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Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />033000-19 Cast-In-Place <br />Concrete <br />2.For lightweight concrete less than 120 pcf density, air content may be up <br />to 7% regardless of exposure condition. <br />3.For concrete with a specified compressive strength (f’c) greater than 5000 <br />psi (35MPa), required air content may be reduced to 5% ± 1.5%. <br />4.Entrained air content noted above shall occur at point of delivery. <br />5.No entrained air content is required in concrete placed in the foundation <br />with no surface exposed to weather. <br />6.All interior steel trowel finished, normalweight slabs shall have a <br />maximum air content of 3%. <br />D.Water-Cementitious Materials (W/cm) Ratio for Normalweight Concrete <br />1.Unless lower limits are stated in the Contract Documents, all concrete <br />exposed to freezing and thawing in moist condition (Exposure Classes F1 <br />and F2) and/or required to be watertight shall have a maximum W/cm <br />ratio of 0.45 and a minimum f’c=4500 psi . <br />2.All concrete exposed to deicing salts, brackish water seawater or spray <br />from these sources (Exposure Class F3) shall have a maximum W/cm <br />ratio of 0.40 and a minimum f’c=4500 psi. <br />3.Absent the above conditions, all concrete with required strength of 4000 <br />psi (28MPa) or higher shall have a maximum W/cm ratio of 0.50. <br />4.The water-cementitious materials ratio shall not exceed values indicated, <br />including any water added to meet specified slump in accordance with the <br />requirements of ASTM C 94. <br />5.Weight of fly ash or pozzolanic admixtures shall be included with the <br />weight of cementitious materials used to determine the water- <br />cementitious materials ratio. <br />E.Slump <br />1.Concrete design mixes shall be proportioned to meet the following slump <br />limitations. Slump should be measured as described in the Owner’s <br />testing agency responsibilities: <br />a)Concrete with high range or mid range water-reducing admixture: <br />Concrete slump prior to addition of high range water-reducing <br />admixture shall not exceed 3" for normalweight concrete. After <br />addition of water-reducing admixture, the concrete shall have a <br />maximum slump of 9" unless otherwise approved by the SER. <br />b)Concrete without a water-reducing admixture: Slump shall not <br />exceed 4”. <br />F.Chloride Ion Content <br />1.The total water-soluble chloride ion content of the mix including all <br />constituents shall not exceed the limits defined in ACI 318 4.3 unless <br />corrosion inhibiting admixtures are added to the mixture to offset the <br />additional chloride. <br />2.If the specified level of water-soluble chloride ion content cannot be <br />maintained, appropriate level of corrosion inhibiting admixture shall be