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CURBS, GUTTERS, SIDEWALKS, AND DRAINAGE STRUCTURES

Concrete curbs, gutters, sidewalks, and drainage structures shall be constructed as shown

on the Plans and as specified in these Specifications.

Forms shall conform to the requirements in Section 24, “Side Forms and Headers”, and this

Section (Section 27), of these Specifications.

Forms for curb and gutter shall be wood with a smooth upper edge, having a width equal to

the full depth of the curb and gutter and a nominal thickness of two inches (2”). Warped forms

and forms not having a straight upper edge shall not be used. Benders, or thin plank forms,

rigidly placed, may be used for returns and other curves. All forms shall be carefully set to

proper alignment and grades and shall be rigidly held in place by the use of not less than five

(5) pairs of stakes to every twenty-foot (20’) section, and other sections in proportion. Clamps,

spreaders, and braces shall be used where required or as directed by the Agency.

Sidewalk forms shall be surfaced wood with a smooth upper edge, having a width equal to

the full depth of the finished sidewalk and a nominal thickness of two inches (2”). Warped forms

and forms not having a straight upper edge shall not be used. Sidewalk forms shall be set with

the upper edge true to line and grade and shall be rigidly held in place by stakes placed on the

outside of the forms and set flush with the top edge of the form. The side forms shall not be

removed for at least twelve (12) hours after the finishing has been completed.

Curbs, gutters, and sidewalks may be placed by using an extrusion machine as provided in

Section 27-7, “Extruded Construction”, in this Section of these Specifications in lieu of using

27-3 CONCRETE IN CURBS, GUTTERS, AND SIDEWALKS

Concrete in curbs, gutters, and sidewalks shall be Class "B-2”, as specified in Section 50-5,

“Portland Cement Concrete”, of these Specifications.

Subgrade shall be prepared as specified in Section 18-2.05, “Subgrade Preparation”, of

these Specifications. A six-inch (6”) thick Class 2 aggregate base section shall be required

under all curbs, gutters, and sidewalks. The requirement to excavate for and place the six-inch

(6”) thick Class II aggregate base section shall apply to both construction of new curbs, gutters,

and sidewalks, and to the replacement of existing curbs, gutters, and sidewalks.

Before placing concrete, the subgrade shall be well dampened. A joint shall be constructed

at the end of concrete placement, each day, or whenever the concrete placement work is

terminated. The joint shall be vertical and square ended, and shall be placed at the point of an

expansion joint, as defined in the following Section (27-3.01).

27-3.01 Expansion Joints, Weakened Plane Joints, and Score Marks

In curbs, gutters, and sidewalks, an expansion joint shall be placed at the end of round

corners and at major structures such as utility vaults, at portions of sidewalk that include a

manhole, on each side of A-6 & A-7 driveways, on each side of sidewalk ramps (expansion

joints may be omitted between two adjoining ramps), and at other locations as shown on the

Plans or as directed by the Agency. In addition, expansion joints shall be placed at sixty-foot

(60’) intervals of all curbs, gutters, and sidewalks. Expansion joint material shall be one-half

inch (1/2") thick, be shaped to fit the geometry of the curbs, gutters, and/or sidewalks, and

extend for the full depth of the curbs, gutters, and/or sidewalks. Expansion joint material shall