650 Reinforcing Bars, Plain or Epoxy Coated ........................... 910.01 Support Devices ................................................................. 910.01(b)11 Threaded Tie Bar Assembly ............................................... 910.01(b)2 The sizes and lengths of reinforcing bars shall be marked plainly to facilitate inspection and checking. 703.03 Bar List 20 The Contractor shall verify the quantity and size of reinforcing bars against the structure plans prior to ordering. Errors in the bar list and bending schedule will not be cause for adjustment of the contract unit price.
703.04 Protection of Materials Plain and epoxy coated reinforcing bars shall be protected from damage during
storage, handling, installation and conc rete placement. Plain and epoxy coated reinforcing bars shall not be stored in direct contact with the ground. Epoxy coated reinforcing bars shall be protected from exposure to ultraviolet light and moisture during storage. Once placed into the work, epoxy coated reinforcing bars shall not be 30 exposed to ultraviolet light for more than 21 days prior to placement of concrete. At the time of concrete placement, reinforcing bars shall be free of dirt, loose rust or scale, grease, oil, or other foreign substance. If the Engineer suspects the epoxy coating has been damaged by exposure to ultraviolet light, a sample will be obtained and will be tested in accordance with 910.01(b)9. Damage to the epoxy coating of epoxy coated reinforcing bars shall be repaired or the bars shall be replaced. Repairs to the epoxy coating shall be performed on all damaged areas larger than 1/4 by 1/4 in. A bar will be rejected if the accumulated area of damaged coating exceeds 2% of the nominal surface area of the bar or if the total 40 area of repaired coating exceeds 5% of the nominal surface area of the bar. All damaged areas shall be cleaned and the re pair shall be performed before visible oxidation appears. Coating repair material shall be in accordance with 910.01(b)9. CONSTRUCTION REQUIREMENTS
703.05 Bending Reinforcing bars required to be bent sh all be accurately cold bent in a bending
machine to the shapes shown on the plans. All bars in which cracks or splits occur at bends will be rejected. 50
703.06 Placing and Fastening Reinforcing bars shall not be ordered for piers or bents to be founded on soil or rock until the foundation conditions have been investigated. The bottom elevations of
such footings will then be determined. Written permission will then be given to order such reinforcing bars. Sufficient excavatio n and all necessary soundings shall be made as directed so that exact bottom elev ations of footings may be determined. 703.03 651 All dimensions shown on the plans for spacing of reinforcing bars apply to centers of bars unless otherwise noted. All bars sh all be accurately placed and, during placing 60 of the concrete, held firmly in the position as shown on the plans. Distances from the forms shall be maintained by means of chairs, ties, hangers, or other approved support devices. All reinforcing bars shall be wired rigidly or fastened securely at sufficient intervals to hold the bars in place. Epoxy co ated reinforcing bars shall be tied with epoxy coated or plastic coated tie wire. Chairs and supports holding upper layers of reinforcing bars shall support the transverse bars. The upper layer and lower layer of reinforcing bars in RCBAs and bridge floors shall be tied or fastened at a minimum of every other intersection of the longitudinal and transverse bars to prevent an upward or a lateral movement of a bar from the planned position. 70 Layers of reinforcing bars shall be separated by spacers. Reinforcing bars shall be separated from horizontal surfaces by be ing suspended or supported on approved chairs and spacers capable of supporting the designed loads. Supports and spacers shall be of such shape as to be easily encased in concrete. That portion which is in contact with the forms shall be non-corrosive and non-staining material. They shall be of an approved type. Vertical stirrups shall always pass around main tension members and shall be securely attached thereto. The use of pebbles, pieces of broken stone or bricks, metal pipe, wooden blocks, and similar devices for holding bars in position will not be allowed. After being placed, reinforcing bars will be inspected and approved before the concrete is deposited. The positions of the re inforcing bars shall not be disturbed both during and after depositing the concrete. All concrete placed in violation of this requirement may be rejected and its remova l will be required. Where reinforcing bars project from construction joints, all mortar clinging to the reinforcing bars from previous pours shall be removed before the next enveloping pour is made. All reinforcing bars shall be furnished in the full lengths shown on the plans unless splices are indicated. No other splicing will be allowed except with written permission. Unless otherwise shown on the plans, reinforcing bars shall be lapped 32 diameters to 90 make a splice. Construction joints shall not be made within the limits of lapped bars. For lapped splices, reinforcing bars shall be placed in contact and rigidly clamped or wired in an approved manner. Insofar as possible, splices shall be staggered and well distributed or located at points of low tensile stress. Splices will not be allowed at points where the section does not provide a distance of at least 2 in. between the splice and the nearest adjacent bar or surface of the concrete. When splicing is indicated or allowed, an appropriate splice system on the QPL of Reinforcing Bar Splicing Systems may be used in lieu of lapped bars. The splicing system shall be installed in accordance with the manufacturer’s recommendations. If 100 an offset splicing system is selected, it shall only be used on spiral, hoop, or ring-type reinforcement. 703.06 652 WWR, when required, shall be placed as shown on the plans or as otherwise directed. The sheets shall overlap sufficiently to maintain uniform strength and shall be securely fastened at lapped ends and edge s. The laps shall be no less than one mesh in width. Spiral reinforcement, consisting of evenly spaced continuous spirals, shall be held firmly in place by attachment to vertical reinforcement. Th e spirals shall be held true 110 to line by vertical spacers. Anchorage for sp iral reinforcement shall be provided with 1 1/2 extra turns of the spiral rod or wire at each end of the spiral un it. Splices in spiral rods or wire shall be made with a lap of 1 1/2 turns. Threaded tie bar assemblies may be used in lieu of spliced reinforcing bars shown on the plans. Threaded tie bar assemblies shall achieve the minimum strength in accordance with 910.01(b)2. The Contractor sh all coat any exposed part of threaded bar assemblies in accordance with 910.01(b)2.
703.07 Method of Measurement 120
Reinforcing bars will be measured by the pound based on the theoretical number of pounds complete in place as shown on the plans or placed as ordered. The quantities of materials furnished and placed shall be based upon the calculated weights of the reinforcing bars actually pl aced in accordance w ith these specifications. The weights calculated shall be based upon the following table: Bar Designation No. Weight per linear foot, pounds Bar Designation No. Weight per linear foot, pounds 1/4 in. 0.167 8 2.670 3 0.376 9 3.400 4 0.668 10 4.303 5 1.043 11 5.313 6 1.502 14 7.65 7 2.044 18 13.60 Threaded tie bar assemblies will be measured by the number of assemblies placed. WWR will not be measured. 130
703.08 Basis of Payment
The accepted quantities of reinforcing bars will be paid for at the contract price per pound, complete in place. If the substitution of reinforcing bars larger than those specified is allowed, payment will be made for only that weight which would be required if the specified bars had been used. 703.07 653 If the use of reinforcing bar lengths shorter than those shown on the plans is 140 allowed for convenience in transporting or placing the bars, payment will be based on the weight of the lengths shown on the plans. Payment for threaded tie bar assemblies will be at the contract unit price per each, complete in place. If epoxy coating is speci fied, payment for the assemblies will be at the contract unit price per each for thr eaded tie bar assembly, epoxy coated. Payment will be made under: Pay Item Pay Unit Symbol 150 Reinforcing Bars ........................................................................ LBS Reinforcing Bars, Epoxy Coated ............................................... LBS Threaded Tie Bar Assembly ...................................................... EACH Threaded Tie Bar Assembly, Epoxy Coated ............................. EACH The cost of metal chairs, spacers, clips, wire, or other mechanical means used for fastening or holding reinforcement in place, and laps shall be included in the cost of reinforcing bars. The cost of coating materials and repair of damaged or removed coating materials on reinforc ing bars and on metal chairs, spacers, clips, or other 160 mechanical means used for fastening or holding reinforcement in place, and laps shall be included in the cost of epoxy coated reinforcing bars. If threaded tie bar assemblies are used in lieu of spliced reinforcing bars as shown on the plans, the cost of such assemblies shall be included in the cost of reinforcing bars. If WWR is required, the cost of furnishing and placing shall be included in the cost of the concrete in which it is placed.