Portland Cement Concrete Railroad Crossing Art. 422.07 SECTION 422. PORTLAND CEMENT CONCRETE RAILROAD CROSSING
422.01 Description. This work shall consist of constructing a cast-in-place
portland cement concrete railroad crossing constructed in two courses on a prepared subgrade. The removal and replacement of ballast, rails, ties, tie plates, and fastenings; the surfacing and lining of track to true line and grade; and the furnishing and placing of the inner guardrails will be executed by others without charge to the Contractor.
422.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Reinforcement Bars ........................................................................... 1006.10
b.Portland Cement Concrete ..................................................................... 1020
c.Bituminous Materials .............................................................................. 1032
d.Protective Coat ....................................................................................... 1023
e.Grout .................................................................................................. 1024.01
422.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Miscellaneous Equipment .................................................................. 1103.17 CONSTRUCTION REQUIREMENTS
422.04 Cooperation. The Contractor shall cooperate with the Railroad in
order to eliminate undue delays to railroad traffic.
422.05 Subgrade Preparation. After the Railroad has removed or blocked up
the existing rails and ties, and has removed and replaced the ballast, the subgrade shall be compacted to a uniform density throughout, true to grade and cross section.
422.06 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 shall be removed according to Article 420.11.
422.07 Placing and Finishing. The subgrade shall be moistened just before
the concrete is placed. While the tracks are blocked up or removed, the concrete for the lower slab shall be placed in successive batches for the entire width of the slab, consolidated with a hand vibrator, and struck off with floats and trowels. The final troweling shall be done with a steel trowel leaving a smooth, even surface. After the crossties have been reset and aligned, and before the Railroad is allowed to relay the track in its final position, one coat of liquid asphalt (RC-70) shall be applied to the top of the base slab. The concrete in the upper portion or top slab shall then be placed in successive batches for the entire width of the slab, consolidated with a hand vibrator, struck off with floats and trowels, edged, and given a broom finish. The edging tool shall have a 1/4 in. (6 mm) radius. Art. 422.08 Portland Cement Concrete Railroad Crossing
422.08 Adjustments. In order to secure an even track surface, it may be
necessary to correct for variations in thickness of the crossties by one of the following methods.
a.Place the base slab approximately 1/2 in. (13 mm) lower than shown on the plans and provide a cement grout between the top of the base slab and the bottom of the ties. The grout mixture shall be one part cement and two parts sand mixed with water.
b.The ties shall be placed as soon as practicable after the placing of the 8 in. (200 mm) base slab and the elevation adjusted as the ties are laid in the plastic concrete.
422.09 Bituminous Filler for Rails and Flangeways. The bituminous
material used to fill in around the rails and form the flangeways shall be a cold-lay sand-bituminous mixture meeting the requirements of the Engineer. The cold-lay bituminous material used as the filler around the rails shall be laid only when the contact surfaces are dry and the air temperature is 40 °F (5 °C) or higher. Care shall be taken to prevent the bituminous mixture from becoming mixed with foreign materials. The contact surfaces of the rail and concrete shall be painted with a thin, uniform coating of liquid asphalt (RC-70) just before the bituminous cold- lay mixture is placed. The mixture shall be tamped thoroughly into place to the elevation shown on the plans or as directed by the Engineer.
422.10 Protective Coat. Protective coat shall be applied to the top slab
according to Article 420.18.
422.11 Backfill. After the concrete has been cured, the spaces along the
edges of the crossing shall be backfilled to the required elevation with approved granular material. The material shall be compacted and the surface neatly trimmed or graded.
422.12 Disposal of Surplus Material. Surplus or waste material resulting
from the crossing construction operations shall be disposed of according to
Article 202 — 03.
422.13 Method of Measurement. This work will be measured for payment in
place and the area computed in square yards (square meters). Reinforcement bars will be measured for payment in pounds (kilograms) according to Article 508.10. Protective coat will be measured for payment according to Article 420.19.
422.14 Basis of Payment. This work will be paid for at the contract unit price
per square yard (square meter) for PORTLAND CEMENT CONCRETE RAILROAD CROSSING. Reinforcement will be paid for according to Article 508.11. Protective coat will be paid for according to Article 420.20. Portland Cement Concrete Driveway Pavement Art. 423.06 SECTION 423. PORTLAND CEMENT CONCRETE DRIVEWAY PAVEMENT
423.01 Description. This work shall consist of constructing portland cement
concrete driveway pavement on a prepared subgrade.
423.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Preformed Expansion Joint Fillers .......................................................... 1051
423.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Miscellaneous Equipment .................................................................. 1103.17 CONSTRUCTION REQUIREMENTS
423.04 Subgrade Preparation. The subgrade shall be tamped or rolled until
thoroughly compacted and at the proper line and grade as shown on the plans.
423.05 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 shall be removed according to Article 420.11.
423.06 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 a screed. Areas which are inaccessible to the screed method may be struck off and finished by hand methods. After strike off, consolidation, and finishing, the concrete shall be further smoothed by a hand-operated longitudinal float or a long-handled float. After the water sheen has disappeared, the surface shall be given a broom finish. The broom shall be drawn across the driveway at right angles to the edges of the driveway, with adjacent strokes slightly overlapping, producing a uniform, slightly roughened surface with parallel broom marks. The surface shall be divided by grooves constructed in the plastic concrete at 10 ft (3 m) maximum intervals both transversely and longitudinally, unless otherwise directed by the Engineer. These grooves shall extend to 1/4 the depth of the driveway, 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. The edges of the slabs shall be edged as described above. A 1/8 in. (3 mm) or 3/16 in. (5 mm)
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 274–276 of 1,217. View official source ↗