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laboratory and accepted by the Engineer to produce the results as <br /> specified herein. <br /> c. For each class of concrete there shall be as many design mixes as <br /> there are different combinations or types of ingredients anticipated to <br /> cover the requirements of the work. Each concrete mix shall be <br /> submitted to the Engineer for approval. <br /> d. Admixtures shall not contain more than 0.5% chlorides or <br /> Thiocynates. <br /> e. Use Chloride-free superplasticizers type G(Sulphonated Naphthalen <br /> type) in accordance with ASTM C494 as required to achieve a <br /> workable concrete mix. <br /> f. Weight of normal weight concrete shall not be less than 138 pounds <br /> per cubic foot. <br /> g. Add hardener in concrete for slab on Grade and roof top secondary <br /> concrete topping slab. <br /> h. Concrete used in FDOT R/W shall comply with the FDOT <br /> Standard Specifications for Road and Bridge Construction (current <br /> edition). <br /> 2. Strength: Design concrete mixes based on the required over-design factor according to <br /> ASTM C94, and assuming a coefficient of variation equal to 15. Contractor shall be <br /> responsible for submitting the concrete mix design for Engineer/Architect approval. Design <br /> each class of concrete so that not more than 5 percent of the strength tests will have values <br /> less than specified strength, and the average of any three consecutive strength tests will be <br /> equal to or greater than the specified strength. <br /> Minimum Max. Water/ Minimum Maximum <br /> Compressive Cement Ratio Cement Slump <br /> Strength at (lbs/lbs) Factor (lbs (Inches) <br /> 28 days- (lbs per <br /> Class of cubic yard <br /> Concrete of Concrete) <br /> 4500 0.40 610 4 inches <br /> 'May be increased by 1 inch if proper method of consolidation is used and approved by the <br /> Engineer. <br /> 1.03 QUALITY ASSURANCE: <br /> A. Design Mix: <br /> 08/12 03305-2 11-4179 <br />