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' C. Curing Methods: Cure concrate by curing compound, by moist curing, by moisture- <br /> retaining cover cwring,or by combining these methods, as specified. <br /> � D. Pravide moisture curing by tlie following methods: <br /> 1. Keep concrete surface continuously wet by covering with water. <br /> � 2. Use continuous water-fog spray. <br /> 3. Cover concrete surface with specified absorptive cover,thoroughly saturate cover <br /> with water, and keep continuously wet. Piace absorptive cover to provide <br /> coverage of concrete surfaces and edges, with a 4-inch lap over adjacent <br /> , ahsorptive covers. <br /> E. Provide moisture-retaining cover curing as follows: <br /> ' 1. Covesr concrete surfaces with moisture-retaining cover for curing concrete,placed <br /> in widest practicable width with sides and ends lapped at least 3 inches and sealed <br /> by waterproof tape or adhesive. Immediately repair any holes or tears during <br /> ' cw�ting period using cover material and waterproof tape. <br /> F. Apply curing compound on exposed interior slabs and on exterior slabs, walks,and curbs <br /> ' as follaws: <br /> 1. Apply curing compound to concrete slabs as soon as fmal finishing operations are <br /> � complete(within 2 hours and after surface water sheen has disappeared). Apply <br /> uniformly in conti�auous operation by power spray or roller according to <br /> manufacturer's directions. Recoat areas subjected to heavy rainfall within 3 hours <br /> after initial application. Maintain continuity of coating and repair damage during <br /> ' curing period. <br /> 2. Use membrane curing compounds that witl not affect surfaces to be covered with <br /> fmish materials applied d�rectly#o concrete. <br /> � G. Curing Unformed Surfacss: Cure unformed surfaces, including stabs, floor topping, and <br /> o�her flat surfaces,by applying the appropriate curing method. <br /> � 1. Final cure concrete surfaces to receive finish flooring with a moisture-retaining <br /> cover,unless otherwise directed. <br /> � 3.11 CONCRETE SURFACE REPAIRS <br /> A. Max dry pack mortar,consisting ofone part portland cement to 2-1/2 parts fine aggrega#e <br /> passing a No. 16 mesh sieve,using only enough water as required for <br /> � handling and pIacing. <br /> 1. G�t out honeycombs, rock pockets, voids ovex 1/4 inch in any dimension, and <br /> � hoIes left by tie rods and bolts down to solid concrete but in no case to a depth iess <br /> than 1 inch. Make edges of cuts perpendicular to the concrete surface. <br /> Thoroughly clean, dampen with water, and brush-coat the area to be patched with <br /> bonding agent. Place patching martar before bonding agent has dried. <br /> ' 2. For surfaces exposed to view, blend white portland cement and standard portland <br /> cement so that, when dry, patching mortar will match surrounding color. Provide <br /> test areas at inconspicuous locations to verify mixture and color match before <br /> ' proceeding with patching. Compact mortar in place and strike-off slightly hig,her <br /> than surrounding surface. <br /> A. Sampling and testing for c�uality control during concrete placement may incIude the <br /> � following,as directed by Architect. <br /> 1. Sampling Fresh Concrete: ASTM C 172, excegt modified for slump to comply <br /> , with ASTM C 94. <br /> a Slump: ASTM C 143;one test at point of discharge for each ciay's pour of <br /> each type of concrete;additional tests when concrete consistency seems to <br /> � have changed. <br /> CONCRETE Page 7 of 8 <br />