603 SIDEWALKS

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603.01 DESCRIPTION.
Construct asphalt or concrete sidewalks and sidewalk ramps. Ensure that the sidewalks and sidewalk ramps are constructed in accordance with the most recent accessibility guidelines of the Americans with Disabilities Act (ADAAmericans with Disabilities Act).
603.02 MATERIALS.
Curing Materials       902.07
Form Release Compound       902.08
Portland Cement Concrete       902.10, Mix No. 3
Asphalt Mix       904
Welded Wire Fabric       908.05
Joint Sealer       911.01
Preformed Joint Fillers       911.02
603.03 CONSTRUCTION.
603.03.01 Concrete Sidewalks.
(a) Excavation. Refer to 602.03.01(a).
(b) Forms.
(1) Fixed Form Method. Use full depth steel or wood forms. Use forms that are straight, free from warp, and of sufficient strength to resist the pressure of the concrete. Brace and stake the forms so that they remain in both horizontal and vertical alignment. Thoroughly clean and coat forms with form release compound each time they are used. Allow the concrete to set for at least 12 hours before removing the forms.
(2) Slip-Form Method. Refer to 604.03.01(b), except use 603.03.01(e) for joint construction.
(c) Concreting. Before placing concrete, moisten the subgrade with as much water as it can absorb. Mix the concrete according to 915.03.04. Volumetric batching and continuous mixing will be permitted. Deposit the concrete on the prepared subgrade in successive batches to the full width of the sidewalk. Thoroughly spade along the edges and tamp the entire surface area to eliminate voids. Strike off and screed the concrete to the top of the forms.
(d) Finishing. Float the surface and apply a broom finish. Do not plaster the surface. Use a 1/4 in. edging tool on all outside edges and all joints.
(e) Joints. Place joints as specified. Tool or saw dummy joints a minimum of 3/4 in. deep.
Match adjacent joints in curb or pavement. Place expansion joint material to the full depth of the concrete.
(f) Cold Weather Protection and Curing. Refer to 520.03.02 and .12. Do not allow pedestrian and vehicular traffic during the curing period.
(g) Expansion Joint Sealing. Prior to sealing, clear dirt and other foreign material from the expansion joints. Ensure that joint walls and all surfaces to which the sealing material is to adhere are surface dry for at least three hours prior to sealing. Do not seal the joints until they are acceptable to the EngineerAny person designated by the Administrator or the procurement officer, acting directly or through his duly authorized representative, such representative acting within the scope of the particular duties assigned to him or of the authority given him.. Ensure that the surface of the sealing compound is not more than 1/8 in. below the sidewalk surface.
603.03.02 Asphalt Sidewalks.
(a) Excavation. Complete excavation, subgrade preparation, and form placement when required, as specified in 603.03.01(a) and (b).
(b) Placement. Place asphalt mix as specified in 504.03.05. When the sidewalk is not placed in forms, use acceptable backfill material to form an 18 in. wide shoulder for the sidewalk or as specified.
(c) Compaction. Use an approved roller. In areas inaccessible to a roller, a vibrating plate compactor or hand tamping may be used. In any case, the asphalt mix shall be uniformly compacted. Start compactive effort as soon as the asphalt mix can be compacted without displacement and continue until the material is thoroughly compacted and all marks have been removed.
603.03.03 Backfill. After the forms have been stripped and repairs are satisfactorily completed, backfill the spaces in front and back of the sidewalk to the required elevations using approved material.
603.04 MEASUREMENT AND PAYMENT.
The payment will be full compensation for all excavation, backfill, disposal of excess or unsuitable material, forms, reinforcement when specified, joints, sealer, compaction, curing, finishing, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
The removal and disposal of unsuitable material will be measured and paid for at the Contract unit price for Class 2 Excavation, which price includes the cost of using suitable excavation as replacement material. When Borrow or Selected Backfill is authorized as replacement material, payment will be made at the Contract unit price bid for the respective items.
When the existing sidewalk is removed and replaced with a new sidewalk, the cost to remove the existing sidewalk will be incidental to the Contract unit price for sidewalk.
603.04.01 Concrete Sidewalks will be measured and paid for at the Contract unit price per square foot of finished surface including sidewalk ramps.
603.04.02 Asphalt Sidewalks will be measured and paid for at the Contract unit price per ton for the mixture placed.