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<br />THE CITY OF SUNNY ISLES BEACH <br />PROJECT NO. 21-1011 <br />BUILDING DEPARTMENT RELOCATION TO ANNEX <br /> <br />Project No. 21-1011 November 2024 033000 Cast-in-Place Concrete-11 <br /> <br />shall not be dropped more than 6 feet. For walls or column placements in <br />excess of 6 feet vertical height, tremie shall be used in placing concrete. If <br />reinforcing steel or formwork is such that tremie cannot be used, method of <br />placement shall be approved by Engineer. <br /> <br />3. Consolidate placed concrete with mechanical vibrating equipment <br />according to ACI 301. <br /> <br />4. Do not use vibrators to transport concrete inside forms. Insert and <br /> withdraw vibrators vertically at uniformly spaced locations to rapidly <br />penetrate placed layer and at least 6 inches into preceding layer. Do not <br />insert vibrators into lower layers of concrete that have begun to lose <br />plasticity. At each insertion, limit duration of vibration to time necessary to <br />consolidate concrete and complete embedment of reinforcement and other <br />embedded items without causing mixture constituents to segregate. <br /> <br />G. Deposit and consolidate concrete for floors and slabs in a continuous operation, <br />within limits of construction joints, until placement of a panel or section is <br />complete. <br /> <br />1. Consolidate concrete during placement operations so concrete is <br />thoroughly worked around reinforcement and other embedded items and <br />into corners. <br /> <br />2. Maintain reinforcement in position on chairs during concrete placement. <br /> <br /> <br />3. Screed slab surfaces with a straightedge and strike off to correct <br />elevations. <br />4. Slope surfaces uniformly to drains where required. <br /> <br />5. Begin initial floating using bull floats or darbies to form a uniform and <br />open-textured surface plane, before excess bleed water appears on the <br />surface. Do not further disturb slab surfaces before starting finishing <br />operations. <br />H. Pumping Concrete: Comply with ACI 301 and as follows. <br /> <br />1. Selection of pipe diameter for pumping shall be such that smallest inside <br />diameter is no less than 4 inches or 3 times nominal maximum size <br />coarse aggregate, whichever is greater. <br /> <br />2. Pumping lines shall be lubricated with minimum of 1 cubic yard of grout <br />prior to pumping regular mix through lines. <br /> <br />3. Contractor shall show sufficient evidence prior to use of pump that mix is <br />pumpable. This shall be accomplished by submittal, in accordance with <br />Specification Section 013300, of a certification from supplier that mix has <br />performed satisfactorily on previous jobs of similar nature or by performing <br />full scale field test for pumpability with line height and other variables being <br />identical (or nearly so) to that of actual placing conditions. <br />I Hot-Weather Placement: Comply with ACI 305.1 and as follows: <br />