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B. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces <br /> adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent <br /> formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent <br /> unformed surfaces, unless otherwise indicated. <br /> <br />3.4. FINISHING UNFORMED SURFACES <br /> <br /> A. General: Comply with ACI 302.1R for screeding, restraightening, and finishing operations for <br /> concrete surfaces. Do not wet concrete surfaces. <br /> <br /> B. Screed surfaces with a straightedge and strike off. Begin initial floating using bull floats or dar- <br /> hies to form a uniform and open-textured surface plane before excess moisture or bleedwater <br /> apears on the surface. <br /> 1. Do not further disturb surfaces before starting finishing operations. <br /> <br /> C. Trowel Finish: Apply a hard trowel finish to floor and slab surfaces exposed to view. <br />3.5 CONCRETE PROTECTION AND CURING <br /> <br /> A. General: Protect freshly placed concrete from premature drying and excessive cold or hot tem- <br /> peratures. Comply with ACI 306.1 for cold-weather protection, and follow recommendations in <br /> ACI 305R for hot-weather protection during curing. <br /> <br /> B. Evaporation Retarder: Apply evaporation retarder to concrete surfaces if hot, dry, or windy <br /> conditions occur before and during finishing operations. Apply according to manufacturer's <br /> written instructions after placing, screeding, and bull floating or darbying concrete, but before <br /> float finishing. <br /> <br /> C. Begin curing after finishing concrete, but not before free water has disappeared from concrete <br /> surface. <br /> <br /> D. Cure formed and unformed concrete for at least seven days as follows: <br /> 1. 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 />3.6 FIELD QUALITY CONTROL <br /> <br /> A. Testing Agency: Contractor will engage a qualified independent testing and inspecting agency <br /> to sample materials, perform tests, and submit test reports during concrete placement. Tests <br /> will be performed according to ACI 301. <br /> 1. Testing Frequency: At least one composite sample for each 100 cu. yd. (76 cu. m) or <br /> fraction thereof of each concrete mix placed each day. <br /> <br /> END OF SECTION 03300 <br /> <br />City of Paris, Texas 03300 - 4 T-Hangar Building <br /> <br /> <br />