720— Concrete Curb, Gutter, Curb and Gutter, Sidewalk, Driveway, and Median

720.1 Description

1 Construct Portland cement concrete curb, Portland cement concrete gutter, Portland cement concrete curb and gutter, Portland cement concrete sidewalk, Portland cement concrete driveway, and Portland cement concrete median.

720.2 Materials

720.2.1 Portland Cement Concrete

1 Provide Class 2500 Portland cement concrete conforming to Section 701.

720.2.2 Expansion Joint Material

1 Provide expansion joint materials meeting Section 723.

720.2.3 Reinforcing Steel

1 Provide r einforcing steel conforming to Section 703.

720.3 Construction

720.3.1 Subgrade

1 Thoroughly compact t he subgrade and finish to a smooth, firmly compacted surface, which is moist at the time the concrete is placed. Where it is impractical to use standard type rollers, accomplish compaction by vibratory hand compactors. Remove and replace concrete that settles and/or cracks after placement as directed by the RCE without additional compensation.

720.3.2 Forms

1 Use wood or metal forms of a depth equal to the thickness of the concrete course. Ensure that the forms are free from warp and are of sufficient strength when staked to hold the alignment during the concrete placing and finishing operations. Before concrete is placed agai nst the forms, clean and oil the forms. Use flexible or curved forms on curves as necessary to prevent a chord effect in the alignment of the finished work.

720.3.3 Existing Sidewalks and Driveways

1 Where a portion of an existing sidewalk or driveway is reconstructed, cut the existing section to a minimum depth of 2 in. with a suitable saw at the location