PART 1 GENERAL
1.1   SUMMARY

1. (Section includes: To be determined by Architect/see drawings.)
   1. Architectural precast concrete panels, trim, roof edge, copings, lintels, base course, wall caps, heads and sills.
   2. Supports, anchors, and attachments.
   3. Grouting under panels.
   4. Colored pointing mortar at precast concrete.
2. Related Sections:
   1. Section 03300 - Cast-in-Place concrete: Building structural frame.
   2. Section 04200 - Unit Masonry: Back-up masonry.
   3. Section 05120 - Structural Steel: Building structural frame.
   4. Section 07900 - Joint Sealers: Perimeter and intermediate joint sealants and backing.

1.2   REFERENCES

1. ANSI/ACI 301 - Specifications for Structural Concrete for Buildings.
2. ANSI/ACI 318 - Building Code Requirements for Reinforced Concrete.
3. ASTM A36 - Structural Steel.
4. ASTM A185 - Welded Steel Wire Fabric for Concrete Reinforcement.
5. ASTM A307 - Carbon Steel Externally Threaded Standard Fasteners.
6. ASTM A386 - Zinc Coating (Hot-Dip) on Assembled Steel Products.
7. ASTM C143 - Test for slump of Portland Cement Concrete.
8. ASTM C150 - Portland Cement.
9. ASTM C260 - Air-Entraining Admixtures for Concrete.
10. AWS D1.1 - Structural Welding Code.
11. ASTM A325 - High Strength Bolts for Structural Steel Joints
12. ASTM A615 - Deformed and Plain Billet-Steel Bars for Concrete Reinforcement.
13. ASTM C33 - Concrete Aggregates.
14. PCI Manual for Structural Design of Architectural Precast Concrete.
15. PCI MNL-117 - Manual for Quality Control for Plants and Production of Architectural Precast Concrete Products.

1.3   SYSTEM DESCRIPTION

Members and connections to backup and supports to withstand own weight, design loads due to pressure and suction of wind, and live and dead loads.

1.4   SHOP DRAWINGS

1. Submit shop drawings in accordance with Section 01300.
2. Indicate locations, fabrication details, unit identification marks,.reinforcement, connection details, dimensions, and relationship to adjacent materials. Provide erection drawings.
3. Shop drawings signed and sealed by professional Engineer registered in State of Minnesota.

1.5   SAMPLES

1. Submit samples in accordance with Section 01300.
2. Submit 2 samples ( 8" X 8" ) illustrating surface finish and texture.

1.6   QUALITY ASSURANCE

1. Design members and connections to backup and supports under direct supervision of professional engineer experienced in design of precast concrete units, registered in State of Minnesota.
2. Conform to requirements of PCI Manual for Structural Design of Architectural Precast Concrete and ANSI/ACI 318.
3. Precast Manufacturer and Erectors: Qualified in accordance with PCI MNL-117.
4. Welding: ANSI/AWS D1.1.
5. Manufacture, Transportation, and Installation: Company specializing in providing architectural precast concrete and services associated with precast concrete construction with architectural finishes.

1.7   DELIVERY, STORAGE AND HANDLING

1. Transport, handle, store, and protect in accordance with manufacturer's recommendations.
2. Handle precast members to position, consistent with their shape and design. Lift and support only from support points.
3. Lifting or Handling Equipment: Capable of maintaining units during manufacture, storage, transportation, erection, and in position for fastening.
4. Blocking and Lateral Support During Transport and Storage: Clean, non-staining without causing harm to exposed surfaces. Provide temporary lateral support to prevent bowing and warping.
5. Protect edges of members to prevent staining, chipping, or spalling of concrete.
6. Mark units with date of production and final position in structure, in location not visible to exterior view.

PART 2 PRODUCTS
2.1   ACCEPTABLE MANUFACTURERS

1. Gage Brothers Concrete Products.
2. American Artstone.
3. Spancrete - Midwest.

2.2   CONCRETE MATERIALS

1. Cement: ASTM C150, Portland Type I or III - normal white color.
2. Concrete Materials: ASTM C33; water and sand.
3. Reinforcing Steel: ASTM A615, deformed steel bars; plain uncoated finish, any reinforcing located within 1 1/2" of the outside exposed surface to have a galvanized finish.
4. Air Entrainment Admixture: ASTM C260.
5. Surface Finish Aggregate: Clean, washed, angular limestone in color as selected to match sample at Architect's Office, from single source throughout Work; conforming to ASTM C33.
6. Pigment: Resistant to alkalis.
7. Grout: Non-shrink, minimum 10,000 psi 28 day strength.

2.3   SUPPORT DEVICES

1. Connecting and Support Devices: ASTM A36 weldable steel.
2. Bolts, Nuts, and Washers: ASTM A370; high strength steel.
3. Primer: zinc rich oil alkyd.

2.4   ACCESSORIES

1. Bearing Pads: Tempered hardboard 1/8 inch thick, smooth both sides.
2. Sealant: Same type specified in Section 07900-Joint Sealers

2.5   MIX

1. Concrete: Minimum 5000 psi 28 day strength, air entrained in accordance with ANSI/ACI 301.

2.6   MORTAR

1. As specified in Section 04100-Mortar and Masonry Grout. Use Type S mortar at precast concrete. For colored pointing mortar, aggregates and mortar pigment shall be selected to match sample.

2.7   FABRICATION

1. Maintain plant records and quality control program during production of precast units. Make records and access to plant available to Architect upon request.
2. Use rigid molds, constructed to maintain precast unit uniform in shape, size, and finish.
3. Maintain consistent quality during manufacture.
4. Embed reinforcing steel, anchors, inserts, plates, angles, and other cast-in items as indicated on shop drawings.
5. Fabricate connecting devices, plates, angles, (items fit to steel framing members,) inserts, bolts, and accessories. Fabricate to permit initial placement and final attachment.
6. Locate hoisting devices to permit removal after erection.
7. Cure units to develop concrete quality, and to minimize appearance blemishes such as non-uniformity, staining, or surface cracking
8. Identify each precast unit with corresponding code on erection drawings, in location not visible in finish work.

2.8   FINISH - PRECAST UNITS

1. Ensure exposed-to-view finish surfaces of precast units are uniform in color and appearance.
2. Remove cement mortar from areas affected by aggregate retarder as instructed by surface retarder manufacturer.
3. Sand blasted, acid etched, exposed aggregate and/or honed finish on exposed-to-view precast surfaces as selected by Architect. Protect adjacent surfaces.

PART 3 ERECTION
3.1   INSPECTION

1. Verify building structure, anchors, devices, and openings are ready to receive work of this section.
2. Beginning of installation means acceptance of existing condition.

3.2   PREPARATION

1. Provide for erection procedures and induced loads during erection. Maintain temporary bracing in place until final support is provided.
2. Erect members level and plumb within allowable tolerances.
3. Align and maintain uniform horizontal and vertical joints as erection progresses.
4. Fasten and weld units in place. Perform welding including tack welds, in accordance with ANSI/AWS Dl.l.
5. Touch-UP field welds and scratched or damaged primed painted (galvanized) surfaces.
6. Set vertical units dry, without grout, attaining joint dimensions with lead or plastic spacers. Grout pack base of unit.
7. Rake out joints 3/4 inch deep before mortar sets to allow for pointing mortar. Brush clean raked mortar joints. Clean face of precast concrete after raking. After mortar is set, wet raked joints thoroughly and force pointing mortar into joints.
8. Neatly tool Joint surface to profile indicated or tool slightly concave.

3.4   TOLERANCES

1. Variation from Plane of Location: 1/4 inch in 10 feet and 3/8 inch in 100 feet maximum, noncumulative.
2. Offset from True Alignment Between Two Connecting Members: 1/4 inch maximum.
3. Out of Square: 1/8 inch in 10 feet maximum, noncumulative.
4. Variation in Dimensions Indicated on Shop Drawings: Plus or minus 1/8 inch.
5. Misalignment of Anchors, Inserts, Openings: 1/8 inch
6. Bowing of Units: Length of bow/360.
7. Exposed Joint Dimension: - 3/8 inch plus or minus 1/4 inch.

3.5   PROTECTION

1. Protect members from damage.
2. Provide noncombustible shields during welding operations.

3.6   CLEANING

1. Clean exposed facings to remove dirt and stains which may be on units after erection and completion of joint treatments. Wash and rinse in accordance with precast manufacturer's recommendations. Protect other work from damage due to cleaning operations. Do not use cleaning materials or processes which could change character of exposed concrete finishes.