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9.0 CONCRETE WORKS <br />• 9.1 Scooe <br />The Contractor shall furnish facilities, labor, and materials <br />and perform all operations necessary to furnish, place, and install <br />concrete, reinforcing steel (rebar), form work, embedments, and <br />appurtenances thereto necessary for construction of the concrete <br />structures shown on the Drawings. <br />In the event that concrete construction fails to conform to <br />the requirements of this Specification, the .Contractor may be <br />required to repair or remove and replace said concrete in a manner <br />satisfactory to the Engineer. When the Engineer rules that such <br />repair or removal and replacement is required, he will notify the <br />Contractor in writing, stating the extent of the repair or <br />replacement to be made. <br />• 1 9.2 Concrete Material <br />9.2.1 Mix Design <br />Design of concrete mix shall be the responsibility of <br />the Contractor. The suitability of the design mix shall be <br />verified by the test strengths of specimens made in the field, <br />unless otherwise approved by the Engineer. <br />9.2.2 Classes of Concrete <br />Concrete shall have a minimum 28-day compressive strength <br />of 3,500 psi, when sampled, cured, and tested in accordance <br />with ASTM C-172, Method of Sampling Fresh Concrete, ASTM C-31, <br />Making and Curing Concrete Compression Test Specimens in the <br />Field and ASTM C-39, Method of Test for Compressive Strength <br />of Molded Concrete Cylinders. In addition, the maximum <br />• aggregate size shall be 1-1/2 inches and the slump at time of <br />43 <br />