702.01 687 SECTION 702 – CEMENT CONCRETE CURB, GUTTER, AND COMBINED CURB AND GUTTER
702.01 Description ................................ ................................ ................... 687
702.02 Materials ................................ ................................ ...................... 687
702.03 Equipment ................................ ................................ .................... 688
702.04 Preliminary Work ................................ ................................ ......... 689
702.05 Subgrade Preparation ................................ ................................ ... 689
702.06 Expansion Joints ................................ ................................ .......... 689
702.07 Limitations on Mixing ................................ ................................ . 689
702.08 Mixing, Placing, and Finishing Concrete ................................ ..... 689
702.09 Protection and Curing ................................ ................................ .. 690
702.10 Backfilling ................................ ................................ ................... 691
702.11 Final Cleanup ................................ ................................ ............... 691
702.12 Method of Measurement ................................ .............................. 691
702.13 Basis of Payment ................................ ................................ .......... 691
DESCRIPTION
702.01 Description
This work consists of constructing Curb, Gutter, or Combined Curb and Gutter of Portland cement concrete. MATERIALS
702.02 Materials
Provide m aterials that meet the applicable requirements of 604 and 913, and as specified in : Preformed Joint Filler ................................ ............................ 905.01 Drain Pipe, Standard Strength ................................ ............... 914.04 To construct curb, gutter, and combined curb and gutter, use Class A concrete meeting the requirements of 604, with the following exception: when placing 702.03 688 concrete with a curb extruding machine, the slump shall range from 0 to 3 inches. The Contractor may adjust water and percentages of fine and coarse aggregate within the limits specified (fine aggregate may range from 40 to 65%) to allow satisfactory placement. The Department will make compressive strength test specimens in accordance with AASHTO T 23. EQUIPMENT
702.03 Equipment
A.Forms Except for the templates between 10 -foot sections, use either wood or metal forms that meet 701.03.A . For the templates , use 1/8-inch thick metal, of the same width as that of the curb, gutter, or combination curb and gutter, and that is not less than ¼ inch more in depth than the respective depth of the type curb and gutter being constructed. The templates shall have lugs or other devices to hold them in position d uring concrete placement and shall be of a design that will allow their removal without damaging the concrete. For gutters, use a strike -off template, of the form and shape of the gutter, to shape the top surface of the gutter.
B.Compaction Equipment Compact the subgrade using tamping or rolling equipment that will produce the desired results.
C.Mixing and Finishing Equipment Use mixers that meet 604.04. With the Engineer’s approval, the Contractor may use a curb machine that will place the concrete in a satisfactory manner. Provide finishing equipment, including satisfactory floats, edgers, spades, and tamps. 702.04 689 CONSTRUCTION REQUIREMENTS
702.04 Preliminary Work
Perform Clearing and Grubbing, Removal of Structures and Obstructions, Excavation and Undercutting, and Embankment Construction as specified in 201, 202, 203, and 205, respectively .
702.05 Subgrade Preparation
Perform subgrade preparation for curb, gutter, and combined curb and gutter to the required dep th, and to a width that will allow the installation and bracing of the forms. Shape and compact the subgrade to a firm, even surface, in reasonably close conformity with the grade and section shown on the Plans. Remove all soft and yielding material, rep lace it with acceptable material, and compact as directed by the Engineer.
702.06 Expansion Joints
Form expansion joints at the intervals and locations shown on the Plans, using 1-inch thick preformed joint filler, unless otherwise specified. Place expansion joints in line with corresponding expansion joints in adjoining pavement or other construction. Cut joint filler to the full cross -section of the curb, gutter, or curb and gutter.
702.07 Limitations on Mixing
Comply with 604.12.
702.08 Mixing, Pl acing, and Finishing Concrete
Mix concrete as specified in 604.13. Immediately before placing the concrete, thoroughly wet the subgrade, and apply a coating of light oil to the forms . Thoroughly clean and oil t he forms before each use. Place concrete as specified in 501.12, except that the me chanical spreader will not be required. Place the concrete immediately after mixing. Spade and vibrate the edges, sides, or faces to thoroughly consolidate the concrete and bring the mortar to 702.09 690 the surface. After vibrating, use a wooden float to give the surface a smooth and even finish. Construct concrete curb, gutter, or combined curb and gutter, to be reasonably true to line, grade, and cross -section, and, unless otherwise shown on the Plans, in sections having uniform lengths of 10 feet. The length of these sections may be reduced to no less than 6 feet where necessary for closures. Carefully set the templates before placing the concrete and keep them in place until the concrete has set sufficiently to hold its shape. Remove templates while the forms are still in place. Remove the forms on the face of all curbs as soon as the concrete will hold its shape, and then use a wooden float on the surface to provide a smooth and even finish. No plastering is permitted. Unless otherwise specified, round the top edges of the curb and the edge of the gutter to a radius of ¾ inch. Finish the edges on each side of templates and expansion joint material with an edging tool having a radius of not over ¼ inch, and then remove all lines or marks with a wet brush. Finish the back of curbs not less than 3 inches below the top of backfill against the curb. Leave all exposed surfaces, against which some rigid type of construction is to be made, smooth and uniform to allow free movement of the curb, gutter, or combined curb and gutter. Remove all tool marks with a wetted brush or wooden float and ensure that the finished surface presents a uniform and pleasing appearance . If the Engineer allows use of curb machines, perform finishing as specified above, except that inst ead of constructing the curbs in sections, contraction joints may be sawed a minimum depth of ¼ the thickness of the section, at intervals of 6 to 10 feet. Place weep holes or drainage openings through curbs as shown on the Plans or as directed by the Engi neer. Place coarse aggregate behind each opening as needed.
702.09 Protection and Curing
Immediately after finishing the concrete, provide protection and perform curing as specified in 501.18. Protect the curb, gutter, and combined curb and gutter until final acceptance. Repair concrete that is damaged before final acceptance by removing and reconstructing each 10 -foot section that has been damag ed at no cost to the Department. 702.10 691 702.10 Backfilling Immediately after the concrete has set sufficiently and the forms have been removed, fill the space behind the curb or combined curb and gutter with suitable material, placed in layers not exceeding 4 inches in loose thickness, and compact until firm and stable.
702.11 Final Cleanup
Perform final cleanup as specified in 104.10. COMPENSATION
702.12 Method of Measurement
The Department will measure Concrete Curb, Concrete Gutter, and Concrete Combined Curb and Gutter for payment by the cubic yard, complete in place. The volume, per linear foot of length, will be obtained from the dimensions shown on the Plans. Linear measurements will be surface measurements taken along the center of gravity of the section. Unless otherwise shown on the Plans, the Department will consider subgrade preparation, backfill, expansion joint materials, and drain pipe to be incidental to the work. The Department will not measure or make payment under this Section for curb integral with concrete pavement or concrete base unless otherwise shown on the Plans or specified in the Contract.
702.13 Basis of Payment
The Department will pay for accepted quantities, complete in place, at the contract prices as follows: Item Pay Unit Concrete Curb Cubic Yard Concrete Gutter Cubic Yard Concrete Combined Curb and Gutter Cubic Yard Such payment is full compensation for all subgrade preparation, backfill, and all other incidentals necessary to com plete the work. 703.01 692 SECTION 703 – CEMENT CONCRETE DITCH PAVING
703.01 Description ................................ ................................ ................... 692
703.02 Materials ................................ ................................ ...................... 692
703.03 Equipment ................................ ................................ .................... 693
703.04 Preliminary Work ................................ ................................ ......... 693
703.05 Subgrade Preparation ................................ ................................ ... 693
703.06 Joints ................................ ................................ ............................ 694
703.07 Limitations on Mixing ................................ ................................ .. 694
703.08 Mixing, Placing, and Finishing Concrete ................................ ..... 694
703.09 Protection and Curing ................................ ................................ .. 694
703.10 Backfilling ................................ ................................ .................... 694
703.11 Final Cleanup ................................ ................................ ............... 694
703.12 Method of Measurement ................................ .............................. 695
703.13 Basis of Payment ................................ ................................ .......... 695
DESCRIPTION
703.01 Description
This work consists of constructing paved ditches of Portland cement concrete on a prepared subgrade. MATERIALS
703.02 Materials
Provide materials that meet the applicable requirements of 604. For Portland cement concrete ditch paving, use Class A concrete meeting the requirements of 604.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 696–700 of 1,072.