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special provisions the required minimum 28-day compressive strength for Class <br />I concrete shall be 2500 psi. <br /> <br />2.09 CONCRETE REINFORCEMENT <br /> <br />A. Concrete reinforcement in sizes No. 3 (3/8-inch) and larger shall be deformed <br />steel bars of the shapes and sizes indicated on the drawings. <br /> <br />B. The steel shall be newly rolled stock, substantially free from mill scale, rust, dirt, <br />grease, or other foreign matter. Bars shall be domestic billet steel. <br /> <br />C. Reinforcing bars shall be Grade 60, in conformance with ASTM Specifications <br />for Concrete Reinforcement, Designation A615, except stirrups and ties shall <br />be Grade 40. <br /> <br />D. Deformations on bars for concrete reinforcement shall conform to the ASTM <br />Specifications for concrete reinforcement, Designation A615. <br />E. Tie Wire - The tie wire shall be 16 gauge or heavier, black annealed wire. <br /> <br />F. Metal Accessories - metal accessories shall be galvanized and sufficient in size <br />and number to rigidly support the reinforcing steel under all conditions. <br /> <br />G. Clean loose rust, grease, or any other coating that could interfere with bond. <br />Where there is delay in depositing concrete after reinforcement is in place, bars <br />shall be reinspected and cleaned when necessary. <br /> <br />H. All steel reinforcing shall be placed in the exact positions and with the spacing <br />shown on the plans or as ordered, during the placing of the concrete. The <br />clear distance between parallel bars shall not be less than one and one half <br />times the bar diameter, and shall in no case be less than one inch, nor less <br />than one and one-third times the maximum size of coarse aggregate. Unless <br />shown otherwise on the drawings, bars shall be lapped not less than 24 <br />diameters nor less than 12 inches. <br /> <br />I. Minimum concrete coverings over reinforcement shall be as follows: <br /> <br />1. For footings and slabs deposited against earth -three inches. <br /> <br />2. For formed surfaces to be exposed to weather, dampness, or in contact <br />with ground after removal of forms - two inches. <br /> <br />2.10 RIP RAP HEADWALLS <br /> <br />A. Portland cement shall be from an approved source and the product of an <br />established and reputable manufacturer. <br /> <br /> <br />City of Sunny Isles Beach <br />NE 174th Street Roadway Improvements <br />02630 - 5 Storm Drainage <br />14-1758 / 09-19-2014 <br />