Orange County NC Website
Browse       Search
CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />MISCELLANEOUS CAST-IN-PLACE CONCRETE 033053 - 7 <br />D. Float Finish: Apply float finish to surfaces indicated, to surfaces to receive trowel finish, and to <br />floor and slab surfaces to be covered with fluid-applied or sheet waterproofing, fluid-applied or <br />direct-to-deck-applied membrane waterproofing. <br />E. Trowel Finish: Apply a hard trowel finish to surfaces indicated and to floor and slab surfaces <br />exposed to view or to be covered with resilient flooring, carpet, ceramic or quarry tile set over a <br />cleavage membrane, paint, or another thin film-finish coating system. <br />F. Nonslip Broom Finish: Apply a nonslip broom finish to surfaces indicated and to exterior <br />concrete platforms, steps, and ramps. Immediately after float finishing, slightly roughen <br />trafficked surface by brooming with fiber-bristle broom perpendicular to main traffic route. <br />3.9 CONCRETE PROTECTING AND CURING <br />A. General: Protect freshly placed concrete from premature drying and excessive cold or hot <br />temperatures. Comply with ACI 306.1 for cold-weather protection and with ACI 301 <br />(ACI 301M) for hot-weather protection during curing. <br />B. Evaporation Retarder: Apply evaporation retarder to concrete surfaces if hot, dry, or windy <br />conditions cause moisture loss approaching 0.2 lb/sq. ft. x h (1 kg/sq. m x h) before and during <br />finishing operations. Apply according to manufacturer's written instructions after placing, <br />screeding, and bull floating or darbying concrete, but before float finishing. <br />C. Begin curing after finishing concrete but not before free water has disappeared from concrete <br />surface. <br />D. Curing Methods: Cure formed and unformed concrete for at least seven days by one or a <br />combination of the following methods: <br />1. Moisture Curing: Keep surfaces continuously moist for not less than seven days with the <br />following materials: <br />a. Water. <br />b. Continuous water-fog spray. <br />c. Absorptive cover, water saturated and kept continuously wet. Cover concrete <br />surfaces and edges with 12-inch (300-mm) lap over adjacent absorptive covers. <br />2. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture-retaining <br />cover for curing concrete, placed in widest practicable width, with sides and ends lapped <br />at least 12 inches (300 mm), and sealed by waterproof tape or adhesive. Cure for not less <br />than seven days. Immediately repair any holes or tears during curing period using cover <br />material and waterproof tape. <br />3. Curing Compound: Apply uniformly in continuous operation by power spray or roller <br />according to manufacturer's written instructions. Recoat areas subjected to heavy rainfall <br />within three hours after initial application. Maintain continuity of coating and repair <br />damage during curing period. <br />4. Curing and Sealing Compound: Apply uniformly to floors and slabs indicated in a <br />continuous operation by power spray or roller according to manufacturer's written <br />instructions. Recoat areas subjected to heavy rainfall within three hours after initial <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2