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INDIAN RIVER COUNTY JULY 25, 2014 <br />INTERGENERATIONAL RECREATION CENTER 100% CONSTRUCTION DOCUMENTS <br />E. Deposit and consolidate concrete for floors and slabs in a continuous operation, within limits of <br />construction joints, until placement of a panel or section is complete. <br />1. Consolidate concrete during placement operations so concrete is thoroughly worked <br />around reinforcement and other embedded items and into corners. <br />2. Maintain reinforcement in position on chairs during concrete placement. <br />3. Screed slab surfaces with a straightedge and strike off to correct elevations. <br />4. Slope surfaces uniformly to drains where required. <br />5. Begin initial floating using bull floats or darbies to form a uniform and open -textured <br />surface plane, before excess bleedwater appears on the surface. Do not further disturb <br />slab surfaces before starting finishing operations. <br />F. Cold -Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete work from <br />physical damage or reduced strength that could be caused by frost, freezing actions, or low <br />temperatures. <br />1. When average high and low temperature is expected to fall below 40 deg F for three <br />successive days, maintain delivered concrete mixture temperature within the temperature <br />range required by ACI 301. <br />2. Do not use frozen materials or materials containing ice or snow. Do not place concrete <br />on frozen subgrade or on subgrade containing frozen materials. <br />3. Do not use calcium chloride, salt, or other materials containing antifreeze agents or <br />chemical accelerators unless otherwise specified and approved in mixture designs. <br />G. Hot -Weather Placement: Comply with ACI 301 and as follows: <br />1. Maintain concrete temperature below 90 deg F at time of placement. Chilled mixing <br />water or chopped ice may be used to control temperature, provided water equivalent of <br />ice is calculated to total amount of mixing water. Using liquid nitrogen to cool concrete is <br />Contractor's option. <br />2. Fog -spray forms, steel reinforcement, and subgrade just before placing concrete. Keep <br />subgrade uniformly moist without standing water, soft spots, or dry areas. <br />3.10 FINISHING FORMED SURFACES <br />A. Rough -Formed Finish: As -cast concrete texture imparted by form -facing material with tie holes <br />and defects repaired and patched. Remove fins and other projections that exceed specified <br />limits on formed -surface irregularities. <br />1. Apply to concrete surfaces not exposed to public view. <br />B. Smooth -Formed Finish: As -cast concrete texture imparted by form -facing material, arranged in <br />an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and <br />defects. Remove fins and other projections that exceed specified limits on formed -surface <br />irregularities. <br />1. Apply to concrete surfaces exposed to public view, to receive a rubbed finish, to be <br />covered with a coating or covering material applied directly to concrete. <br />C. Rubbed Finish: Apply the following to smooth -formed finished as -cast concrete where <br />indicated: <br />1. Smooth -Rubbed Finish: Not later than one day after form removal, moisten concrete <br />surfaces and rub with carborundum brick or another abrasive until producing a uniform <br />CAST -IN-PLACE CONCRETE 033000 - 15 <br />