All operations in connection with excavation, construction of embankments, including borrow, and grading pertaining thereto for sidewalks, and the preparation of subgrade shall be performed in accordance with these specifications, applicable provisions of the Standard Specifications of the State of Ohio, Department of Transportation, latest edition, and any further requirements of the City Engineer.
The excavating and grading of the area on which the sidewalk is to be laid, construction of embankments, compaction of the subgrade, the rolling and other work necessary for the completion of the subgrade, shall be done under the direction of the City Engineer and in a manner acceptable to him. All unclassified excavation, except rock, to a depth greater than six inches below the existing ground surface shall be considered as a separate pay item.
Each layer of the embankment material, not to exceed six inches in loose depth, shall be disked sufficiently to break down oversized clods and insure uniform density and proper compaction. Each layer shall be thoroughly compacted by a roller suitable for the type of embankment material and approved by the City Engineer.
All concrete sidewalks shall be composed of coarse aggregate, Portland cement and water. The coarse aggregate shall be limestone and shall meet the requirements as specified under Sec. 703.03, 703.02 Standard Specifications of the State of Ohio, Department of Transportation, latest edition, and shall be limestone aggregate unless otherwise directed by the City Engineer. Each size shall be weighed into the batch separately. Unless otherwise directed, the ratio of No. 4 size of coarse aggregate to total coarse aggregate may be varied within the range of 35 to 50 percent by weight, to secure the most desirable and uniform gradation of the combined materials. The Portland cement and sand shall also meet the requirements of such Standard Specifications of the State of Ohio, Department of Transportation, latest edition. The weights of fine and coarse aggregate and the quantity of water per sack of cement shall be determined by the City Engineer from the weights given in the table for Class "C" concrete, using not more than the net amount of water shown and the range in slump stated. The minimum cement content per cubic yard of concrete shall be 6.5 sacks.
Unless otherwise required by the City Engineer, the mixing of the concrete in a transit mixer (truck) shall be an acceptable method of mixing.
Side forms for concrete sidewalks shall be of steel of an approved section, shall be straight and of a depth equal to the thickness of the sidewalk at the edge. An approved four-inch steel side form with an approved lift may be used for the five-inch concrete walks across driveways, etc.
A slope of one-fourth inch per foot is required by the City when constructing sidewalks in the public rights of way.
The subgrade shall be sufficiently moistened just before the concrete is placed. The concrete shall be deposited and compacted in a single layer. It shall be struck off with a template and smoothed with a float to provide a sandy texture. The edges shall be rounded to a one-fourth- inch radius. The sidewalk shall be divided into blocks at six-foot intervals unless otherwise directed by the City Engineer. The dividers shall be straight and of a depth equal to the thickness of the concrete. Sidewalks forms shall remain in place until twenty-four hours after the concrete is placed. Any defective concrete shall be removed immediately following the removal of the forms, and shall be replaced or repaired in a manner that is satisfactory to the City Engineer.
The curing of the concrete shall be accomplished by spraying with a waterproof membrane all in accordance with the provisions of the Standard Specifications of the State of Ohio, Department of Transportation, latest edition and any further requirements of the City Engineer. (Ord. 1989-10. Passed 4-24-89.)