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CAST -IN-PLACE CONCRETE Section 03300 15-1207 at time of placement. Concrete shall be delivered, placed and finished in a sufficiently short period of time to avoid surface drying. Concrete shall be kept wet continuously after placement until implementation of curing procedure in accordance with this specification. K. Placing in cold weather: Comply with ACI 306R-02 and CBC 1904A.12. Protect from frost or freezing. No antifreeze admixtures are permitted. When deposited concrete during freezing or near -freezing weather, mix shall have temperature of at least 50 degrees F but not more than 90 degrees F. Concrete shall be maintained at temperature of at least 50 degrees F for not less than 72 hours after placing or until it has thoroughly hardened. L. Horizontal construction joint: Keep exposed concrete face of construction joints continuously moist from time of initial set until placing of concrete; thoroughly clean contact surface by chipping entire surface not earlier than 5 days after initial pour to expose clean hard aggregate solidly embedded, or by approved method that will assure equal bond, such as green cutting. If contact surface becomes contaminated with soil, sawdust or other foreign matter, clean entire surface and re -chip entire surface to assure proper adhesion. M. Conduit, plumbing lines or any other embedment shall not be located in wall panels except where specifically detailed on approved structured drawings. Contractor shall provide detailed shop drawings for tilt -up wall panels showing panel dimensions and locations of all openings, reinforcement and embedded items. 3.04 CONCRETE FINISHES A. Concrete Slab Finishing: Finish slab as required by ACI 302.1 R. Use manual screeds, vibrating screeds or roller compacting screeds to place concrete level and smooth. Do not use "jitterbugs" or other special tools designed for the purpose of forcing the course aggregate away from the surface leaving too thick a layer of mortar. While concrete is still wet but sufficiently hardened to bear a person's weight on knee boards, wood float surface to a true and even plane. Use sufficient pressure to bring moisture to surface and push course aggregate to just below surface. After surface moisture has disappeared, float to true surface and finish utilizing steel trowel. Surface shall be free from trowel marks, depressions, ridges or other blemishes, and shall be acceptable to finish flooring applicators. Tolerance for flatness shall be 1/8" in 10'. Provide final concrete slab finish for various floor types as follows: 1. Interior slabs, smooth finish: Typical finish to be used at all interior slabs to receive applied floor finishes including VCT, sheet vinyl, safety flooring, wood flooring and rubber stair treads/risers. Use also at colored concrete floors and slabs to be left exposed and sealed with Heavy Duty Concrete Sealer. 2. Interior slabs, medium broom finish: Typical finish to be used at all interior slab locations to receive ceramic or quarry tile or other finish materials requiring a roughened surface. Coordinate with general contractor. Use also at locations where slab will be left exposed and will not be colored or sealed, including ramps. At ramp locations, brooming direction shall run perpendicular to slope to form non -slip surface. 3. Exterior slabs, medium broom finish: Typical finish to be used at all exterior walks, stairs and ramps. Brooming direction shall run perpendicular to slope to form non -slip surface. B. Curb Finishing: Steel trowel as described for slab finishing above. C. Joints and Edges: Mark -off walkway edges and exposed joints, where indicated, with %"