650 Page 463650 CONCRETE CURB AND GUTTER
650.1DESCRIPTION
This work consists of constructing concrete curb and gutter.
650.2MATERIALS
Materials will conform to the following sections. A.Concrete: Class M6, Section 462. B.Preformed Expansion Joint Filler: Section 860. C.Curing Compound: Section 821. D.Reinforcing Steel: Section 1010 .
650.3CONSTRUCTION REQUIREMENTS
The foundation will be excavated, shaped, and compacted to a firm, uniform bearing surface. Unsuitable foundation material will be removed and replaced as directed. The foundation will be thoroughly moistened immediately prior to placing concrete. Moisture will be applied without forming pools of water. Granular material will be furnished, placed, and compacted to the required depth. The forms will be full depth, rigid, unyielding, and mortar tight. The forms will be securely staked, braced, and tied to the required line and grade. In lieu of construction using fixed side forms, concrete may be placed and formed to the required shape by using an approved extrusion machine. When machine placement is used, the Engineer may permit modification of consistency requirements. The exposed surfaces of the curb and gutter will be finished smooth and even. Edges of gutter and the top face edges of the curb will be finished with an approved finishing tool. The top surface of the curb and gutter will be brushed or broomed to slightly roughen the surface and remove the finishing tool marks. All honeycombed surfaces will be corrected to the satisfaction of the Engineer by using a grout composed of one part cement and two parts sand. Severely honeycombed areas will be removed and replaced at the Contractor's expense. Joints will be constructed at the locations and of the dimensions shown on the plans or as directed. When PCC pavement is adjacent to the curb and gutter, the joints will match the contraction joints of the pavement. 650 Page 464When curb and gutter is placed prior to surfacing, the Contractor will be responsible to provide drainage of the roadway. The exposed surfaces of the curb and gutter will be protected and cured in accordance with Section
460.3M, except the minimum curing time will be 72 hours.
After the curing period, the area adjacent to the curb and gutter will be filled to the required elevation with suitable material and the material will be satisfactorily compacted.
650.4METHOD OF MEASUREMENT
Concrete curb, gutter and combined curb and gutter will be measured to the nearest foot. Measurement for concrete curb will be on the inside bottom face of the curb. Measurement for separate gutters and combined curb and gutter will be on the inside edge next to the pavement. Deductions will not be made for lengths of drop inlets, grates, etc., or for the tapering of curb for entrances. Separate measurements will be made for the various types specified and constructed.
650.5BASIS OF PAYMENT
Concrete curb, gutter, and combined curb and gutter will be paid for at the contract unit prices per foot for the types constructed. Payment will be full compensation for furnishing materials, the expansion joints, steel reinforcement, forms bracing, excavation, backfill, labor, equipment, and incidentals necessary. 651 Page 465651 CONCRETE SIDEWALK
651.1DESCRIPTION
This work consists of constructing sidewalks on a prepared subgrade.
651.2MATERIALS
Materials will conform to the following sections: A.Concrete: Class M6, Section 462. B.Preformed Expansion Joint Filler: Section 860. C.Cushion Material: Cushion material will consist of rock, gravel, or sand; crushed or screened to eliminate material retained on a 1 inch sieve. The material will be free from roots, sod, and lumps of dirt. Not more than 25.0% by weight will pass a #200 sieve. D.Curing Compound: Section 821.
651.3CONSTRUCTION REQUIREMENTS
The foundation will be excavated, shaped, and compacted to a firm, uniform bearing surface. Unsuitable foundation material will be removed and replaced as directed. The foundation will be thoroughly moistened immediately prior to placing concrete. Moisture will be applied without forming pools of water. Cushion material will be placed to the depth specified and satisfactorily compacted. Forms will be made of wood not less than 2 inches nominal thickness or of steel of equal rigidity. Flexible strips may be used on curves. The forms will be securely held to line and grade and will not deviate more than 1/8 inch from an accurate template 10 feet in length. The forms will remain in place until the concrete has hardened to the point that no damage will be done to the concrete during form removal. Damage to the concrete as the result of form removal will be repaired by the Contractor at no additional expense to the Department. Joint and edging tools will have an approved 1/4 inch radius. Immediately after the water sheen has disappeared the concrete will be brushed or broomed to slightly roughen the surface and remove tool marks. Contraction and longitudinal joints will be placed at intervals that will provide approximately square sections. The joints will be formed by a grooving tool or sawing to a depth of at least one third the thickness of the sidewalk. When the sidewalk is greater than 8 feet in width, a longitudinal joint may be required, depending on the thickness of the sidewalk. When a longitudinal joint is required, the Contractor will provide the longitudinal joint at the center and the contraction joints will be adjusted to result in approximately square sections. The maximum length and width of a square section is determined by the following formula: 24 x Thickness of Sidewalk (inches) = Maximum Length & Width of Square Sections (inches)