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D. Admixtures: <br /> 1. Air-Entraining Admixture: ASTM C 260. <br /> <br /> E. Vapor Retarder: Multi-ply reinforced polyethylene sheet, ASTM E 1745, Class C, not less than <br /> 7.8 mils (0.18 mm) thick; or polyethylene sheet, ASTM D 4397, not less than 10 mils (0.25 <br /> mm) thick. <br /> <br /> F. Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber. <br /> <br /> G. Curing Materials: <br /> 1. Evaporation Retarder: Waterborne, monomolecular film forming, manufactured for ap- <br /> plication to fresh concrete. <br /> 2. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth made from jute or kenaf. <br /> 3. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap- <br /> polyethylene sheet. <br /> 4. Water: Potable. <br /> 5. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315, <br /> Type 1, Class A. <br /> <br />2.2 CONCRETE MIXES <br /> A. Comply with ACI 301 requirements for concrete mixtures. <br /> <br /> B. Design mixes prepared by engineer of foundations and floor slabs, proportioned according to <br /> ACI 301, for normal-weight concrete determined by either laboratory trial mix or field test data <br /> bases. <br /> <br /> C. Add air-entraining admixture at manufacturer's prescribed rate to result in concrete at point of <br /> placement having an air content of 2.5 to 4.5 percent. <br /> 1. Air content of trowel-finished interior concrete floors shall not exceed 3.0 percent. <br /> <br />2.3 CONCRETE MIXING <br /> <br /> A. Ready-Mixed Concrete: Comply with ASTM C 94. <br /> 1. When air temperature is between 85 and 90 deg F (30 and 32 deg C), reduce mixing and <br /> delivery time from 1-1/2 hours to 75 minutes; when air temperature is above 90 deg F (32 <br /> deg C), reduce mixing and delivery time to 60 minutes. <br /> <br /> B. Project-Site Mixing: Measure, batch, and mix concrete materials and concrete according to <br /> ASTM C 94. Mix concrete materials in appropriate drum-type batch machine mixer. <br /> 1. For mixer capacity of 1 cu. yd. (0.76 cu. m) or smaller, continue mixing at least 1-1/2 <br /> minutes, but not more than 5 minutes after ingredients are in mixer, before any part of <br /> batch is released. <br /> 2. For mixer capacity larger than 1 cu. yd. (0.76 cu. m), increase mixing time by 15 seconds <br /> for each additional 1 cu. yd. (0.76 cu. m). <br /> <br /> C. Provide batch ticket for each batch discharged and used in the Work, indicating Project identifi- <br /> cation name and number, date, mix type, mix time, quantity, and amount of water added. Rec- <br /> ord approximate location of final deposit in structure. <br /> <br />City of Paris, Texas 03300 - 2 T-Hangar Building <br /> <br /> <br />