609Curb and Gutter

Curb and Gutter Description

609.01This work consists of the construction of curb, gutter or combination curb and gutter

per these specifications and in conformity with the lines and grades shown on the plans or established. The types of curb are designated as follows: Type 2 Cast-in-Place Concrete Curb Type 4 Dowelled Concrete Curb Type 6 Sloping Curb The section will be as shown on the plans. Materials

609.02Except as provided below the materials used shall meet the requirements of the

following subsections: Bed Course Material 703.07 Joint Filler 705.01 Reinforcing Steel 709.01

Concrete for curb shall be Class B and meet the requirements of Section 601. Bituminous curb shall be constructed of the same gradation of aggregate and the same grade of bituminous material as the top layer or top course of bituminous pavement used on the project. Concrete and bituminous mixes will be subject to inspection and tests at the plants for compliance with quality requirements. Construction Requirements

609.03Cast-in-Place Concrete Curb. All required hand finishing shall be performed in

conformance with subsection 601.12(a).

608.03(a)

that there will be no interference to the inspection of grade or alignment. All forms shall extend for the entire depth of the curb and shall be braced and secured sufficiently so that no deflection from alignment or grade will occur during the placing of the concrete.

requirements for the class of concrete specified. Compaction of concrete curb, gutters, or combination curb and gutter, placed in forms shall have thorough consolidation that shall be achieved by tamping and spading, vibrating, or other acceptable methods. Forms shall be left in place until the concrete has set sufficiently so that they can be removed without injury to the curb. Upon removal of the forms, the exposed curb face shall be immediately finished to a uniform surface. For the purpose of matching adjacent concrete finishes or for other reasons, the Engineer shall approve methods of finishing. Plastering will not be permitted.

609.04

otherwise ordered. Sections shall be separated by open joints 1/8 inch wide except at expansion joints.

using a 1/2-inch preformed expansion joint filler. When the curb is constructed adjacent to or on concrete pavement, expansion joints shall be located opposite the expansion joints in the pavement. Expansion joints shall be installed between the concrete curb and any fixed structure or bridge. Expansion joint material shall extend the full depth of contact surface.

kept moist for three days, or the curb shall be cured by the use of membrane-forming curing compound. The method and details of curing shall be subject to the approval of the Engineer.

be backfilled to the required elevation with suitable material, which shall be thoroughly tamped.

use of a curb-forming machine.

concrete curb, gutters, or combination curb and gutter shall be tested with a 10-foot straightedge laid along the exposed surface in a longitudinal direction. The Contractor shall furnish an approved 10-foot straightedge and provide an operator to aid the Engineer in testing the exposed surfaces. All surfaces shall be measured in a longitudinal direction. Deviation of any exposed surface in excess of that specified shall be corrected at the Contractor’s expense. Longitudinal surface tolerances for the top and face are:

inch from the edge of the straightedge.

inch from the edge of the straight edge with allowance made for curve deflection.

609.04(unused)

609.05Bituminous Curb

placing the bituminous mixture, the surface shall receive a tack coat of bituminous material of the type and grade approved by the Engineer. The rate of application of the tack coat material shall be 0.05 to 0.15 gallons per square yard of surface. In the application of this tack coat, the Contractor shall prevent the spread of this tack coat to areas outside of the area to be occupied by the curb.

609.06

paver with curb attachments. The automatic curb machine shall meet the following requirements and shall be approved before its use:

machine riding above the bed where the curb is constructed.

sections or sections with short radii are required, or for such other reasons as warranted. The resulting curb shall conform in all respects to the curb produced by the use of the machine. Upon completion of placement of bituminous curb, a fog coat of emulsified asphalt shall be placed on the exposed surfaces of the curb at the rate of approximately 0.1 gallon per square yard.

curb that is clean and dry and that has reached the ambient temperature.

Method of Measurement

609.06Curb will be measured by linear foot along the front face of the section at the finished

grade elevation. Gutter will be measured along the centerline of the gutter. Curb and gutter will be measured along the face of the curb. Deduction in length will be made for drainage structures, such as catch basins, drop inlets, etc., installed in the curb, gutter, or curb and gutter.

Basis of Payment

609.07The accepted quantities will be paid for at the contract unit price for each of the pay

items listed below that appear in the bid schedule, including dowels and expansion joint material. Payment will be made under: Pay Item Pay Unit Curb, Type__ (Section____) Linear Foot Gutter, Type__ (____Foot) Linear Foot Curb and Gutter, Type__ (Section____) Linear Foot

Bed course material will be measured and paid for per Section 206. Fog coat and tack coat for Curb Type 6 will not be measured and paid for separately but shall be included in the work.

609.07

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610.01