for Highway Construction Page 495 of 71 5 SECTION 614 – SIDEWALKS, DRIVEWAYS, AND CURB RAMPS
614.01 Description.
Construct sidewalks, driveways, and curb ramps.
614.02 Materials.
Provide materials as specified in: Nonstructural Concrete ................................................................................................................. 509 Detectable Warning Surfaces .................................................................................................. 720.10 Use detectable warning surfaces consisting of truncated domes aligned in a square or radial pattern as specified. Ensure the color of detectable warning surfaces contrast visually with adjacent curb and gutter , street, or sidewalk, either light -on-dark or dark -on-light.
614.03 Construction Requirements.
Grade and compact the subgrade to 90 percent of the maximum dry density as determined by AASHTO T 99. Compact aggregate base with at least 2 passes of a lightweight mechanical tamper, roller, or vibratory system. Provide portland cement concrete as specified in 509 with the following exceptions:
1.Float -finish the concrete so the surface is slightly rough, but uniform. Work the slab edges and joints with a ¼ inch radius edging tool. Correct honey -combed or rough s pots using mortar consisting of 1 part c ement and 2 parts approved sand immediately after removing the forms .
2.Place, shape, and compact earth or other approved material against the edge of the sidewalk or driveway.
3.Construct joints as specified.
4.Cure as specified in 502.03.J.
5.Protect the concrete from damage during freezing weather as specified in 502.03.G. Ensure the detectable warning surface is securely embedded in the concrete and installed in accordance with the manufacturer’s written instructions.
614.04 Method of Measurem ent.
The Engineer will measure acceptably completed work as follows:
1.Sidewalks will be by the square yard.
2.Driveways will be by the square yard.
3.Curb ramps will be by the square yard.
614.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: for Highway Construction Page 496 of 715 Pay Item Pay Unit Sidewal k ................................................................................................ SY Drive way ................................................................................................ SY Curb Ramp ............................................................................................ SY Aggregate base will be paid as specified in 303 when an item is included. Detectable warning surfaces are incidental and the cos t included in the contract unit price. When the contract does not include contract pay items for curb ramp related work, this work is incidental . for Highway Construction Page 497 of 715 SECTION 615 – CURB AND GUTTER
615.01 Description.
Construct curb, gutter, combination curb and gutter, or traffic separators.
615.02 Materials.
Provide materials as specified in: Nonstructural Concrete ................................................................................................................. 509 Superpave Hot Mix Asphalt .......................................................................................................... 405 Aggregates ................................................................................................................................... 703 Reinforcing Steel . .................................................................................................................... 708.02 Use Class 30 concrete or use ½ inch nominal maximum aggregate size (NMAS) SP 2 or SP 3 nonstructural mixture as specified in 405.
615.03 Construction Requirements.
Curb , gutter, curb and gutter, and traffic separators may be cast -in-place portland cement concrete. Curb and traffic separators may b e precast portland cement concrete. Curb may be asphalt concrete. Construct contraction joints in portland cement concrete at 10 -foot intervals to a minimum depth of 2 inches. Provide a light broom finish. Cure concrete immediately after finishing as specified in 502.03.J. When precast, cast curb in pieces at least 5 feet, but no more than 10 feet in length. Provide a smooth, glassy finish. Install precast curb on a smooth, compacted surface. Tack the roadway surface where asphalt concrete curb will be constructed. Place approved backfill material in layers behind curbs and compact.
615.04 Method of Measurement.
The Engineer will measure acceptably completed work as follows:
1.Curb and curb and gutter will be by the foot along the face of the curb.
2.Gutter and traffic separator will be by the foot along the centerline of the units. Deductions in length will not be made for embankment protectors , catch basin s, inlet s, driveways, or curb ramps installed in the curb, gutter, or curb and gutter.
615.05 Basis of Payment .
The Department will pay for acceptable quantities at the contract unit prices as follows: Pay Item Pay Unit Curb, Type ___ ...................................................................................... FT Gutter , Type ___ .................................................................................... FT Curb and Gutter , Type ___ .................................................................... FT
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 531–532 of 768.