrete bonding to one side of joint.
8.5. Concrete Placement
- 8.5.1. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed. If utility boxes are part of the grade and fall within the scope of flatwork, grout bases 24 hours prior to flat work placement operation to ensure that these devices are not thrown out of level during the placement process.
- 8.5.2. Water addition at the site shall be in accordance with ASTM C-94. Person(s) responsible for job site water additions shall be determined at the pre slab coordination meeting. All additions of water at
- the site shall be noted on batch ticket and the concrete inspector’s ticket.
- 8.5.3. The sales floor concrete shall be placed by ready mix truck, concrete conveyor, or motorized buggy in a single placement. Initial strike off of the sales floor shall be performed with an approved ride on laser screed.
- 8.5.4. Deposit concrete continuously or in layers of such thickness that no new concrete will be placed on concrete that has hardened enough to cause seams or planes of weakness. If a section cannot be placed continuously, provide construction joints as specified. Deposit concrete to avoid segregation.
- Deposit and consolidate concrete for floors and slabs in a continuous operation, within limits of construction joints, until placement of a panel or section is complete.
- Consolidate concrete during placement operations so concrete is thoroughly worked around reinforcement and other embedded items and into corners.
- Maintain reinforcement in position on chairs during concrete placement.
- Screed slab surfaces with a straightedge and strike off to correct elevations.
- Slope surfaces uniformly to drains where required.
- Begin initial floating using bull floats or darbies to form a uniform and open-textured surface plane, free of humps or hollows, before excess moisture or bleed-water appears on the surface. Do not further disturb slab surfaces before starting finishing operations.
- 8.5.5. Cold-Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete work from physical damage or reduced strength that could be caused by frost, freezing actions, or low temperatures.
- When average high and low temperature is expected to fall below 40 deg F for three successive days, maintain delivered concrete mixture temperature within the temperature range required by ACI 301.
- Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen sub-grade or on sub-grade containing frozen materials.
- Do not use calcium chloride, salt, or other materials containing antifreeze agents or chemical accelerators unless otherwise specified and approved in mixture designs.
- 8.5.6. Hot-Weather Placement: Comply with ACI 301 and as follows:
- Maintain concrete temperature below 90 deg F at time of placement. Chilled mixing water or chopped ice may be used to control temperature, provided water equivalent of ice is calculated to total amount of mixing water. Using liquid nitrogen to cool concrete is Contractor’s option.
- Fog-spray forms, steel reinforcement, and sub grade just before placing concrete.
- Keep sub grade uniformly moist without standing water, soft spots, or dry areas.
8.6. Finishing Interior Floor Slabs to Receive Mechanical Polishing
- 8.6.1. General: Comply with ACI 302.1R recommendations for screeding, restraightening, and finishing operations for concrete surfaces. Do not wet concrete surfaces.
- 8.6.2. Trowel Finish: After bull floating the concrete surface (float finish), wait the necessary time to insure that the finish machine will not severely imprint and displace setting concrete. Install pans on finishing machine and consolidate concrete by power-driven trowel while applying a coat of
- CRMXTM Finishing Aid to the surface of the concrete in a constant and uniform application. Use sprayer delivery system on the ride-on machine. Application rate must not be less than 1,000 square
- feet per gallon. Continue pan passes in a uniformed north and south pattern and re-straighten areas out of tolerance only. Wait the necessary time until the surface has reached an adequate hardness and make a 2nd pass with pans under the finishing machine in an east/west direction until surface is
- free of heavy ridges and marks and uniform in texture and appearance adding additional CRMXTM Finishing Aid as needed. Make final passes with steel blades or combination blades with the blades positioned all the way down and not any more than 3/16” above the surface. Do not run with blades
- up! Apply final coat of CRMXTM Finishing Aid during the last finishing trowel passes. Use the CRMXTM Finishing Aid as a troweling agent and use as needed where areas of the surface are drying
- out faster. Ride on equipment that has been equipped with chemical deliver systems is approved but tanks must be washed and free of any solvents that could potentially discolor the surface or cause
- debonding issues. Final CRMXTM Finishing Aid application rate shall be no less than 500 square feet per gallon. No more than 10% of product should be left over after final application.
- 8.6.3. Within 6 hours of completion of the newly placed finishing process, CRMXTM Densifier shall be applied at proper application rates.
- 8.6.4. Machine troweled and textured (STG) finish to surfaces to be polished.
- Specified overall values of flatness, F(F) 45; and of levelness, F(L) 30; with minimum local values of flatness, F(F) 40; and of levelness, F(L) 25; for slabs-on-grade.
- Flatness and Levelness Tests must be performed by third party inspector. The testing shall be performed per ASTM E1155 and all floor flatness testing shall begin within 24 hours after completion of the finishing process. Preliminary findings must be communicated to
- the Owners’ Representative upon completion of the testing. The official report must be
- provided to the Owners’ Representative within 5 working days of the sales floor placement.
- Troweling of floor receiving diamond polish shall be done using a 10 foot ride-on power trowel on the initial passes with the pans. Combination and finish blade passes can be completed using ride-on equipment that is no less than 8 feet wide. All slab receiving polished finishes shall have a final STG of B-1.
- Walking on the slab without wearing Finishing Slicks, Shoe Ins or walking on knee boards shall not be permitted.
- The finishing process at the sales floor slab and near interior columns shall be reviewed and approved by owner or its agents.
- The application of water during finishing shall be prohibited. Edges shall receive a machine finish with either ride on trowels or walk behind edge machines. Hand finishing of edges is prohibited.
- 8.6.5. Failure to comply with the Flatness F(F) specified and Levelness F(L) specified shall result in the removal and replacement of the sales floor.
9.0 CONCRETE PROTECTING
- 9.1. General
- 9.1.1. Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with ACI 306 for cold-weather protection and ACI 305 for hot-weather protection during curing.
- 9.1.2. Slabs to be diamond polished shall only be treated with curing agents or film forming membranes that exceed ASTM C309, ASTM C1315 and ASTM C156.
- 9.1.3. Slabs to be polished shall not receive permanent protection. Localized protection in the form of temporarily placed tarps, Ram Board can be used. All protection of slabs to be polished shall be
- removed at the end of each day’s work.
- 9.1.4. No satisfactory chemical or cleaning procedure is available to remove petroleum stains from
- concrete surfaces. Prevention is therefore essential.
- 9.1.5. All hydraulic powered equipment must be diapered to avoid staining the concrete.
- 9.1.6. No trade will park vehicles on the inside slab. If parking on the inside slab is necessary to complete their scope of work, drop cloths will be placed under vehicles at all times.
- 9.1.7. No pipe fitting machine will be used on the inside slab floor.
- 9.1.8. Steel will not be placed on interior slab to avoid rust staining.
- 9.1.9. Acids and acidic detergents will not come into contact with slab.
- 9.1.10. All trades will be informed by the General Contractor that the slab must be protected during all job site meetings times.
10.0 CONCRETE SURFACE REPAIRS
- 10.1. Defective Concrete
- 10.1.1. Remove and replace concrete that cannot be repaired and patched to Owner’s satisfaction.
- 10.1.2. At the Owner’s sole discretion, repairs and patching of defective areas may be considered.
11.0 CONCRETE TESTING AND QUALITY CONTROL
- 11.1. On Site Testing
- 11.1.1. The Contractor shall have full responsibility for quality control of concrete and for demonstrating to the Owner, by standard tests, that the concrete placed in the structure complies with these Specifications. Evaluation and acceptance of concrete shall be in accordance with ACI 318-95.
- 11.1.2. The Contractor shall take whatever measures are necessary to assure concrete quality.
- 11.1.3. These measures, at the very least, shall include the hiring of a testing laboratory of established good reputation approved by the Owner to perform at least the following services:
- Each individual providing inspection services shall be certified by the American Concrete Institute as a Concrete Field Testing Technician – Grade I.
- Inspect the loading ticket for each concrete truck at the Job site. Each ticket shall include all the information required by these specifications. Reject any truck which is not properly ticketed.
- Secure production samples of materials at plant stockpiles during the course of the work and test for compliance with the Specifications.
- Before each concrete pour, verify that the batch plant operation conforms to the mix design and adjust the mix as required for aggregate moisture.
- 11.1.4. For each different mix placed, cast compression test cylinders according to the following schedule. Cast cylinders in groups of four (4). Cast each group from a different truck load (or batch) and use concrete from the middle portion of the truck load. Field mark each cylinder for identification.
- LOCATION OF CONCRETE NUMBER OF FOUR CYLINDER GROUPS REQUIRED All concrete One per 90 cubic yards placed
- 11.1.5. If the total placement in one (1) day is less than the amounts listed above, the required number four (4) cylinder groups shall be taken from the day’s placement.
- 11.1.6. Cast and cure all cylinders in accordance with ASTM Specification C31. Test cylinders in accordance with ASTM Specification C39. All slump tests shall conform to ASTM Specification C143.
- 11.1.7. For each group of cylinders, test two (2) at seven (7) days and two (2) at twenty-eight (28) days. Submit prompt written reports of these tests to the Architect, Structural Engineer, Contractor, Ready-mix Supplier and to other parties designated by the Architect.
- 11.1.8. Reports on test cylinders shall contain the standard data plus the following specific information on each:
- The identifying mark placed on the cylinder in the field. The actual measured slump of each specimen.
- The date and time of day the cylinder was molded.
- The date on which the cylinder was received by the Laboratory and placed in the required controlled environment.
- The date the cylinder was tested.
- The total cubic yards of the pour from which the cylinders were taken.
- 11.1.9. All cylinders shall be stored at the Site and shipped to the Laboratory in rigid containers. Straw or similar shock absorbing material shall be stuffed between and around each cylinder during shipment.
- 11.1.10. Any cylinder which does not comply in every respect with these Specifications shall be considered unreliable as a demonstration of the quality of the placed concrete. For each such cylinder, the Owner shall be granted a credit against the Contract Amount. The amount of credit shall be based on the Testing Laboratory’s current price schedule.
- 11.1.11. If more than two (2) cylinders from a day’s pour are considered unreliable, the Contractor shall order the Testing Laboratory to extract cores (ASTM C42) from the structure and test them to demonstrate the quality of the placed concrete. Two (2) such cores shall be taken for each unreliable cylinder.
- 11.1.12. If any material is found not to comply with these specifications, the testing laboratory shall immediately notify the Contractor that the material is rejected. If the Contractor persists in placing the rejected material into the work, the testing laboratory shall immediately notify the Architect. If a rejected batch of concrete is poured by the Contractor, the testing laboratory shall obtain a set of cylinders from the rejected batch. If the Contractor fails to cooperate with the testing laboratory, circumvents or ignores the specified testing program, the testing laboratory shall immediately notify the Architect.
- 11.1.13. Owner may hire an independent inspection company to observe the placement and finishing of the floor slab construction.
- 11.1.14. The floor slab flatness and levelness shall be measured in conformance to ASTM E 1155 within 48 hours of placement and prior to any saw cutting.
12.0 MECHANICAL CONCRETE POLISHING, PERFORMANCE BASED
- 12.1. SUMMARY
- Section Includes: Application and Installation of CRMXTM Concrete Polishing System, CRMXTM
Precision Dye Colorants (optional), Acid Blocker (stain protector) and mechanical polishing procedures of concrete floor slabs.
- 13.1. Submittal Procedure
- 13.1.1. Selected bidder or bidders are subject to perform a required mock up area on-site in a specified area of the project at Owners request for purposes of demonstrating the ability to comply with the specified finish. The mock up process will be the determining factor for selecting or qualifying the subcontractor that will be performing the concrete polishing scope work.
- 13.1.2. Products to be used during the mock-up process:
- Diamond Abrasive Tools: CRMXTM Prep Zone
- Non Diamond Abrasive Tools: CRMXTM Polishing System
- Grouting System: CRMXTM Grouting Agent
- Chemical Mechanical Polishing (CMP) Agent: CRMXTM Surface Refining Agent
- Densifier: CRMXTM Densifier
- Stain Protector: CRMXTM Acid Blocker
- Cleaner: CRMXTM Polished Concrete Floor Cleaner
14.0 EQUIPMENT FOR POLISHING CONCRETE
- 14.1. Floor Grinder
- 14.1.1. Submit product data for polishing equipment prior to beginning polishing operations. Equipment utilized must be in good operational condition and working order during the project. Any equipment that requires more than a minor repair taking longer than 1 hour will need to be removed from the job site and replaced with an equally size unit in good working order. For any reason the contractor
- can’t comply with the equipment requirements, units will be rented at the owner’s expense and
- charged back to the performing contractor. All equipment must be capable of operating tools on a rigid and flexible drive head system in order to comply with this specification. Subcontractor awarded the concrete polishing scope work must have at minimum 2 grinding/polishing units that
- are minimum 30” grinding width and adequate/competent staff to coordinate simultaneous polishing
- operations on site at all times until polishing scope work is completed.
- 14.1.2. Field Grinding and Polishing Equipment: A multiple head, counter rotating, walk-behind or ride-on machine, of various size and weights, with abrasive tools affixed to the head for the purpose of grinding concrete.
- 14.1.3. Use equipment capable of removing dust generated from dry grinding, honing or polishing.
- 14.2. Vacuum/Extraction Systems for Floor Grinder
- 14.2.1. Use equipment capable of slurry extraction and containment for wet grinding, honing or polishing.
- 14.2.2. Concrete grinder vacuums must comply with OSHA indoor air quality standards and silica exposure limits to ensure the air quality safety of other trades occupying the work space. Any vacuum that
- can’t operate within the standards outlined by OSHA must immediately be removed from the premises and replaced with units that are within compliance. Absolutely no exceptions.
- 14.3. Automatic Floor Scrubber Machines
- 14.3.1. Scrubber Machines Equipment used for cleaning operations shall have a head pressure sufficient to produce the specified results.
- 14.3.2. Hard or stiff nylon/metal brushes are prohibited from being used during the polishing operation. Soft brushes and/or nylon pads are permitted only.
15.0 APPLICATOR QUALIFICATIONS
- 15.1. Certifications and Requirements
- 15.1.1. Provide documentation showing CRMXTM densifier and stain protector applicator is certified by the densifier and stain protector manufacturer.
- 15.1.2. Provide CSDA certification showing that all equipment operators have been properly trained to competently use a T Meter and STG (Surface Texture Grades) and have taken a concrete texturing class outlined by the CSDA Polishing Committee.
- 15.1.3. Provide list of a minimum of 5 projects performed within the last 3 years of similar type, size and complexity as this contract. Submit 30 days prior to first concrete placement.
- 15.1.4. Owner and its consultants reserve the right to approve or disqualify polishing subcontractors.
- 15.1.5. Provide name of CRMXTM technical representative and/or CRMXTM distributor representative.
16.0 PRODUCTS, APPLICATION RATES, AND MANUFACTURERS
- 16.1. General
- 16.1.1. The water absorption of a concrete surface depends on many factors including: concrete mixture proportions, the presence of chemical admixtures and supplementary cementitious materials, the composition and physical characteristics of the cementitious component and of the aggregates, the entrained air content, the type and duration of curing, the degree of hydration or age, the presence of micro cracks, the presence of surface treatments such as sealers or form oil, placement method including consolidation and finishing. Water absorption is also strongly affected by the moisture
- condition of the concrete at the time of testing. All CRMXTM Polishing System Chemicals must be applied at the surface to the point of rejection to ensure that the required amount of products were
- properly applied.
- CRMXTM Surface Refining Agent, A chemical containing a non-fixed abrasive to be used in conjunction with a series of honing and refinement tools to produce a scratch free
- concrete surface.
- CRMXTM Grouting Agent, A chemical used for filling concrete substrates that are severely pitted and crazed. The grouting agent additive when mixed with the slurry, has exceptional
- adhesion capabilities and is driven into the surface of the concrete with the unique
- CRMXTM tool that will change the color of the slurry to dark grey when it is in the presence
- of calcium hydroxide, ensuring that the patching material matches the color of the majority of the concrete matrix.
- CRMXTM Densifier, Concrete chemical densifier specifically for concrete surface treatment which reacts chemically to the concrete surface forming a clear, dense, durable,
- hard, abrasion-resistant surface.
- CRMXTM Acid Blocker, a penetrating stain protector specifically for concrete surface
- treatment which reacts chemically to the concrete surface that neutralizes the pH of accidental spills of agents that are inherently high in pH content, maintaining a clear, dense, durable, hard, abrasion- and chemical-resistant surface.
- CRMXTM Polished Concrete Floor Cleaner, a uniquely blended formulation of pH neutral cleaner containing generation 5 quaternary ammonia. CRMXTM Floor Cleaner administers
- a continual dispersion of densification at every cleaning that will disperse a chemical hardener at every cleaning while removing micro abrasion at the surface of the concrete caused from heavy traffic and tracking in contamination from other areas and outdoors.
- CRMXTM Joint Filler, 2 component, flexible, Polyurea high solids epoxy for filling control saw cuts and expansion joints
- CRMXTM Epoxy Grout Filler, 2 component, high solids epoxy for filling larger damaged areas in the surface of the concrete exceeding 3/16” in diameter. Epoxy filler can be mixed
- with sand to add body and provide additional strength.
- CRMXTM Precision Dye, Single component nano ink used for coloring post placed concrete slabs. Extremely versatile material with the ability to be deployed with multiple
- carriers. Best results achieved when mixed with water.
- 16.2. Application Rates
- 16.2.1. CRMXTM 3 Step Concrete Polishing System
- CRMXTM Surface Refining Agent, Component of CRMXTM 3 Step Concrete Polishing
- System 500 square feet per gallon
- CRMXTM Densifier, Component of CRMXTM 3 Step Concrete Polishing System 500 square feet per gallon
- CRMXTM Acid Blocker, Component of CRMXTM 3 Step Concrete Polishing System 1,000 square feet per gallon
- CRMXTM Polished Concrete Floor Cleaner, Component of CRMXTM Concrete Maintenance System, 1 ounce of concentrated liquid to 1 gallon of clean potable water
- CRMXTM Precision Dye, 400 square feet per gallon
- 16.3. Delivery, Storage, and Handling
- 16.3.1. Delivery
- i. Deliver materials to site in manufacturer’s original, unopened containers and packaging, with labels clearly identifying product name and manufacturer.
- 16.3.2. Storage
- Store materials in clean, dry area indoors in accordance with manufacturer’s instructions.
- Keep materials from freezing.
- SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- 16.3.3. Handling
i. Protect materials during handling and application to prevent contamination or damage.
- 16.4. Manufacturers
- 16.4.1. CRMXTM Polishing System, GMI Engineered Products, 3600 Twp. Rd. 27; Bluffton, OH 45817, (855) 755-2200 see website for list of approved distributors www.gmiengineeredproducts.com
- 16.4.2. Joint Filler, GMI Engineered Products, 3600 Twp. Rd. 27; Bluffton, OH 45817 (855) 755-2200 see website for list of approved distributors www.gmiengineeredproducts.com
- 16.4.3. Cleaning and Maintenance Products, GMI Engineered Products, 3600 Twp. Rd. 27; Bluffton, OH 45817 (855) 755-2200 see website for list of approved distributors www.gmiengineeredproducts.com
- 16.4.4. CRMXTM Precision Dye, GMI Engineered Products, 3600 Twp. Rd. 27, Bluffton, OH 45817, (855) 755-2200 see website for list of approved distributors at www.gmiengineeredproducts.com
17.0 QUALITY ASSURANCE
- 17.1. Coordination
- 17.1.1. Coordinate CRMXTM Polishing System with work of other sections and trades.
- 17.1.2. Sequence with Other Work: Coordinate application of CRMXTM Polishing System with concrete
- placement contractor.
- 17.2. Pre installation Meetings
- 17.2.1. Conduct pre installation meeting to verify project requirements, manufacturer’s installation instructions and manufacturer’s warranty requirements as applicable.
- 17.3. Field Mock-up
- 17.3.1. Before performing work of this Section, provide [10 feet by 10 feet] field mock-up in area selected by Owner to verify selections made under submittals. Mock-up conditions to match proposed scope
- of work including application of CRMXTM Polishing System. Obtain written approval from Owner
- prior to start of work. Approval does not constitute approval of deviations from Contract Documents, unless such deviations are approved by Architect in writing. Approved mock-up will become part of the completed work to ensure that the selected polishing process/appearance is fully executed when scope work is completed. Main scope work must be finished back into the approved mock up sample area. The following information will be determined via the mock-up process:
- The initial starting CRMXTM Prep Zone Tool required to provide the desired level of aggregate exposure.
- Potential spalling repair methods.
- Whether the entire polished area will be grout coated with CRMXTM Grouting Agent and what type; cementitious or epoxy
- iv. Products shall comply with the United States Clean Air Act for maximum Volatile Organic Compound (VOC) content and/or the local jurisdiction having authority.
- 17.3.2. A technically qualified manufacturer’s field representative of the CRMXTM Polishing System shall be on site during the initial installation and occasional observations during remainder of the project. The CRMXTM authorized representative shall ensure that the correct amount of product is onsite and in numbered containers prior to commencement of work.
- 18.1. Field Conditions
- 18.1.1. Prohibit and/or protect surface from any operations, chemicals and/or any other activities over concrete that could damage surface.
- 18.1.2. All wheeled vehicular equipment must be diapered and have non-marking tires.
- 18.2. Environmental Requirements
- 18.2.1. Comply with manufacturer’s written instructions for substrate temperature, ambient temperature, moisture, ventilation.
- 18.2.2. Work shall not commence until the building is enclosed and in a water tight condition.
- 18.2.3. Limit and control damage from moisture. Remove standing water from floor prior to and after
- CRMXTM Polishing System installation, immediately after the curing process.
- 18.3. Floor Cleaning Prior to CRMXTM Polishing System Installation
- 18.3.1. The use of brooms to clean dust without sweeping compounds is prohibited. Green sweeping compounds that do not contain high levels of resin are approved. Red resin (oil based) sweeping compounds can leave a residue on the surface that will need to be removed prior to installing the
- CRMXTM Polishing System. Squeegees, mops and automatic scrubber machines are acceptable. Use pads with automatic scrubber machine and soft nylon brushes with pH neutral detergents and
- degreasers. Steel brushes and/or pads are prohibited.
- 18.4. Vapor Testing Concrete Floors
- 18.4.1. In high moisture environments, testing for alkalinity is recommended. (When applicable or required by manufacturer before Precision DyeTM application)
- 18.4.2. Test Method and Requirements
- Measure PH according to method indicated in ASTM F 710.
- Perform anhydrous calcium chloride test according to ASTM F 1869.
- Comply with manufacturer’s acceptable application limits.
- Provide Moisture Vapor Transmission Rates and pH levels in each corresponding zone.
- 1 test for every 2500 square feet
- If project is smaller than 2500 total square feet then, 1 test for every 500 square feet.
- c. Comply with manufacturer’s acceptable application limits.
- v. Relative humidity probes and testing
- Only when requested by manufacturer
- When Relative Humidity (RH) testing is required, perform relative humidity test using in-situ probes according to ASTM F 2170.
- Comply with manufacturer’s acceptable application limits.
- 18.5. Authorization to Proceed
- 18.5.1. During the subcontractor selection/bidding process the successful polishing contractor prepared an area for review and approval. The mock-up was completed, approved, and a clear scope of work was determined to successfully manage the expectation of the building owner.
- 18.5.2. The actual project scope polishing work shall be completed by the individual workers who completed the approved mock-up area; this includes edges and edge polishing techniques.
- 18.5.3. Obtain written approval from the mock-up selection process from owner before the commencement of work.
- 18.5.4. Retain approved mockup through completion of the Work for use as a quality standard for finished work. Approved mock-up will become part of the completed project. All necessary measures shall be taken to protect the approved mock-up sample as this is now the responsibility of the selected polishing subcontractor.
- 18.5.5. The following information was determined via the mock up process:
- Proper CRMXTM Prep Zone and CRMXTM Prep Zone tool to begin the project.
- Joint filler
- CRMXTM Grouting Agent or
- CRMXTM Epoxy Grout Filler
- Spall repair
- Precision Dye (if color is desired)
- Joint Filler
- 18.6. Polishing Procedure (Performance Based)
- 18.6.1. Newly placed concrete shall be sufficiently cured for a minimum of 7 days prior to the commencement of the CRMXTM Polishing System.
- 18.6.2. Do not use liquid curing materials that impede chemical/densifier penetration such as non- dissipative sodium silicates.
- 18.6.3. If a CRMXTM Prep Zone Tool is required to remove an existing coating or floor finish (old adhesive or paint) before the polishing process begins, select the appropriate preparation zone from the CRMXTM Complete Polishing System Process Sheet. This was determined during the approved mock-up process.
- 18.6.4. All polishing steps shall be included both in the sales floor areas as well as all edges. Note that sequencing steps that were approved during the mock up is the approved process for the main project. Alternate methods/sequencing steps or equipment substitutions are not permitted. Measure the areas to be polished with the T Meter in various areas throughout the entire space to determine the proper starting tool. If the T Meter readings are a cumulative average of 100 Ra and higher,
- begin with the CRMXTM Step 1 tool. If the T Meter cumulative average is 100 or less, begin with
- the CRMXTM Step 2 tool. If a cream only polish is desired by the owner, start all floors with the
- CRMXTM Step 2 tool. Floor texture and flatness was honored during the placement and finishing process in this performance specification and any aggressive means of grinding will expose various levels of sand/aggregate, which can’t be changed once the concrete is cured. The mock up that was approved is the determining criteria for the polishing process and will be strictly followed.
- 18.6.5. Fill control and isolation joints per section 033170 before initial CRMXTM grinding steps begin.
- Joint filler must also be same as approved in the mock up area. No substitutions or alternates are accepted after the mock up approval process. Trim excessive joint filler residing above the surface of the concrete maintaining a fresh razor blade that will ensure a clean cut and not pull the applied joint filler up and create sagging. Any joint filler that is identified as sagging or separating will be replaced before project completion. NOTE: Best practices for joint filling is to do 2 applications. The first application, fill joint filler up to 60% of the joint only on the first application. This will reduce the risk of settling and allow the 2nd application to be applied without settling. Backer rods and sand are approved but drawings for this process must be submitted during the submittal and approval process.
- 18.6.6. Select first qualifying tool by Ra measurement and operate the tool until maximum refinement is achieved for that specific tool on the surface by the T Meter Ra measurement. It is a requirement
- that all tools in the CRMXTM Polishing System must be ran in both; north/south AND east/west direction to avoid corn rowing or possible lines in the concrete surface.
- 18.6.7. After running CRMXTM Step 1 Tool, measure the surface in the designated sample zone to ensure
- that the maximum refinement was achieved with the tool. This audit will eliminate the possibility of the operator walking too fast with the machine and/or determine if a grout coat will need to be installed before proceeding. If the proper Ra numbers were achieved in the polished areas, clean
- floor thoroughly and proceed with the CRMXTM Step 2 tool. Do not proceed with the CRMXTM
- Step 2 tool if the cumulative average is greater than 100. If the cumulative average Ra is equal to or greater than 100 Ra, clean floor thoroughly in its entirety and select the appropriate grouting agent (epoxy or cementitious). If surface damage is less than 50 Ra, make preparations to begin the installation of the cementitious grouting agent and if the surface damage is greater than 50 Ra, make preparations to begin the installation of the epoxy grouting agent. See example for determining surface damage below. Illustration 1
- 18.6.8. Cementitious Grout Filler Procedure:
- Apply CRMXTM Grouting Agent to floor surface at a rate no less than 500 square feet per gallon.
- Broom the CRMXTM Grouting Agent into the surface while applying an equal amount of clean, potable water with a pump sprayer at a rate not to exceed 500 square feet per gallon. Begin running the CRMXTM Step 1 tool into the applied CRMXTM Grouting Agent and continue to run until the surface is completely dry. After sufficient grouting system cure, proceed to the next step in the CRMXTM Polishing System (CRMXTM Step 2).
- 18.6.9. Epoxy Grout Filler Procedure:
- Mix CRMXTM Grouting Agent per manufacturer’s instructions and apply mixed material with an
- 18” flat, steel trowel, forcing the mixed grouting agent into the surface of the concrete. Stand up trowels are not approved because they do not force the material into the surface to and adequate or ample depth of penetration. After grouting agent has sufficiently dried per manufacturer’s
- recommendations, proceed to the next step by running the CRMXTM Step 2 tool. Note: If concrete
- stain is specified, do not refine the surface lower than a 40 Ra before application of color and/or densifier or both. Follow specific color, densifier and tool manufacturer instructions for specific tooling grits for proper chemical applications.
- After running the CRMXTM Step 1 tool, a simple mathematical calculation will determine the exact damage at the surface of the concrete that the sum will represent the severity of inclusions and other damage that prevents concrete surfaces from a complete polished finish. Below is an example of the mathematical equation for proper grouting system selection. Damage equal to and less than 50 Ra will only require the CRMXTM Grouting Agent. Damage greater than 50 Ra will require the CRMXTM Epoxy Grout Filler.
- EXAMPLE #1
Certified CRMXTM Step 1 Ra 100
- Average Ra #5 Zone Reading -127 Sum= -27 =
- EXAMPLE #2
Certified CRMXTM Step 1 Ra 100
- Average Ra #5 Zone Reading -163 Sum= -63 =
- Illustration 1
- CRMXTM Grouting Agent
- CRMXTM Epoxy Grout Filler
- 18.6.10. Run the CRMXTM Step 2 tool no greater than 600 RPM’s in a north/south, east/west direction at the proper rate of travel to ensure that the maximum refinement of 40 Ra or better is achieved. If the grout coating application was required, run the CRMXTM Step 2 tool for the necessary time to ensure
- that 100% of the filling agent is removed that resided at the surface above the mean line of the concrete. Epoxy coatings and residue that reside in the texture of the concrete surface are not approved and will cause final Ra readings to be disqualified. Contamination such as epoxy residue, paint, oil, polish guards, are defined and classified as performance enhancing products that reside above the surface of the concrete and will not be present during the final texture readings with the T Meter. After proper stain and densification steps, continue operating the final resin bonded tools in order to comply with the specified A-3, STG. Thoroughly clean the concrete surface before
- applying the CRMXTM Densifier. Note: Follow guidelines for sampling areas and taking the necessary amount of STG, Ra readings and recording these readings on the floor plan drawings with
- the proper designation codes are defined in CSDA ST115 Standard.
- 18.6.11. After the required Ra was achieved post CRMXTM Step 2 tool operation and the floor was
- thoroughly cleaned with an auto scrubber, the densification process can begin. If color was selected by the owner, apply the mixed colorant with the desired carrier (water, acetone, and mineral spirits) and apply the colorant to the concrete surface using a HVLP pump style sprayer/delivery system and distribute product in a even and uniform single coat. Ensure that a sufficient amount of products was applied by adhering to the manufacturers recommended application rate. Allow product to completely dry and run auto scrubber again to remove excessive colorant that did not penetrate the
- concrete. Apply the CRMXTM Densifier to the clean, colored or non-colored surface at the
- manufacturers recommended application rate. Allow the concrete surface to completely dry before proceeding. Completely clean the grinding machines from any concrete residue and also allow the machines to be completely dry before proceeding.
- SECTIONS 03 3000, 03 3500, 03 3540, 03 3550
- Run auto scrubber once again and clean concrete surface completely by removing any densifier that did not penetrate into the surface of the concrete. Run the CRMXTM Step 3 tool in a north/south,
- east/west direction not to exceed 1200 RPM’s. After the completion of the CRMXTM Step 2 tool process, run auto scrubber to remove any residue from the surface of the concrete in its entirety with the CRMXTM maintenance pads. Substitutions for the auto scrubber pads/burnisher pads are not permitted. Diamond impregnated pads will damage the surface of the concrete and leave scratched in the surface that will require the CRMXTM Step 2 tool for removal. Burnish the floor with the
- CRMXTM Grey maintenance burnisher pad on a high speed floor burnisher with a minimum 2000 rpm’s.
- Apply CRMXTM Acid Blocker at the manufacturers recommended application rates. DO NOT
- OVER APPLY! CRMXTM Acid Blocker is a penetrating product and is not intended to be used as a coating like typical polish guards. Any areas where excessive material has been applied will need to be removed using the CRMXTM Step 2 tool. Performance enhancing coatings and polish guards
- do not have the ability to withstand abrasion caused from normal foot traffic over long periods of time and do not qualify as approved products to be used in a mechanically polished cement/concrete or natural stone polishing system.
- Begin normal prescribed CRMXTM maintenance routine immediately in accordance with the strictly specified chemicals and maintenance pads. Substitutions are not permitted and will void any warranties associated with the CRMXTM Polished Concrete System.
- Documentation and Data Recording
- Record final texture readings in the designated testing areas and document the readings on the appropriate floor plan drawings and the texture audit software and submit the final data to the owner
- or owners’ rep for final approval.
19.0 FINISH REQUIREMENTS
- 19.1. Slip Resistance Testing
- 19.1.1. Measured static coefficient of friction (SCOF) ASTM C 1028 (withdrawn standard)
- 19.1.2. This section has been deleted in its entirety. This ASTM Standard has been withdrawn from the ASTM library of standards without replacement due to its limited use in the industry. If a slip resistance requirement is requested by the owner or architect, follow the current procedure included in the NFSI (National Floor Safety Institute) policy and procedure manual.
- 19.2. Warranty
- 19.2.1. Provide CRMXTM written warranty of CRMXTM Polishing System and products. 19.3. Floor Protection
- 19.3.1. Protect finished floor from construction traffic and weather until time of Owner Possession.
- 19.3.2. Prohibit caustic chemicals and materials, acids and acidic detergents to come in contact with slab.
- 19.4. Product Disposal
- 19.4.1. Upon completion of CRMXTM Polishing System, dispose of excess material and comply as required by local agency having jurisdiction.
- 19.4.2. Certified CRMXTM technician shall remove CRMXTM Polishing System chemicals and containers from job site immediately upon completion of treatment.
- 19.4.3. Certified CRMXTM technician shall remove all concrete dust and slurry debris.
20.0 MAINTAINANING MECHANICALLY POLISHED CONCRETE FLOORING
- 20.1. Maintenance Products
- 20.1.1. CRMXTM Polished Concrete Floor Cleaner by GMI Engineered Products
- 20.1.2. CRMXTM Daily Scrub Pad, sizes 17” and 20” by GMI Engineered Products
- 20.1.3. CRMXTM Buff Pad, sizes 20” and 27” by GMI Engineered Products
- 20.2. Execution
- 20.2.1. Maintaining a previously mechanically polished concrete floor and determining the frequency of cleaning based upon beginning Ra and the desired Ra of sustainability.
- 20.2.2. Reference the CRMXTM Polished Concrete Warranty, Care and Maintenance booklet to begin the proper sustainable polished concrete floor cleaning system.
A man named John Ruskin once said:
“It’s unwise to pay too much, but it’s worse to pay too little. When you pay too much, you lose a little money, that’s all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do. The common law of business balance prohibits paying a little and getting a lot – it can’t be done. If you deal with the lowest bidder, it is well to add something for the risk you run, and if you do that you will have enough to pay for something better.”
Lord Kelvin (1824 – 1907)
“In physical science the first essential step in the direction of learning any subject is to find principles of numerical reckoning and practicable methods for measuring some quality connected with it. I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be.” -Lord Kelvin
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