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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <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 ACI306.1 for cold-weather protection and with ACI301 <br /> (ACI 301 M) 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. in 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 /> MISCELLANEOUS CAST-IN-PLACE CONCRETE 033053 - 7 <br />