SIC(TION 03300 -(ASTVIN-PLACE ('ONC REEF

PART] - (ilNERAI,

1 .1 R ELATED D)OCUMENT1S

A. Drawings and general provisions of the Contract, including General and SupplementaryConditions and Division 1. Specification Sections, apply to this Section.

1 .2 SUMMARY

A. This Section specifies cast-in place concrete, including forinwork, reinforcemnent, concretematerials, mix design, plaement procedures, and finishes.

B3. Furnish and install expanding bentonite-based waterstop as specified herein, Illustrated onproject drawings, or as required to complete the work to comply with waterproofing warrantyrequiremrents ini Section 7.

C. Related Sections include the following:

1. Division 2 Section "Earthwork" for drainage fill under slabs-on-grade.2. Division 2 Section "Concrete Sidewalk" for concrete pavement and walks.3. Division 7 Section " Waterproofing" for additional waterp~roofing requirements.

1.3 DEFINITIONS

A. Cemnentitious Materials: Portland cement alone or in combination with one or more of blendedhydraulic cemenit, fly ash and other pozzolans, ground granulated blast-furniace slag, and silicafumne.

1.4 SUBMITTALS

A. Product Data: For each type of manufactured material and product indicated.

13. Design Mixes: For each concrete mix. Include alternate mix designs when characteristics ofmaterials, project condlitions, weather, test results, or other circumstances warrant adjustments.Do not start concrete production until data has been reviewed and approved by the engineer.

C. Steel Reinforcement Shop Drawings: Details of fabrication, bending, and placement, preparedaccording to ACI 315, "Details and Detailing of Concrete Reinforcement." iclude material,grade, bar schedules, stirrup spacing, bent bar diagrams, arrange inent, and supports of concretereinforeement. Include special reinforcement required for openings through concrete structures.

1). Welding Certificates: Copies of'certificates for welding procedures and personnel.

V Material Test Reports: From a qualified testing agency indicating and interpreting test resultsfor compliance of the following with requirements indicated, based on comprehensive testing ofcurrent materials:

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11. Material (Ceriticates: Signed by manufacturers certifying thai each of' the fbi lowing itemnscom1plies WithI requi rC1 lCnt S:

1'. Cernentitious materials and aggregates.2. Formn materials and lbrrn-rei case agents.3. Steel reinforcement and reinforement accessories.4. Admixtures.5. Curing materials.6. Floor and slab treatments.7. Vapor retardlers.S. E-lpoxy joint filler.9. Joint-filler strips.10. Repair mnaterials.II . Form liners12. Reglcts1 3. Vapor retarder/hairier

1.5 QUALITY ASSURANCE

A. Installer Qualifications: An experienced installer who has completed concrete Work similar inmaterial, design, and extent to that indicated for this Project and whose work has resulted inconstruction with a record of successful in-service performance.

B. Professional Engineer Qualifications: A professional engineer who is legally qualified topractice in jurisdiction where Project is located and who is experienced in providingengineering services of the kind indicated. Engineering services arc defined as those performedfor formwork and shoring and reshoring installations that are similar to those indicated for thisProject in material, design, and extent.

C. Manufacturer Qualifications: A firm experienced in manufacturing ready-mnixed concreteprodlucts comaplying with ASTM C 94 requirements for production facilities and equipment.

1 . Manufacturer must be certified according to the National Ready Mixed ConcreteAssociation's Certification of Ready Mixed Concrete Production Facilities.

D. Testing Agency Qualifications: An independent testing agency, acceptable to authorities havingjurisdiction, qlualified according to ASTM C 1077 and ASTM E 329 to conduct the testingindicated, as documented according to ASTM E 548. Contractor shall provide a storage box forconcrete cylinders.

I. Personnel conducting field tests shall be qualified as ACT Concrete Field I estingLTechnician, Grade 1, according to ACI ('P-I or an equivalent certification program,

F. Source [imitations: Obtain each type or class of'cementitious material of the same brand. fromthe same iranufaiitUrer's plant, each aggregate from one source, and each admixture fromn thesame manufacturer.

F. Welding: Qnalify procedures and personnel according to AWS Dl1.4, "Structural WeldingCodc--Reinforci an Steel."

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GAI Publiceat ions: Com ply with the following, unless mrorestringent provisions are indlicated:

1I AU]1 301, "'Specificationi for Structural C oncrete.''2. AC!I 17. "Spccifleations for olerances for Concrete Construction and Materials." C('1

I1. Preinstallation Conferene: Conduct conference at Project site to comply with requirements inDivision I Section "Project Meetings."

I . efore submitting design mixes, review concrete mix design and examine procedures foren)suring quality of concrete materials. Require representatives of each entity directlyconcerned with cast-in-place concrete to attend, including the following:

a. Contractor's superintendent.b. Independent testing agency responsible for concrete design mixes.c. Ready-mix concrete producer.(d. Cioncrete subcontractor.

1. Cast in place Concrete Waterstop: Concrete cold joits will require a bentonite waterstop asshown on typical drawing details.

I., Adhesion: Waterstop-RX is not a self-adhering product. Cetseal is required to secureWaterstop-RX. No other adhesive should be used. Mechanical fasteners can be used inconjunction with Cetseal adhesive, but should not be used solely to secure the waterstop.

2. Istallation Instructions: Comaponents and installation procedures shall be in accordancewith current manufacturer's printed specifications and recommendations. Verify technicaldata submittals are the most current with manufacturer - (847)851-1800.

3. Expansion Joinits: WATERSTOP-RX is not designed, nor intended for waterproo fing- orsealing expansion joints. Responsibility of waterproofing expansion joints is of others

1.6 1)111VERY, STORAGE, AND HANDLING

A. Deliver, store, and handle steel reinforcement to prevent bending and damage.

PART 2 - PRODUCTS

2.1 FORM -F ACING MATE RIALS

A. Smnooth-Formed Finished Concrete: Formi-facing panels that will provide continu ous.: true, andsmooth concrete surfaces. Furnish in largest practicable sizes to minimize number of Joints.

I Plywood, metal, or othcr approved pan~el materials.2. xterior-grade plywood panels,. suitable for concrete forms, complying with DOC' PS I,

and as follows:

a. I-igh-density overlay, Class 1, or better.

B. Chamifer Strips: Wood, metal, PVC, or rubber strips, 3/4 by 3/4 inch (19' by P ) imm), minimum.

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C. Formn-Release Agent: ( oniniiecMilly tormulahted formi-release agent that will not bond with.stailn, or adversely affect conecrctc surfaccs and will not im1pair subsequent treatments ofconcrete SUrf'aces

I . l'ormtilate form-release agent with ruist inhibitor for steel formn-facing mnaterials.

1). Form Tics: Factory- fa bri cated, removable or snap-offi meal. or glass-liber-reiniforced plasticform ties designed to resist lateral pressure of fresh concrete on forms and to prevent spalling ofconcrete on removal.

I.Furnish units that will leave no corrodible iiietal closer thian I inch (t '5 mm) to the planeof the exposed concrete surface.

2. Furnish ties that, when removed, wvill leave holes not larger than 1 ]ich (25 ini) indiameter in concrete surface.

3. Futrnish ties with integral water-barrier plates to walls indicated to receive damrpproofingor waterproofing.

2.2 STEE_ L R"INJFORCEMIINT

A. Reinforcing Bars: ASTM A 615, (Grade 60, deformned.

13. Plain-Steel Welded Wire Fabric: ASTM A 185, fabricated from as-drawn steel wire into flatsheets.

2.3 RINFORCEMENT IACCESSOR IES

A. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fasteningreinforcing bars and welded wire fabric in place. Manufacture bar supports according to CRSI's'Manual of Standard Practice" fromn steel wire, plastic, or precast concrete or fiber-reinforcedconcrete of greater compressive strength than concrete, and as follows:

1. For concrete surfaces exposed to view where legs of wire bar supports contact formis, useCRSI Class I plastic-protected or CRSI Class 2 stainless-steel bar supports.

B3. Jloint Dowel Bars: Plain-steel bars, ASTM A 615/A 615M, Grade 60. Cut bars true to length

with ends square and free of burrs.

C. All hooks, unless otherwise noted, shall con form to "ACT Standard I looks".

1). 'lie-wire shall not he less than 16 gauge wire

2.4 CONCRETE MATERIALS

A. Portland Cement: AS'IM C 1501, lIype f11.

B. Normal-Weight Aggregate: ASIM C 33, uniformly graded, and as follows:

I1. Nomninal Maximum Aggregate Size: 3114 Inch.

C. F7ly Ash : ASTM ('618, Type F

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D). Water: Potable and complying withi ASi M C 94.

2.5 ADMIXTFURES

A. General: Admixtures certified by manufacturer to contain not more than 0.1 percent Water-soluble chloride ions by mass of cementitious mnaterial andl to be compatible withi otheradmixtures and cementitious materials. Do not use adm-ixiures containing calcium chloride.

13. Air-Entraining Adixture: AS4 M C 260.

C. Water-Reducing Admixture: ASIM C 494,T'ype A.

D. Hligh-Range, Water-Reducing Admixture: ASTM C 494, Type F'.

I'- Water-Reducing and Accelerating Admixture: ASTM C 494, Type E.

F. Water-Reducing and Retarding Admixture" ASTM C 494, Type D).

2.6 VAPOR BARRIER SYSTEM

A. Vapor Barrier System: ASTM E 1745, Class A, polyolefin sheet, not less than 10 mil.

B. Fine-Graded Granular Material: Clean mixture of crushed stone, crushed gravel, andmanufactured or natural sand; ASTM D 448, Size 10, with 100 percent passing a No. 4 sieveand 10 to 30 percent passing a No. 100 sieve; meeting deleterious substance limits ofASTM C 33 for fine aggregates.

C. Granular Fill: Clean mixture of crushed stone or crushed or uncrushed gravel-, ASTM D 448,Size 57, with 100 percent passing a 1-1/2-inich sieve and 0 to 5 percent passing a No. 8 sieve.

2.7 BliNTONITE WATERSTOPS

A. Provide Waterstop-RX bentonite waterstop and Ceiscal adhesive as mnanufaetured by ColloidEnvironmental Technologies Company (CETCO), 2870 Forbs Ave, Hoffman Estates, IL, 60192,USA. Phone: (847) 851-1800; Fax: (847) 851-1899; Web-site: http://www.eico.com.

13. Waterstop shall consist of sodium bentonitc and butyl rubber compound formed into uniformcoils.

C. NSF Certified: Benitonite waterstop shall be certified by NSF International to conformn to therequirements of NSF' Standard 61 -- Drinking Water System Components -I lealth) Effects.

D. WATFRSTOP-RX 10 1: 1" x 3/4" x 168'" rolls of a flexible strip of bentonite and butyl rubbercompound for use in concrete construction joints - not designed for expansion joints,

E. WATESTOP-RX 1011T: 1-1/4" x 1/2" x 20" trapezoidal rolls of flexible strip of bentonte andbutyl rubber compound with a reinforcing poly scrim- for use in concrete construction joints -

not designed for expansion joints.

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I .WATJ ERSIOP-EZX 102: 3/4" x 3/8' x 33'4" rolls ot Ilexible strip ol hciitonitc aind butyl rubbercomnpound tor ulse in concrete constructi on j oints -not designed l'or expansion Ij oints

Gi. (1TT"SEAL A multipurpose UNV stable single component poly'etlliei Inoisure euirc sealant/adihesive.

2.8 CUJRINGi MA~l' IAILS

A. Absorpitive Cover: AASIITO M 1 82, Class 2, burlap clothi made from jute or kenaf, weighing

approxim-ately 9 oz./sq. yd. dry.

B. Moisture-Retaining Cover: ASTMN C 171, polyethylene film or white burl ap-pol yethylenesheet.

C. Water: Potable.

ID. Clear, Solvent-IBorne, Membrane-Forming Curing Compound: ASIM C 309,Jlype 1, ('lass B.

B1. (Clear, Waterborne, Membrane-Fonnaing Curing Compound: ASTM ('309, Type 1, ('lass B.

I. Available Products: Subject to compliance with requirements, products that may beincorporated into the Work include, but are not limited to, the following:

(G. Products: Subject to compliance with requirements, provide one of the following:

1 . Evaporation Retarder:

a. Sure Film; Dayton Superior Corporation.b. Bucobar; Euclid Chemical Co).c. B-Con; L&M Construction Chemicals, Inc.cf. Confilm; Master Builders, Inc.e. Waterhold; Metalerete Industries.f Rich Film: Richmond Screw Anchor Co.g. SikaFihIm; Sika Corporation.h. Finishing Aid; Symons Corporation.

2. Clear, Solvent-Borne, Membrane-Formrling, Curing Cormpo imd:

a. Nitocure S; Fosroc.b. Cure & Seal 309; Kaufman P~roducts Inc.e. L&M Dress & Seal 18; L&M Construction (Chemicals, Inc.d. ('S-309; W. R. Meadows, Inc.e. Seal N Kure; Metalerete Industries.f. Rich Seal 14 p~ercent INV; Richmond Screw Anchor Co.g. Kure-N-Seal; Sonnebomn, Div. of ChemRex, Inc.h1. Clear Seal 150; Tamms Industries C'o., Div. of LaPorte (Construction Chemicals of

North America, Inc.

3. (Clear, Waterborrne, Memrbrane-Form-ing Curing Comp)ound:

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N. Safe Cure and Seal; D ayton Superior C orporation.1). Aqua Cure VOX, I.Euclid ( heiical (Co.C. Dress & Seal W13, L&M C'onstruction Ch1ciials, Inc.di. Vocomrp-20.- W. R. Meadows, Inc.c. Meteure, Metalcrele Industries.f'. Cure & Seal 150UE, Nox-Crete Products Giroup, Kinsman Corporation.9. Cure & Seal 14 percent F', Symons Corporation.I1. Seal Cure W13 1 50; 1'ammrs Industries Co., IDiv. of LaIlorte Construetion

Chemicals of North America, Inc.

2.9 RELATED) MATERIALS

A. Joint-Filler Strips: ASTM D 175 1, asphalt-saturated cellulosic fiber.

B. Epoxy Joint Filler: iwo-component, semirigid, 100 percent solids, epoxy resin with a Shore Ahardness of 80 per ASTM D 2240.

C. Bonding Agent: ASTM C 1059, Type 11, non-redispersible, acrylic emulsion or styrenebutadiene.

D. Epoxy-Bonding Adhesive: ASTM C 881, two-component epoxy resin, capable of humid curingand bonding to damp surfaces, of class and grade to suit requirements, and as follows:

I . Type 11, non-load bearing, for bonding freshly mixed concrete to hardened concrete.2. Types I and 11, non-load bearing, for bonding hardened or freshly mnixed concrete to

hardened concrete.3. Types IV and V, load bearing, for bonding hardened or freshly mixed concrete to

hardened concrete.

I-. 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.

F. Dovetail Anchor Slots: Hot-dip galvanized steel sheet, not less than 0.0336 inch thick, withbent tab anchors. Temporarily fill or cover face opening of slots to p~revent intrusion ofconcrete or debris.

2.10 REPAIR MATERIALS

A. Repair Underlayment: Cemnrt -based, pol ymer-niodi lied, self-I cycling produnet that can beapplied in thicknesses from 1/8 inch and that can be feathered at edges to match adjacent floorelevations.

1. Cemnent Binder: ASTM C 150, portland cement or hydraulic or blended hydrauliccement as defined in ASTM C 219.

2.Primer: Product of underlayment muanufacturer recomnmended for substrate, conditions,and application.

3. Aggregate: Well-graded, washed gravel, 1/8 to 1/4 inch or coarse sand as recommirendedby underlaymnrt manufacturer.

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4. Comipressive Strength: Not less than 4100 psi at 28 days when tested according to

ASTIM (C 109/C 1091\1

13. R epair Topping: 'Iraffic-bearing, cemnent-based, polyinr-lrn(i ticd, sci I-leveling product that

can lbc applied in thicknesses fromn 1/4 inch.

I Cemnent B~inder: ASTM C 1 50, portland cement or hydraulic or blended hydrauliccemrent as defined in AS'l'N C 219.

2. Primer: Product of' topping manutfacturer recommuended for substrate, conditions, a1ndapplication.

3. Aggregate: Well-graded, washed gravel. 1/8 to 1/4 inch or coarse sand as recomminendedby topping Mann1 fact urer.

4. Compressive Strength: Not less than 5700 psi at 28 days when tested accordling toAS'YM C 109/C7 109M.

2.11 CON('REfTI/ MIXES

A. Prepare design mixes for each type and strength of concrete determiined by either laboratory

trial mix or field test data bases, as follows:

1. Proportion nonnal-weight concrete according to ACI 211 .1 and ACI 301.

B. Use a qualified independent testing agency for preparing and reporting proposed mix designsfor the laboratory trial mix basis.

C. Footings and Foundation Walls: Proportion normal-weight concrete mnix as follows:1. Compressive Strength (28 D~ays): 4000 psi.2. Maximum Slump: 3 inches.3. Maximum Slump for Concrete Containing High-Range Water-Reducing Admixture: 8

inches afler admixture is added to concrete with site-verified 2- to 3-inch slump.

1). Slab-on -Grade: Proportion normal-weight concrete mix as follows:I . Compressive Strength (28 Days): 4000 psi.2. MaxiMum11 Slump: 4 inches.

E. Cemrentitious Materials: Limit percentage, by weight, of cernentitious materials other thanportland cement in concrete as follows:

1. Fly Ash:- 25 percent.

I. Maximum Watcr-(.cmentitious Materials Ratio: 0.40 for concrete required to have low waterpermeability. 'This includes elevator pits and basement walls.

GI. Maximum Water-Cemientitious Materials Ratio: 0.40 for concrete exposed to deicers or subjectto freezing and thawing while moist. This includes exterior slabs and walls.

HA. Maximum Water-Cemrentitious Materials Ratio: 0.40 for corrosion protection of steelreinforcement in concrete exposed to chlorides from deicing chemicals, salt. saltwater, brackishwvater, seawater, or spray from these sources.

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1. I ax inumll Watcr4 Cenicntlitious Materials R atio: 0.40 for all interior slabs.

J,. Alr C ontent: Add air-enitraining a1dlmixturc at mnanruacturer's prescribed rate to result inlconcrete at polit of placement Ihaving anl air content as follows within a tolerance ofiplus 1 ormninus 1.5 percent, unless otherwise indhicated:

I. Air (_'outcnt; 5.5 percent for 1-1/2-inch- nominal maximum aggregate size.2. Air Content: 6 percent for I -inch- nominal maximum aggregate size.3. Air Content: 6 percent for 3/4-inch- nominal maximum aggregate size.

K. IDo not air entrain concrete to trowel-finishied interior floors and suspended slabs. D o uot allowentrapped ir content to exceed 3 percent.

L. Limit water-soluble, chloride-ion content inl hardened concrete to 0.15 percenit by weight of

cenient.

M, Admnixtures: Use admixtures according to manufacturer's written instructions.

I . Use water-reducing admixture or high-range water-reducing admixture (superplasticizer)in concrete, as required, for placement and workability.

2. Use water-reducing and retarding admixture when required by high temperatures, lowhumidity, or other adverse placement conditions.

3. Use water-reducing admixture in pumped concrete, concrete for heavy-use industrialslabs and parking structure slabs, concrete required to be watertight, and concrete with awater-cenienititious materials ratio below 0.50.

4. Use corrosion-inhibiting admixture in concrete mixes where indicated.

2. 12 FABRICATING REINFORCEMENT

A. Fabricate steel reinforcement according to CRSI's "Manual of Standard Practice."

2. 13 CONCRETE MIXING

A. Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to ASTM C 94and ASTM C 1116, and furnish batch ticket information.

I . When air temperature is between 85 and 90 deg F, reduce mixing and declivery time fromn1-1/2 hours to 75 minutes; when air temperature is above 90 deg F, reduce mixing anddelivery time to 60 minutes.

13. Project-Site Mixing: Only when specifically approved by the Architect. Measure, batch, andmix concrete materials and concrete according to ASTM C 94. Mix concrete materials inappropriate drumn-type hatch machine mixer.

1 . For mixer capacity of 1 eti. yd. or smaller, continue mixing at least one and one-halfmninutes, but not inure than five mninutes after ingredients are in mixer, before any part ofbatch is released.

2. For mixer capacity larger than 1 en. ydl., increase mixing time by 15 seconds for eachadditional 1 cu. yd..

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3. Provide batch ticket for each hatch (lischar-ed and used in the Work, indicaing l~rojecident ificat ion name and number. dlate, mix type, mnix time, quantity, and~ amnount of wateradded. Record ap~proximuate locat ion of Eil dlepositintrcue

P-ART 3 - EXIiCUTEON

3.1 FORMWORK

A. D)esign, erect, sh~ore, brace, and maintaini forinwork, according to ACI 301. to support vertical,lateral. static, and dynamic loads, and construction loads that might be applied, until concretestructure can support such loads.

B. Construct formnwork 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 A('l 347R as abrupt or gradual, as follows:

1. Class A, 1/8 inch for surfaces exposed to view.

2. Class C, 1/2 ]ich all other surfaces.

D. Construct forms tight enough to prevent loss of concrete mrortar.

E. Fabricate forms for easy removal without hammering or prying against concrete surfaces.Provide crush. or wrecking plates where stripping may damage east concrete surfaces. Providetop forms for inclined surfhees steeper than 1 .5 horizontal to I vertical. Kerf wood inserts forforming keyways, reglets, recesses, and the like, for easy removal.

1. Do not use rust-stained steel form--facing material.

F. Set edge forms, bulkheads, and intermediate screed strips for slabs to achieve requiredelevations and slopes in finished concrete surfaces. Provide and secure Units to support sereedstrips, use strike-off templates or compacting-type screeds.

G. Provide temporary openings for cleanouts and inspection ports where interior area of formworkis inaccessible. Close openings with panels tightly fited to forms and securely braced toprevent loss of concrete mnortar. L ocate temporary openings in forms at inconspicuouslocationls.

H-. Chamnfer exterior corners and edges of perlinancit ly exposed concrete.

I. IDo not chamnfer comners or edges of concrete.

J. Form openings, chases, ofisets, sinkages, keyways, reglets, blocking, screeds, and bulkheadsrequired in the Work. Determnine sizes and locations from trades providing such items.

K. Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, andother debris j ust before placing concrete.

IL. Retighten forms and bracing before placing concrete, as required, to prevent mortar leaks andmaintain proper alignment.

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Mv. (Coat contact surflaces of' forms with form-release alucrit, according to manuf~acturer's writteni

instructions, before placing rcintor nci

3.2 EMBL)DFI iEMS

A. P~lace and secure anchorage devices and oilier embedded itemns required for adjoining work thatis attached to or supported by cast- In -place concrete. Use Setting Drawings, templates.diagrams. instructions, and directions furnished with items to be emnbedded.

I. Install anchor bolts, accurately located, to elevations required,.2. Install reglets to receive top edge Of foundation sheet waterproofing and to receive

through-wall flashings in outer face of concrete frame at exterior walls, where flashing isshown at lintels, shielf angles, and other conditions.

3. Install dovetail anchor slots ini concrete structures as indicated.

3.3 REMOVING AND REUSING FORMS

A. General: Formwork, for sides of beams, walls, columrns, and similar parts of the Work, thatdoes not support weight of concrete may be removed after cumulatively curing at not less than50 deg F for 24 hours after placing concrete provided concrete is hard enough to not hedamaged by form-removal operations and provided curing and protection operations aremaintained.

B. Leave formwork, for beam soffits, joists, slabs, and other structural elements, that supportsweight of concrete in place until concrete has achieved the following:

1 . At least 70 percent of 28-day design compressive strength.

C. Clean and repair surfaces of forms to be reused in the Work. Split, frayed, delaminated, orotherwise damaged formi-facing material will not he acceptable for exposed surfaces. Applynew form-release agent.

D. 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 fonn-fs for exposed concretesurfaces unless approved by Architect.

3.4 SHORES AND RESILORIIS

A. Comrply with ACI 318, ACT 301, and recommendations in ACT 347R for design, installation,and removal of shoring and reshoring.

B. In multistory construction, extend shoring oir reshoring over a sufficient number of stories todistribute loads in such a manner that no floor or member will be excessively loaded or willinduce tensile stress in concrete members without sufficient steel reinforcement.

C. Plan sequence of removal (of shores and reshore to avoid damage to concrete. Locate andprovide adequate reshoring to supp~ort construtction without excessive stress or deflection.

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3.5 VAPOR BARRIER SYSTFM

A. Vapor Barrier System: Place, protect, and repair- vapor-barnicr slieets according toASI M F I 643 and manufacturer's written instructions. I ap joints 12 inches m1111inmum and sealwith mianuf~acturer's tape.

3.6 131 NTONIE WATERSTOP

A. Installation shall not procced when work areas are flooded or wet to the extent that would causebentomte waterstop to hydrate prior to concrete encapsulation.

13. Remove diit, dlebris, oil, grease, cemnent laitance, or othcr foreign mnatter which will impair ornegatively affect the installation of the waterstop. Protect adjacent material surfaces fromdamage or contamination from during installation operations.

C. General installation guidelinesI I nstall WATERSTOP-RX in all applicable vertical and horizontal cast-in-place conicrete

construction joints; and around applicable penetrations and strectunralI members. PlaceWATERSTO]P-RX to allow for minim-umn 3" (75 mm) concrete coverage on all sides (2"(50 mim) coverage for RX.-1 02).

2. Apply continuous bead of C+FTSEAL (typical bead diameter 3/16" (5 mm)) to dry,smooth concrete surface maintaining a minimum 3" (75 mim) depth within the concretejoint.

3. Remove release paper from coil of WATER~sTop-Rx. Firmly press the entire length ofWATEiRSTOP-RX into the CETSEAL adhesive bead; resulting in the adhesive beadspreading to coat most of the bottom of the waterstop. Verify 3" (75 mm) minimumconcrete coverage will be maintained over entire placement of waterstop. Place inmaximum practical lengths to minimize coil end joints.

4. Trightly butt coil ends together to form continuous waterstop. Do not overlap coil ends.Where required, cut coils with sharp knife or utility blade to fit coil ends together withoutoverlapping.

5. Following Steps 1-3, install waterstop around all applicable through wall pipes andmechanical penetrations; and around all applicable structural eletnents like mietal Il-Pilesthrough the slab.

6. Protect installed waterstop from prehydration prior to concrete placemrent and productencapsulation. Replace any waterstop material that exhibit significant expansion prior toconcrete encapsulation.

3.7 5 IL REINFORCEMENI

A. Gecneral: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement.

1. Do not cut or puncture vapor barrier. Repair damnage andl reseal vapor harrier beforeplacing concrete.

13. (le']an reinforcement Of loose rust and mnill. scale, earth, ice, and othier foreign materials.

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Ci Acc urately position, support, arid Secure renitfOrceinient against di splIacernent. Locate andsuppor't reinforcemnrt with bar supports to intiain ininin concrcte cover. [)o not tackweld crossing reinforcing bars.

I. Shop- or- field-weld reinforcement according to AWVS Dl ., where indicated.

1). Set wirc tics with ends directed into concrete, not toward exposed concrete surfaces.

11. Install weldled wire fabric in longest practicable lengths on bar supports spaced to minimizesagging. Lap edges and ends of' adjI.oining sheets at least one mnesh spacing. Offiset laps ofadjoining sheet widths to prevent continuous laps in either direction. Lace ov erlaps with wire.

3.8 JOINTS

A. General: Construct joints true to line with faces perpendicular to surface plane of concrete.

B. Constr-uction Joints: Install so strength and appearance of concrete are ttot impaired. atlocations indicated or as approved b~y Architect.

1. Place joints perpendicular to main reinforcement. Continue reinforcement acrossconstruction joints, unless otherwise indicated. Do not continue reinforcement throughsides of strip placements of floors and slabs.

2. Forn from preformed galvanized steel, plastic keyway-section forms, or bulkhead formswith keys, unless otherwise 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. Offsetjoints in girders a minimum distance of twice the beam width from a beam-girderintersection.

4. Locate horizontal joints in walls and columns at underside of floors, slabs, beams, andgirders 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 a bonding agent at locations where fresh concrete is placed against hardened orpartially hardened concrete surfaces.

7. Use epoxy-bonding adhesive at locations where fresh concrete is placed against hardenedor partially hardened concrete surfaces.

C. Contraction Joints in S labs-on-Grade: Form weakened-plane contraction joints, sectioningconcrete into areas as indicated. Construct contraction joints for a depth equal to at least one-third of concrete thickness, as follows:

I. Grooved Joints: Form contraction joints after initial floating by grooving andl finishingeach edge of joint to a radius of 1/8 inch. Repeat grooving of contraction joints afterapplying surface finishes. Eliminate groover tool marks on concrete surfaces.

2. Sawed Joints: Form contraetion joints with power saws equipped with shatterproofabrasive or diamond-rimmed blades. Cut 1/8-inch- wide joints into concrete as soon aspossible when cutting action will not dislodge aggregate or otherxvise damnage surfaceusually I to 2 hours depending on mix design, environmental conditions, etc. and beforeconcrete develops randomn contraction cracks, typically 1 to 2 hours depending onl mixdesign, environmental conditions, etc.

C AS 1-IN-PLACE CONCRETE 03300 - 13

SlI( I Io1()33(10 - ( ASTI-IN-TLACT7 )lS1RIll

I). Isolation J1oints in S labs-on-(irade: After rinioving toriwork, install joit-tillclr strips at. slab

junctions wi1th vertical suriics. such as colunin pedestals, f'oundation walls, gr1ade beamlns, and(

other locations, as indicated.

I xtend joint-tiller strips full widlth and depth of joint, termninating flush with finishedconcrete surface, unless otherwise indicated.

2. Terminate full-width joint-filler strips not less than 1/2 inch or more than I Inch below

finished concrete surface where joint sealants, specified in D~ivision 7 Section "JIointSealants," are indicated.

3. Install joint-filler strip~s in lengths as long as practicable. Where more than one length Isrequiredl, lace or clip sections together.

I", Dowel Joints: Install dowel sleeves and dowels or dowel bar and support assemiblies at joints

where indicated.

I. Use dowel sleeves or lubricate or asphalt-coat one-half of dowel length to preven~t

concrete bonding to one side of joint.

3.9 CO)NCRETEi PLIACEMENTJ

A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded

items is complete and that required inspections have been performed.

13. Do not add water to concrete during delivery, at Project site, or during placement, unlessapproved by Architect.

C. Deposit concrete continuously or in layers of such thickness that no new concrete will be placedon concrete that has hardened enough to cause seams or planes of weakness. If a section cannotbe placed continuously, provide construction joints as specified. Deposit concrete to avoidsegregation. Limit Free-Fall to a height of five (5) feet.

D. Deposit concrete in forms in horizontal layers no deeper than 24 inches and iii a mnanner toavoid inclined construction Joints. Place each layer while preceding layer is still p~lastic, toavoid cold joints.

I . Consolidate placed concrete with mechanical vibrating equipment. Use equipment andprocedures 4'(r consolidating concrete recommended by ACI 309R.

2. Do not use vibrators to transport concrete inside forms. Insert and withdraw vibratorsvertically at uniformly spaced locations no farther than the visible effectiveness of thevibrator. Place vibrators to rapidly p~enetrate placed layer and at least 6 inches intopreceding layer. JDo not insert vibrators into lower layers of concrete that have begun tolose plasticity. At each insertion, limit duration of vibration to timec necessary toconsolidate concrete and complete embedment of reinforcement and other embeddediteius without causing mix constituents to segregate.

I. Deposit and consolidate concrete for floors and slabs in a continuous operation. within limits of*construction Joints, until p~lacement of a panel or section is complete.

I . Consolidate concrete during lplaceirient operations so concrete is thoroughly workedaround reinforcement and other embedded items and into corners.

CAST-TN -1PLACE (CONCRETE 03300 - 14

SlEkfl( ) N 0 33 00 - CASTIN -1I1LACL( CO N\ CRFIT'

2. Maiintain reinforcement In position oin chairs dlurinig Concrete Placemnt.3. Screed slab surfaices with a straightedge and strike off to correct elevations."I. Slope surfaces uniformoly to idris where required.5. Begin initial floating using bull f'loats or (larbies to form a uniform and open-textured

surface plane, free of humps or hollows, before excess moisture or bleedwater appears, onthe surface. D~o not further disturb slab surfaces before starting finishing operations.

f., Cold-Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete work fromnphysical damnage or reduced strength that could be caused by fr-ost, freezing actions, or lowtemperatures.

1 . When air temaperature has fallen to or is expected to fall below 40 deg 1,, uniformly heatwater and aggregates before mixing to obtain a concrete maixture temperature of not lessthan 50 deg F and not more than 80 deg F at point of placement.

2. Do not use frozen materials or materials containing ice or snow. D~o not place concreteon frozen subgrade or on subgrade containing frozen materials.

3. D~o not use calcium chloride, salt, or other materials containing antif ,reeze agents orchemical accelerators, unless otherwise specified and approved in mix designs.

(G Hot-Weather Placement: Place concrete according to recommendations in ACI 305R and asfollows, when hot-weather conditions exist:

I . Cool ingredients before mixing to maintain concrete temperature below 90 deg F at timeof 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. Usingliquid nitrogen to cool concrete is Contractor's option.

2. Cover steel reinforcement with water-soaked burlap so steel temperature will not exceedambient air temperature immediately before embedding in concrete.

3. Fog-spray foims, steel reinforcement, and subgrade just before placing concrete. Keepsubgrade mroisture uniform without standing water, soft spots, or dry areas.

3.10 FINISHING FORMED SURFACES

A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holesand defective areas repaired and patched. Remove fins and other projections exceedingACI 347R limits for class of surface specified.

B. Smooth-lFormed Finish: As-cast concrete texture imp~arted by formi--facing material, arranged inan orderly and symrmetrical manner with a minimum of seams. Repair and patch tic holes anddefective areas. Remrove fins and other projections exceeding 1/8 inch in height.

1 . Apply to concrete surfaces exposed to public view or to be covered with a coating orcovering material applied directly to concrete, such as waterproofing, damlpproofing,veneer plaster, or painting.

2. Doi not apply rubbed finish to smooth-form-ed finish.

C. Rubbed Finiish: Apply the following to sniooth-lorned finished concrete:

CAST-IN\-IPIACE CONCRETE 03300 - 15

SECTlItON 03300) - (~-NP (1 OCFT

1. Smooth-Rubbed F inish: Not later thian one day after formI eimClnval, Moisten concrete

surfaces and rub with carborundlum brick or another ibrasive until producing a uni formi

color aud texture. Do not apply cemeut grout other than that created by the rubbing

process.2. Gr out-Cleaned Finish: Wet concrete surfaces and apply grout of a consistency of thick

paint to coat surfaces and fill sm-all holes. M~ix onc. part portland cement to one and one-

half parts fine sand with a 1:1 mixtuire of bonding admnixtuire and water. Add white

portland cement in amnounts determined by trial patches so color of dry grout will match

adjacent surfaces. Scrub grout into v'oids and remove excess grout. When grout whitens.rub surface with ecan burlap and keep surface damp by fog spray for at least 36 hours.

3. Cork-Floated Finish: Wet concrete surfaces and apply a stiff grout. Mix one part

portland cement and one part tine sand with a 1 :1 mixture of bonding agent. and water.Add white portland cement in amiounts determ-ined by trial patches so color of dry grout

will match adj'.acent surfaces. Compress grout into voids by grinding surface. In a

swirling mnotion, finish surface with a cork float.

D. Related Unfonined Surfaces: At tops of walls, horizontal offsets, and similar unform-ed surfaces

adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent

formed surfaces. Continue final surf ,ace treatment of formied surfaces uniformly across adjacentunformed surfaces, unless otherwise indicated.

3.11 FINISHING FLOORS AND SLAB3S

A. General: Comply with recommendations in ACI 302. 1R for screeding, restraightening, andfinishing operations for concrete surfaces. Do not wet concrete surfaces.

13. Scratch Finish: While still plastic, texture concrete Surface that has been screeded and bull-floated or darbied. Use stiff brushes, brooms, or rakes.

I . Apply scratch finish to surfaces indlicated and to surfaces to receive concrete floortopping or mortar setting beds for ceramic or quarry tile, portland cement terrazzo, andother bonded cenientitious floor finiishes.

C. Float Finish: Consolidate surface with power-driven floats or by hand floating if area is smallor inaccessible to power driven floals. Restraighten, cut down high spots, and fill low spots.Repeat float passes and restraightening until surface is left with a uniform, smooth, granulartexture.

1. Apply float finish to surfaces indicated, to surfaces to receive trowel finish, and to floorand slab surfaces to be covered withi fluid-applied or sheet waterproofing, built-up or

membrane roofing, or sand-bed terrazzo.

1). Trowel Finish: After applying float finish, apply first trowel finish and consolidate concrete byhand or power-driven trowel. (Continue troweling passes and restraighten until surface is free oftrowel marks and unifor-m in texture and appearance. Grind smooth any surface defects thatwould telegraph through applied coatings or floor coverings.

1. Apply a trowel finish to surfaces indicated and to floor aiid slab surfaces exposed to view

or to be covered with resilient flooring, carpet, ceramic or quarry tile set over a cleavage

membrane, paint, or another thin filmn-finish coating systemn

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SI-,( TIHON 03300( - CASTI-IN-I A( 1 ( '(NC I IFTl

2. Finish surfaces to the Ihilowing tolerances, me1aSLlreCl Within1 24 hour11S according toASTI F' 155/F'- 11 55NI for a randomfly traficked floor surface:

a. Specified overall values ol flatness, F(F) 25: and levelness, F(1,) 20; withimiiinium local values of flatness, F(F) 17; and levelness, F (L) 15.

F. Trowel and Fine-Broomn Fimsh: Apply a partial trowel finish, stopping after second troweling,to surfaes indicated and to surfaces where ceramic or quarry tile is to be installed by eitherthickset or thin-set method. Im-mediately alter secondl troweling, and when concrete is stillplastic, slightly scarify surface with a fine broom.

F. Broom Finish: Apply a broom finishi to exterior concrete platformns, steps, and ramps, andelsewhere as indicated.

I . Imm-nediately after float. finishing, slightly roughen trafficked surface by broomning withfiber-bristle broom p~erpendlicular to main traffic route. Coordinate required final finishwith Architect before application.

3.12 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 within-place construction. Provide other miscellaneous concrete filling indicated or required tocomplete Work.

B. Curbs: Provide monolithic finish to interior curbs where indicated by stripping forms whileconcrete is still green and by steel-troweling surfaces to a hard, dense finish with corners,intersections, and terminations slightly rounded.

3.13 CONCRETE PROTECTION AND CURING

A. General: Protect freshly placed concrete from premature drying and excessive cold or hottemperatures. Comply with ACI 306. i. for cold-weather protection and with recormmendationsin ACI 305R for hot-weather protection during curing.

B3. Evaporation Retarder: Apply evaporation retarder to unformed concrete surf'aces if hot, dry, orwindy conditions cause mnoisture loss approaching 0.2 lb/sq. ft. x h before and during finishingoperations. Apply according to manufacturer's written instructions after placing, screedinig, andbull floating or darbying concrete, but before float finishing.

C. Formed Surfaces: Cure formed concrete surfaces, including underside of beams, supportedslabs, and other similar surfaces. If forms r~emain during curing period, moist cure afterloosening forms. If removing forms before end of curing period, continue curing by one or acombination of the following methods:

1). Unformed Surfaces: Begin curing immediately after finishing concrete. C'tre uformedsurfaces, including floors and slabs, concrete floor toppings, and other surfaces, by one or acombination of the following methods:

CAST-IN-PLACE CONCRET'IE 03300 - 17

SL( I ION 03300 -CAST-IN-PLACE (CONC RETE

I Moisture Curing: Keep surfaces continuously moist lbr 1not less than seven days with thetollowing iaterials:

a1. Water.b. Continuous water-fog spray.C. Absorptivc cover, water saturated, and kept continuously wet. (over concrcte

surfaces and edges with 1 2-inch lap over adljacent absorptive covers.

2. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture-retainingcover for curing concrete, placed in widest practicable width, with sides and ends lappedat least 12 inches, and sealed by waterproof' tape or adhesive. Cure for not less thanseven days. Immediately repair any holes or tears during curi ng peiduin0oe

material and waterproof tape.

a. Moisture cure or use mroisture-retaining covers to cure concrete surfaces to receivefloor eoverings.

b. Moisture cure or use moisture-retaining covers to Cure concrete surfaces to receivepenetrating liquid floor treatments.

e. Cure concrete surfaces to receive floor coverings with either a moisture-retainingcover or a curing compound that the mianufacturer recommirends for use with floorcoverings.

3. Curing Compound: Apply uniformly in continuous operation by power spray or rolleraccording to manufacturer's written. instructions. Recoat areas subjected to heavy rainfallwithin three hours after initial application. Maintain continuity of coating and repairdamage during curing period.

4. Curing and Sealing Compound: Apply uniform-ly to floors and slabs indicated in acontinuous operation by power spray or roller according to manufacturer's writteninstructions. Recoat areas subjected to heavy rainfall within three hours after initialapplication. Repeat process 24 hours later and apply a second coat. Maintain continuityof coating and repair damage during curing period.

3.14 JOINT FILLING

A. Prepare, clean, and install joint filler according to manufacturer's written instructions.

I l. efer joint filling until concrete has aged at least six months. D~o not fill joints untilconstruction traffic has p~ermanently ceased.

13, Remove dirt, debris, saw cuttings, curing compounds, andl scalers fromn join~ts; leave contactfaces of joint clean arid diy.

C. Install semirigid epoxy joint filler full depth in saw-cut 'joints and at least 2 inches deep informed joints. Overfill joint and trim joint filler flush with top of Joint after hardening.

3.15 C'ON CRI'.E SURFACE, RFPAIRS

A. Defective Concrete: Repair and patch dlefective areas when approved by Architect. Removeand replace concrete that cannot be repaired amid patched to Architect's approval.

CAS 1'-IN-PL.ACE , CONCRET"IE 03300- 18

SR IION 03300 - CAST- IN-Pt ACI,. C( N( RYTEL

13. patching Mort ar: Mix dry -pack patching i iortar, consisting ol one part portlai R cemuent to two

and one-hall'parts Jine ag gregatc passing a No. 16 sieve, using only enough water for hanidling)

and] placing.

C. Repairing Formed Surfaces: Surface defects include color and texture liregularities, cracks.spalls, air bubbles, honeycombs, rock pockets, fins and other proj ections onl the surface, andstains and other discolorations that cannot be remroved by cleaning.

I. Immediately after formn remroval, cut out honeycombs, rock pockets, and voids more than1/2 inch in any dimension in solid concrete but not less than 1 inch in depth. Make edgesof cuts perpendicular to concrete surface. Clean, dlampen with water, and brush-coat

holes and voids with bonding agent. Ibill and compact with patching mortar beforebonding agent has dried. Fill form-tie voids with patching mortar or conec plugs securedin place with bonding agent.

2. Repair defects on surfaces exposed to view by blending white portland cement andstandard portland cetnient so that, when (try, patching mortar will match surroundingcolor. Patch a test area at inconspicuous locations to verify mnixture and color matchbefore proceeding with patching. Compact mortar in place and strike off slightly higherthan surrounding surface.

3. Repair defects on concealed fortned surfaces that affect concrete's durability andstructural performance as determined by Architect.

D. Repairing Unformed Surfaces: Test unftormred surfaces, such as floors and slabs, for finish andverify surface tolerances specified for each surface. Correct low and high areas. Test surfacessloped to drain for trueness of slope and smoothness; use a sloped template.

1. Repair finiished surfaces containing defects. Surface defects include spalls, popouts,honeycombs, rock pockets, crazing and cracks in excess of 0.01 inch wide or thatpenetrate to reinforcement or completely through unreinforced sections regardless ofwidth, 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 repairedareas to blend into adjacent concrete.

4. Correct other low areas scheduled to receive floor coverings with a repair underlayment.Prepare, mix, and apply repair underlaymnent and prim~er according to manufacturer'swritten instructions to produce a smooth, uniform, plane, and level surface. Featheredges to match adjacent floor elevations.

5. Correct other low areas scheduled to remain exposed with a repair topping. Cut out lowareas to ensure a minimum repair topping depth of 1/4 inch to match adjacent floorelevations. Prepare, tnix, and apply repair topping anid primer according tomanufacturer's written instructions to produce a smooth, uniformn, plane, and levelsurface.

6. Repair defective areas, except random crack,,s 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 3/4 inch clearance all around.D~ampen concrete surfaces in contact with patching concrete and apply bonding agent.Mix patching concrete of same materials and mix as original concrete except withoutcoarse aggregate. Place, compact, and finish to blend with adjacent finished concrete.Cure in same manner as adjacent concrete.

CAS'I -I-N-PJ ACE-, CONCRETE'b 03300- 19

S1<1 ION 0)330)0 -- ASTA-N-PLA('l. ( ON"CRELL

7. R epa ir random cracks and sinogle holes 1 inch or less in (iamet er witlh patching mortar.

(iroo\ e top of cracks aiid cut out holes to Sound concrete and clean off (dist, dirt, and

loose particles. D ampen cleanedl concrete surfaces and apply bondiiig aigcrit. Place

patching m-ortar before bonding agent has dried. Compact patching mortar and1 fiiish to

mnatch adjacent concrete. Keep patched area continuously Moist for at least 72 hours,

P.Perform structural repairs of concrete, subject to Architect's approval, uising epoxy adlhcsive and

patching mortar.

I. Repair materials and installation not specified above may be used, subject to Architect'sapproval.

3.16 FIELD QI AI ITY CONTROL

A. T esting Agency: Owner will engage and pay for a qualified independent testing and inspectingagency to sample materials, perform tests, and submit test reports (luring concrete placement.Sampling and testing for quality control may include those specified in this Article.

13. Testing Services: Testing of composite samples of fresh concrete obtained according toASTM C 172 shall be performed according to the following requirements:

1. Testing Frequency: Obtain one composite samnple for each day's pour of each concretemix exceeding 5 cu. yd., but less than 25 cu. yd., plus one set for each additional 50 cu.yd. or fraction thereof.

2. Testing Frequency: Obtain at least one comiposite sample for each 100 cu. yd. or fractionthereof of each concrete mix placed each day.

a. When frequency of testing will provide fewer than five coinpressive-strength testsfor each concrete mnix, testing shall be conducted from at least five randomlyselected batches or from each batch if fewer than five are used.

3. Slump: ASTM C 143; one test at point of placement for each composite sample, btit notless than one test for each day's pour ofl each concrete mix. Perform additional tests whenconcrete consistency appears to change.

4. Air Content: ASTM C 23 1, pressure method, for nom-ial-weight concrete; ASTM C 173,volumnetric method, for structural lightweight concrete; one test for each compositesample, but not less than one test for each day's pour of each concrete mix.

5. Concrete Temperature: ASTN4 C 1064; one test hourly when air temperatur~e is 40 (leg Fand below and when 80 deg F and above, and one test for each composite sample.

6. Uiiit Weight: ASTM C 567, fresh unit weight of structural lightwcighit concrete; one testfor each composite sample, but not less than one test for each day's pour of each concretenu x.

7. Compression lest Speclimens: ASTM C 31/C 31M; cast. and laboratory cure one set of'four standard cylinder specimens for each composite sample.

a. Cast and field cure one set of four standard cylinder specimens for each compositesainip Ic.

8. CIompressive-Strength TPests: ASTM C 39; test two lahoratory-etired speenrienis at 7 claysand two at 28 days.

CAST-IN-PLACIi CONCRETE 03300 -20

SECTiION 03300 -CAS1-1N-l1 A(TI CONCRETEF

a. c St two field-coired specitnens at 7 olays and two at 28 days.b. A cmniprcssive-strength test shiaH he the average compressiv;e st-rngth firon two

specinietis obtained from same composite samiple and tested at age indicated.

C. When strength of field-cured cylinders is less than 85 percent of coinpanilon laboratory-curedcylinders, Contractor shall evaluate operations and provide corrective procedures for protectingand curing in-place concrete.

1). Strength of eachi concrete mix will be satisfactory if every average of' any three consecutivecomipressivec-strength tests equals or exceeds specified compressive strength and nocompressive-strength test valuec falls below specified compressive strength by more than -500psi.

E. Test results shall be reported in writing to Architect, concrete manufacturer, and Contractorwithin 48 hours of testing. Reports of compressive- stren gt h tests shall contain Projectidentification name and] number, date of' concrete placement, name of concrete testing andinspecting agency, location of concrete batch in Work, design compressive strength at 28 days,concrete mix proportions and materials, comrpressive breaking strength, and type of break forboth 7-and 28-day tests.

F'. Nondestructive Testing: Impact hamnmer, sonoscope, or other nondestructive device may bepermnitted. by Architect but will not be used as sole basis for approval or rejection of concrete.

G. Additional Tests: Testing and inspecting agency shall make additional tests of concrete whentest results indicate that slump, air entrainment, compressive strengths, or other requirementshave not been met, as directed by Architect. Testing and inspecting agency may con1duct teststo determ-ine adequacy of concrete by cored cylinders complying with ASTM C 42 or by othermethods as directed by Architect.

END OF SECTION 03300

CAS Y-IN-PLACL CONCRETE 03300-21