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, � <br /> � <br /> 3,Q3 PLACING REINFORCEMENT: � <br /> Comply with Concrete Reinforcing Steel Institute's recommended practice for "Placin� � <br /> Reinforcing Bars", for details and methods of reinforcement placement and supports, and <br /> as herein specified. <br /> Avoid cutting or puncturinq vapor retarder durinq reinforcement placement and � <br /> concreting operations. <br /> Clean reinfoccement of loose rust and mill scale, earth, ice, and other materials which � <br /> reduce or destroy bond with concrete. <br /> Accurately position, support and secure reinforcement against displacement by <br /> formwork, construction, or concrete placement operations. Lxate and support ' <br /> reinforcing by metal chairs, runners, bolsters, spacers, and hangers, as required. <br /> Place reinforcement to obtain at least minimum coverages foc conctete protection. ' <br /> Arrange, space and securely tie bars and bar supports to hold reinforcement in position <br /> during concrete placement operations. Set wire ties so ends are directed into concrete, <br /> not toward exposed concrete surfaces. <br /> Install welded wire fabric in as long lengths as practicable. Lap adjoining pieces at least � <br /> one full mesh and lace splices with wire. Offset end laps in adjacent widths to prevent <br /> continuous laps in either direction. � ' <br /> 3.�I1'�70INTS: <br /> Construction Joints: Locate and install constcuction joints as indicated or, if not � <br /> indicated, locate so as not to impair strenqth and appearance of the structure, as <br /> acceptable to Architect. <br /> Provide keyways at least 1-1/2" dcep in construction joints in walls, slabs and between ! <br /> walls and footings; accepted bulkheads designed for this purpose may be used for slabs. <br /> Place construction ioints perpendicular to the main reinforcement. Continue , <br /> reinforcement across construction joints, except as otherwise indicated. <br /> Isolation Joints in Slabs-on-Ground: Construct isolation joints in slabs-on-ground at � <br /> points of contact between slabs-on-ground and vertical surfaces, such as column <br /> pedestals, foundation walls, grade beams, and elsewhere as indic�ted. <br /> Joint filler and sealant materials are specified in Division 7 sections of these , <br /> specifications. <br /> Form contraction joints by inserting premolded hardboard or fiberboard strip into fresh � <br /> � 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 groove of loose <br /> debris. � <br /> �ONCRETE WORK 03310 -b <br /> " � <br /> • ' <br />