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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />MISCELLANEOUS CAST-IN-PLACE CONCRETE 033053 - 3 <br />B. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with <br />other admixtures and that will not contribute water-soluble chloride ions exceeding those <br />permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium <br />chloride. <br />1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A. <br />2. Retarding Admixture: ASTM C 494/C 494M, Type B. <br />3. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D. <br />4. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F. <br />5. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, <br />Type G. <br />6. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II. <br />2.5 RELATED MATERIALS <br />A. Vapor Retarder: Plastic sheet, ASTM E 1745, Class A or B. <br />B. Vapor Retarder: Polyethylene sheet, ASTM D 4397, not less than 10 mils (0.25 mm) thick; or <br />plastic sheet, ASTM E 1745, Class C. <br />C. Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulosic fiber, or ASTM D 1752, cork or <br />self-expanding cork. <br />2.6 CURING MATERIALS <br />A. Evaporation Retarder: Waterborne, monomolecular film forming; manufactured for application <br />to fresh concrete. <br />B. Absorptive Cover: AASHTO M 182, Class 3, burlap cloth or cotton mats. <br />C. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene <br />sheet. <br />D. Water: Potable. <br />E. Clear, Non-Membrane-Forming Curing Compound (membrane dissipating): ASTM C 309, <br />Type 1, 1D Class A&B. <br />F. Clear, Waterborne, Membrane-Forming Curing and Sealing Compound: ASTM C 1315, <br />Type 1, Class B. <br />2.7 CONCRETE MIXTURES <br />A. Comply with ACI 301 (ACI 301M) requirements for concrete mixtures. <br />B. Normal-Weight Concrete: Prepare design mixes, proportioned according to ACI 301 <br />(ACI 301M), as follows: <br />1. Minimum Compressive Strength: 3000 psi (20.7 MPa)at 28 days. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2