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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <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 AC1301 <br /> (ACI 301M),as follows: <br /> 1. Minimum Compressive Strength: 3000 psi(20.7 MPa)at 28 days. <br /> MISCELLANEOUS CAST-IN-PLACE CONCRETE 033053 - 3 <br />