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<br />Copyright 2002 AIA <br /> <br />MASTERSPEC Short Form <br /> <br />08/02 (R 05/06) <br /> <br />F. Broom Finish: Apply a broom fInish to exterior concrete platfonns, steps, and ramps, and <br />elsewhere as indicated. <br /> <br />3.9 CONCRETE PROTECTING AND CURING <br /> <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 ACI301 for hot- <br />weather protection during curing. <br /> <br />B. Evaporation Retarder: Apply evaporation retarder to unformed concrete surfaces if hot, dry, or <br />windy conditions cause moisture loss approaching 0.2 Ib/sq. ft. x h (1 kg/sq. 111 X h) before and <br />during fInishing operations. Apply according to manufacturer's written instructions after <br />placing, screeding, and bull floating or darbying concrete, but before float fInishing. <br /> <br />C. Cure concrete according to ACI 308.1, by one or a combination of the following methods: <br /> <br />1. Moisture Curing: Keep surfaces continuously moist for not less than seven days. <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 rnm), 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 /> <br />a. After curing period has elapsed, remove curing compound without damaging <br />concrete surfaces by method recommended by curing compound <br />manufacturer[ unless manufacturer certifies curing compound will not <br />interfere with bonding of floor covering used on Project]. <br /> <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 />application. Repeat process 24 hours later and apply a second coat. Maintain continuity <br />of coating and repair damage during curing period. <br /> <br />3.10 CONCRETE SURFACE REPAIRS <br /> <br />A. Defective Concrete: Repair and patch defective areas when approved by Architect. Remove <br />and replace concrete that cannot be repaired and patched to Architect's approval. <br /> <br />3.11 FIELD QUALITY CONTROL <br /> <br />A. Testing and Inspecting: Owner will engage a qualified independent testing and inspecting <br />agency to perform field tests and inspections and prepare test reports. <br /> <br />CAST -IN-PLACE CONCRETE <br /> <br />03300 - 9 <br />