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Specification No . : RGS0024-87 <br /> Part II - SPECIFIC CONDITIONS <br /> Section 11 - Concrete Work <br /> 11 . 9 . 1 Preplacement Inspection : Before placing concrete , <br /> inspect and complete formwork installation , reinforcing <br /> steel , and items to be embedded or cast- in . Notify <br /> other crafts to permit installation of their work ; <br /> cooperate with other trades in setting such work . <br /> Moisten wood forms immediately before placing concrete . <br /> Notify Engineer at least 72 hours before placing any <br /> concrete . <br /> 11 . 9 . 2 Coordinate the installation of joint materials and <br /> moisture barriers with placement of forms and <br /> reinforcing steel . <br /> 11 . 9 . 3 General : Comply with ACIM 304 , and as herein specified . <br /> Deposit concrete continuously or in layers of such <br /> thickness that no concrete will be placed on concrete <br /> which has hardened sufficiently to cause the formation <br /> of seams or planes of weakness . If a section cannot be <br /> placed continuously , provide construction joints as <br /> herein specified . Deposit concrete as nearly as <br /> practicable to its final location to avoid segregation. <br /> 11 . 9 . 4 Placing Concrete in Forms : Deposit concrete in forms in <br /> horizontal layers not deeper than 24 " and in manner to <br /> avoid inclined construction joints . Where placement <br /> consists of several layers , place each layer while <br /> preceding layer is steel plastic to avoid cold joints . <br /> Consolidate placed concrete by mechanical vibrating <br /> equipment supplemented by hand- spading , rodding , or <br /> tamping . Use equipment and procedures for consolidation <br /> of concrete in accordance with ACI recommended <br /> practices . <br /> 11 . 9 . 5 Placing Concrete Slabs : Deposit and consolidate <br /> concrete slabs in a continuous operation , within limits <br /> of construction joints , until the placing of a panel or <br /> section is completed . Move concrete into place with <br /> square tipped shovels , do not use rakes . <br /> 11 . 9 . 6 Consolidate concrete during placing operations so that <br /> concrete is thoroughly worked around reinforcement and <br /> other embedded items and into corners . Vibrators , when <br /> used , shall be inserted and withdrawn vertically . <br /> XI-5 <br />