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03200 Concrete Reinforcement

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03200 Concrete Reinforcement SECTION 03200 CONCRETE REINFORCEMENT PART 1 - GENERAL 1.01 SCOPE: A. The contractor shall furnish all labor, materials and equipment to provide and properly place all concrete reinforcement steel, welded wire fabric, couplers, and concrete inserts for use in the reinforced concrete and masonry construction and all appurtenant work, including all the wires, clips, supports, chairs, spacers, and other accessories as shown on the drawings and as specified herein. 1.02 APPLICABLE PUBLICATIONS: The most recent revision of the following standard specifications shall apply to the Work of this section: A. American Concrete Institute (ACI): 1. ACI 318 - Building Code Requirements for Reinforced Concrete 2. ACI SP-66 - Detailing Manual B. American Society of Testing and Materials (ASTM): 1. ASTM A82 - Standard Specification for Steel Wire, Plain, for Concrete Reinforcement 2. ASTM A185 - Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete 3. ASTM A555 – Standard Specification for General Requirements for Stainless Steel Wire and Wire Rods 4. ASTM A615 - Standard Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement 5. ASTM A775 - Standard Specification for Epoxy-Coated Reinforcing Steel Bars 6. ASTM A955/A955M – Standard Specification for Deformed and Plain Stainless Steel Bars for Concrete Reinforcement C. Concrete Reinforcing Steel Institute (CRSI): 1. Recommended Practice for Placing Reinforcing Bars D. Florida Building Code, Latest Edition 1.03 DEFINITIONS: (Not Used) 1.04 SUBMITTALS: The Contractor shall submit the following: A. Mill Certifications of Grade 60 reinforcing steel or stainless steel, as required B. Complete bar schedule, bar details and erection drawings in conformance with ACI SP-66 C. Where mechanical couplers are required or permitted to be used to splice reinforcement steel, the CONTRACTOR shall submit manufacturer's literature which contains instructions and recommendations for installation for each type of coupler used; certified test reports which verify the load capacity of each type and size of coupler used; and Shop Drawings which show the location of each coupler with details of how they are to be installed in the formwork. D. Mill certificates shall be delivered with each shipment of reinforcing bars. 1.05 QUALIFICATIONS: (Not Used) Spec. Standard: 08/31/07 03200-1 Revision: 08/31/07 1.06 RESPONSIBILITIES: A. The CONTRACTOR shall perform Pull tests to 50 percent of five percent of drilled dowels, randomly selected by the DISTRICT. If any tested dowels slip or yield, an additional five percent of drilled dowels shall be tested until an entire five percent sample is tested without slipping or yielding. 1.07 FACTORY TESTING: 1.08 CERTIFICATIONS: A. International Code Council Evaluation Service (ICC-ES) Certifications for mechanical couplers, if allowed B. Mill Certifications of Grade 60 reinforcing steel 1.09 INSPECTION COORDINATION: A. The CONTRACTOR shall provide sufficient notice and opportunity to the DISTRICT to review the placement of the reinforcing steel before the concrete is placed. The CONTRACTOR shall provide access to the WORK for the DISTRICT as requested for inspection. The Contractor shall provide 48 hours notice of its intention to begin new WORK activities. 1.10 WARRANTY: A. The MANUFACTURER shall warrant the EQUIPMENT, MATERIALS and PRODUCTS specified in this section against defective materials and workmanship with the MANUFACTURER’S standard warranty, but for no less than one year from the date of Substantial Completion, and as described in Article 13 of Section 00700 - General Terms and Conditions. B. The CONTRACTOR shall warrant the WORK against defects for one year from the date of Substantial Completion and as described in Article 13 of Section 00700 - General Terms and Conditions. PART 2 - PRODUCTS 2.01 REINFORCING BARS: A. Metal reinforcement shall be deformed type bars conforming to ASTM A615, Specifications for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement, Grade 60, unless otherwise specified. Reinforcing steel shall be fabricated for the shapes and dimensions indicated on the Drawings and in compliance with ACI 318. All bars shall be bent cold. B. Replace all reinforcement with bends and kinks not shown on fabrication shop drawings. Remove from job site all such reinforcing and replace with new fabricated steel. Field bending of reinforcement at the work site is prohibited. C. Welded wire fabric reinforcement shall conform to the requirements of ASTM A185, and the details indicated. Do not use fabric that has been rolled. Install flat sheets only. D. Spiral reinforcement shall be cold-drawn steel wire conforming to the requirements of ASTM A82. E. Mechanical couplers shall be provided where indicated and where approved by the DISTRICT. The couplers shall develop a tensile strength that exceeds 125 percent of the yield strength of the reinforcement bars being spliced at each splice. Where the type of coupler used is composed of more than one component, all components required for a complete splice shall be provided. This shall apply to all mechanical splices, including those splices intended for future connections. Reinforcement steel and coupler used shall be compatible for obtaining the required strength of the connection. Straight threaded type couplers shall require the use of the next larger size reinforcing bar or shall be used with Spec. Standard: 08/31/07 03200-2 Revision: 08/31/07 reinforcing bars with specially forged ends which provide upset threads which do not decrease the basic cross section of the bar. F. Epoxy for grouting reinforcing bars shall be specifically formulated for such application, for the moisture condition, application temperature, and orientation of the hole to be filled. Epoxy grout shall meet the requirements in SECTION 03600 Grout. 2.02 ACCESSORIES: All chairs and bolsters shall conform to ACI SP-66 and the CRSI Manual of Standard Practices and shall have galvanized or plastic legs. EXECUTION 2.03 PLACEMENT AND ANCHORAGE: A. Bar supports shall be spaced in accordance with CRSI. 1. Reinforcement steel shall be supported by concrete, plastic or metal supports, spacers or metal hangers that are strong and rigid enough to prevent any displacement of the reinforcement steel. Where concrete is to be placed on the ground, supporting concrete blocks (or dobies) shall be used in sufficient numbers to support the bars without settlement, but in no case shall such support be continuous. Concrete blocks used to support reinforcement steel shall be tied to the steel with wire ties that are embedded in the blocks. For concrete over formwork, the CONTRACTOR shall provide concrete, metal, plastic, or other acceptable bar chairs and spacers. 2. Limitations on the use of bar support materials shall be as follows. a. Concrete Dobies: permitted at all locations except where architectural finish is required. b. Wire Bar Supports: permitted only at slabs over dry areas, interior non-hydraulic wall surfaces, and exterior wall surfaces. c. Plastic Bar Supports: permitted at all locations except on grade. B. Reinforcement shall be accurately placed in accordance with the Drawings and shall be adequately secured in position with not less than 16-gauge annealed wire. The placement tolerances shall be in accordance with ACI 318, paragraph 7.5, Placing Reinforcement and the CRSI Manual of Standard Practices. C. Tie wires shall be bent away from the forms in order to provide the required concrete coverage. D. Bars additional to those indicated which may be found necessary or desirable by the CONTRACTOR for the purpose of securing reinforcement in position shall be provided by the CONTRACTOR at its own expense. E. Additional reinforcement around openings: 1. Place an equivalent area of steel around pipe or opening and extend on each side and top and bottom sufficiently to develop bond in each bar. 2. Refer to details on Drawings for bar extension length on each side of opening. 3. Where welded wire fabric is used, provide extra reinforcing using fabric or deformed bars. F. Unless otherwise indicated, reinforcement placing tolerances shall be within the limits in Section 7.5 of ACI 318 except where in conflict with the requirements of the Building Code. G. Bars may be moved as necessary to avoid interference with other reinforcement steel continuously across the entire width of the reinforcement mat, and shall support the reinforcement mat in the plane indicated. Spec. Standard: 08/31/07 03200-3 Revision: 08/31/07 H. Welded wire fabric placed over the ground shall be supported on wired concrete blocks (dobies) spaced not more than 3 feet on centers in any direction. Welded wire fabric shall not be placed on the ground and hooked into place in the freshly placed concrete. I. Welded wire fabric reinforcement placed over horizontal forms shall be supported on slab bolsters. Slab bolsters shall be spaced not more than 30 inches on center. The construction practice of placing welded wire fabric on the ground and hooking it into place in the freshly placed concrete shall not be used. 2.04 CONCRETE COVER: A. The concrete cover over reinforcement shall conform to ACI 318, paragraph 7.7, Concrete Protection for Reinforcement, unless otherwise indicated. Tie wires shall be bent away from the forms in order to provide the required concrete coverage. 2.05 SPLICING: A. All lap splices of bar reinforcement shall be as indicated and conform to Chapter 12 of ACI 318 or as otherwise approved by the DISTRICT. Unless otherwise indicated, dowels shall match the size and spacing of the spliced bar. B. Laps of welded wire fabric shall be in accordance with ACI 318. Adjoining sheets shall be securely tied together with No. 14 tie wire, one tie for each two running feet. Wires shall be staggered and tied in such a manner that they cannot slip. C. Splices in column spiral reinforcement, when necessary, shall be made by a lap of 1-1/2 turns.
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