Art. 423.06 Portland Cement Concrete Sidewalk wide sawcut joint that is 1/4 the depth of the driveway may be substituted for a groove. Tie bars will not be required in construction joints; however the joints shall be edged as described above.
423.07 Expansion Joints. At points where the proposed driveway pavement
occupies the entire space between the concrete curb or combination concrete curb and gutter and an adjacent building, permanent structure, existing driveway or other similar obstruction, 1 in (25 mm) preformed expansion joint filler shall be placed between the driveway pavement and the obstruction. The expansion joint filler shall extend the entire depth of the driveway.
423.08 Backfill. After the concrete has been cured, the spaces along the
edges of the driveway pavement shall be backfilled to the required elevation with approved material. The material shall then be compacted, and the surface neatly graded.
423.09 Disposal of Surplus Material. Surplus or waste material resulting
from the driveway construction operations shall be disposed of according to
Article 202 — 03.
423.10 Method of Measurement. This work will be measured for payment in
place and the area computed in square yards (square meters). Earth excavation will be measured for payment according to Article 202.07.
423.11 Basis of Payment. This work will be paid for at the contract unit price
per square yard (square meter) for PORTLAND CEMENT CONCRETE DRIVEWAY PAVEMENT, of the thickness specified. Earth excavation required will be paid for according to Article 202.08. SECTION 424. PORTLAND CEMENT CONCRETE SIDEWALK
424.01 Description. This work shall consist of constructing portland cement
concrete sidewalk and sidewalk accessibility ramps on a prepared subgrade. This work does not include sidewalk that is integrally a part of a structure.
424.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Preformed Expansion Joint Fillers .......................................................... 1051
424.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Miscellaneous Equipment .................................................................. 1103.17 Portland Cement Concrete Sidewalk Art. 424.07 CONSTRUCTION REQUIREMENTS
424.04 Subgrade Preparation. The subgrade shall be tamped or rolled until
thoroughly compacted and at the proper line and grade as shown on the plans. At locations where sidewalk is constructed at entrances, the sidewalk shall be thickened to the thickness of the adjacent entrance or driveway pavement.
424.05 Forms. Side forms shall be a minimum of 2 in. (50 mm) thick (nominal
dimension) lumber or steel of equal rigidity. They shall be held securely in place by stakes or braces, with the top edges true to line and grade. Forms for the sidewalk accessibility ramps shall be set so that the slab will have a uniform fall between the sidewalk proper and the curb grade. Forms shall be removed according to
Article 420 — 11.
At the Contractor's option, slipforming using equipment approved by the Engineer will be allowed.
424.06 Placing, Strike Off, Consolidation, Finishing, Floating, and Final
Finish. The subgrade shall be moistened just before the concrete is placed. The concrete shall be placed in successive batches for the entire width of the slab, struck- off, consolidated with a hand vibrator, and finished to a true and even surface with floats and trowels. A screed may be used to strike off and finish the concrete. The final finish shall be done with a wooden float, leaving an even surface. Steel trowels shall not be permitted. After the water sheen has disappeared, the surface shall be given a final finish by brushing with a whitewash brush. The brush shall be drawn across the sidewalk at right angles to the edges of the walk, with adjacent strokes slightly overlapping, producing a uniform, slightly roughened surface with parallel brush marks. The surface shall be divided by grooves constructed at right angles to the centerline of the sidewalk. These grooves shall extend to 1/4 the depth of the sidewalk, shall be not less than 1/8 in. (3 mm) nor more than 1/4 in. (6 mm) in width, and shall be edged with an edging tool having a 1/4 in. (6 mm) radius. No slab shall be longer than 6 ft (1.8 m) nor less than 4 ft (1.2 m) on any one side, unless otherwise ordered by the Engineer. The edges of the slabs shall be edged as described above.
424.07 Expansion Joints. Expansion joints shall be 1/2 in. (13 mm) thick and
consist of preformed joint filler. The top of the joint filler shall be 1/4 in. (6 mm) below the surface of the sidewalk. Expansion joints shall be placed in locations as follows.
a.Expansion joints shall be placed between the sidewalk and all structures such as light poles, traffic signal poles, traffic poles, and subway columns, which extend through the sidewalk.
b.Transverse expansion joints shall be placed at maximum intervals of 50 ft (15 m) in the sidewalk. Where the sidewalk is constructed adjacent to pavement or curb having expansion joints, the expansion joints in the Art. 424.07 Portland Cement Concrete Sidewalk sidewalk shall be placed in line with the adjacent expansion joints as nearly as practicable.
c.Expansion joints shall also be placed where the sidewalk abuts existing sidewalks, between driveway pavement and sidewalk, and between sidewalk accessibility ramps and curbs where the ramp abuts a curb.
424.08 Curb Ramps. Curb ramps shall be constructed according to
accessibility standards, the Illinois Accessibility code, and as shown on the plans. Curb ramps shall be constructed to the same thickness as the adjacent sidewalk with a minimum thickness of 4 in. (100 mm).
424.09 Detectable Warnings. Detectable warnings shall consist of a surface
of truncated domes meeting accessibility standards. Detectable warnings shall be installed at curb ramps, medians and pedestrian refuge islands, at-grade railroad crossings, transit platform edges, and other locations where pedestrians are required to cross a hazardous vehicular way. Detectable warnings shall also be installed at alleys and commercial entrances when permanent traffic control devices are present. The installation shall be an integral part of the walking surface and only the actual domes shall project above the walking surface. The product or method used for installing detectable warnings shall come with the following documents which shall be given to the Engineer prior to use.
a.Manufacturer’s certification stating the product is fully compliant with accessibility standards.
b.Manufacturer’s five year warranty.
c.Manufacturer’s specifications stating the required materials, equipment, and installation procedures. Products that are colored shall be colored throughout their entire thickness. The materials, equipment, and installation procedures used shall be according to the manufacturer’s specifications.
424.10 Backfill. After the concrete has been cured, the spaces along the
edges of the sidewalk and ramps shall be backfilled with approved material. The material shall be compacted until firm and the surface neatly graded.
424.11 Disposal of Surplus Material. Surplus or waste material shall be
disposed of according to Article 202.03.
424.12 Method of Measurement. This work will be measured for payment in
place and the area computed in square feet (square meters). Curb ramps, including side curbs and side flares, will be measured for payment as sidewalk. No deduction will be made for detectable warnings located within the ramp. Removal of Existing Pavement and Appurtenances Art. 440.02 Detectable warnings will be measured for payment in place and the area computed in square feet (square meters). Earth excavation will be measured for payment according to Article 202.07.
424.13 Basis of Payment. This work will be paid for at the contract unit price
per square foot (square meter) for PORTLAND CEMENT CONCRETE SIDEWALK, of the thickness specified. Detectable warnings will be paid for at the contract unit price per square foot (square meter) for DETECTABLE WARNINGS. Earth excavation will be paid for according to Article 202.08. PAVEMENT REHABILITATION SECTION 440. REMOVAL OF EXISTING PAVEMENT AND APPURTENANCES
440.01 Description. This work shall consist of the complete removal of
existing pavement, paved shoulders, driveway pavement, median, curb, gutter, combination curb and gutter, paved ditch, and sidewalk; the partial depth removal of concrete medians; and the removal of hot-mix asphalt (HMA) surfaces in preparation for subsequent resurfacing. Pavement removal shall be defined as portland cement concrete or HMA pavement and shall include portland cement concrete or HMA bases, overlays, and stabilized subbase. Paved shoulder removal shall be defined as portland cement concrete or HMA shoulders. Gutter removal and combination curb and gutter removal shall include the complete removal of all inlets, outlets, and entrances contained within the limits of removal. The removal of outlets shall include the entire discharge trough and end curtain wall for trough type outlets and the concrete box and outlet pipe for drop box type outlets. Paved ditch removal shall include the complete removal of all anchor walls and cut-off walls that are contained within the limits of removal.
440.02 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Self-Propelled Milling Machine ........................................................... 1101.16 CONSTRUCTION REQUIREMENTS
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 277–280 of 1,217. View official source ↗