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HomeMy WebLinkAbout03 30 00.docMATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 SECTION 03 30 00 - CAST-IN-PLACE CONCRETE PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section specifies cast-in place concrete, including formwork, reinforcement, concrete materials, mixture design, placement procedures, and finishes, for the following: 1. Footings. 2. Foundation walls. 3. Slabs-on-grade. 4. Building walls. 5. Building Frame Members. 6. Liquid sealers. B. Related Sections include the following: 1. Division 31 Section "Earthwork" for drainage fill under slabs-on-grade. 2. Division 7 Section “Sealants” for expansion, contraction, construction joints. 1.3 DEFINITIONS A. Cementitious Materials: Portland cement alone or in combination with fly ash; subject to compliance with requirements. 1.4 SUBMITTALS A. Product Data: For each type of product indicated. B. Design Mixtures: For each concrete mixture. Submit alternate design mixtures when characteristics of materials, Project conditions, weather, test results, or other circumstances warrant adjustments. 1. Indicate amounts of mixing water to be withheld for later addition at Project site. C. Steel Reinforcement Shop Drawings: Placing drawings that detail fabrication, bending, and placement. Include bar sizes, lengths, material, grade, bar schedules, stirrup spacing, bent bar diagrams, bar arrangement, splices and laps, mechanical connections, tie spacing, hoop spacing, and supports for concrete reinforcement. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 D. Formwork Shop Drawings: Prepared by or under the supervision of a qualified professional engineer detailing fabrication, assembly, and support of formwork. 1. Shoring and Re-shoring: Indicate proposed schedule and sequence of stripping formwork, shoring removal, and installing and removing re-shoring. E. Samples: For water stops and vapor retarder. F. Qualification Data: For manufacturer testing agency. G. Material Test Reports: For the following, from a qualified testing agency, indicating compliance with requirements: 1. Aggregates. Include service record data indicating absence of deleterious expansion of concrete due to alkali aggregate reactivity. H. Material Certificates: For each of the following, signed by manufacturers: 1. Cementitious materials. 2. Admixtures. 3. Form materials and form-release agents. 4. Steel reinforcement and accessories. 5. Water stops. 6. Floor and slab treatments. 7. Bonding agents. 8. Vapor retarder. 9. Semi-rigid joint filler. 10. Joint-filler strips. 11. Repair materials. I. Floor surface flatness and levelness measurements to determine compliance with specified tolerances. J. Field quality-control test and inspection reports. K. Minutes of pre-installation conference. L. Welding certificates. 1.5 QUALITY ASSURANCE A. Installer Qualifications: A qualified installer who employs on Project personnel qualified as ACI-certified Flatwork Technician and Finisher and a supervisor who is an ACI- certified Concrete Flatwork Technician. B. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete products and that complies with ASTM C 94 requirements for production facilities and equipment. 1. Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete Production Facilities." MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 C. Source Limitations: Obtain each type or class of cementitious 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. D. ACI Publications: Comply with the following unless modified by requirements in the Contract Documents: 1. ACI 301, "Specification for Structural Concrete," Sections 1 through 5. 2. ACI 117, "Specifications for Tolerances for Concrete Construction and Materials." E. Pre-installation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination." 1. Before submitting design mixtures, review concrete design mixture and examine procedures for ensuring quality of concrete materials. Require representatives of each entity directly concerned with cast-in-place concrete to attend, including the following: a. Contractor's superintendent. b. Independent testing agency responsible for concrete design mixtures. c. Ready-mix concrete manufacturer. d. Concrete subcontractor. 2. Review special inspection and 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, and joint-filler strips, semi-rigid joint fillers, forms and form removal limitations, shoring and re-shoring procedures, vapor retarder installation, anchor rod and anchorage device installation tolerances, steel reinforcement installation, floor and slab flatness and levelness measurement, concrete repair procedures, and concrete protection. 1.6 DELIVERY, STORAGE, AND HANDLING A. Steel Reinforcement: Deliver, store, and handle steel reinforcement to prevent bending and damage. B. Water stops: Store water stops under cover to protect from moisture, sunlight, dirt, oil, and other contaminants. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. In other Part 2 articles where titles below introduce lists, the following requirements apply to product selection: 1. Available Products: Subject to compliance with requirements, products that may be incorporated into the Work include, products specified. 2. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, manufacturers specified. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2.2 FORM-FACING MATERIALS A. 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. 1. Exterior-grade plywood panels, suitable for concrete forms, complying with DOC PS 1, and as follows: a. Medium-density overlay, Class 1 or better; mill-release agent treated and edge sealed. B. Rough-Formed Finished Concrete: Plywood, lumber, metal, or another approved material. Provide lumber dressed on at least two edges and one side for tight fit. C. Chamfer Strips: Wood, metal, PVC, or rubber strips, 3/4 by 3/4 inch, minimum. D. Form-Release Agent: Commercially formulated form-release agent that will not bond with, stain, or adversely affect concrete surfaces and will not impair subsequent treatments of concrete surfaces. 1. Formulate form-release agent with rust inhibitor for steel form-facing materials. E. Form Ties: Factory-fabricated, removable or snap-off metal or glass-fiber-reinforced plastic form ties designed to resist lateral pressure of fresh concrete on forms and to prevent spalling of concrete on removal. 1. Furnish units that will leave no corrodible metal closer than 1 inch to the plane of exposed concrete surface. 2. Furnish ties that, when removed, will leave holes no larger than 1 inch in diameter in concrete surface. 3. Furnish ties with integral water-barrier plates to walls indicated to receive damp- proofing or waterproofing. 2.3 STEEL REINFORCEMENT A. Reinforcing Bars: ASTM A 615, Grade 60, deformed. B. Plain-Steel Welded Wire Reinforcement: ASTM A 185, plain, fabricated from as-drawn steel wire into flat sheets. C. Low-alloy steel reinforcing bars: ASTM A706, deformed. 2.4 REINFORCEMENT ACCESSORIES A. Joint Dowel Bars: ASTM A 615, Grade 60, plain-steel bars, cut bars true to length with ends square and free of burrs. B. 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 pre-cast concrete according to CRSI's "Manual of Standard Practice," of greater compressive strength than concrete and as follows: MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. 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. 2.5 CONCRETE MATERIALS A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout Project: 1. Portland cement: ASTM C 150, Type I/II, gray. Supplement with the following: a. Fly Ash: ASTM C 618, Class C or F. B. Normal-Weight Aggregates: ASTM C 33, Class 5S coarse aggregate or better, graded. Provide aggregates from a single source with documented service record data of at least 10 years' satisfactory service in similar applications and service conditions using similar aggregates and cementitious materials. 1. Maximum Coarse-Aggregate Size: 1 inch nominal. C. Water: ASTM C 94 and potable. 2.6 ADMIXTURES A. Air-Entraining Admixture: ASTM C 260. B. 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. 1. Water-Reducing Admixture: ASTM C 494, Type A. 2. Retarding Admixture: ASTM C 494, Type B. 3. Water-Reducing and Retarding Admixture: ASTM C 494, Type D. 4. High-Range, Water-Reducing Admixture: ASTM C 494, Type F. 5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494, Type G. 6. Plasticizing and Retarding Admixture: ASTM C 1017, Type II. C. Non-Set-Accelerating Corrosion-Inhibiting Admixture: Commercially formulated, non- set-accelerating, anodic inhibitor or mixed cathodic and anodic inhibitor; capable of forming a protective barrier and minimizing chloride reactions with steel reinforcement in concrete. 1. Available Products: a. Grace Construction Products, W. R. Grace & Co.; DCI-S. b. Master Builders, Inc.; Rheocrete 222+. c. Sika Corporation; FerroGard-901. 2.7 WATER-STOPS A. Flexible PVC Water-stops: CE CRD-C 572, for embedding in concrete to prevent passage of fluids through joints. Factory fabricate corners, intersections, and directional changes. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. Available Manufacturers: a. Meadows, W. R., Inc. b. Tamms Industries, Inc. c. Greenstreak. 2. Profile: Ribbed with center bulb. 3. Dimensions: 6 inches by 3/8 inch thick; non-tapered. B. Self-Expanding Butyl Strip Water-stops: Manufactured rectangular or trapezoidal strip, butyl rubber with sodium bentonite or other hydrophilic polymers, for adhesive bonding to concrete, ¾ inch by 1 inch. 1. Products: a. Colloid Environmental Technologies Company; Volclay Water-stop – RX. 2.8 VAPOR RETARDERS A. Provide cover over prepared base material only in heated and habitable rooms on slabs-on-ground unless otherwise noted on the plans. Use only materials which are resistant to decay when coated in accordance with ASTM E154. 1. Plastic Vapor Retarder: ASTM E 1745, Class A. Include manufacturer's recommended adhesive or pressure-sensitive tape; or a. Fortifiber Corporation; Moistop Ultra A. b. Raven Industries Inc.; Vapor Block 15. c. Reef Industries, Inc.; Griffolyn Type-65G. B. Granular Fill: See SOIL REPORT for specific composition of sub-drainage fill layer. 2.9 CONCRETE FLOOR AND SURFACE TREATMENTS A. Hardeners Liquid Sealers/Hardener: to be applied only on exposed non-vehicular and concrete floors cured with moisture retentive or absorptive covers. 1. Refer to Finish Legend on Drawings. 2.10 MOISTURE CURE CONCRETE MATERIALS A. Only moisture cure methods to be applied on floor surfaces and vertical wall surfaces receiving SBS modified bitumen waterproofing. B. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf, weighing approximately 9 oz. /sq. yd. when dry. C. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet. 1. Reef Industries, Transguard 4000 D. Water: Potable. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2.11 OTHER CONCRETE CURING MATERIALS A. Use a cure method based on one or more of the following systems for non-vehicular and non-pedestrian concrete surfaces: B. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for application to fresh concrete. 1. Available Products: a. Dayton Superior Corporation; Sure Film. b. Euclid Chemical Company (The); Eucobar. c. Meadows, W. R., Inc.; Sealtight Evapre. C. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf, weighing approximately 9 oz. /sq. yd. when dry. D. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet. 1. Reef Industries, Transguard 4000 E. Water: Potable. F. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315, Type 1, Class A. 1. Available Products: a. Conspec Marketing & Manufacturing Co., Inc., a Dayton Superior Company; Sealcure 1315 WB. b. Euclid Chemical Company (The); Super Diamond Clear VOX. c. L&M Construction Chemicals, Inc.; Lumiseal WB Plus. d. Meadows, W. R., Inc.; Vocomp-30. G. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 309, Type 1, Class B, 18 to 25 per cent solids, non-dissipating, certified by curing compound manufacturer to not interfere with bonding of floor covering. 1. Products: a. Conspec Marketing & Manufacturing Co., Inc., a Dayton Superior Company; High Seal. b. Dayton Superior Corporation; Safe cure and Seal (J-19). c. Euclid Chemical Company (The); Diamond Clear VOX. d. L&M Construction Chemicals, Inc.; Dress & Seal WB. e. Meadows, W. R., Inc.; Vocomp-20. f. Sonneborn, Div. of ChemRex, Kure-N-Seal. 2.12 RELATED MATERIALS A. Isolation Joint Fillers: Fillers shall consist of 1/2 inch width strips of neoprene, synthetic rubber, or approved substitute, extending the full depth of the slab. Sealant shall be two-part elastomeric type, polyurethane base. See Section 07 92 00 Sealants for specific products. B. Construction and Contraction Joint Fillers: MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. For Interior Conditions with uniform slab temperatures: Comply with ACI 301 and recommendations of ACI 302.1R. Sealant shall be two-part semi- rigid epoxy, and shall have minimum Shore A Hardness of 80 when measured with ASTM D 2240. a. Products: 1) Dayton Superior; J-52. 2) Euclid Chemical Company (The): Euco 700. 2. For Exterior Conditions or conditions that do not have uniform slab temperatures: Fillers shall consist of a two-part elastomeric type, polyurethane base applied full depth of joint. See Section 07 92 00 Sealants for specific products. C. Epoxy Bonding Adhesive: ASTM C 881, two-component epoxy resin, capable of humid curing and bonding to damp surfaces, of class suitable for application temperature and of grade to suit requirements, and as follows: 1. Types IV and V, load bearing, for bonding hardened or freshly mixed concrete to hardened concrete. D. Reglets: Fabricate reglets of not less than 0.0217-inch- thick, galvanized steel sheet. Temporarily fill or cover face opening of reglet to prevent intrusion of concrete or debris. E. Dovetail Anchor Slots: Hot-dip galvanized steel sheet, not less than 0.0336 inch thick, with bent tab anchors. Temporarily fill or cover face opening of slots to prevent intrusion of concrete or debris. 2.13 REPAIR MATERIALS A. Repair Under-layment: Cement-based, polymer-modified, self-leveling product that can be applied in thicknesses from 1/8 inch and that can be feathered at edges to match adjacent floor elevations. 1. Cement Binder: ASTM C 150, portland cement or hydraulic or blended hydraulic cement as defined in ASTM C 219. 2. Primer: Product of under-layment manufacturer recommended for substrate, conditions, and application. 3. Aggregate: Well-graded, washed gravel, 1/8 to 1/4 inch or coarse sand as recommended by under-layment manufacturer. 4. Compressive Strength: Not less than 4100 psi at 28 days when tested according to ASTM C 109. B. Repair Over-layment: Cement-based, polymer-modified, self-leveling product that can be applied in thicknesses from 1/8 inch and that can be feathered at edges to match adjacent floor elevations. 1. Cement Binder: ASTM C 150, portland cement or hydraulic or blended hydraulic cement as defined in ASTM C 219. 2. Primer: Product of topping manufacturer recommended for substrate, conditions, and application. 3. Aggregate: Well-graded, washed gravel, 1/8 to 1/4 inch or coarse sand as recommended by topping manufacturer. 4. Compressive Strength: Not less than 5000 psi at 28 days when tested according to ASTM C 109. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 2.14 CONCRETE MIXTURES, GENERAL A. Prepare design mixtures for each type and strength of concrete, proportioned on the basis of laboratory trial mixture or field test data, or both, according to ACI 301. 1. Use a qualified independent testing agency for preparing and reporting proposed mixture designs based on laboratory trial mixtures. B. Cementitious Materials: Limit percentage, by weight, of cementitious materials other than portland cement in concrete as follows: 1. Fly Ash: 15 percent. C. Limit water-soluble, chloride-ion content in hardened concrete to 0.15 percent by weight of cement. D. Admixtures: Use admixtures according to manufacturer's written instructions. 1. Use high-range water-reducing or plasticizing admixture in concrete, as required, for placement and workability. 2. Use water-reducing and retarding admixture when required by high temperatures, low humidity, or other adverse placement conditions. 3. Use water-reducing admixture in pumped concrete, concrete for parking structure slabs, concrete required to be watertight, and concrete with a water-cementitious materials ratio below 0.50. 4. Use corrosion-inhibiting admixture in concrete mixtures for all concrete. 2.15 CONCRETE MIXTURES FOR BUILDING ELEMENTS A. Footings: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 3000 psi Insert strength at 28 days. 2. Maximum Water-Cementitious Materials Ratio: 0.56. 3. Slump Limit: 4 inches plus or minus 1 inch. B. Foundation Walls: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 4000 psi at 28 days. 2. Maximum Water-Cementitious Materials Ratio: 0.45. 3. Slump Limit: 4 inches or 8 inches for concrete with verified slump of 2 to 4 inches before adding high-range water-reducing admixture or plasticizing admixture, plus or minus 1 inch. 4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 1-inch nominal maximum aggregate size. C. Slabs-on-Grade: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 4000 psi at 28 days. 2. Minimum Cementitious Materials Content: 600 lb/cu. yd. 3. Hes, plus or minus 1 inch. 4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 1-inch nominal maximum aggregate size. D. Suspended Slabs: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 4000 psi at 28 days. 2. Minimum Cementitious Materials Content: 564 lb/cu. yd. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 3. Slump Limit: 4 inches, plus or minus 1 inch. 4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 1-inch nominal maximum aggregate size. E. Building Frame Members: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 4000 psi at 28 days. 2. Maximum Water-Cementitious Materials Ratio: 0.45. 3. Slump Limit: 4 inches or 8 inches for concrete with verified slump of 2 to 4 inches before adding high-range water-reducing admixture or plasticizing admixture, plus or minus 1 inch. 4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 1-inch nominal maximum aggregate size. F. Building Walls: Proportion normal-weight concrete mixture as follows: 1. Minimum Compressive Strength: 4000 psi at 28 days. 2. Maximum Water-Cementitious Materials Ratio: 0.45. 3 Slump Limit: 4 inches or 8 inches for concrete with verified slump of 2 to 4 inches before adding high-range water-reducing admixture or plasticizing admixture, plus or minus 1 inch. 4. Air Content: 6 percent, plus or minus 1.5 percent at point of delivery for 1-inch nominal maximum aggregate size. 2.16 FABRICATING REINFORCEMENT A. Fabricate steel reinforcement according to CRSI's "Manual of Standard Practice." 2.17 CONCRETE MIXING A. Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to ASTM C 94, and furnish batch ticket information. 1. When air temperature is between 85 and 90 deg F, reduce mixing and delivery time from 1-1/2 hours to 75 minutes; when air temperature is above 90 deg F, reduce mixing and delivery time to 60 minutes. PART 3 - EXECUTION 3.1 FORMWORK A. 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 structure can support such loads. B. Construct formwork so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117. C. Limit concrete surface irregularities, designated by ACI 347R as abrupt or gradual, as follows: MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 1. Class A, 1/8 inch for smooth-formed finished surfaces. 2. Class D, 1 inch for rough-formed finished surfaces. D. Construct forms tight enough to prevent loss of concrete mortar. E. Fabricate forms for easy removal without hammering or prying against concrete surfaces. Provide crush or wrecking plates where stripping may damage cast concrete surfaces. Provide top forms for inclined surfaces steeper than 1.5 horizontal to 1 vertical. 1. Install keyways, reglets, recesses, and the like, for easy removal. 2. Do not use rust-stained steel form-facing material. F. 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. G. Provide temporary openings for cleanouts and inspection ports where interior area of formwork is inaccessible. Close openings with panels tightly fitted to forms and securely braced to prevent loss of concrete mortar. Locate temporary openings in forms at inconspicuous locations. H. Chamfer exterior corners and edges of permanently exposed concrete. I. Form openings, chases, offsets, sinkages, keyways, reglets, blocking, screeds, and bulkheads required in the Work. Determine sizes and locations from trades providing such items. J. Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, and other debris just before placing concrete. K. Retighten forms and bracing before placing concrete, as required, to prevent mortar leaks and maintain proper alignment. L. Coat contact surfaces of forms with form-release agent, according to manufacturer's written instructions, before placing reinforcement. 3.2 EMBEDDED ITEMS A. Place and secure anchorage devices and other embedded items required for adjoining work that is attached to or supported by cast-in-place concrete. Use setting drawings, templates, diagrams, instructions, and directions furnished with items to be embedded. 1. Install anchor rods, accurately located, to elevations required and complying with tolerances in Section 7.5 of AISC's "Code of Standard Practice for Steel Buildings and Bridges." 2. Install reglets to receive waterproofing and to receive through-wall flashings in outer face of concrete frame at exterior walls, where flashing is shown at lintels, shelf angles, and other conditions. 3. Install dovetail anchor slots in concrete structures as indicated. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 3.4 REMOVING AND REUSING FORMS A. General: Formwork for sides of beams, walls, columns, and similar parts of the Work that does not support weight of concrete may be removed after cumulatively curing at not less than 50 deg F for 24 hours after placing concrete, if concrete is hard enough to not be damaged by form-removal operations and curing and protection operations are maintained. 1. Leave formwork for beam soffits, joists, slabs, and other structural elements that supports weight of concrete in place until concrete has achieved at least 70 percent of its 28-day design compressive strength. 2. Remove forms only if shores have been arranged to permit removal of forms without loosening or disturbing shores. B. Clean and repair surfaces of forms to be reused in the Work. Split, frayed, delaminated, or otherwise damaged form-facing material will not be acceptable for exposed surfaces. Apply new form-release agent. C. When forms are reused, clean surfaces, remove fins and laitance, and tighten to close joints. Align and secure joints to avoid offsets. Do not use patched forms for exposed concrete surfaces unless approved by Architect. 3.5 SHORES AND RESHORES A. Comply with ACI 318 and ACI 301 for design, installation, and removal of shoring and re- shoring. 1. Do not remove shoring or re-shoring until measurement of slab tolerances is complete. B. Plan sequence of removal of shores and re-shore to avoid damage to concrete. Locate and provide adequate re-shoring to support construction without excessive stress or deflection. 3.6 VAPOR RETARDERS A. Plastic Vapor Retarders: Place, protect, and repair vapor retarders according to ASTM E 1643 and manufacturer's written instructions. 1. Lap joints 6 inches and seal with manufacturer's recommended tape. B. Granular Course: Cover vapor retarder with granular fill, moisten, and compact with mechanical equipment to elevation tolerances of plus 0 inch or minus 3/4 inch. 1. Place and compact a 1/2-inch- thick layer of fine-graded granular material over granular fill. 3.7 STEEL REINFORCEMENT A. General: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement. 1. Do not cut or puncture vapor retarder. Repair damage and reseal vapor retarder before placing concrete. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 B. Clean reinforcement of loose rust and mill scale, earth, ice, and other foreign materials that would reduce bond to concrete. C. Accurately position, support, and secure reinforcement against displacement. Locate and support reinforcement with bar supports to maintain minimum concrete cover. Do not tack weld crossing reinforcing bars. D. Set wire ties with ends directed into concrete, not toward exposed concrete surfaces. E. 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. 3.8 JOINTS A. General: Construct joints true to line with faces perpendicular to surface plane of concrete. B. Construction Joints: Install so strength and appearance of concrete are not impaired, at locations indicated or as approved by Architect. 1. Place joints perpendicular to main reinforcement. Continue reinforcement across construction joints, unless otherwise indicated. Do not continue reinforcement through sides of strip placements of floors and slabs. 2. Form keyed joints as indicated. Embed keys at least 1-1/2 inches into concrete. 3. Locate joints for beams, slabs, joists, and girders in the middle third of spans. Offset joints in girders a minimum distance of twice the beam width from a beam- girder intersection. 4. Locate horizontal joints in walls and columns at underside of floors, slabs, beams, and girders and at the top of footings or floor slabs. 5. Space vertical joints in walls as indicated. Locate joints beside piers integral with walls, near corners, and in concealed locations where possible. 6. Use epoxy-bonding adhesive at locations where fresh concrete is placed against hardened or partially hardened concrete surfaces. C. Contraction Joints in Slabs-on-Grade and Topping Slabs: Form weakened-plane contraction joints, sectioning concrete into areas as indicated. Construct contraction joints for a depth equal to at least one-fourth of concrete thickness as follows: 1. Sawed Joints: Form contraction joints with power saws equipped with shatterproof abrasive or diamond-rimmed blades. Cut 1/8 inch wide joints into concrete when cutting action will not tear, abrade or otherwise damage surface and before concrete develops random contraction cracks. D. Isolation Joints in Slabs-on-Grade: After removing formwork, install joint-filler strips at slab junctions with vertical surfaces, such as column pedestals, foundation walls, grade beams, and other locations, as indicated. 1. Terminate full-width joint-filler strips not less than 1/2 inch or more than 1 inch below finished concrete surface where joint sealants, specified in Division 07 Section "Joint Sealants," are indicated. 2. Install joint-filler strips in lengths as long as practicable. Where more than one length is required, lace or clip sections together. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 E. Doweled Joints: Install dowel bars and support assemblies at joints where indicated. Lubricate or asphalt coat one-half of dowel length to prevent concrete bonding to one side of joint. 3.9 WATERSTOPS A. Flexible Water-stops: Install in construction joints and at other joints indicated to form a continuous diaphragm. Install in longest lengths practicable. Support and protect exposed water-stops during progress of the Work. Field-fabricate joints in water-stops according to manufacturer's written instructions. 3.10 CONCRETE PLACEMENT A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed. B. Before test sampling and placing concrete, water may be added at Project site, subject to limitations of ACI 301. 1. Do not add water to concrete after adding high-range water-reducing admixtures to mixture. C. Deposit concrete continuously in one layer or in horizontal 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 indicated. Deposit concrete to avoid segregation. 1. Deposit concrete in horizontal layers of depth to not exceed formwork design pressures and in a manner to avoid inclined construction joints. 2. Consolidate placed concrete with mechanical vibrating equipment according to ACI 301. 3. Do not use vibrators to transport concrete inside forms. Insert and withdraw vibrators vertically at uniformly spaced locations to rapidly penetrate placed layer and at least 6 inches into preceding layer. Do not insert vibrators into lower layers of concrete that have begun to lose plasticity. At each insertion, limit duration of vibration to time necessary to consolidate concrete and complete embedment of reinforcement and other embedded items without causing mixture constituents to segregate. D. 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. 1. Consolidate concrete during placement operations so concrete is thoroughly worked around reinforcement and other embedded items and into corners. 2. Maintain reinforcement in position on chairs during concrete placement. 3. Screed slab surfaces with a straightedge and strike off to correct elevations. 4. Slope surfaces uniformly to drains where required. 5. Begin initial floating using bull floats or darbies to form a uniform and open- textured surface plane, before excess bleed-water appears on the surface. Do not further disturb slab surfaces before starting finishing operations. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 E. 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. 1. 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. 2. 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. 3. Do not use calcium chloride, salt, or other materials containing antifreeze agents or chemical accelerators unless otherwise specified and approved in mixture designs. F. Hot-Weather Placement: Comply with ACI 301 and as follows: 1. 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. 2. Fog-spray forms, steel reinforcement, and sub-grade just before placing con- crete. Keep sub-grade uniformly moist without standing water, soft spots, or dry areas. 3.11 FINISHING FORMED SURFACES A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes and defects repaired and patched. Remove fins and other projections that exceed specified limits on formed-surface irregularities. 1. Apply to concrete surfaces not exposed to public view. B. Smooth-Formed Finish: As-cast concrete texture imparted by form-facing material, arranged in an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and defects. Remove fins and other projections that exceed specified limits on formed-surface irregularities. 1. Apply to concrete surfaces exposed to public view, to receive a rubbed finish or to be covered with a coating or covering material applied directly to concrete. C. Rubbed Finish: Apply the following to smooth-formed finished as-cast concrete exposed to view only where imperfections and irregularities such as honeycombing or burrs occur: 1. Smooth-Rubbed Finish: Not later than one day after form removal, moisten concrete surfaces where imperfections and irregularities such as honeycombing or burrs occur and rub with carborundum brick or another abrasive until producing a uniform color and texture. Do not apply cement grout other than that created by the rubbing process. D. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent unformed surfaces, unless otherwise indicated. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 3.12 FINISHING FLOORS AND SLABS A. General: Comply with ACI 302.1R recommendations for screeding, re-straightening, and finishing operations for concrete surfaces. Do not wet concrete surfaces. B. Scratch Finish: While still plastic, texture concrete surface that has been screeded and bull-floated or darbied. Use stiff brushes, brooms, or rakes to produce profile amplitude of 1/4 inch in 1 direction. 1. Apply scratch finish to surfaces to receive mortar setting beds for bonded cementitious floor finishes. C. Float Finish: Consolidate surface with power-driven floats or by hand floating if area is small or inaccessible to power driven floats. Re-straighten, cut down high spots, and fill low spots. Repeat float passes and re-straightening until surface is left with a uniform, smooth, granular texture. 1. Apply float finish to surfaces to receive trowel finish and to be covered with fluid- applied or sheet waterproofing, built-up or membrane roofing, or sand-bed terrazzo. D. Trowel Finish: After applying float finish, apply first troweling and consolidate concrete by hand or power-driven trowel. Continue troweling passes and re-straighten until surface is free of trowel marks and uniform in texture and appearance. Grind smooth any surface defects that would telegraph through applied coatings or floor coverings. 1. Apply a trowel finish to surfaces exposed to view or to be covered with resilient flooring, carpet, and ceramic or quarry tile set over a cleavage membrane, paint, or another thin-film-finish coating system. 2. Finish surfaces to the following tolerances, according to ASTM E 1155, for a randomly trafficked floor surface: a. Specified overall values of flatness, F (F) 25; and of levelness, F (L) 20; with minimum local values of flatness, F (F) 17; and of levelness, F(L) 15. b. Specified overall values of flatness, F (F) 30; and of levelness, F (L) 20; with minimum local values of flatness, F (F) 24; and of levelness, F (L) 15; for suspended slabs. 3. All slabs on grade for parking areas will be hard trowel finished. E. Trowel and Fine-Broom Finish: Apply a first trowel finish to surfaces where ceramic or quarry tile is to be installed by either thickset or thin-set method. While concrete is still plastic, slightly scarify surface with a fine broom. 1. Comply with flatness and levelness tolerances for trowel finished floor surfaces. F. Steel Trowel and Medium- Broom Finish: Apply a steel trowel finish to exterior concrete platforms, steps, ramps, vehicular parking surfaces, pedestrian walks and elsewhere as indicated. 1. Immediately after steel trowel finishing, slightly roughen trafficked surface by brooming with fiber-bristle broom perpendicular to main traffic route. Coordinate required final finish with Architect before application 2. Moisture cure only, all steel-troweled and medium broom finished concrete, as described in Paragraph 2.12. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 3.13 MISCELLANEOUS CONCRETE ITEMS A. Filling In: Fill in holes and openings left in concrete structures, unless otherwise indicated, after work of other trades is in place. Mix, place, and cure concrete, as specified, to blend with in-place construction. Provide other miscellaneous concrete filling indicated or required to complete the Work. B. Curbs: Provide monolithic finish to interior curbs by stripping forms while concrete is still green and by steel-troweling surfaces to a hard, dense finish with corners, intersections, and terminations slightly rounded. 3.14 CONCRETE PROTECTING AND CURING A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with ACI 306.1 for cold-weather protection and ACI 301 for hot- weather protection during curing. B. Evaporation Retarder: Apply evaporation retarder to unformed concrete surfaces if hot, dry, or windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h before and during finishing operations. Apply according to manufacturer's written instructions after placing, screeding, and bull floating or darbying concrete, but before float finishing. C. Formed Surfaces: Cure formed concrete surfaces, including underside of beams, elevated or supported slabs, and other similar surfaces. If forms remain during curing period, moist cure after loosening forms. If removing forms before end of curing period, continue curing for the remainder of the curing period. D. Unformed Surfaces: Begin curing immediately after finishing concrete. Cure unformed surfaces, including floors and slabs, concrete floor toppings, and other surfaces. E. For moisture cure only application and vertical wall surfaces receiving SBS modified bitumen waterproofing, cure concrete according to ACI 308.1, only by one or a combination of the following methods: 1. Moisture Curing: Keep surfaces continuously moist for not less than seven days with the following materials: a. Water. b. Continuous water-fog spray. c. Absorptive cover, water saturated, and kept continuously wet. Cover concrete surfaces and edges with 12-inch lap over adjacent absorptive covers. 2. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture- retaining cover for curing concrete, placed in widest practicable width, with sides and ends lapped at least 12 inches, and sealed by waterproof tape or adhesive. Cure for not less than seven days. Immediately repair any holes or tears during curing period using cover material and waterproof tape. a. Moisture cure or use moisture-retaining covers to cure concrete surfaces to receive floor coverings. b. Moisture cure or use moisture-retaining covers to cure concrete surfaces to receive penetrating liquid floor treatments. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 F. For other concrete, cure concrete according to ACI 308.1, only by one or a combination of the following methods: 1. Curing and Sealing Compound: Apply uniformly to surface areas designated to receive curing and sealing compound, in a continuous operation by power spray or roller according to manufacturer's written instructions. Recoat areas subjected to heavy rainfall within three hours after initial application. Repeat process 24 hours later and apply a second coat. Maintain continuity of coating and repair damage during curing period. 2. Curing Compound: Apply uniformly in continuous operation by power spray or roller according to manufacturer’s written instructions. Recoat areas subjected to heavy rainfall within three hours after initial application. Maintain continuity of coating and repair damage during curing period. a. After curing period has elapsed, remove curing compound without damaging concrete surfaces by method recommended by curing compound manufacturer unless manufacturer certifies curing compound will not interfere with bonding of floor covering used on Project. 3. Moisture curing as described above. 3.15 LIQUID FLOOR TREATMENTS A. Hardener-Sealer Treatment: Prepare, apply, and finish specified concrete floor areas according to manufacturer's written instructions. 1. Remove any overspray of curing compounds, or sealers, and any additional oil, dirt, laitance, and other contaminants and complete surface repairs. 2. Apply to concrete after time period recommended by floor treatment manufacturer. 3.16 JOINT FILLING A. Prepare, clean, and install joint filler according to manufacturer's written instructions. 1. Defer joint filling until concrete has aged at least six month(s). Do not fill joints until construction traffic has permanently ceased. B. Remove dirt, debris, saw cuttings, curing compounds, and sealers from joints; leave contact faces of joint clean and dry. C. Install joint filler full depth in saw-cut joints and at least 2 inches deep in formed joints. Overfill joint and trim joint filler flush with top of joint after hardening. 3.17 CONCRETE SURFACE REPAIRS A. Defective Concrete: Repair and patch defective areas when approved by Architect. Remove and replace concrete that cannot be repaired and patched to Architect's approval. B. Patching Mortar: Mix dry-pack patching mortar, consisting of one part portland cement to two and one-half parts fine aggregate passing a No. 16 sieve, using only enough water for handling and placing. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 C. Repairing Formed Surfaces: Surface defects include color and texture irregularities, cracks, spalls, air bubbles, honeycombs, rock pockets, fins and other projections on the surface, and stains and other discolorations that cannot be removed by cleaning. 1. Immediately after form removal, cut out honeycombs, rock pockets, and voids more than 1/2 inch in any dimension in solid concrete, but not less than 1 inch in depth. Make edges of cuts perpendicular to concrete surface. Clean, dampen with water, and brush-coat holes and voids with bonding agent. Fill and compact with patching mortar before bonding agent has dried. Fill form-tie voids with patching mortar or cone plugs secured in place with bonding agent. 2. Repair defects on surfaces exposed to view by blending white portland cement and standard portland cement so that, when dry, patching mortar will match surrounding color. Patch a test area at inconspicuous locations to verify mixture and color match before proceeding with patching. Compact mortar in place and strike off slightly higher than surrounding surface. 3. Repair defects on concealed formed surfaces that affect concrete's durability and structural performance as determined by Architect. D. Repairing Unformed Surfaces: Test unformed surfaces, such as floors and slabs, for finish and verify surface tolerances specified for each surface. Correct low and high areas. Test surfaces sloped to drain for trueness of slope and smoothness; use a sloped template. 1. Repair finished surfaces containing defects. Surface defects include spalls, pop outs, honeycombs, rock pockets, crazing and cracks in excess of 0.01 inch wide or that penetrate to reinforcement or completely through un-reinforced sections regardless of width, and other objectionable conditions. 2. After concrete has cured at least 14 days, correct high areas by grinding. 3. Correct localized low areas during or immediately after completing surface finishing operations by cutting out low areas and replacing with patching mortar. Finish repaired areas to blend into adjacent concrete. 4. Correct other low areas scheduled to receive floor coverings with a repair under- layment. Prepare, mix, and apply repair under-layment and primer according to manufacturer's written instructions to produce a smooth, uniform, plane, and level surface. Feather edges to match adjacent floor elevations. 5. Correct other low areas scheduled to remain exposed with a repair topping. Cut out low areas to ensure a minimum repair topping depth of 1/4 inch to match adjacent floor elevations. Prepare, mix, and apply repair topping and primer according to manufacturer's written instructions to produce a smooth, uniform, plane, and level surface. 6. Repair defective areas, except random cracks and single holes 1 inch or less in diameter, by cutting out and replacing with fresh concrete. Remove defective areas with clean, square cuts and expose steel reinforcement with at least a 3/4- inch clearance all around. Dampen concrete surfaces in contact with patching concrete and apply bonding agent. Mix patching concrete of same materials and mixture as original concrete except without coarse aggregate. Place, compact, and finish blending with adjacent finished concrete. Cure in same manner as adjacent concrete. 7. Repair random cracks and single holes 1 inch or less in diameter with patching mortar. Groove top of cracks and cut out holes to sound concrete and clean off dust, dirt, and loose particles. Dampen cleaned concrete surfaces and apply bonding agent. Place patching mortar before bonding agent has dried. Compact patching mortar and finish to match adjacent concrete. Keep patched area continuously moist for at least 72 hours. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 E. Perform structural repairs of concrete, subject to Architect's approval, using epoxy adhesive and patching mortar. F. Repair materials and installation not specified above may be used, subject to Architect's approval. 3.18 FIELD QUALITY CONTROL A. Testing and Inspecting: Owner will engage a special inspector and qualified testing and inspecting agency to perform field tests and inspections and prepare test reports. B. The testing laboratory shall have prime responsibility for review, verification inspection, and testing of the concrete producer's materials, operations, facilities, and quality control procedures and evaluating the results for conformance with these specifications complying with ACI 121R. C. The Testing Laboratory will be required to provide evidence of recent inspection of its facilities by the Cement and Concrete Reference Laboratory of the National Bureau of Standards (NBS) and to show that any deficiencies have been corrected. D. Inspections: 1. Steel reinforcement placement. 2. Headed bolts and studs. 3. Verification of use of required design mixture. 4. Concrete placement, including conveying and depositing. 5. Curing procedures and maintenance of curing temperature. 6. Verification of concrete strength before removal of shores and forms from beams and slabs. E. Concrete Tests: Testing of composite samples of fresh concrete obtained according to ASTM C 172 shall be performed according to the following requirements: 1. Testing Frequency: Obtain one composite sample for each day's pour of each concrete mixture exceeding 5 cu. yd., but less than 25 cu. yd., plus one set for each additional 50 cu. yd. or fraction thereof. a. When frequency of testing will provide fewer than five compressive- strength tests for each concrete mixture, testing shall be conducted from at least five randomly selected batches or from each batch if fewer than five are used. 2. Slump: ASTM C 143; one test at point of placement for each composite sample, but not less than one test for each day's pour of each concrete mixture. Perform additional tests when concrete consistency appears to change. 3. Air Content: ASTM C 231, pressure method, for normal-weight concrete; one test for each composite sample, but not less than one test for each day's pour of each concrete mixture. 4. Concrete Temperature: ASTM C 1064; one test hourly when air temperature is 40 deg F and below and when 80 deg F and above, and one test for each composite sample. 5. Compression Test Specimens: ASTM C 31. a. Cast and laboratory cure two sets of two standard cylinder specimens for each composite sample. MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 03 30 00 - CARMEL CITY CENTER Date 03.26.12 CAST-IN-PLACE CONCRETE MATT THE MILLER’S; CARMEL CITY CENTER; SUITE 101 b. Cast and field cure two sets of two standard cylinder specimens for each composite sample. 6. Compressive-Strength Tests: ASTM C 39; test one set of two laboratory-cured specimens at 7 days and one set of two specimens at 28 days. a. Test one set of two field-cured specimens at 7 days and one set of two specimens at 28 days. b. A compressive-strength test shall be the average compressive strength from a set of two specimens obtained from same composite sample and tested at age indicated. 7. When strength of field-cured cylinders is less than 85 percent of companion laboratory-cured cylinders, Contractor shall evaluate operations and provide corrective procedures for protecting and curing in-place concrete. 8. Strength of each concrete mixture will be satisfactory if every average of any three consecutive compressive-strength tests equals or exceeds specified compressive strength and no compressive-strength test value falls below specified compressive strength by more than 500 psi. 9. Test results shall be reported in writing to Architect, concrete manufacturer, and Contractor within 48 hours of testing. Reports of compressive-strength tests shall contain Project identification name and number, date of concrete placement, name of concrete testing and inspecting agency, location of concrete batch in Work, design compressive strength at 28 days, concrete mixture proportions and materials, compressive breaking strength, and type of break for both 7- and 28-day tests. 10. Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may be permitted by Architect but will not be used as sole basis for approval or rejection of concrete. 11. Additional Tests: Testing and inspecting agency shall make additional tests of concrete when test results indicate that slump, air entrainment, compressive strengths, or other requirements have not been met, as directed by Architect. Testing and inspecting agency may conduct tests to determine adequacy of concrete by cored cylinders complying with ASTM C 42 or by other methods as directed by Architect. 12. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements. 13. Correct deficiencies in the Work that test reports and inspections indicate dos not comply with the Contract Documents. F. The Testing Laboratory shall assess and report on floor and slab flatness and levelness according to ASTM E 1155 within 24 hours of finishing. G. Field and concrete plant inspections are to be made by a competent representative of the Testing Laboratory during all structural concreting operations including periodic audit and spot check of the Producer's and/or Contractor's quality control procedures to assure proper and adequate control. When it appears that any material furnished fails to fulfill specification requirements, the Testing Laboratory is to report such deficiency immediately to the Architect and appropriately record it in his report END OF SECTION 03 30 00