SECTION 03 20 00 – CONCRETE REINFORCING

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SECTION 03 20 00 – CONCRETE REINFORCING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Reinforcing bars.

2. Welded wire fabric.

3. Reinforcement accessories.

B. Related Requirements:

1. Section 03 10 00 – Concrete Forming and Accessories: Form materials, waterstops, and accessories required to form cast-in-place concrete.

2. Section 03 30 00 – Cast-in-Place Concrete: Cast-in-place or in-situ concrete for structural building frame, slabs on grade, and other concrete components associated with building.

1.2 REFERENCE STANDARDS

A. American Concrete Institute:

1. ACI 301 - Specifications for Structural Concrete.

2. ACI 318 - Building Code Requirements for Structural Concrete.

3. ACI SP-66 - ACI Detailing Manual.

B. American Welding Society:

1. AWS D1.4 - Structural Welding Code - Reinforcing Steel.

2. AWS D1.4M - Structural Welding Code - Reinforcing Steel.

C. ASTM International:

1. ASTM A184 - Standard Specification for Welded Deformed Steel Bar Mats for Concrete Reinforcement.

2. ASTM A615 - Standard Specification for Deformed and Plain Carbon-Steel Bars for Con-crete Reinforcement.

3. ASTM A704 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement.

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4. ASTM A706 - Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Con-crete Reinforcement.

5. ASTM A767 - Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement.

6. ASTM A775 - Standard Specification for Epoxy-Coated Steel Reinforcing Bars.

7. ASTM A884 - Standard Specification for Epoxy-Coated Steel Wire and Welded Wire Rein-forcement.

8. ASTM A934 - Standard Specification for Epoxy-Coated Prefabricated Steel Reinforcing Bars.

9. ASTM A996 - Standard Specification for Rail-Steel and Axle-Steel Deformed Bars for Con-crete Reinforcement.

10. ASTM A1064 - Standard Specification for Carbon-Steel Wire and Welded Wire Reinforce-ment, Plain and Deformed, for Concrete.

D. Concrete Reinforcing Steel Institute:

1. CRSI 10-MSP - Manual of Standard Practice.

2. CRSI 10PLACE - Placing Reinforcing Bars.

1.3 COORDINATION

A. Section 01 10 00 – Project Summary

B. Coordinate Work of this Section with placement of formwork, formed openings, and other Work.

1.4 SUBMITTALS

A. Section 01 33 00 – Submittal Procedures: Requirements for submittals.

B. Shop Drawings:

1. Indicate bar sizes, spacings, locations, splice locations, and quantities of reinforcing steel and welded wire fabric.

2. Indicate bending and cutting schedules.

3. Indicate supporting and spacing devices.

C. Manufacturer's Certificate: Certify that products meet or exceed specified requirements.

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PART 2 - PRODUCTS

2.1 REINFORCEMENT

A. Reinforcing Steel:

1. Comply with ASTM A615A615M.

2. Yield Strength: 60 ksi.

3. Billet Bars: Deformed.

4. Finish: Uncoated.

B. Reinforcing Steel Mat:

1. Comply with ASTM A615

2. Yield Grade: 60 ksi

3. Billet Bars: Deformed

4. Finish: Uncoated

C. Stirrup Steel:

1. Comply with ANSI/ASTM A82

2. Unfinished

D. Welded Steel Wire Fabric:

1. Comply with ASTM A185 Plain Type

2. Coiled Rolls

3. Unfinished

2.2 FABRICATION

A. Fabricate concrete reinforcement according to CRSI 10-MSP.

B. Fabricate column reinforcement with offset bends at reinforcement splices.

C. Splicing:

1. If not indicated on Drawings, locate reinforcement splices at point of minimum stress.

2. Obtain approval of splice locations from Engineer.

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2.3 ACCESSORY MATERIALS

A. Tie Wire:

1. Minimum 16 gage1.6 mm, annealed type.

B. Chairs, Bolsters, Bar Supports, and Spacers:

1. Size and Shape: To strengthen and support reinforcement during concrete placement conditions.

2. Furnish load-bearing pad on bottom to prevent vapor retarder puncture.

C. Special Chairs, Bolsters, Bar Supports, and Spacers Adjacent to Weather-Exposed Concrete Sur-faces:

1. Material: Plastic-coated steel.

2. Size and Shape: To meet Project conditions.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Place, support, and secure reinforcement against displacement.

B. Do not deviate from required position beyond specified tolerance.

C. Do not weld crossing reinforcement bars for assembly except as permitted by Engineer.

D. Do not displace or damage vapor retarder.

E. Accommodate placement of formed openings.

F. Spacing:

1. Space reinforcement bars with minimum clear spacing according to ACI 318.

2. If bars are indicated in multiple layers, place upper bars directly above lower bars.

G. Maintain minimum concrete cover around reinforcement according to ACI 318 as follows:

1. Footings and Concrete Formed against Earth: 3 inches75 mm.

2. Concrete Exposed to Earth or Weather:

a. No. 619 Bars and Larger: 2 inches50 mm.

b. No. 516 Bars and Smaller: 1-1/2 inches38 mm.

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3. Supported Slabs, Walls, and Joists:

a. No. 1443 Bars and Larger: 1-1/2 inches38 mm.

b. No. 1136 Bars and Smaller: 3/4 inch19 mm.

4. Beams and Columns: 1-1/2 inches38 mm.

5. Shell and Folded Plate Members:

a. No. 619 Bars and Larger: 3/4 inch19 mm.

b. No. 516 Bars and Smaller: 1/2 inch13 mm.

H. Conform to applicable code for concrete cover over reinforcement.

I. Splice reinforcing where indicated on Drawings.

3.2 FIELD QUALITY CONTROL

A. Section 01 40 00 – Quality Requirements: Requirements for inspecting and testing.

END OF SECTION 03 20 00