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5. Concrete Sidewalks: <br />A. Materials: Sidewalks shall be constructed of concrete with a minimum cement contents of 5 <br />sacks of cement per cubic yard of concrete, 3% entrained air, and a compressive strength of not <br />less than 3,000 pounds per square inch at 28 days. Reinforcing steel shall be #3 bars on 18" <br />centers both ways located two inches (2") below the top surface of the sidewalk. As soon as the <br />concrete has obtained its initial set, a white pigmented approved curing compound shall be <br />applied. <br />B. Construction Procedure: In general, the gade of the sidewalks shall be established with <br />respect to the curb. Forms shall be set for all sidewalk and shall be true to line and grade. Forms <br />shall be set to provide a minimum cross slope of % inch per foot across the sidewalk toward the <br />street. All forms shall remain in place at least twenty-four (24) hours. <br />The plane of all joints shall make a right angle with the surface of the pavement. No joints shall <br />have an error in alignment of more than one-half (1/2") inch at any point. The edges of the slab <br />at all joints, except where joints are sawed, shall be rounded with an edger having a radius of <br />one-quarter (1/4") inch, except as otherwise shown on the plans. The edging shall also be done <br />symmetrically on each section with plane of the joint. <br />Longitudinal expansion joints, joints used to separate new from old concrete, and joints around <br />all fire hydrants shall be made of conventional one-half (1/2") inch asphalt expansion joint <br />material extending completely through the concrete unless otherwise specified on the plans. <br />Contraction joints shall be made in the sidewalk at regular intervals, such intervals generally <br />being equal to the width of the sidewalk. <br />The contractor shall grade or fill, as necessary, along the sidewalk to match the existing ground. <br />Care will be used to insure that adjacent property outside the right-of-way line is protected. <br />6. Curing: All concrete shall be cured by protecting it against loss of moisture for a period <br />of not less than seventy-two (72) hours. Immediately after the surface water sheen has <br />disappeared, impervious membrane curing compound shall be applied uniformly to the surface <br />of the pavement. The membrane curing compound shall be sprayed in one application at a rate <br />of not less than one gallon to one hundred eighty (180) square feet of pavement area. The <br />concrete surface to which membrane curing compound is applied shall be protected from <br />abrasion or damage which results in perforation of the membrane film during the first seventy- <br />two (72) hours after application. After removal of forms, the sides shall be coated with <br />membrane curing compound prior to the banking of earth against them. The curing method as <br />herein specified does not preclude the use of any of the other commonly used methods of curing, <br />and the Engineer may approve them if so requested by the contractor. Payment for curing is <br />considered subsidiary to other bid items in this contract. <br />