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�) <br /> 2.5 CONCRETE MIX, continued <br /> ', B. Use accelerating admixtures in cold weather only when approved by <br /> � Architect/Engineer. Use of admixtures will not relax cold weather placement <br /> requirements. <br /> �� C. Use calcium chloride only when approved by Architect/Engineer. <br /> D. Use set retarding admixtures during hot weather only when approved by <br /> __ . A.Fs�itect/�ngine�. _ _ _ <br /> E. Add air entraining agent to normal weight concrete mix for work exposed to <br /> exterior. <br /> �� PART 3 EXECUTION <br /> 3.1 EXAMINATION <br /> � A. Verify site conditions under provisions of Section Ol 100. <br /> ` C. Verify requirements for concrete cover over reinforcement. <br /> D. Verify that anchors, seats, plates, reinforcement and other items to be cast into <br /> ��� concrete are accurately placed, positioned securely, and will not cause hardship in <br /> plactng concrete. <br /> � 3.2 PREPARATION <br /> � <br /> A. Prepare previously placed concrete by cleaning with steel brush and applying <br /> �� bonding agent in accordance with manufacturer's instructions. <br /> ;� B. In locations where new concrete is dowelled to existing work, drill holes in existing <br /> concrete, insert steel dowels and pack solid with non-shrink grout. <br /> C. Coordinate the placement of joint devices with erection of concrete formwork and <br />��� placement of form accessories. <br /> 3.3 PLACING CONCRETE <br />� A. Place concrete in accordance with ACI 301. <br /> B. Ensure reinforcement, inserts, embedded parts and formed expansion and <br />�� contraction joints are not disturbed during concrete placement. <br /> ; C. Install vapor retarder under interior slabs on grade. Lap joints minimum 6 inches <br /> D. Repair vapor retarder damaged during placement of concrete reinforcing. Repair <br /> with vapor retarder material; lap over damaged areas minimum 6 inches and seal <br /> watertight. <br /> :- E. Separate slabs on grade from vertical surfaces with building or kraR paper. <br /> � F. Install joint devices in accordance with manufacturer's instructions. <br /> G. Saw cut joints within 24 hours after placing. Use 3/16 inch thick blade, cut into 1/4 <br /> depth of slab thickness. <br />�� <br /> � <br /> � Division 3-Section 03300 <br /> Page 3 of 4 <br /> � <br /> ,.::� <br />