SECTION 03410

STRUCTURAL PRECAST CONCRETE

PART 1 GENERAL

SECTION INCLUDES

Columns and bearing saddles.

Beams, spandrels, girders, and purlins.

Floor [[single] [double] [quad] 'T's.] [channel slabs.] [inverted 'T' beams.]

Grout packing.

Connection [and supporting] devices.

Lintels[.] [and bond beams.]

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [_____-__________]: Placement of anchorage [and connection] devices.

Section [_____-__________]: Placement of lintels[.] [and bond beams.]

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [_____-__________]: Anchorage devices for [____________________.]

Section [_____-__________]: Recessed reglets for

[____________________.]

RELATED SECTIONS

Section [_____-__________]: Foundation concrete work.

Section 03300 - Cast-in-Place Concrete: Concrete topping[.] [and reinforcement.]

Section 03347 - Self-Levelling Underlayment.

Section 03366 - Post Tensioned Structural Concrete.

Section 03415 - Precast Concrete Hollow Core Planks.

Section 03450 - Architectural Precast Concrete.

Section 03470 - Tilt-up Precast Concrete.

Section 03521 - Insulating Concrete Fill.

Section 07900 - Joint Sealers: Calking of butt joints of precast units at [exposed underside of floor members.] [____________________.]

Section [_____-__________]: Exterior applied finish.

REFERENCES

ACI 301 - Structural Concrete for Buildings.

ACI 318 - Building Code Requirements for Reinforced Concrete.

ANSI/AWS D1.1 - Structural Welding Code - Steel.

ANSI/AWS D1.4 - Structural Welding Code - Reinforcing Steel.

ASTM A36 - Structural Steel.

ASTM A153 - Zinc Coating (Hot-Dip) on Iron and Steel Hardware.

ASTM A416 - Uncoated Seven-Wire Stress-Relieved Strand for Prestressed Concrete.

ASTM A615 - Deformed and Plain Billet-Steel Bars for Concrete Reinforcement

ASTM A666 - Austenitic Stainless Steel, Sheet, Strip, Plate, and Flat Bar for Structural Applications.

ASTM C150 - Portland Cement.

PCI MNL-116 - Manual for Quality Control for Plants and Production of Precast and Prestressed Concrete Products.

PCI MNL-120 Design Handbook - Precast and Prestressed Concrete.

PCI MNL-123 - Manual on Design of Connections for Precast Prestressed Concrete.

PCI MNL-124 - PCI Design for Fire Resistance of Precast Prestressed Concrete.

UL - Underwriter's Laboratories.

DESIGN REQUIREMENTS

Size components to withstand design loads in a [restrained] [unrestrained] condition as follows:

Horizontal Assembly: [___] lb/sq ft ([___] kPa) live [and dead] loads.

Vertical Assembly:[___] lb/sq ft ([___] kPa).

Maximum Allowable Deflection: [1/180] [1/240] [1/360] [____] span.

Design members exposed to the weather to provide for movement of components without damage, failure of joint seals, undue stress on fasteners, or other detrimental effects when subject to seasonal or cyclic day/night temperature ranges.

Design system to accommodate construction tolerances, deflection of other building structural members, and clearances of intended openings.

Calculate structural properties of framing members in accordance with [ACI 301.] [ACI 318.]

SUBMITTALS

Submit shop drawings under provisions of Section [01300.] [01340.]

Submit shop drawings indicating layout, unit locations, fabrication details, [unit identification marks,] reinforcement, connection details, support items, dimensions, openings, and relationship to adjacent materials[.] [, and sealed by a Professional Structural Engineer.]

Indicate design loads, deflections, cambers, bearing requirements, and special conditions.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating standard component configurations, design loads, deflections, cambers, and bearing requirements.

Submit samples under provisions of Section [01300.] [01340.]

Submit [two] [___] samples [___x___] inches ([___x___] mm) in size illustrating surface finish treatment.

Submit fabricator's installation instructions under provisions of Section [01300.] [01340.]

Submit design data under provisions of Section [01300.] [01340.]

Submit design data reports indicating calculations for loadings and stresses of fabricated, designed framing.

QUALITY ASSURANCE

Perform Work in accordance with the requirements of PCI MNL-116, PCI MNL-123, and PCI MNL-120.

QUALIFICATIONS

Fabricator: Company specializing in manufacturing the work of this Section with minimum [three] [___] years [documented] experience.

Erector: Company specializing in erecting the work of this Section [with [___] years [documented] experience][.] [and] [approved by fabricator].

Design precast concrete members under direct supervision of a Professional Structural Engineer experienced in design of this work and licensed [at the place where the Project is located.] [in the State of [____________________].]

Welder: Qualified within previous [12] [___] months in accordance with ANSI/AWS D1.1 and ANSI/AWS D1.4.

REGULATORY REQUIREMENTS

Conform to [ACI 318 and] [applicable] [__________] code for design load and construction requirements applicable to work of this Section.

Conform to [[UL] [__________] Assembly Number [_____]] [PCI MNL-124] to achieve [___] hour rating for [floor] [roof] assembly.

[Submit reviewed shop drawings and support design to [State] [__________] authority for approval.]

PRE-INSTALLATION CONFERENCE

Convene a conference [one] [___] week prior to commencing work of this Section, under provisions of Section [01200.] [01220.]

Instruct others when field cutting required openings 10 inches (250 mm) and smaller.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Handle precast members in position consistent with their shape and design. Lift and support only from support points.

Lifting or Handling Devices: Capable of supporting member in positions anticipated during manufacture, storage, transportation, and erection.

Protect members to prevent staining, chipping, or spalling of concrete.

Mark each member with date of production and final position in structure.

SEQUENCING AND SCHEDULING

Sequence work under the provisions of Section [01005.] [______.]

Schedule work under the provisions of Section [01310.] [_____.]

Coordinate work under provisions of Section [01005.] [01040.] [01041.]

Coordinate the work of framing components not pretensioned but associated with the work of this Section.

PART 2 PRODUCTS

FABRICATORS

[__________________________________] Product [__________.]

Other acceptable fabricators offering equivalent products.

[_____________________________] Product [__________.]

[_____________________________] Product [__________.]

[_____________________________] Product [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MATERIALS

Cement: [White] [Grey] [Buff] Portland, conforming to ASTM C150, Type I or III.

Aggregate, Sand, Water, Admixtures: Determined by precast fabricator as appropriate to design requirements[.] [and PCI MNL-116.]

REINFORCEMENT

Tensioning Steel Tendons: ASTM A416, Grade 250K or 270K, of sufficient strength commensurate with member design.

Reinforcing Steel: ASTM A615, deformed steel bars.

Coating: [Galvanize] [Epoxy coat] [__________] reinforcement to resist [__________] corrosion.

ACCESSORIES

Connecting and Supporting Devices: [ASTM A36 carbon steel] [ASTM A666 stainless steel] plates, angles, [items cast into concrete,] [or] [items connected to steel framing members,] and inserts, conforming to [PCI MNL-123] [__________]; [prime painted.] [hot-dip galvanized in accordance with ASTM A153.] [electroplated.] [unfinished.] [Do not paint surfaces in contact with concrete or surfaces requiring field welding.]

Grout: [Non-shrink] [Non-metallic], [ferrous] [non-ferrous]; minimum yield strength of [10,000] [__________] psi ([68.9] [____] MPa) at 28 days.

****** [OR] ******

Grout:	Thermo-setting epoxy.

Bearing Pads: [High density plastic, [1/8] [___] inch ([3] [___] mm) thick, smooth both sides.] [Vulcanized elastomeric compound molded to size.] [Neoprene (Chloroprene).] [Tetrafluoroethylene (TFE).] [___________.]

Bolts, Nuts, and Washers: [High strength steel type recommended for structural steel joints.] [Quenched and tempered alloy steel type.] [Corrosion resistant chromium-nickel type.]

Prime Paint: Zinc rich alkyd type.

FABRICATION

Fabrication procedure to conform to PCI MNL-116.

Maintain plant records and quality control program during production of precast members. Make records available upon request.

Ensure reinforcing steel, anchors, inserts, plates, angles, and other cast-in items are embedded and located as indicated on [shop drawings.] [Drawings.]

Tension reinforcement tendons as required to achieve design load criteria.

Provide required openings with a dimension larger than [10] [8] inches ([250] [200] mm) and embed accessories provided by other Sections, at indicated locations.

Exposed Ends at Stressing Tendons: Fill recess with [[non-shrink] [__________]] [epoxy] grout, trowel flush.

FINISHING

Ensure exposed-to-view finish surfaces of precast concrete members are uniform in color and appearance.

Cure members under identical conditions to develop required concrete quality, and minimize appearance blemishes such as non-uniformity, staining, or surface cracking.

Finish members to PCI MNL-116 [Commercial] [Standard] [Finish B] [Finish A] grade.

****** [OR] ******

Plant Finish (Finish A): Normal plant finish; surface may contain small surface holes caused by air bubbles, minor chips, or spalling at edges or ends, without major discoloration.

****** [OR] ******

Exposed-to-View Finish (Finish B): Normal plant finish with fins and protrusions removed, ground edges and ends, and flat face surfaces.

****** [OR] ******

Architectural Finish (Finish C): Surface holes or bubbles over 1/4 inch (6 mm) filled with matching cementitious paste, fins or protrusions removed and surface ground smooth.

****** [OR] ******

Rubbed Finish (Finish D): Surface holes or bubbles over 1/4 inch (6 mm) filled with matching cementitious paste, fins or protrusions removed and surface ground smooth, surface then rubbed with neat cementitious paste to smooth and even color and texture.

****** [OR] ******

Sandblast Finish (Finish E): Light sandblast to achieve [__________] exposure of aggregate.

TOLERANCES

Conform to [PCI MNL-116.] [__________.]

****** [OR] ******

Maximum Variation From Nominal Dimension: [1] [___] inch ([25] [___] mm).

Maximum Variation From Intended Camber: [5/8] [___] inch ([15] [___] mm).

Maximum Out of Square: [1/8] [___] inch/10 feet ([3] [___] mm/3 m), non-cumulative.

Maximum Misalignment of Anchors, Inserts, Openings: [1/8] [___] inch ([3] [___] mm).

Maximum Bowing of Members: Length of Bow/ [360.] [___.]

TESTS

Provide [testing] [and] [analysis] of stressing tendons under provisions of Section [01400.] [01410.]

Test samples in accordance with applicable ASTM standard.

PART 3 EXECUTION

EXAMINATION

Verify that site conditions are ready to receive work and field measurements are as [shown on [shop drawings.] [Drawings.]] [instructed by the fabricator].

Beginning of installation means installer accepts existing conditions.

PREPARATION

Prepare support equipment for the erection procedure, temporary bracing, and induced loads during erection.

ERECTION

Erect members without damage to structural capacity, shape, or finish. Replace or repair damaged members.

Align and maintain uniform horizontal and vertical joints, as erection progresses.

Maintain temporary bracing in place until final support is provided. Protect members from staining.

Provide temporary lateral support to prevent bowing, twisting, or warping of members.

Adjust differential camber between precast members to tolerance before final attachment.

Level differential elevation of adjoining horizontal members with grout to maximum slope of [1:12.] [_____.]

Set vertical units dry, without grout, attaining joint dimension with lead or plastic spacers.

Grout [underside of [column] [and] [beam] bearing plates][.]

[and] [joints between members at [roof] [and] [floor]	lo ca ti on s. ]

Secure units in place. Perform welding, in accordance with ANSI/AWS D1.1.

ERECTION TOLERANCES

Erect members level and plumb within allowable tolerances.

Conform to [PCI MNL-116.] [____________________.]

****** [OR] ******

Design and erect to the following tolerances:

Maximum Variation from Plane or Location Indicated on Drawings: 1/4 inch/10 feet and 3/8 inch in 100 feet (6 mm/3 m and 9 mm in 30 m), non-cumulative.

Maximum Offset from True Alignment Between Members: [1/4] [___] inch ([6] [___] mm).

Maximum Variation From Dimensions [Indicated on Reviewed [Shop Drawings] [Drawings]]: Plus or minus [1/8] [___] inch ([3] [___] mm).

Exposed Joint Dimension: [3/8] [___] inch ([9] [___] mm) plus or minus 1/4 inch (6 mm).

When members cannot be adjusted to conform to design or tolerance criteria, cease work and advise Architect/Engineer. Execute modifications as directed.

PROTECTION

Protect members from damage caused by field welding or erection operations.

Provide non-combustible shields during welding operations.

CLEANING

Clean weld marks, dirt, or blemishes from surface of exposed members.

SCHEDULE

_ITEM	LOCATION	NOMINAL	NOMINAL FINISH

DEPTH	WIDTH

Single 'T's	Penthouse Roof	20 inches	24 inches	A

Double 'T's	Main Roof	24 inches	48 inches	E

Double 'T's	Typical Floor	24 inches	24 inches	C

Framing Beams	As Detailed	24 inches	10 inches	B

Framing Beams	As Detailed	30 inches	10 inches	B

Columns	As Detailed	-	-	B

END OF SECTION