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   PART 1 - GENERAL

    01 SECTION INCLUDES

    A. Precast floor and roof planks.

    B. Grout packing.

    C. Connection and supporting devices.

    02 REFERENCES

    A. ACI 301 - Structural Concrete for Buildings.

    B. ACI 318 - Building Code Requirements for Reinforced Concrete.

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

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

    E. ANSI/ASTM A185 - Welded Steel Wire Fabric for Concrete Reinforcement.

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

    G. ANSI/ASTM A497 - Welded Deformed Steel Wire Fabric for Concrete Reinforcement.

    H. ASTM A36 - Structural Steel.

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

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

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

    L. ASTM C150 - Portland Cement.

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

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

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

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

    Q. UL - Underwriters Laboratories.

    1.02 DESIGN REQUIREMENTS

    A. Size components to withstand design loads as shown on the Drawings.

    B. Maximum Allowable Deflection: 1/240 span.

    C. 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.

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

    E. Calculate structural properties of framing members in accordance with ACI 318.

    1.03 SUBMITTALS

    A. Submit the following in accordance with Section 01340.

    B. Shop Drawings: Indicate 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 registered in the State of Tennessee.

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

    D. Product Data: Indicate standard component configurations, design loads, deflections, cambers, and bearing requirements.

    E. Design Data: Submit design data reports indicating calculations for loadings and stresses of fabricated, designed framing. Sealed by P.E.

    1.04 QUALITY ASSURANCE

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

    1.05 QUALIFICATIONS

    A. Fabricator: Company specializing in manufacturing the work of this section with minimum three years documented experience.

    B. Erector: Company specializing in erecting the work of this section with 3 years documented experience approved by manufacturer.

    C. Design precast concrete members under direct supervision of a Professional Structural Engineer experienced in design of this work and licenced in the state where the project is located.

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

    1.06 REGULATORY REQUIREMENTS

    A. Conform to ACI 318 code for design load and construction requirements applicable to work of this section.

    1.07 PRE-INSTALLATION CONFERENCE

    A. Convene a pre-installation conference one week prior to commencing work of this section.

    B. Instruct others when field cutting required openings 10 inches and smaller.

    1.08 DELIVERY, STORAGE, AND HANDLING

    A. Deliver, store, protect and handle products to site under provisions of Section 01610 and 01620.

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

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

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

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

    03 COORDINATION

    A. Coordinate the work of framing components not pre-tensioned but associated with the work of this section.

   PART 2 - PRODUCTS

    04 MATERIALS

    A. Cement: Gray Portland, conforming to ASTM C150 Type I or III.

    B. Aggregate, Sand, Water, Admixtures: Determined by precast fabricator as appropriate to design requirements and PCI MNL-116 and in compliance with ASTM C33 or C330.

    C. Admixtures:

    1. Air Entraining Admixtures: ASTM C260.

    2. Water Reducing, Retarding, Accelerating, High Range Water Reducing Admixtures: ASTM C494.

    05 REINFORCEMENT

    A. Tensioning Steel Tendons: ASTM A416 (including supplement) Grade 250k or 270k.

    B. Reinforcing Steel:

    1. Deformed Billet Steel: ASTM A615.

    2. Deformed Rail Steel: ASTM A611.

    3. Deformed Axle Steel: ASTM A617.

    4. Deformed Low Alloy Steel: ASTM A706.

    B. Welded Steel Wire Fabric: ASTM A185 Plain Type in flat sheets, unfinished.

    2.02 ACCESSORIES

    A. Connecting and Supporting Devices: ASTM A666 stainless steel angles, items cast into concrete or items connected to steel framing members, inserts, conforming to PCI MNL-123. Do not paint surfaces in contact with concrete or surfaces requiring field welding.

    B. Grout: Non-shrink, minimum yield strength of 10,000 psi at 28 days.

    C. Bearing Pads:

    1. Plastic: Multi-monomer plastic strips shall be non-leaching and support construction loads with no visible overall expansion.

    2. Tetraflouroethylene (TFE) reinforced with glass fibers and applied to stainless or structural steel plates.

    D. Bolts, Nuts and Washers: High strength steel type recommended for structural steel joints.

    E. Prime Paint: Zinc rich alkyd type.

    F. Welded Studs: Conform to A.W.S. D1.1.

    2.03 FABRICATION

    A. Fabrication procedure to conform to PCI MNL-116.

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

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

    D. Tension reinforcement tendons as required to achieve design load criteria.

    E. Openings: Primarily on thin sections, the manufacturer shall provide for those openings 10 inches round or square or larger as shown on the structural drawings. Other openings shall be located and field drilled or cut by the trade requiring them after the precast, prestressed products have been erected. Openings shall be approved by Architect/Engineer before drilling or cutting.

    F. Exposed Ends at Stressing Tendons: Fill recess with non-shrink grout, trowel flush.

    G. Core Hole End Plugs: Cardboard insert and concrete fill.

    H. Sill Seal: Compressible glass fiber strips.

    2.04 FINISHES

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

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

    C. Finishes:

    1. Standard Underside: Resulting from casting against approved forms using good industry practice in cleaning of forms, design of concrete mix, placing and curing. Small surfaces holes caused by air bubbles, normal color variations, normal form joint marks, and minor chips and spalls shall be tolerated, but no major or unsightly imperfections, honeycomb, or other defects shall be permitted.

    2. Standard Top: Result of vibrating screed and additional hand finishing at projections. Normal color variations, minor indentations, minor chips and spalls shall be permitted. No major imperfections, honeycomb, or defects shall be permitted.

   PART 3 - EXECUTION

    06 EXAMINATION

    A. Verify that site conditions are ready to receive work and field measurements are as shown on shop drawings.

    07 PREPARATION

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

    08 ERECTION

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

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

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

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

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

    F. Install bearing pads.

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

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

    I. Grout underside of column and joints between members at roof and floor locations.

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

    09 ERECTION TOLERANCES

    A. Erect members level and plumb within allowable tolerances.

    B. Design and erect to the tolerances in PCI Design Handbook, Chapter 8.

    C. Exposed Joint Dimension: 3/8 inch plus or minus 1/4 inch.

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

    010 PROTECTION

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

    B. Provide non-combustible shields during welding operations.

    011 CLEANING

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

    END OF SECTION