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<br />Copyright 2005 AIA <br /> <br />MASTERSPEC Short Form <br /> <br />02/05 (R 05/06) <br /> <br />Accurately position for attachment of loose hardware, and secure in place during precasting <br />operations. Locate anchorage hardware where it does not affect position of main reinforcement <br />or concrete placement. <br /> <br />1. Weld-headed studs and deformed bar anchors used for anchorage according to <br />AWS D1.1/D1.1M and AWS C5.4, "Recommended Practices for Stud Welding." <br /> <br />B. Furnish loose hardware items including steel plates, clip angles, seat angles, anchors, dowels, <br />cramps, hangers, and other hardware shapes for securing precast structural concrete units to <br />supporting and adjacent construction. <br /> <br />C. Cast-in reglets, slots, holes, and other accessones m precast structural concrete units as <br />indicated on the Contract Drawings. <br /> <br />D. Cast-in openings larger than 10 inches (250 mm) in any dimension. Do not drill or cut openings <br />or prestressing strand without Architect's approval. <br /> <br />E. Reinforcement: Comply with recommendations in PCI MNL 116 for fabricating, placing, and <br />supporting reinforcement. <br /> <br />F. Reinforce precast structural concrete units to resist handling, transportation, and erection <br />stresses. <br /> <br />G. Prestress tendons for precast structural concrete units by either pretensioning or post-tensioning <br />methods. Comply with PCI MNL 116. <br /> <br />H. Comply with requirements in PCI MNL 116 and in this Section for measuring, mixing, <br />transporting, and placing concrete. After concrete batching, no additional water may be added. <br /> <br />1. Place concrete in a continuous operation to prevent seams or planes of weakness from forming <br />in precast concrete units. <br /> <br />J. Thoroughly consolidate placed concrete by internal and external vibration without dislocating <br />or damaging reinforcement and built-in items, and minimize pour lines, honeycombing, or <br />entrapped air on surfaces. Use equipment and procedures complying with PCI MNL 116. <br /> <br />K. Comply with ACI 306.1 procedures for cold-weather concrete placement. <br /> <br />L. Comply with PCI MNL 116 procedures for hot-weather concrete placement. <br /> <br />M. Identify pickup points of precast structural concrete units and orientation in structure with <br />permanent markings, complying with markings indicated on Shop Drawings. Imprint or <br />permanently mark casting date on each precast structural concrete unit on a surface that will not <br />show in fmished structure. <br /> <br />N. Cure concrete, according to requirements in PCI MNL 116, by moisture retention without heat <br />or by accelerated heat curing using low-pressure live steam or radiant heat and moisture. Cure <br />units until compressive strength is high enough to ensure that stripping does not have an effect <br />on performance or appearance of fmal product. <br /> <br />PLANT -PRECAST STRUCTURAL CONCRETE <br /> <br />03410-7 <br />