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practicable width with sides and ends lapped at least 3 inches and sealed by waterproof tape <br /> or adhesive. Immediatety repair any holes or tears during curing period using cover material <br /> � and waterproof tape. <br /> F. Apply curing compound on exposed interior slabs and on exterior slabs,wallcs,and curbs <br /> as follows: <br /> 1. Apply curing compound to concrete slabs as soon as final fmishing operations are <br /> complete(within 2 hours and after surface water sheen has disappeared). Apply uniformly <br /> in continuous operation by power spray or roller according to manufacturer's directions. <br /> Recoat areas subjected to heavy ra.infall within 3 hours after initial application. Maintain <br /> continuity of coating and repair damage during curing period. <br /> 2. Use membrane curing compounds that will not affect surfaces to be covered with finish <br /> materials applied directly to concrete. <br /> G. Curing Unformed Surfaces: Cure unformed surfaces,including slabs,floor topping,and <br /> other flat surfaces,by applying the appropriate curing method. <br /> 1. Final cure concrete surfaces to receive finish flooring with a moisture-retaining cover,unless <br /> otherwise directed. <br /> 3.11 CONCRETE SURFACE REPAIRS <br /> A. Mix dry-pack morta.r,consisting of one part portland cement to 2-1/2 parts fine aggregate <br /> passing a No.16 mesh sieve,using only enough water as required for handling and placing. <br /> 1. Cut out honeycombs,rock pockets,voids over 1/4 inch in any dimension,and holes left by <br /> tie rods and bolts down to solid concrete but in no case to a depth less than 1 inch. Make <br /> edges of cuts perpendicular to the concrete surface. Thoroughly clean,dampen with water, <br /> and brush-coat the area to be patched with bonding agent. Place patching mortar before <br /> bonding agent has dried. <br /> 2. For surfaces exposed to view,biend white portland cement and standard portland cement so <br /> that,when dry,patching mortar will match surrounding color. Provide <br /> test areas at inconspicuous locations to verify mixture and color match before proceeding <br /> with patching. Compact mortar in place and strike-off slightly higher than surrounding <br /> surface. <br /> B. Sampling and testing for quality control during concrete placement may include the <br /> following,as directed by Architect. <br /> 1. Sampling Fresh Concrete: ASTM C 172,except modified for slump to comply with ASTM <br /> C 94. <br /> a. Slump: ASTM C 143;one test at point of discharge for each day's pour of each type <br /> of concrete;additional tests when concrete consistency seems to have changed. <br /> b. Air Content: ASTM C 173,volumetric method for lightweight or normal weight <br /> concrete;ASTM C 231,pressure method for normal weight concrete;one for each <br /> day's pour of each type of air-entrained concrete. <br /> c. Concrete Temperature: ASTM C 1064;one test hourly when air temperature is 40 <br /> deg F(4 deg C)and below,when 80 deg F(27 deg C)and above,and one test for <br /> each set of compressive-strength specimens. <br /> d. Compression Test Specimen: ASTM C 31; one set of four standard cylinders for <br /> each compressive-strength test,unless otherwise directed. Mold and store cylinders <br /> for laboratory�ured test specimens except when field-cured test specimens are <br /> required. <br /> e. Compressive-Strength Tests: ASTM C 39;one set for each day's pour exceeding 5 <br /> cu.yd.plus additional sets for each 50 cu.yd.more than the first 25 cu.yd.of each <br /> Page 7 of 8 <br />