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   PART 1 - GENERAL

    01 ECTION INCLUDES

    A. Non-loadbearing Architectural concrete panels and copings, cast in plant, complete with attachments for installation. The Contractor is responsible for the engineering and design of all components and materials as well as the fabrication and installation.

    02 QUALITY ASSURANCE

    A. Fabricator: Shall have a minimum of five (5) years successful experience in the fabrication of architectural precast concrete units, similar to units required for this project. Fabricator must have sufficient production capacity to produce, transport, and deliver required units without causing delay in the work.

    B. Welding: Shall be in compliance with ANSI/AWS D1.1.

    C. Welders: Shall be qualified in accordance with AWS D10.

    D. Concrete Testing: Shall be in compliance with testing provisions of Prestressed Concrete Institute Manual-117, "Manual for Quality Control for Plants and Production of Architectural Precast Concrete Products".

    03 EFERENCE STANDARDS

    A. ACI 301 - Specifications for Structural Concrete for Buildings.

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

    C. ASTM C31 - Practices for Making and Curing Concrete Test Specimens in the Field.

    D. ASTM C150 - Specifications for Portland Cement.

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

    F. AWS D1.1 - Structural Welding Code.

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

    H. ASTM C33 - Concrete Aggregates.

    I. PCI Manual for Structural Design of Architectural Precast Concrete.

    1.02 SUBMITTALS

    A. Submit the following in accordance with Section 01340.

    B. Shop Drawings: Clearly indicating:

    1. Panel fabrication details, dimensions, identification marks and locations.

    2. Location of embedded items and by whom provided.

    3. Relationship of adjacent materials.

    4. Include structural calculations.

    C. Samples: 12" x 12" in size illustrating the surface finishes.

    1.03 VISUAL MOCK-UP

    A. Provide one full-size panel from inclusion in brick mock-up panel.

    1.04 DELIVERY, HANDLING, STORAGE

    A. Delivery and Handling:

    1. Handle and deliver precast units in a position consistent with their shape and design in order to avoid excessive stresses or damage.

    2. Lift or support precast units only at the points shown on erection shop drawings.

    3. Place nonstaining resilient spacers of even thickness between each precast unit.

    4. Support precast units during shipment on nonstaining shock-absorbing material.

    5. Do NOT place precast units on ground.

    B. Storage at Jobsite:

    1. Stored precast units shall be protected from contact with soil, staining, and from physical damage.

    2. Store precast units with nonstaining, resilient supports located in same positions when transported.

    3. Store precast units on firm, level and smooth surfaces.

    4. Place the stored panels so that identification marks are readable.

   PART 2 - PRODUCTS

    04 REINFORCING MATERIALS

    A. Reinforcing Bars: ASTM A615, Grade 60, deformed.

    B. Steel Wire: ASTM A82, plain, cold-drawn, steel.

    C. Welded Wire Fabric: ASTM A185.

    05 CONCRETE MATERIALS

    A. Materials shall be in compliance with Structural Engineers design requirements.

    B. Portland Cement: ASTM C150, Type I, grey color.

    1. Use only one brand, type, and source of supply of cement throughout the project, unless otherwise acceptable to Architect.

    C. Aggregates:

    1. Coarse and Fine Aggregate for Facing Mixes: ASTM C33 for "Severe Weathering Region"; hard, durable, carefully selected and graded; free of material causing staining or reacting with cement and with less than 5% magnesium sulfate soundness loss.

    2. Aggregate from single source for the entire job.

    3. Maximum size of the course aggregate shall be 3/4".

    B. Water: Drinkable, free from injurious amounts of oil, acid, alkali, organic and other deleterious substances harmful to concrete and embedded steel.

    C. Air-Entraining Admixture: ASTM C260, minimum of 3% nor more than 6% when concrete is placed.

    2.02 CONNECTION MATERIALS

    A. Steel Plates: Structural quality, hot-rolled carbon steel, ASTM A283, Grade C.

    B. Steel Shapes: ASTM A36.

    C. Anchor Bolts: ASTM A307, low-carbon steel bolts, regular hexagon nuts and carbon steel washers.

    D. Electrodes for Welding: Comply with AWS Code.

    E. Finish of Steel Units: Exposed units hot-dip galvanized after fabrication, ASTM A153; inserts cast into precast units hot-dip galvanized, electro-galvanized or cadmium coated, others shop painted with rust-inhibitive primer.

    2.03 GROUT MATERIALS

    A. Cement Grout: Portland cement, ASTM C150, Type I, and clean, natural sand, ASTM C404. Mix at ratio of 1.0 part cement to 3.0 parts sand, by volume, with minimum water required for placement and hydration.

    2.04 CONCRETE MIX

    A. Prepare design mixes for each type of concrete required.

    1. Compressive Strength: 5,000 psi minimum at 28 days.

    2. Total Air Content: Not less than 3% nor more than 6% when concrete is placed.

    3. Water Absorption: Not to exceed 5% to 6% by weight; except between 3% to 4% for sloping surfaces (sills), for improved weathering staining resistance.

    4. Calcium chloride and other ionic compounds which are electrolytic will not be permitted in concrete mix.

    B. Specimens:

    1. Provide for test specimens for each compression test.

    2. Obtain concrete for specimens from actual production batch.

    3. 6 inch x 12 inch molded concrete cylinder meeting applicable requirements of ASTM C31 shall be used.

    2.05 JOINT MATERIALS

    A. Sealant: Of type specified in Section 07920.

    2.06 FABRICATION

    A. Manufacturing procedures shall be in general compliance with PCI Manual.-117 and ACI 318.

    1. Maintain consistent quality during manufacturing.

    B. Maintain plant records and quality control program during production of precast units.

    C. Embed reinforcing steel, anchors, inserts, plates, angles and other cast-in items as indicated on approved shop drawings.

    1. Do NOT use metal chairs in the finished face.

    D. Panel Identification:

    1. Mark each precast unit to correspond to identification marks on approved shop drawings, in a location not visible in finish work.

    2. Mark each precast unit with date cast.

    E. Cure precast units to develop concrete quality, and to minimize appearance blemishes such as non-uniformity, staining, or surface cracking.

    F. Patching:

    1. Minor patching in plant is acceptable, providing structural adequacy and appearance of units is not impaired.

    G. Surface Finish: Fabricate precast units and provide exposed surface finishes as follows and to match samples in Architects office.

    1. Smooth surface finish free of pockets, sand streaks, and honeycomb, with uniform color and texture.

    2. Back surfaces shall have a smooth float surface.

    H. Acceptance: Architectural precast units which do not meet the color and texture range or the dimensional tolerances may be rejected at the option of the Architect, if they cannot be satisfactorily corrected.

    2.07 CONCRETE TESTING

    A. Make one compression test for each day's production of each type of concrete.

    B. Specimens:

    1. Provide for test specimens for each compression test.

    2. Obtain concrete for specimens from actual production batch.

    3. 6 inch x 12 inch molded concrete cylinder meeting applicable requirements of ASTM C31 shall be used.

   PART 3 - EXECUTION

    06 ERECTION

    A. Secure panels and copings in place in accordance with approved shop drawings.

    B. Erect units without damage to shape or finish. Replace or repair damaged panels.

    C. Erect panels and copings level and plumb within allowable tolerances.

    1. Variation from Plane of Location: 1/4" in 10 feet and 3/8" in 100 feet, non-cumulative.

    2. Offset from True alignment Between Two Connecting Panels: 1/4"

    3. Out of Square: 1/8" in 10 feet, non-cumulative.

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

    C. When panels or copings require adjustment beyond design or tolerance criteria, discontinue affected work; advise Architect.

    D. Touch-up field welds and scratched or damaged galvanized surfaces.

    E. Perform welding in accordance with ANSI/AWS D1.1.

    3.02 ACCEPTANCE

    A. Protect exterior precast from edge damage at all time. Exterior precast breakage during the guarantee period will be considered a form of faulty material or workmanship unless known to result from vandalism or other causes not related to materials and workmanship.

    B. Precast concrete units which do not conform to the specified requirements, including strength, tolerances, and finishes, shall be replaced with precast units that meet the requirements of this section. The contractor shall also be responsible for the cost of corrections to any other work affected by or resulting from corrections to the precast concrete work. The amount of patching which will be permitted is subject to the approval of the Architect.

    3.03 CLEANING AND PROTECTION

    A. The Contractor shall maintain the exterior stone wall work in a reasonably clean condition throughout the construction period so that it will be without any evidence of deterioration or damage (other than the effects of normal weathering) at the time of final acceptance.

    END OF SECTION