SECTION 805 - REINFORCEMENT
805.01 Description. This work consists of furnishing and placing steel reinforcement for
bridges in accordance with these specifications and in reasonably close conformity with the dimensions, bending, spacing, and other requirements shown on the plans.
805.02 Materials. Materials used shall conform to the requirements of Section 711.
Supports for bar reinforcement shall meet the requirements of Subsection 711.02.7.
805.02.1 Order Lists. Before ordering reinforcement, all order lists and bending
diagrams shall be furnished by the Contractor for the approval of the Engineer, and no materials shall be ordered until the lists and bending diagrams have been approved. All expense incident to the revision of material furnished in accordance with such lists and diagrams to make it comply with the design drawings shall be borne by the Contractor.
805.03 Construction Requirements.
805.03.1 Protection of Material. Steel reinforcement shall be protected at all times from
damage. Damaged material will not be approved for use in the work. When placed in the work and immediately prior to placing the c oncrete, the reinforcement shall be free from dirt, oil, paint, grease, and other foreign substances and shall be free of loose or thick rust or millscale that could impair bond of the steel with the concrete.
805.03.2 Fabrication. Bent bar reinforcement shall be cold bent to the shapes shown on
the plans, and unless otherwise provided on the plans or by authorization, bends shall be made in accordance with Subsection 711.02. Bars partially embedded in concrete shall not be field bent except as shown on the plans or permitted. Bar reinforcement shall be bundled, tagged and marked in accordance with Code of Standard Practice of the Concrete Reinforcing Steel Institute.
805.03.3 Placing and Fastening. Reinforcement shall be accurately placed in the
positions shown on the plans and firmly held during the placing and setting of concrete. Bars shall be tied at all intersections. Where spacing is less than one foot in each direction, alternate intersections shall be tied. Distances from the forms shall be maintained by means of stays, blocks, ties, hangers, or other approved supports. Blocks for holding reinforcement from contact with the forms shall be precast mortar blocks of approved shape and dimensions or metal chairs, reference Subsection 711.02.7. Layers of bars shall be separated by precast mortar blocks or by other equally suitable devices. The use of pebbles, pieces of broken stone or brick, metal pipe, and wooden blocks will not be permitted. The clear distance between parallel bars, except in columns and between multiple layers of bars in beams, shall not be less than the nominal diameter of the bars, 1 1/3 times the maximum size of the coarse aggregate, nor one inch. Where reinforcement in beams or girders is placed in two or more layers, the clear distance between layers shall not be less than one inch , and the bars in the upper layers shall be placed directly above those in the bottom layer. In spirally reinforced and in tied columns, the clear distance between longitudinal bars shall not be less than 1½ times the bar diameter, 1½ times the maximum size of the coarse aggregate, nor 1½ inches. The clear distance between bars shall also a pply to the clear distance between a contact splice and adjacent splices or bars. Reinforcement in any member shall be inspected and approved by the Engineer before the placing of concrete begins. Concrete placed in violation of this provision may be rejected and removal and replacement of concrete and reinforcement required. If fabric reinforcement is shi pped in rolls, it shall be strai ghtened into flat sheets before being placed.
805.03.4 Splicing of Bars. All reinforcement shall be furnished in the full lengths
indicated on the plans. Exce pt when shown on th e plans, Splicing of bars will not be permitted without the written approval of the Engineer. Splices shall be staggered insofar as possible. The minimum distance to the surface of the conc rete shall be as specified on the plans. Reinforcement shall not be welded except if detailed on th e plans or if authorized by the Engineer in writing. Welding shall conf orm to the current AWS specifications for Recommended Practices for Welding Reinforcement Steel, Metal Inserts, and Connections in Reinforced Concrete Construction.
805.03.5 Lapping of Mesh or Mats. Sheets of mesh or bar mat reinforcement shall
overlap each other sufficiently to maintain a uniform strength and shall be securely fastened at the ends and edges. The edge lap shall not be less than one mesh in width.
805.03.6 Substitutions. Substitutions of different size ba rs will be permitted only with
specific authorization by the En gineer. If steel is substitu ted, it shall have an area equivalent to the design area or larger.
805.03.7 Epoxy Coated Bars.
805.03.7 1--Repair of Damaged Epoxy Coating. When required, damaged epoxy coating
shall be repaired with patching material conforming to ASTM A 775. Repair shall be done in accordance with the patching material manufacturer’s recommendations.
805.03.7 2--Handling of Epoxy Coated Bars. The Contractor shall use padded or non-
metallic slings and padded straps to protect the coated reinforcement from damage. The bundled bars shall not be dropped or dragged and must be stored on wooded cribbing. If, in the opinion of the Engineer, the coated bars or plates have been damaged as a result of the Contractor’s negligence, the material will be rejected. The Contractor may propose, for the approval of the Engineer, alternate precautionary measures.
805.03.7 3--Placing of Epoxy Coated Bars. Epoxy-coated reinforcing bars supported
from formwork shall rest on coated wire bar supports, or on bar supports made of dielectric material or other acceptable materials. Wire bar supports shall be coated with dielectric material for a minimum distance of two inches from the point of contact with the epoxy- coated reinforcing bars. In walls having reinforcing bars, spreader bars where specified by the Engineer shall be epoxy coated. Proprietary combination bar clips and spreaders used in walls with epoxy-coated reinforcing bars shall be made of corrosion resistant material. Epoxy-coated reinforcing bars shall be fastened with nylon-, epoxy-, or plastic-coated tie wire or other acceptable materials.
805.04 Method of Measurement. Steel reinforcement incorporated in bridge concrete
and accepted will be measured in pounds based on the total computed weight for the sizes and lengths of bars, mesh or mats shown on the plans or authorized . Reinforcement for box bridge concrete will be measured and paid for in accordance with Section 602. Epoxy coated reinforcement ba rs, not included in other pay items, will be measured in pounds based on the computed weight from th e theoretical weight of plain round bars of the same nominal size as shown in the table of areas and masses in Section 711. Corrosion resistant reinforcement (CCR) bars , not included in other pay items, will be measured in pounds based on the computed weight from the theoretical weight of plain
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