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I <br /> 1 6-02.3(23) Opening to Traffic I <br /> 2 This section is supplemented with the following new paragraph: <br /> 3 <br /> I <br /> 4 After curing bridge approach slabs in accordance with Section 6 02.3(11), the <br /> 5 bridge approach slabs may be opened to traffic when a minimum compressive strength <br /> 6 of 2,500 psi is achieved. <br /> 7 <br /> 8 6-02.3(24)C Placing and Fastening <br /> 9 This section is revised to read: I 10 <br /> 11 The Contractor shall position reinforcing steel as the Plans require and shall ensure that <br /> 12 the steel is set within specified tolerances. Adjustments to reinforcing details outside of <br /> 13 specified tolerances to avoid interferences and for other purposes are acceptable when <br /> 14 approved by the Engineer. <br /> 15 <br /> 16 When spacing between bars is 1 foot or more, they shall be tied at all intersections. When I <br /> 17 spacing is less than 1 foot, every other intersection shall be tied. If the Plans require <br /> 18 bundled bars, they shall be tied together with wires at least every 6 feet.All epoxy-coated <br /> 19 bars in the top mat of the bridge deck shall be tied at all intersections, however they may <br /> 20 be tied at alternate intersections when spacing is less than 1 foot in each direction and <br /> 21 they are supported by continuous supports meeting all other requirements of supports for <br /> 22 epoxy-coated bars. Other epoxy-coated bars shall also be tied at all intersections, but <br /> I <br /> 23 shall be tied at alternate intersections when spacing is less than 1 foot in each direction. <br /> 24 Wire used for tying epoxy-coated reinforcing steel shall be plastic coated. Tack welding <br /> 25 is not permitted on reinforcing steel. I 26 <br /> 27 Abrupt bends in the steel are permitted only when one steel member bends around <br /> 28 another. Vertical stirrups shall pass around main reinforcement or be firmly attached to it. <br /> 29 <br /> 30 For slip-formed concrete, the reinforcing steel bars shall be tied at all intersections and <br /> 31 cross braced to keep the cage from moving during concrete placement. Cross bracing <br /> 32 shall be with additional reinforcing steel. Cross bracing shall be placed both longitudinally I <br /> 33 and transversely. <br /> 34 <br /> 35 After reinforcing steel bars are placed in a traffic or pedestrian barrier and prior to slip- ' <br /> 36 form concrete placement, the Contractor shall check clearances and reinforcing steel bar <br /> 37 placement. This check shall be accomplished by using a template or by operating the <br /> 38 slip-form machine over the entire length of the traffic or pedestrian barrier. All clearance <br /> 39 and reinforcing steel bar placement deficiencies shall be corrected by the Contractor <br /> 40 before slip-form concrete placement. <br /> 41 I 42 Precast concrete supports (or other accepted devices) shall be used to maintain the <br /> 43 concrete coverage required by the Plans. The precast concrete supports shall: <br /> 44 <br /> 45 1. Have a bearing surface measuring not greater than 2 inches in either dimension, and <br /> 46 <br /> 47 2. Have a compressive strength equal to or greater than that of the concrete in which <br /> 48 they are embedded. I <br /> 49 <br /> 50 In slabs, each precast concrete support shall have either: (1) a grooved top that will hold <br /> 51 the reinforcing bar in place, or (2) an embedded wire that protrudes and is tied to the <br /> I <br /> I <br />