608SIDEWALKS

608-1.01 DESCRIPTION . Construct, or retrofit asphalt or concrete sidewalks and curb ramps.

608-2.01 MATERI ALS. Use materials that conform to the following:

608-3.01 CONCRETE SI DEWALKS. Excavate to the required depth and to a width necessary to

install and brace the forms. Shape and compact the foundation to a firm, even surface conforming to the section shown on the Plans. Replace soft and yielding material with approved material. Compact bed course material according to Subsection 203- 3.04. Use full depth forms made of wood or m etal. Use forms that are straight, free from warp, and strong enough to resist the pressure of the concrete without springing. Coat forms with an approved form -release agent. Brace and stake the forms so that they maintain their position until their remova l. Thoroughly moisten the foundation immediately before placing the concrete. Finish the surface according to Section 550- 3.05. Do not plaster the surface. Edge all outside slab edges and all joints to a 1/4 inch radius. Make expansion joints to the dimensions and spacing shown on the Plans and fill with the type of preformed expansion joint filler specified. Divide the sidewalk into specified sections using dummy joints formed by a jointing tool or other acceptable means. Make dummy joints 1/3 the depth of the concrete and approximately 1/8 inch wide. 302 ALASKA 2020 Form construction joints around all appurtenances such as manholes, utility poles, buildings, or bridges, extending into and through the sidewalk. Install preformed expansion joint filler 1/2 inch thick in c onstruction joints. Extend the expansion joint material the full depth of the walk. Apply joint sealer evenly to completely seal all joints. Cure the concrete according to Section 550- 3.06. During the curing period, exclude all pedestrian and vehicular tr affic. Exclude vehicular traffic for additional time as directed.

608-3.02 ASPHALT SID EWALKS. Place bed course material in layers. Compact it according to

Subsection 203- 3.04. Place asphalt material on the compacted bed course in one or more courses as indicated on the Plans. Compact it uniformly to the required depth. Use a power roller of an acceptable type and weight. In areas inaccessible to the roller, use other approved methods.

608-3.03 CURB RAMPS. Construct curb ramps according to the details and t he locations shown

on the Plans. Follow the construction requirements of Subsection 608- 3.01. Give the exposed concrete surface a coarse broom finish. Install detectable warnings.

608-3.04 DETECTABLE WARNINGS . Construct detectable warnings according to the details

and the locations shown on the Plans. Install detectable warning plates by embedding plate flanges into cast in place concrete construction so there are no vertical changes in grade exceeding 0.25 inch or horizontal gaps exceeding 0.5 inch. Align pattern on a square grid in the predominant direction of travel. Install the same type of detectable warning plate throughout the project. Detectable warnings shall be installed according to the 2006 U. S. DOT ADA Standards for Transportation Facilities.

608-4.01 METHOD OF M EASUREMENT. See Section 109 and as follows:

Concrete Sidewalk . By area of finished surface, including ramps. Asphalt Sidewalk . By weight of asphalt mixture placed or by area of finished surface, including ramps. Bed Course Material . By weight or by volume measured in final position. Curb Ramp. By each installation, complete in place, including detectable warnings, ramp runs, backing curbs, flares, and landings necessary to provide a single street -level access. Curb Ramp, Retrofit. By each installation, complete in place.

608-5.01 BASIS OF PA YMENT. Excavation, backfill, reinforcement, expansion joint material, and

other related miscellaneous items are subsidiary. Payment will be made under: PAY ITEM Item Number Item Description Unit 608.0001. ____ Concrete Sidewalk, 4 inches thick SY 608.0001. ____ Concrete Sidewalk, 6 inches thick SY 608.0002.____ Asphalt Sidewalk TON 608.0003.____ Asphalt Sidewalk SY 608.0004.____ Bed Course Material, Grading ___ TON 608.0005.____ Bed Course M aterial, Grading ___ CY 303 ALASKA 2020 PAY ITEM Item Number Item Description Unit 608.0006.____ Curb Ramp EACH 608.0007.____ Curb Ramp, Retrofit EACH 608.0008. ____ Concrete Sidewalk, 4 Inches thick LS 608.0008. ____ Concrete Sidewalk, 6 Inches thick LS 304 ALASKA 2020 SECTION 609 CURBING

609-1.01 DESCRIPTION. Construct curb, gutter, or combination curb and gutter. The types of

curbing are designated as follows: Type 1: Cast -in-place concrete curb Type 2: Precast concrete curb Type 3: Asphalt curb

609-2.01 MATERIALS. Use materials that conform to the following:

Concrete Section 550, Class B Bed Course Material Subsection 703- 2.03 Joint Filler Subsection 705- 2.01 Joint Sealer Subsection 705- 2.02 Joint Mortar Subsection 705- 2.04 Precast Concrete Curb Subsection 712- 2.04 Asphalt material for curbing must conform to the follo wing requirements: Asphalt Binder Subsection 702- 2.01 (Use PG 52- 28 if no Grade is specified.) Aggregate, Type II or III Subsection 703- 2.04 Mix design Requirements (ATM 417): Marshall Stability, lb., min. 1000 Percent Voids, Total Mix 2-5 Compaction, Blo ws/side 50 CONSTRUCTION REQUIREMENTS

609-3.01 GENERAL. Excavate to the required depth. Compact the base upon which curbs,

gutters, and ramps are to be set to a firm, even surface according to Subsection 203- 3.04. Make expansion joints in concrete units that comply with the dimensions and spacing shown on the Plans. Fill expansion joints with the type of preformed expansion joint filler specified. Make repairs to concrete units by removing and replacing the entire unit between scoring lines or joints. Clean all discolored concrete. The Engineer will test the finished surface with a 10- foot straightedge. Variations of more than 1/4 inch from the edge of the straightedge to the top or face of the curb or the surface of gutters and ramps, except at grade changes or curves, are unacceptable.

609-3.02 CAST -IN-PLACE CONCRETE CURBING. Use full -depth forms made of wood or metal

that are straight, free from warp, and constructed so that they will not interfere with the inspection of grade or alignment. Brace and secure forms to prevent deflection from alignment or grade during concrete placement. Coat forms with an approved form -release agent. Thoroughly moisten the foundation immediately before placing the concrete. Compact concrete in the forms by vibration or other acceptable methods. Leave forms in place until the concrete sets sufficiently so that the forms can be removed without damaging the concrete. Finish the surface according to Section 550- 3.05.Immediately upon removing the forms, rub the exposed face to a uni form surface. Do not plast er the surface.