WORK PLANS - Laserfiche WebLink

Home Browse Search

CONCRETE REINFORCEMENT Section 03200 15-1207 The carbon equivalent (C.E.) of reinforcing bars to be welded shall be calculated from the chemical composition as shown in the mill report by the following formula: C.E. = %C + %Mn/6 + %Cu/40 + %Ni/20 + %Cr/10 - %Mo/50 - %V/10 If mill test reports are not available, chemical analysis shall be made of bars representative of the bars to be welded. ASTM A706 bars may be assumed to have a C.E. = 0.55. Bars with a C.E. above 0.75 shall not be welded. No welds shall be made on or within two (2) bar diameters of any bent portion of a bar which has been cold bent. Cost of chemical analysis, as required, will be backcharged to Contractor. B. Reinforcing supports: Galvanized metal chairs or spacers or metal hangers, accurately placed and securely fastened to steel reinforcement in place. Bottom bars in footings may be supported with concrete blocks. PART 3 - EXECUTION 3.01 FABRICATION A. Steel reinforcement shall not be bent or straightened in a manner that will injure material. Bars with kinks or bends not shown on Drawings are not permitted. Heating of bars for bending will not be permitted. Straightening or rebending will not be permitted without approval by the Structural Engineer and DSA. 3.02 INSTALLATION A. General: Reinforcement shall be accurately placed at locations indicated on the drawings within required tolerances and providing required clearances. Reinforcement shall be secured prior to placement of concrete such that tolerances and clearances are maintained. Coverage shall be in accordance with Section 1907A.7 of the CBC. Keep man on job to maintain position of reinforcing as concrete is placed. Reinforcement must be in place before concreting is begun. Install dowels as shown on drawings. Give notice whenever pipes , conduits, sleeves, and other construction interferes with placement; obtain method of procedure to resolve interference. All construction joints in concrete shall have dowels of size and spacing as shown, or as approved by Architect. B. Placing Tolerances: 1. Per ACI 301 or CRSIMCRSI Recommended Practice for Placing Reinforcing Bars, unless otherwise shown. 2. Clear distance between parallel bars in a layer shall be not less than 1", the maximum bar diameter nor 1'h times the maximum size of coarse aggregate. C. Splices: General: Unless otherwise shown on Drawings, splice top reinforcing at midspan between supports, splice bottom reinforcing at supports and stagger splices at adjacent splices whenever possible. Bar laps shall be wired together. Reinforcing steel laps shall be as follows: 3