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A. General: Comply with Concrete Reinforcing Steel L�stitute's recommended practice for <br /> "Placing Reinforcing Bars,"for details and methods of reinforcement placement and supports and as specified. <br /> 1. Avoiding cutting or puncturing vapor retarder/barrier during reinforcement placement and <br /> concreting operations. Repair damages before placing concrete. <br /> B. Clean reinforcement of loose rust and mill scale,eard�,ice,and other materials that reduce <br /> or destroy bond with concrete. <br /> C. Accurately position,support,and secure reinforcement against displacement. Locate and <br /> support reinforcing by metal chairs,runners,bolsters,spacers,and hangers,as approv�by Architect. <br /> D. Place reinforcement to maintain minimum coverages as indicated for concrete protection. <br /> Arrange, space, and securely tie bars and bar supports to hold reinforcement in position during concrete <br /> placement operations. Set wire ties so ends are directed into concrete,not towazd exposed concrete surfaces. <br /> E. Install welded wire fabric in lengths as long as practicable. Lap adjoining pieces at least <br /> one full mesh and lace splices with wire. Offset laps of adjoining widths to prevent continuous laps in either <br /> direction. <br /> 3.5 JOINTS <br /> A. Waterstops: Provide waterstops in construction joints as indicated. Install waterstops to <br /> form continuous diaphragm in each joint. Support and protect exposed waterstops during progress of Work. <br /> Field-fabricate joints in waterstops according to manufacture�"s printed instructions. <br /> B Isolation Joints in Slabs-on-Grade: Construct isolation joints in slabs-on-grade at points of <br /> contact between slabs-on-grade and vertical surfaces, such as column pedestals, foundation walls, grade <br /> beams,and other locations,as indicated. <br /> 1. Joint fillers and sealants are specified in Division 7 Section"Joint Sealants." <br /> C. Contraction(Control)Joints in Slabs-on-GTade: Const�uct contraction joints in slabs-on- <br /> grade to form panels of patterns as shown. Use saw cuts 1/8 inch wide by one-fourth of slab depth or inserts <br /> 1/4 inch wide by one-fourkh of slab depth,unless otherwise indicated. <br /> 1. Form contraction joints by inserting premolded plastic,hazdboard,or fiberboard strip into <br /> fresh concrete until top surface of strip is flush with slab surface. Tool slab edges round on <br /> each side of insert After concrete has cured, remove inserts and clean goove of loose <br /> debris. <br /> 2. Contraction joints in unexposed slabs may be formed by saw cuts as soon as possible after <br /> slab finishing as may be safely done without dislodging aggregate. <br /> 3. If joint pattem is not shown, provide joints not exceeding 15 feet in either direction and <br /> located to conform to bay spacing wherever possible(at column centerlines,half bays,third <br /> bays). <br /> 4. Joint fillers and sealants are specified in Division 7 Section"Joint Sealants." <br /> 3.6 CONCRETE PLACEMENT , <br /> A. Inspection: Before placing concrete,inspect and complete formwork installation, <br /> reinforcing steel,and items to be embedded or cast in. Notify other trades to permit installation of their work. <br /> B. General: Comply with ACI 304, "Guide for Measuring,Mixing,Transporting,and <br /> Placing Concrete,"and as specified. <br /> C. Deposit concrete continuously or in layers of such thickness that no new r.oncrete will be <br /> placed on concrete that has hazdened sufficiently to ca.use seams or planes of weakness. If a section cannot <br /> be placed continuously,provide construction joints as specified. Deposit concrete to avoid segregation at its <br /> fmal location. <br /> Page 4 of 8 <br />