Art. 421.01 Continuously Reinforced Portland Cement Concrete Pavement SECTION 421. CONTINUOUSLY REINFORCED PORTLAND CEMENT CONCRETE PAVEMENT
421.01 Description. This work shall consist of constructing a continuously
reinforced portland cement concrete pavement on a prepared subgrade or subbase.
421.02 Materials. Materials shall be according to Article 420.02. Wide flange
beams shall be according to Article 1006.04 and be galvanized according to AASHTO M 111.
421.03 Equipment. Equipment shall be according to Article 420.03.
CONSTRUCTION REQUIREMENTS
421.04 General. Continuously reinforced concrete pavement shall be
according to Articles 420.04 through 420.18 and the following.
b.Joints and Concrete Lug End Anchorages. The longitudinal and transverse joints and lug end anchorages shall be constructed as specified in the contract according to Article 420.05 with the following exceptions.
1.Longitudinal Sawed Joints. The tie bars in longitudinal sawed joints shall be positioned on the prepared subbase prior to concrete placement and shall either be supported on approved assemblies or securely tied to the underside of the longitudinal bars of the pavement reinforcement.
2.Transverse Construction Joints. Transverse construction joints shall be made at the end of each day or when an interruption in the concreting operation of 30 minutes or more occurs, provided the length of pavement laid from the last joint is 12 ft (4 m) or more and the distance from the construction joint to the nearest bar-lap is at least 3 1/2 ft (1.1 m). The transverse construction joint shall be formed by means of a suitable split header board conforming to the cross section of the pavement, accurately set and securely held in place in a plane perpendicular to the surface of the pavement. The pavement reinforcement bars shall extend continuously through the split in the header board and shall be supported beyond the joint by steel chair supports. The header board shall be kept clean without oil. Excess mortar material accumulated at the front of the paver shall be wasted and not incorporated into the pavement at the joint. Before paving operations are resumed, the header board shall be removed, any concrete or mortar that may have leaked through the holes or split in the header shall be chipped from the face of the joint and removed, all surplus concrete on the subgrade or Continuously Reinforced Portland Cement Concrete Pavement Art. 421.05 subbase shall be cleared away, and any irregularities in the subgrade or subbase shall be corrected. The fresh concrete shall be deposited directly against the old and shall be consolidated with a hand vibrator inserted into the concrete and worked along the entire length of the joint. Transverse construction joints shall not be edged or sealed. The pavement areas adjacent to both sides of a transverse construction joint shall receive additional consolidation from hand vibrators inserted into the concrete and the surface shall be refinished. These areas shall extend at least 10 ft (3 m) from the joint.
3.Transverse Terminal Joint. When specified, transverse terminal joints shall be constructed at the ends of a construction section according to the details shown on the plans. The concrete shall be either Class SI concrete or Class PV concrete. The pad shall be constructed to the same slope and cross section as the pavement and the entire top surface shall be given a smooth finish with a steel trowel. The concrete pad shall be completed and cured as specified in Article 1020.13 before the pavement and remainder of the transverse terminal joint is constructed.
4.Wide Flange Beam Terminal Joint. The sleeper slab shall be constructed of either Class SI concrete or Class PV concrete. The sleeper slab shall be constructed to the same slope and cross section as the pavement. The top surface of the sleeper slab shall be given a smooth finish with a steel trowel on the pavement side of the steel beam and a rough finish on the terminal joint side. The sleeper slab shall be cured according to Article 1020.13(a)(1)(2)(3)(5). The optional adjustable chairs for the beams may be uncoated steel. When used, the chairs shall be at 6 ft (1.8 m) centers, beginning 3 ft (900 mm) from the end of the beam. The concrete in the groove on the expansion side of the wide flange shall be carefully finished across the top and at the edges of the pavement to facilitate unrestrained pavement expansion.
5.Lug End Anchorages. The lugs shall be constructed in a trench without forms. Excavation for the trench shall be to the minimum dimensions shown on the plans. The lugs and the concrete pad above the lugs shall be constructed of either Class SI concrete or Class PV concrete and shall be cured according to Article 1020.13(a)(1)(2)(3)(5). The surface of the concrete pad shall be finished rough and shall be free of any dust, dirt, or other foreign material at the time the continuously reinforced concrete pavement is placed.
421.05 Method of Measurement. This work will be measured for payment as
follows.
a.Contract Quantities. The requirements for the use of contract quantities shall conform to Article 202.07(a). Art. 421.05 Continuously Reinforced Portland Cement Concrete Pavement
b.Measured Quantities. Continuously reinforced portland cement concrete pavement will be measured for payment in place and the area computed in square yards (square meters). The width will be the width of pavement as shown on the plans. Reinforcement bars will be measured for payment in square yards (square meters). The quantity of reinforcement bars will be the computed square yards (square meters) of surface area of the pavement in which the pavement reinforcement is installed. The pavement surfaces upon which the protective coat is applied, except where corrective grinding has been performed, will be measured for payment in place and the areas computed in square yards (square meters).
421.06 Basis of Payment. This work will be paid for at the contract unit price
per square yard (square meter) for CONTINUOUSLY REINFORCED PORTLAND CEMENT CONCRETE PAVEMENT and CONTINUOUSLY REINFORCED HIGH- EARLY-STRENGTH PORTLAND CEMENT CONCRETE PAVEMENT, of the thickness specified. Reinforcement bars will be paid for at the contract unit price per square yard (square meter) for PAVEMENT REINFORCEMENT. Wide flange beam terminal joints will be paid for at the contract unit price per each for WIDE FLANGE BEAM TERMINAL JOINT COMPLETE, of the pavement width specified. Lug anchor systems will be paid for at the contract unit price per each for LUG SYSTEM COMPLETE, of the pavement width specified. Transverse terminal joints will be paid for at the contract unit price per each for TRANSVERSE TERMINAL JOINT COMPLETE, of the pavement width specified. Protective coat will be paid for at the contract unit price per square yard (square meter) for PROTECTIVE COAT. Removing and replacing curing and protective cover, if required, will be paid for according to Article 109.04. When the contract requires the Contractor to furnish a profilograph, the work will be paid for according to Article 407.12. 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.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 271–274 of 1,217. View official source ↗