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' 40-27 BUILDING <br />CAST -IN -PLACE CONCRETE <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />PART 3 - EXECUTION <br />' 3.1 FORMWORK INSTALLATION <br />A. Design, erect, shore, brace, and maintain formwork, according to ACI 301, to support <br />vertical, lateral, static, and dynamic loads, and construction loads that might be <br />applied, until structure can support such loads. <br />' B. Construct formwork so concrete members and structures are of size, shape, alignment, <br />elevation, and position indicated, within tolerance limits of ACI 117. <br />' C. Limit concrete surface irregularities, designated by ACI 347 as abrupt or gradual, as <br />follows: <br />' 1. Class A, 1/8 inch for smooth -formed finished surfaces. <br />2. Class B, 1/4 inch for rough -formed finished surfaces. <br />' D. Construct forms tight enough to prevent loss of concrete mortar. <br />E. Construct forms for easy removal without hammering or prying against concrete <br />surfaces. Provide crush or wrecking plates where stripping may damage cast -concrete <br />surfaces. Provide top forms for inclined surfaces steeper than 1.5 horizontal to 1 <br />vertical. <br />1 1. Install keyways, reglets, recesses, and the like, for easy removal. <br />2. Do not use rust -stained steel form -facing material. <br />F. <br />Set edge forms, bulkheads, and intermediate screed strips for slabs to achieve <br />required elevations and slopes in finished concrete surfaces. Provide and secure units <br />to support screed strips; use strike -off templates or compacting -type screeds. <br />G. <br />Provide temporary openings for cleanouts and inspection ports where interior area of <br />formwork is inaccessible. Close openings with panels tightly fitted to forms and <br />securely braced to prevent loss of concrete mortar. Locate temporary openings in <br />' <br />forms at inconspicuous locations. <br />H. <br />Chamfer exterior corners and edges of permanently exposed concrete. <br />I. <br />Form openings, chases, offsets, sinkages, keyways, reglets, blocking, screeds, and <br />bulkheads required in the Work. Determine sizes and locations from trades providing <br />' <br />such items. <br />J. <br />Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, <br />' <br />dirt, and other debris just before placing concrete. <br />K. <br />Retighten forms and bracing before placing concrete, as required, to prevent mortar <br />leaks and maintain proper alignment. <br />L. <br />Coat contact surfaces of forms with form -release agent, according to manufacturer's <br />written instructions, before placing reinforcement. <br />C06922.001.00 03 30 00 - 9 <br />' <br />05-22-14 <br />