Article 1 — Description
Construct hydraulic cement concrete sidewalks, Americans with Disabilities Act ramps, and steps.
Article 2 — Materials
Furnish materials in accordance with the following. Item 360, “Concrete Pavement” Item 420, “Concrete Substructures” Item 421, “Hydraulic Cement Concrete” Item 440, “Reinforcement for Concrete” Use Class A concrete unless otherwise shown on the plans. Use Grade 8 coarse aggregate for extruded Class A concrete. Use other grades if approved. Use of fibers meeting the requirements of DMS -4550 , “Fibers for Concrete,” to replace reinforcing steel in Class A concrete is allowed unless otherwise shown on the plans. Dose fibers in accordance with the Department’s MPL of prequalified fibers for concrete. Furnish detectable warning material in accordance with DMS -4350 , “Detectable Warning Material.”
Article 3 — Construction
Shape and compact subgrade, foundation, or pavement surface to the line, grade, and cross -section shown on the plans. Lightly sprinkle subgrade or foundation material immediately before concrete placement. Hand-tamp and sprinkle foundation when placement is directly on subgrade or foundation materials. Remove and dispose of existing concrete in accordance with Item 104, “Removing Concrete.” Provide a clean surface for concrete placement directly on the surface material or pavement. Furnish and place reinforcing steel in accordance with Item 440 unless fiber reinforced concrete is used. Mix and place concrete in conformance with the pertinent Items. Hand- finishing is allowed for any method of construction. Finish exposed surfaces to a uniform transverse broom finish surface. Curb ramps must include a detectable warning surface and conform to details shown on the plans. Install joints as shown on the plans. Ensure that abrupt changes in sidewalk elevation do not exceed 1/4 in., sidewalk cross slope does not exceed 2%, curb ramp grade does not exceed 8.3%, and flares adjacent to the ramp do not exceed 10% slope measured parallel to the curb line. Ensure that the sidewalk depth and reinforcement are not less than the driveway cross- sectional details shown on the plans where a sidewalk crosses and is part of the concrete driveway. Use construction methods in conformance with manufacturers’ recommendations when installing detectable warning surface. Install detectable warning surface as shown on the plans. Provide finished work with a well -compacted mass, a surface free of voids and honeycomb, and the required true-to-line shape and grade. Cure for at least 72 hr. in accordance with Item 420. 812 3.1. Conventionally Formed Concr ete. Provide pre- molded or board expansion joints of the thickness shown on the plans for sidewalk section lengths greater than 8 ft. but less than 40 ft., unless otherwise directed. Terminate workday production at an expansion joint.
3.2 Extruded or Slipformed Concrete . Provide any additional surface finishing immediately after extrusion or
slipforming as shown on the plans. Construct joints at locations as shown on the plans or as directed.
Article 4 — Measurement
Sidewalks will be measured by the square yard of surface area. Curb ramps will be measured by the square yard of surface area or by each. A curb ramp consists of the ramp, landing or turning space, adjacent flares or side curb, and detectable warning surface as shown on the plans. Steps will be measured by the s quare yard of horizontal surface area.
Article 5 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for “Concrete Sidewalks” of the depth specified, “Concrete Sidewalk (Steps),” and “Curb Ramps” of the type specified. This price is full compensation for surface preparation of sidewalk foundation; materials; removal and disposal of existing concrete; excavation, hauling, and disposal of excavated material; drilling and doweling into existing concrete curb, sidewalk, and pavement; repair of adjacent street or pavement structure damaged by these operations; and equipment, labor, materials, tools, and incidentals. Sidewalks that cross and are part of the concrete driveways or turnouts will be measured and paid for in accordance with Item 530, “Intersections, Driveways, and Turnouts.”