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section 4.2 through 4.8 (excluding section 4.6), or other pre -approved methods so as to produce <br />a workable concrete having the properties of strength, slump and air content set out elsewhere <br />in the Contract Documents. No materials or mixes not currently approved shall be submitted by <br />the Contractor for use in this project. <br />B. Portland Cement <br />The cement used to manufacture concrete shall comply with Florida D.O.T. Standard <br />Specifications for Road and Bridge Construction, 206 Edition, Section 921. The cement used to <br />manufacture concrete shall conform to AASHTO M 85 or M 240. If requested by the Engineer, <br />the cement supplier shall submit a certification that the cement used on the project conforms <br />to the applicable specifications with complete mill analysis for every 200 tons used. <br />Aggregate shall conform to ASTM -C-33, or to Florida D.O.T. Standard Specifications for Road <br />and Bridge Construction, 2006 Edition, Section 901 and 902. <br />D. Admixtures <br />Air entraining admixtures shall conform to ASTM -C-260. Type A water reducing admixtures <br />(normal setting) shall conform to ASTM -C-494. Type D water reducing admixtures (retarders) <br />shall conform to ASTM -C494. Type E water reducing admixtures (accelerating) shall conform <br />to ASTM -C-494. Fly ash shall conform to ASTM -C-618 Type F with the following restriction: <br />Sulfur trioxide shall not exceed 5.0 percent, and loss of ignition shall not exceed 5.0 percent. <br />E. Water <br />Water shall conform to Florida D.O.T. Standard Specifications for Road and Bridge <br />Construction, 206 Edition, Section 923. If the water is of questionable quality, it shall be tested <br />in accordance with AASHTO-T-26, "Standard Method of Test for Quality of Water to be <br />Used in Concrete". <br />F. Pozzolans and Slag <br />Pozzolans and Slag shall conform to the Florida D.O.T. Standard Specifications for <br />Road and Bridge Construction, 2006 Edition, Section 929, <br />G. Concrete Strength <br />Concrete shall meet the minimum compressive strength (f,, in psi) as indicated in the Contract <br />Documents at 28 days. Conformance to strength requirements shall be determined by ACI <br />Standard 318-77, sections 4.8.2.3 and 4.8.3. <br />H. Air Content <br />The amount of air entrainment shall be between 3 and 6 percent. <br />I. Slump <br />The mixture <br />shall contain <br />no more <br />water than is <br />necessary to <br />produce concrete which is <br />workable and <br />plastic. Water <br />added at <br />the batch plant <br />and at the job <br />site together shall not exceed <br />02752 - Concrete Paving <br />02752- 3 <br />