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Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />033000-33 Cast-In-Place <br />Concrete <br />1.Clean and prepare forms as specified in Section 031000/Concrete <br />Formwork. <br />2.Place concrete continuously without interruption between predetermined <br />construction and contraction joints in walls. <br />3.Deposit concrete in forms in horizontal layers no deeper than 24” <br />(600mm) and in a manner to avoid inclined construction joints. <br />4.Where placement consists of several layers, place each layer while <br />preceding layer is still plastic to avoid cold joints. <br />5.Consolidate placed concrete by mechanical vibrating equipment <br />supplemented by hand-spading, rodding or tamping. <br />a)Use equipment and procedures for consolidation of concrete in <br />accordance with ACI 309R. <br />6.Do not use vibrators to move fresh concrete laterally inside forms from <br />discharge point; shift discharge point as needed. <br />7.Insert and withdraw vibrators vertically at uniformly spaced locations no <br />farther than the visible effectiveness of the machine. <br />8.Place vibrators to rapidly penetrate placed layer and at least 6" (150mm) <br />into preceding layer. <br />9.Do not insert vibrators into lower layers of concrete that have begun to <br />set. <br />10.At each insertion, limit duration of vibration to time necessary to <br />consolidate concrete and complete embedment of reinforcement and <br />other embedded items without causing segregation of mix. <br />11.Do not vibrate Self-Consolidating Concrete (SCC). <br />E.Placing Concrete Slabs: <br />1.Place concrete continuously without interruption between predetermined <br />construction and contraction joints in floors. <br />a)Place slabs on grade by the long strip cast method. Refer to ACI <br />302.1R for recommended methods of placement. <br />2.Deposit and consolidate concrete slabs in a continuous operation, within <br />limits of construction joints, until completing placement of a panel or <br />section. <br />3.Consolidate concrete during placing operations so that concrete is <br />thoroughly worked around reinforcement, other embedded items and into <br />corners. <br />4.Bring slab surfaces to correct level with a straightedge and strike off. <br />a)Use highway straight edges, bullfloats or darbies to smooth <br />surface free of humps or hollows. <br />b)Do not disturb slab surfaces prior to beginning finishing <br />operations. <br />5.Maintain reinforcing in proper position on chairs during concrete <br />placement. <br />6.Do not place materials on slabs or impose loads during period of setting.