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B. Maximum Variation of Surface Flatness: <br /> 1. Exposed Concrete Floors: FF 50/FL 40 <br /> 2. Under Seamless Resilient Flooring: FF 35/FL 25 <br /> 3. Under Carpeting: FF 35/FL 25 <br /> C. Correct the slab surface if tolerances are less than specified. <br /> D. Correct defects by grinding or by removal and replacement of the defective work. Areas requiring corrective <br /> work will be identified. Re-measure corrected areas by the same process. <br /> 4.8 CONCRETE FINISHING <br /> A. Repair surface defects,including tie holes,immediately after removing formwork. <br /> B. Unexposed Form Finish: Rub down or chip off fins or other raised areas 1/4 inch or more in height. <br /> C. Exposed Form Finish: Rub down or chip off and smooth fins or other raised areas 1/4 inch or more in height. <br /> Provide finish as follows: <br /> 1. Smooth Rubbed Finish: Wet concrete and rub with carborundum brick or other abrasive,not more than 24 <br /> hours after form removal. <br /> D. Concrete Slabs: Finish to requirements of ACI 302.111,and as follows: <br /> 1. Surfaces to Receive Thick Floor Coverings: "Wood float"as described in ACI 302.111;thick floor coverings <br /> include quarry tile,ceramic tile,and terrazzo with full bed setting system. <br /> 2. Surfaces to Receive Thin Floor Coverings: "Steel trowel"as described in ACI 301.1R;thin floor coverings <br /> include carpeting,resilient flooring,seamless flooring,thin set quarry tile,and thin set ceramic tile. <br /> 3. Surfaces to Receive Polished Concrete: Use a float pan at least 2 passes in each direction. Finish with <br /> combination blades or Teflon coated trowel blades only as tight as possible minimizing burnish marks <br /> and other appearance defects. Trowel edges with a walk behind trowel at least two times in a counter <br /> clockwise direction going onto the forms. <br /> 4. Other Surfaces to Be Left Exposed: "Steel trowel"as described in ACI 302.1R,minimizing burnish marks <br /> and other appearance defects. <br /> 4.9 CURING AND PROTECTION <br /> A. Comply with requirements of ACI 308R. Immediately after placement,protect concrete from premature drying, <br /> excessively hot or cold temperatures,and mechanical injury. <br /> B. Maintain concrete with minimal moisture loss at relatively constant temperature for period necessary for <br /> hydration of cement and hardening of concrete. <br /> 1. Normal concrete: Not less than 7 days. <br /> 2. High early strength concrete: Not less than 4 days. <br /> C. Surfaces Not in Contact with Forms: <br /> 1. Initial Curing: Start as soon as free water has disappeared and before surface is dry. Keep continuously <br /> moist for not less than three days by water ponding,water-saturated sand,water-fog spray,or saturated <br /> burlap. <br /> 2. Final Curing: Begin after initial curing but before surface is dry. <br /> 4.10 FIELD QUALITY CONTROL <br /> A. An independent testing agency will perform field quality control tests,as specified in Section 014000. <br /> B. Provide free access to concrete operations at project site and cooperate with appointed firm. <br /> 2-26-18 <br /> 033000-9 <br />