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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Concrete Reinforcing <br />Project No. 180162 03 20 00 - 4 <br /> <br />3.03 SPLICING <br />A. Reinforcing steel splicing shall conform to the following: <br />1. Use Class B splice lengths in accordance with ACI 318 for all reinforcing steel bars <br />unless shown otherwise on the drawings. <br />2. For welded wire fabric the splice lap length measured between the outermost cross <br />wires of each fabric sheet shall not be less than one spacing of cross wires plus 2 <br />inches, nor less than 1.5 times the development length nor less than 6 inches. <br />3. Splices of reinforcement steel bars not specifically indicated or specified shall be <br />subject to the approval of the Owner’s Representative. Mechanical proprietary splice <br />connections may be used when approved by the Owner’s Representative or as <br />indicated on the drawings. <br />4. Welding of reinforcing steel bars is not allowed unless approved by the Owner’s <br />Representative. <br />3.04 CLEANING <br />A. Reinforcing steel bars at time of concrete placement shall be free of mud, oil, loose rust, <br />or other materials that may affect or reduce bond. Reinforcing steel bars with rust, mill <br />scale or a combination of both may be accepted without cleaning or brushing provided <br />dimensions and weights including heights of deformation on a cleaned sample are not <br />less than required by applicable ASTM standards. <br />3.05 PLACEMENT <br />A. Reinforcing steel bar placement shall conform to the following: <br />1. Uncoated reinforcing steel bars shall be supported and fastened together to prevent <br />displacement by construction loads or concrete placement. For concrete placed on <br />ground, furnish concrete block supports or metal bar supports with non-metallic <br />bottom plates. For concrete placed against forms furnish plastic or plastic coated <br />metal chairs, runners, bolsters, spacers and hangers for the reinforcing steel bar <br />support. Only tips in contact with the forms require a plastic coating. <br />2. Fasten coated reinforcing steel bars together to prevent displacement. Use plastic or <br />nylon ties to hold the coated reinforcing steel bars rigidly in place. Support coated <br />reinforcing steel bars with plastic or plastic coated chairs, runners, bolsters, spacers <br />and supports as required. <br />3. Support reinforcing steel bars over cardboard void forms by means of concrete <br />supports which will not puncture or damage the void forms nor impair the strength of <br />the concrete member. <br />4. Where parallel horizontal reinforcement in beams is indicated to be placed in two or <br />more layers, reinforcing steel bars in the upper layers shall be placed directly over <br />the reinforcing steel bars in the bottom layer with the clear distance between each <br />layer to be 2 inches unless otherwise noted on the Drawings. Place spacer <br />reinforcing steel bars at a maximum of 3’-0” on center to maintain the minimum <br />clear spacing between layers. <br />5. Extend reinforcement to within 2 inches of formed edges and 3 inches of the <br />concrete perimeter when concrete is placed against earth. <br />6. Reinforcing steel bars shall not be bent after embedding in hardened concrete unless <br />approved by the Owner’s Representative.