Radha Krishna Temple Construction
CAST-IN-PLACE CONCRETE SPECIFICATIONS
SECTION 033000 - CAST-IN-PLACE CONCRETE
PART 1 GENERAL
1. Demolition of sections of existing 4" thick slab-on-grade as determined and demarcated by Plumbing Contractor to run underground plumbing line.
2. Reinstall Slab on grade in demolished sections of kitchen expansion area and any area related to required kitchen expansion modifications as denoted by Plumbing Contractor:
a) Repour cut out sections of Slab on Grade following project specifications.
b) Slab thickness to match existing with 4" Thickness
c) Compressive strength of concrete for new slab after curing shall be 4100 psi.
b) with 16" OC Grade 60 rebar crossing perpendicular in both directions
c) #4 Dowels 10" min. length at joints Grade 60, use keyways as necessary to integrate existing and new slab.
d) Over 10 mil vapor barrier over compacted granular fill
e) Contractor shall be familiar with existing foundation design (S-1.0 from Original Building Plans) including location of piers and grade beam below slab before beginning any work.
3. Demolish and Reinstall Concrete as Required for Grease Trap modification and/or New Installation
B. Related Sections:
1. Section 031100 - Concrete Forming
2. Section 032100 - Reinforcing Steel
3. Section 055000 - Metal Fabrications: Foundation vent.
4. Section 071 326 - Fully Bonded Sheet Membrane Waterproofing
5. Section 079200 - Joint Sealants: Traffic sealants.
6. Section 089110 - Louvers: Foundation vents.
7. Section 321613 - Concrete Curb Sidewalks.
1 .2 REFERENCES
A. Reference Standards: Most current edition at date of Bid.
B. American Association of State Highway and Transportation Officials (AASHTO)
1. AASHTO T26 - Method of Test for Quality of Water to be Used in Concrete.
C. American Concrete Institute (ACI):
1. ACI 11 7 Standard Tolerances for Concrete Construction and Materials.
2. ACI 301 Standard Specifications for Structural Concrete.
3. ACI 302.1 R- Guide for Concrete Floor and Slab Construction.
4. ACI 303R - Guide for Cast-In-Place Architectural Concrete Practice.
5. ACI 304R - Guide for Measuring, Mixing, Transporting, and Placing Concrete.
6. ACI 304.2R- Placing Concrete by Pumping Methods.
7. ACI 305R - Hot Weather Concreting.
8. ACI 306R - Cold Weather Concreting.
9. ACI 306. l - Standard Specification for Cold Weather Concreting.
10. ACI 308 Standard Practice for Curing Concrete.
11. ACI 309R - Guide for Consolidation of Concrete.
12. ACI 31 8 Building Code Requirements for Reinforced Concrete.
13. ACI 347 Guide for Concrete Formwork.
D. ASTM International (ASTM):
1. ASTM C31- Practice for Making and Curing Concrete Test Specimens in the Field.
2. ASTM C33 - Specification for Concrete Aggregates
3. ASTM C39 - Test Method for Compressive Strength of Cylindrical Concrete Speciments
4. ASTM C94 - Specification for Ready-Mixed Concrete
5. ASTM C109 - Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-Inch (or 50mm) Cube Specimens)
6. ASTM C143 - Test Method for Slump of Portland Cement Concrete
7. ASTM C150 - Specifications for Portland Cement
8. ASTM C157 - Test Method for Slump of Portland Cement Concrete
9. ASTM C171 - Standard Test Method for Length of Change of Hardened Hydraulic-Cement Mortar and Concrete
10. ASTMC172-Standard Practice for Sampling Fresh Concrete
11. ASTM C23 l - Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method
12. ASTM C260 - Specification for Air-Entraining Admixtures for Concrete
13. ASTM C494 - Specifications for Chemical Admixtures for Concrete
14. ASTM C618 - Specifications for Coal Fly Ash and Raw or Calcinated Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete
15. ASTM C642 - Standard Test Method for Density, Absorption and Voids in Hardened Concrete
16. ASTM C939 - Standard Test Method for Flow of Grout for Prepared-Aggregate Concrete - Flow Cone Method
17. ASTM Cl 042 -Standard Test Method for Bond Strenth of Latex Systems Used with Concrete by Slant Shear
18. ASTM Cl 059 -Standard Specification for Latex Agents for Bonding Fresh to Hardened Concrete
19. ASTM Cl l 07 - Standard Specifications for Packaged Dry, Hydraulic Cement Grout (non shrink)
20. ASTM Cl 116 - Standard Specifications for Fiber-Reinforced Concrete and Shotcrete
21 . ASTM C 1 3 1 5 - Standard Specification for Liquid Membrane-Forming Compounds Having Special Properties for Curing and Sealing Concrete
22. ASTM Cl 602 - Standard Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete
23. ASTM C 1603 - Standard Test Method for Measurement of Solids in Water
24. ASTM Dl751 - Standard Specification for Preformed Expansion Joint Filler for paving and Structural Construction (nonextruding and resilient bituminous types)
25. ASTM D2240 -Standard Test Method for Rubber Property - Durometer Hardness
26. ASTM El 155 - Standard Test Method for Determining FF Floor Flatness and FL Floor Hardness Levelness Numbers
A. Submit under provisions of Section 013310.
B. Shop Drawings: Submit concrete placement procedures and plan drawings showing locations of isolation joints, contraction (control) joints, and construction joints for slab-on-grade concrete.
C. Mix Designs: Sign by batch plant quality control engineer or responsible agent for each design. Include for each mix design:
1. Method and test data used to establish mix proportions.
a. Include supporting test records for field experience method or trial batch method
for each mix design.
b. Include date of test and batch plant location.
2. Concrete compressive strengths.
3. Water/ cement ratios, corresponding cement content, and water content.
4. Linear shrinkage. Mix designs with no test data may substitute shrinkage reducing
admixture in proportions conforming to manufacturer's instructions.
5. Admixtures and additives.
6. Slump or slump flow.
7. Hot and cold weather designs.
8. Air entrainment for each design.
9. Ingredients, proportions, and source of materials.
10. Location and intended use.
D. Product Data: Submit manufacturer's printed data and instructions for proprietary products and equipment, including for:
1. Admixtures and additives.
2. Bonding agents.
3. Screeding products and equipment.
4. Curing materials and methods.
5. Joint systems.
E. Procedures: Written procedures and drawings describing work, including for.
1. Concrete curing.
2. Saw cutting of contraction joints and construction joints.
3. Crack repair.
F. Certification: Written and signed by batch plant quality control engineer or responsible agent. Certify that mix design conforms to provisions of this Section and that ingredients for each mix design are compatible.
G. Samples: Joint filler materials.
H. Qualification Data: For testing agency.
1.4 QUALITY ASSURANCE
A. Moisture Content and Alkalinity Requirements for Concrete Slab:
1. Take measures to control concrete mix design water content, placement, curing, and other procedures as necessary to achieve acceptable moisture and alkalinity content within time period scheduled for installation of finish flooring systems specified under other Sections.
2. Conduct testing as specified under PART 3 of this Section under Field Quality Controltesting for concrete slabs. Do not begin testing until after building envelope is fully
enclosed and ambient temperature and humidity approximate final interior conditions.
3. Following initial curing period, take necessary measures to control temperature and humidity levels and to remove moisture through ventilation to outside of building.
B. Concrete Mix Design:
1. Do not change brands and sources of cement, aggregates, admixtures, and additives during course of construction.
2. Supply mix design from same batch plant, using same source for mix ingredients, as submitted for supporting test data.
3. As basis for acceptance, submit new mix design from batch plant indicating that shrinkage, cracking, strength, and other properties are compatible with original mix
A. Installers / Applicators: Company specializing in work of this Section with minimum 3 year documented ex perience in commercial quality work of comparable scope and quality.
B. Applicators for Semi-Rigid Epoxy and PolyureaJoint Sealers and ElastomericJoint Sealants and Other Specialized Systems: Trained and authorized by manufacturer as qualified prior to Bid Date, or accepted by Engineer.
1.6 REGULATORY REQUIREMENTS
A. Conform to Regulatory Requirements specified by Division 01 requirements.
B. Testing and Special Inspections: As indicated on the Structural Drawings for Requirements.
1. 7 DELIVERY, STORAGE, AND HANDLING
A. Conform to provisions of Division 01 and manufacturer's instructions.
B. Mixing and Delivery: Conform to ASTM C94.
C. Sampling at Delivery: Conform to ASTM Cl 72. Cure 4 inch by 8 inch cylinders to provisions of ASTM C3 l and compression test compressive strength of cylinders to ASTM C39.
D. Batch Tickets: Conform to ASTM C94 Option A or C. Accompany with each load, fully executed, and signed. Log in with inspector at time of entry. Conform to Source Quality Control requirements specified by this Section.
1. Include water content and water withheld at batch plant.
2. Indicate time to nearest minute that batch was dispatched from plant, when it arrived at site, and when unloading began and was finished.
3. Indicate ambient air temperature and concrete internal temperature of at time of arrival.
4. Make written record of water and other additives added to design mix following time that mix truck has left batch plant.
E. Reject concrete that has reached internal temperature of 89 degree F or above and when temperature has risen 5 degrees in 1 0 minutes, indicating that concrete is setting up prior to discharge.
F. Store products in accordance to ACI 301. Do not use admixtures that have been in storage at project site for more than 6 months or which have subject to freezing.
1.8 PROJECT CONDITIONS
A. Environmental Conditions: Conform to ACI 301, 5.3.2 for placement of concrete weather considerations. Do not place concrete during falling rain, sleet, or snow.
PART 2 PRODUCTS
A. Substitution Requests to Specified Products: Comply with provisions of Section 006000.
2. 2 MATERIALS
A. Portland Cement: ASTM Cl 50.
1. Interior: Type I and Type II.
2. Exterior: Type I with specified air entrainment admixture, preferred to Type IA and Type llA air-entrained concrete.
1. Fine and Coarse Aggregate Grading and Quality: ASTM C33.
2. Coarse Aggregate Class Designation: As indicated by Table 3 for Type or Location of concrete for Moderate Weathering Region, including SM for exterior Architectural
3. Size: Do not exceed 3/ 4 distance between reinforcing steel.
4. Free of deleterious substances that may cause expansion of concrete or react with alkalis in concrete.
C. Sand: Washed, ASTM C33.
D. Mix Water: Conform and test to ASTM Cl 602.
1. Recycled mix water conform to and tested to ASTM Cl 603 for maximum permitted solids of 50,000 parts per million, or 5 percent, of total mix water.
a. Wash water from mixer washouts or as part of a concrete mix.
b. Water collected in a basin as a result of storm water runoff at a concrete production facility. Site water, water from truck exterior, and undocumented water
is not permitted to enter containment system.
2. Clean water free from acids, alkalis, organic material, minerals, salts, and other deleterious materials. Seawater not accepted.
2.3 ADMIXTURES, AGENTS, AND COMPOUNDS
1. Provide products from single manufacture, or supply manufacturer certification that admixtures are compatible in combination with cement and aggregates.
2. Free of calcium chloride and thiocyanate. Containing no more than 0.05 percent chloride ions.
B. Air-Entraining Agent: ASTM C260 for exterior concrete.
1. Master Builders, AE 90 or Micro-Air.
2. WR Grace, Daravair 1000.
3. Euclid, Air Mix.
1. High range water-reducing admixture, ASTM C494, Type F.
a. Master Builders, Rheobuild 3000FC.
b. Grace, Advaflow or ADVA 100.
c. Euclid, Eucon 37.
2. Mid range water-reducing admixture, ASTM C494, Type A or F.
a. Master Builders, Polyheed.
b. Grace, Daracem.
c. Euclid, Eucon MR
3. Low range water-reducing admixture, ASTM C494, Type A.
a. Master Builders, Pozzolith.
b. Grace WRDA 64.
c. Euclid A+.
2.4 BONDING AGENTS
A. Bonding Agents: ASTM Cl 059 Type II and ASTM Cl 042 Type II acrylic emulsion designed to permanently bond new concrete and Portland cement sand mixes to horizontal and vertical in-place concrete at interior and exterior conditions.
1 . W.R. Grace, Daraweld C.
2. Larsen Products Corp., Weldcrete.
3. L&M Construction Chemicals, Inc, Everbond.
4. Euclid, Flex-Con.
5. Vexcon, Envirostrong.
6. US MIX, US SPEC Acrylcoat.
7. Edoco Burke, Acrylic Bondcrete
B. Epoxy Bonding Agent for Below Grade Applications.
1. WR Meadows, lntralock.
2. US MIX, US SPEC Multicoat.
2.5 POST INSTALLED (ADHESIVE) ANCHOR SYSTEMS
A. As specified on the Structural Drawings
A. Adhesive Epoxy Grout: Shear and Tensile Bond Strength: Greater than hardened concrete strength conforming to ASTM C882. Compatible for use with damp concrete.
B. Non-Shrink Grout under Structural Base Plates and General Use:
1. Natural aggregate, ASTM Cl 107 Grade C, tested 25 to 30 seconds per ASTM C939 at
temperature extremes of minimum 45 degrees F and maximum 90 degrees F.
2. Compressive Strength at Fluid Consistency: 7,500 psi at 28 days, tested to ASTM Cl 09 as modified by ASTM Cl 107.
3. Working Time: 30 minutes.
2.7 CONCRETE MIX DESIGN REQUIREMENTS
A. Performance Mix Design:
1. Prepare mix design for each type and strength of concrete by either laboratory trial batch, verified by independent testing laboratory, or field experience methods as
prescribed by ACI 301.
B. Design Strength: As indicated in the Structural Drawings.
C. Water/ Cement Ratio for Slabs: 0.40 to 0.45, based on total cementitious material, including fly ash and other pozzolanic materials.
1. Water Content for Slabs: Maximum 270 pounds per cubic yard.
2. Total Combined Cement and Fly Ash Content for Slabs: Minimum 516 pounds per
3. Exterior Site Work Concrete: As specified by Civil Site Paving Sections.
D. Fly Ash:
1. Add to batch plant concrete mix as Portland cement replacement. Submit back-up data for mix design.
2. Fly ash content as a percentage of total weight of cementitious material:
a. Concrete Slabs: Refer to Structural Drawings
b. Other than Slabs: Refer to Structural Drawings.
E. Superplasticizers: Add high range, mid-range, and low range water-reducing admixtures to batch plant mix as means to develop sufficient slump and workability, as instructed by manufacturer.
F. Air-Entraining Agent at Exterior Concrete: Refer to Structural Drawings.
1. Do not add to interior slabs.
G. Substitute for welded wire fabric for reduction of plastic shrinkage cracking and drying shrinkage cracking where supported by ICC ES Evaluation Report or Legacy ICBO ES Report, except as otherwise indicated by Structural Drawings.
2.8 SOURCE QUALITY CONTROL
A. Conform to provisions and limitations ACI 340R and ASTM C90.
B. Batching and Mixing: Conform to ASTM C94, Option A for exact proportioning of mix design.
C. Admixtures: Add to within accuracy of 3 percent.
1. Add separately and verify compatibility in design mix, conforming to manufacturer's instructions.
2. Reject concrete that shows signs of segregation due to use of admixtures.
D. Elapsed Time From Start of Batching at Plant to Discharge at Project Site: Conform to following except where set-reducing admixtures are added by batch plant for hauls requiring longer time periods
1. Maximum 90 minutes and maximum 300 revolutions, whichever comes first after introducing mix water.
2. Air Temperatures:
a. Reduce mixing and delivery time to maximum 75 minutes for between 85 degrees F and 90 degrees F.
b. Reduce mixing and delivery time to 60 minutes for temperature above 90 Degrees F.
c. Monitor concrete in truck and reject if temperature rises to 89 degrees or 5 degrees F in 1 O minutes, indicating that concrete is setting up prior to discharge.
E. Mix Water: When feasible, add mix water required for mix design at batch plant.
F. Accelerating and Set Retarding Admixtures:
1. Accepted for long hauls for extending transportation time, cold weather, and hot weather conditions conforming to hot and cold weather placement requirements.
2. Measure concrete temperature and confirm that temperature has not exceeded 89 degrees For 5 degrees F in 10 minutes before acceptance at site.
G. Batching of Dry Materials and Adding Mix Water at Site:
1. Accepted for long hauls and for extending transportation time as an alternate procedure to adding accelerating and set retarding admixtures.
2. Add mix water under pressure at both front and back of mixing drum.
3. Mix at mixing speed for 70 to 1 00 revolutions before discharging.
H. Adding Mix Water at Project Site:
1. Do not add water to batch plant mix design except as prescribed by batch plant mix designer's written instructions.
2. Add mix water only when Special Inspector is present.
3. Truck drivers and others are not authorized to add water, except under direct supervision of batch plant quality control representative present at project site.
4. Accurately meter mix water to exact quantity sufficient to reach slump specified by batch plant mix design. Do not exceed specified slump.
5. Do not exceed design water/ cement ratio.
6. Make written record of water added to design mix and submit to Special Inspector at project site.
I. Do not use calcium chloride containing products.
A. Self-expanding, butyl-strip Waterstops: Manufactured rectangular or trapezoidal strip, butyl rubber with sodium bentonite or other hydrophilic polymers, for adhesive bonding to concrete, 3 / 4 by 1 inch.
B. Self-expanding, rubber-strip Waterstops: Manufactured rectangular or trapezoidal strip, bentonite-free hydrophilic polymer-modified chloroprene rubber, for adhesive bonding to concrete, 3 / 8 by 3 / 4 inch.
PART 3 EXECUTION
A. Verify installation conditions as satisfactory to receive work of this Section before beginning.
B. Verify that anchors, seats, plates, reinforcement, and other items cast into concrete are accurately located and are securely in place.
C. Verify formwork, reinforcing, and embedded Items are in place and ready for placement of concrete.
A. Protect Surrounding Areas: Preclude damage from work of this Section.
3.3 WATERSTOP INSTALLATION
A. Self-Expanding Strip Waterstops: Install in construction joints and at other locations indicated, according to manufacturer's written instructions, adhesive bonding,
mechanically fastening, and firmly pressing into place. Install in longest lengths practicable.
3.4 CONCRETE PLACEMENT
A. Conform to IBC Chapter 19, ACI 301, ACI 304R, ACI 304.2R, and provisions of Contract Documents.
B. Convey concrete using clean equipment of type and size needed for continuous concrete flow without loss of consolidation and separation of ingredients.
1. Do not use aluminum pipe for pumping concrete.
2. Do not place concrete pumping slurry in forms.
C. Place monolithically and deposit concrete as close to final position as practical.
D. Consolidate concrete, except slabs on grade, in forms by mechanical vibration as specified and in accordance with ACI 309.
E. Place concrete not to disturb in-place items such as reinforcement, inserts, embedded parts, formed expansion / contraction joints, and formwork.
F. Place Concrete continuously between construction and expansion/ contraction joints.
G. Place each lift while previous lift is still plastic.
H. Vibrate to obtain thorough consolidation, and complete filling of forms.
I. Exposed Concrete Walls: Provide smooth form concrete.
J. Exterior paved Surfaces: Slope away from building to slope to drain without ponding.
3.5 HOT WEATHER CONDITIONS
A. Conform to ACI 305R, Recommended Practice for Hot Weather Concreting.
3.6 CONCRETE SLAB FINISHING
A. Finish concrete slabs to ACI 301, ACI 302 .1 R.
B. Screeding: Screed to specified floor levelness and flatness tolerances
1. Tool salient edges of concrete.
2. Make sharp arise at wall to floor conditions.
C. Light Broom Finish:
1. Provide at exterior paved surfaces indicated on the Drawings. structural integrity. Locate joints perpendicular to primary reinforcing steel.
2. Extend reinforcing steel through joints.
3. Form true straight slab edges with top surfaces in alignment.
4. Form keyways or dowel between slabs as shown on Structural Drawings
5. Remove laitance and defective concrete. Wash surface.
6. Apply bonding agent against hardened concrete.
7. Dampen concrete surface. Remove excess water from formwork.
8. Saw cut contraction joints over construction joints between individual slab placements.
C. Expansion Joints:
1. Establish complete separation through exterior floor slabs at junctions with other building elements and points of restraint including walls, columns, and equipment
2. Fill to complete depth of joint with preformed asphalt impregnated joint filler, leaving 1 inch clearance at top for joint sealant and backer rod at exterior concrete slabs.
3. Use expansion joint filler with expansion joint caps as specified in Section 0311 00.
4. Leave ready to receive traffic sealants as specified in Section 079200.
D. Saw Cut Contraction Joints:
1. Saw cut interior and exterior slabs using soft cut method over green concrete as soon as slab will support foot traffic and before slab begins to experience shrinkage cracking, conforming to ACI 302.1 R Chapter 3.
2. Space saw-cuts at 2 to 3 foot spacing for each 1 inch depth of concrete slab and as accepted by Engineer.
3. Saw-cut joints minimum 1 inch deep and not less than 1 / 4 depth of concrete slab.
4. Saw-cut joints at 45 degree angle from corner of diamond shaped slab panels.
5. Exactly meet corners of cut outs to prevent cracking from corners.
6. Locate contraction joints over structurally supporting beams.
7. Maximum length to width ratio of panels in floor slabs is 1.5 to 1, although 1 to 1 is preferred.
8. Maximum length to width ration of panels in exterior pavement is 1.25 to 1, although 1 to 1 is preferred.
9. Do not form T-shaped or L-shaped saw-cut joints in panels.
10. Make joints continuous. Do not offset or stagger.
11. Space contraction joints equal distance between contraction joints at column lines, over construction joints, supporting structural beams, and change of substrate.
12. Burnish edges of joints while concrete is still green.
E. Cold Joints and Penetrations: Conform to provisions of Section 0311 00.
F. Projections through Prepared Openings: Fill voids with non-shrink grout containing waterproof concrete as instructed by manufacturer.
3.8 CURING CONCRETE WALLS
A. Conform to ACI 301 Section 5.3.6 and ACI 308.
B. At temperatures below 40 degrees F, protect concrete from freezing in accordance to ACI 306.1
C. Cure concrete for minimum 7 days, maintaining concrete surface temperature of not less than 50 degrees F, and as accepted by Engineer for high early strength concrete.
D. Water cure to maintain minimal moisture loss, and protect from excessive heat and cold during 7 day curing period or until concrete has reached 70 percent of averagecompressive strength (f=c).
3.9 CURING CONCRETE SLABS
A. Conform to methods specified by ACI 301 Section 5.3.6, ACI 302.1 R Section 9.2.1 through 184.108.40.206 and ACI 308 Section 2.2 through Section 2.3.2. Liquid membrane forming curing compounds not accepted.
B. Water Curing and Sheet Membrane Curing: Conform to ACI 302.1 R Section 9.2, excluding Section 9.2.4 and ACI 308 Section 2.2 or Section 2.3, excluding Section 2.3.3. Liquid film curing not accepted.
1. Fog spray or sprinkle and take other measures to maintain continuous layer of water over concrete surface.
2. Cover concrete slab with wet burlap or waterproof curing sheet.
3. Secure edges and corners of curing film to maintain in place over concrete and prevent drying.
4. Leave curing film in place as necessary to maintain suitable moisture content and temperature of concrete for 7 day curing period.
5. Keep concrete moist. Add water as needed to maintain wet surface.
6. At exterior slabs not subject to drying, curing film may be omitted when accepted by Engineer.
A. Solid Grouting under Structural Base Plates, Mechanical Equipment and Obstructed Voids and Joints.
1. Mix grout to fluid consistency.
2. Construct liquid tight formwork and pour grout in place.
3. To prevent voids, pour grout from only one side so that flow exits from opposite side. Work poured grout firmly in place.
4. Dry packing not permitted.
B. General Use: Include anchoring, filling cracks, and repairs such as filling rock pockets and pipe penetrations:
1. Mix non-shrink, aggregate grout to optimal fluid, flowable, or plastic consistency as necessary for solid grouting and repair.
2. Trowel grout at plastic consistency at voids and around pipe penetrations to fill voids and to match adjacent surfaces.
A. General Tolerances: Conform to ACI 117 and ACI 302.1 R for tolerances of construction and materials.
B. Vertical, Lateral, and Relative Alignment and Cross Sectional Dimensions: Conform to ACI 11 7 and as specified for offset between adjacent formwork facing material.
C. Floor Slab Tolerances: Conform to ACI 302.1 Rand ACI 11 7 for Floor Flatness and Floor Levelness tolerance. Measure and test to ASTM El 155 within 72 hours after placing
concrete slab and prior to removal of forms.
D. Slab Thickness Tolerances:
1. Cast and finish concrete slabs in constant thickness above steel framing members, conforming to ACI 11 7.
E. FL Tolerances: Do not apply to inclined slabs.
3.12 REPAIRING FLOOR SLAB FLATNESS AND LEVELNESS
A. Correct floor flatness and floor levelness not meeting specified tolerances conforming to ACI 301 and to make suitable substrate for finish floor systems.
B. Correct high areas by wet grinding after concrete has cured at least 14 days. Make test on trial area and obtain acceptance from Engineer before proceeding.
C. Correct low areas and swales at floors receiving finished flooring systems by cutting out and replacing with fresh concrete or by using cementitious underlayment as specified
3.13 STRUCTURAL CONCRETE REPAIR
A. Prior to Substantial Completion, repair:
1. Cracks exceeding 0.005 inch width extending full depth through slabs and walls.
2. Cracks that impair structural integrity.
3. Cracks that are subject to water leakage.
B. Inject cracks with epoxy or methyl methacrylate resin.
1. Use pressure or vacuum injection methods to monolithically bond and seal cracks without expanding cracks.
2. Submit and follow procedures acceptable to Engineer.
3.14 FIELD QUALITY CONTROL
A. Testing and Special Inspections: Conform to Division 01 requirements for testing and special inspections.
B. Concrete Slabs Receiving Resinous Polyurethane Flooring Systems: Perform testing to verify concrete substrate moisture content and pH level as suitable prior to installing resilient flooring system installations, conforming to manufacturer's Warranty provisions.
1. Testing Conditions: Don not conduct field quality control testing until:
a. Building envelope is enclosed and weathertight, if the building construction has not already reached this point
b. Interior ambient temperature and relative humidity are equivalent to that expected during occupancy by Owner.
2. Moisture Emissions of Concrete Floor Slabs: Test to ASTM Fl 869.
a. Maximum 3 pounds in 24 hours per 1000 square foot area.
b. Maximum 5 pounds in 24 hours per 1000 square foot area, under conditions acceptable to manufacturer.
3. Percent Relative Humidity within Concrete Floor Slabs: Test to ASTM F2170.
a. Maximum 75 percent relative humidity at center of slab.
b. Other percent relative humidity as accepted by flooring manufacturer.
4. Alkalinity of Concrete Substrate: Test to ASTM F710. Verify maximum pH factor of 9.0 at substrate surface to receive adhesives for resilient floor finishes and as
acceptable to flooring manufacturer.
5. Notify Engineer in the event of moisture emissions exceeding 3.0 pounds per 1 ,000 square foot in 24 hours, and alkalinity levels below 7.0 pH or above 9.0 pH.
6. Coordinate with manufacturers of finish flooring products for maximum acceptable moisture emissions from concrete slabs.
3.15 ADJUSTING CAST-IN-PLACE CONCRETE
A. Correct defective work not conforming to specified tolerances and referenced ACI Standards
B. Correct as necessary for smooth finished surface ready for installation of resilient flooring finishes specified under Division 9.
C. Remove and replace slabs that show excessive shrinkage cracks and slabs that do not freely drain, as directed by Engineer.
D. Following initial curing period, take necessary measures to decrease moisture emission levels to acceptable levels required for installation of finish flooring by lowering relative humidity, by increasing heat, and ventilating to exhaust moisture laden air outside. Do not use propane heaters or other moisture generating heating equipment.
3. 1 6 PROTECTION
A. Protect in-place concrete in accordance with ACI 301, Section 1 .8.
B. Cover to protect interior exposed concrete slabs subject to foot traffic or other damage with clean, unwrinkled kraft curing paper.
C. Lay down plywood or OSB cover board over concrete slabs in pathways subject to heavy foot traffic or rolling loads over uncured concrete.
D. Stack and stockpile materials and equipment in manner to prevent mechanical and chemical damage to concrete surfaces. Maintain stacking and stockpiling loading within structural tolerances.
E. Contain and promptly clean spills to maintain concrete suitable for bonding of finish flooring and final finishing of exposed concrete slabs.
END OF SECTION