(A) As a preferred method, Portland Cement Concrete Pavement shall be placed with a slip-form paver with an electronic grade-control system, and capable of striking off, consolidating, and finishing the pavement to the required cross section. Pavement may be placed monolithically with the curb and gutter placed concurrently, or a slip form curbing machine with electronic grade control system may be employed to first pour the curbing, then a slip form paving machine may be utilized to pour the pavement from curb to curb.
(1) Pavement placed with this method shall be checked with a ten (10) foot straightedge and any necessary corrections made as discussed herein.
(B) Subgrade Preparation. Prior to placement of concrete on the subgrade/sub- base, the grade shall be checked for proper depth with a template or a string line (if forms are used), or with before and after elevation shots for slip-form work.
(1) Any soft or spongy areas shall be properly corrected by undercutting or stabilization.
(2) Dry sub-grades shall be made wet in advance of concrete placement.
(3) Under no circumstances shall concrete be placed on a frozen subgrade.
TABLE 34-34 - STRUCTURAL COMPOSITION - RIGID PAVEMENT | |
Arterial/Industrial | |
Pavement: Portland Cement Concrete | 9" depth |
Standard Reinforcement: Wire Mesh | Required |
Joints: Doweled, spaced every | 40 feet |
Sub-base: Crushed stone* | 6" depth |
Underlayment | Required |
Collector (Commercial) | |
Pavement: Portland Cement Concrete | 8" depth |
Standard Reinforcement: Wire Mesh | Required |
Joints: Doweled, spaced every | 40 feet |
Sub-base: Crushed stone * | 4" depth |
Underlayment | Required |
Collector (Residential) | |
Pavement: Portland Cement Concrete | 6" depth |
Reinforcement: | Fiberglass |
Joints: Plain, spaced every 1 | 5 feet |
Local (Commercial) | |
Pavement: Portland Cement Concrete: | 7" depth |
Reinforcement: | Fiberglass |
Joints: Plain, spaced every | 15 feet |
Local (Residential) | |
Pavement: Portland Cement Concrete: | 6" depth |
Reinforcement: | None Req. |
Joints: Plain, spaced every | 15 feet |
Land Access | |
Pavement: Portland Cement Concrete: | 6" depth |
Reinforcement: | None Req. |
Joints: Plain, spaced every | 15 feet |
Alley | |
Pavement: Portland Cement Concrete: | 6" depth |
Reinforcement: | None Req. |
Joints: Plain, spaced every | 15 feet |
(C) Placement and Finishing. Plastic Portland Cement Concrete shall be deposited on the grade in successive batches as a continuous operation and in such a manner so as to require a minimal amount of rehandling or segregation.
(1) No batch/load shall be incorporated that has been in the truck longer than the maximum allowed haul time, as stated herein.
(2) The operation shall be coordinated in such a manner so as to have the mixture struck off and consolidated within thirty (30) minutes being deposited on grade.
(3) The longitudinal float shall be passed across the entire surface a minimum of two (2) times with an overlap of fifty percent (50%) between successive locations along the pavement.
(D) After the operation of the slip-form paver, the finishing machine, or the longitudinal float, but while the concrete is still plastic, the pavement surface shall be tested with a ten- foot straightedge.
(1) The straight edge shall be held in successive positions parallel to the pavement centerline in contact with the surface.
(E) Advancement along the pavement shall be such to provide at least fifty percent (50%) overlap for successive stages.
(1) High areas shall be cut down and refinished with a five (5) foot float.
(2) The corrected area shall be checked again with the ten (10) foot straightedge.
(F) Transverse Sawed Contraction Joints. The Subdivider/Developer shall install transverse sawed contraction joints, consisting of planes of weakness created by cutting grooves in the surface of the pavement and shall include load transfer devices.
(1) Transverse joint spacing shall not exceed fifteen (15) feet and shall be constructed sawed and sealed in accordance with the Standard Specifications, and the Standard Specification Plan Sheets.
(2) Cutting of said joints shall commence as soon as the concrete has hardened sufficiently to permit sawing without excessive raveling, usually between four (4) and twenty-four (24) hours.
(3) All joints shall be sawed to full depth before uncontrolled shrinkage cracking takes place.
(G) Transverse Expansion Joints. The Subdivider/ Developer shall install transverse expansion joints with load transfer devices in accordance with the Standard Specifications the Standard Specification Plan Sheets.
(1) The dowel units are to be smooth plain round bars placed at mid-height of the pavement with an expansion cap on one end.
(2) The bar assemblies shall be placed so that the bars are parallel to the centerline and to the pavement surface and shall be treated to prevent bonding of the concrete.
(H) Transverse Construction Joints. The Subdivider/Developer shall install transverse construction joints at the end of each day's run, or whenever there is an interruption of more than thirty (30) minutes in the laying of concrete pavement, in accordance with the Standard Specifications and the Standard Specification Plan Sheets.
(1) All transverse construction joints shall be formed by means of a suitable header, accurately set, and securely held in place in a plane perpendicular to the surface of the pavement.
(2) All transverse construction joints shall be "tied" with #4 deformed bars, thirty (30) inches long, spaced at thirty (30) inch centers.
(3) Construction joints must be at least five (5) feet from a contraction joint.
(I) Longitudinal Sawed Joint. The Subdivider/Developer shall install longitudinal joints along the centerline of two-lane pavements, assuring that said joints are no closer than eight (8) feet or farther than fifteen (15) feet apart.
(1) Said joints shall be sawed within ten (10) days of concrete placement and prior to any traffic or vehicles traveling on the surface.
(2) Epoxy-coated deformed steel tie bars, the length, size and spacing of which are shown on the Standard Specification Plan Sheets, shall be placed perpendicular to the longitudinal sawed joints using approved mechanical equipment, firmly supported on support pins, or rigidly supported on approved joint assemblies to prevent displacement.
(J) Longitudinal Construction Joint. When adjacent lanes of pavement or pavement and curb and gutter are constructed separately, the Subdivider/Developer shall install epoxy- coated deformed steel tie bars across the longitudinal construction joint, as detailed in the Standard Specification Plan Sheets, in order to tie the lanes together.
(1) The epoxy coated tie bars shall be installed in preformed or drilled holes along the vertical edge of the first pour, using an approved non-shrink grout or chemical adhesive to provide a minimum pull requirement of 7,750 lbs. for No.5 bars, 5,000 lbs. for No.4 bars, 11,000 lbs. for No.6 bars, and 19,750 lbs. for No.8 bars.
(2) As an option, a trapezoidal metal joint type C (preformed keyway) as specified by the Illinois Department of Transportation shown in the Standard Specification Plan Sheets may be utilized in lieu of tie bars.
(K) Joint Sealing. Prior to traffic being allowed on newly placed concrete pavement, all sawed joints (contraction and longitudinal) are to be thoroughly cleaned of all foreign material, including membrane curing compound, and immediately sealed with hot poured rubber asphalt joint filling compound.
(1) All construction joints and pavement edges shall first be finished with an edging tool having a radius of one-fourth (¼) inch.
(2) The joint faces shall be clean and surface dry when the seal is applied.
(L) Finished Texture. Subsequent to initial set prior to hardening of the surface, the pavement shall be given a roomed or burlap drag finish either transversely or parallel to the centerline of the road, so that the surface is indented to a nominal depth of one-sixteenth (1/16) inch.
(M) Curing Procedures. Following the application, of the finished texture, and as soon as possible without marring the surface, the pavement shall be coated with membrane curing compound required.
(1) In doing so the contractor shall insure that adequate and uniform coverage is achieved.
(2) Two separate applications applied at least one minute apart, each at the rate of not less than one (1) gallon per two hundred fifty (250) square feet will be required upon the surface.
(3) Type III compound shall be agitated immediately before and during the application.
(4) Membrane curing is not permitted where a protective coat or waterproofing is to be applied, or at any area where rubbing or a normal finish is required, or at construction joints other than those necessary in pavement or base course.
(5) Curing shall be maintained for a minimum of seventy-two (72) hours.
(N) Cold Weather Protection. When the National Weather Bureau Forecast for the construction area predicts a temperature of 32°F or lower, or if the actual temperature drops below 32° or lower, concrete less than seventy-two (72) hours old shall be protected in the following manner:
(1) If the temperature is predicted to fall or falls to 25-32°F or lower, protection shall consist of two (2) layers of polyethylene sheeting or one (1) layer of polyethylene and one (1) layer burlap, or two (2) layers of waterproof paper.
(2) If the temperature is predicted to fall, or falls below 25°F, protection shall consist of six (6) inches of straw covered with one (1) layer of polyethylene sheeting or waterproof paper placed after initial set of the concrete.
(O) Traffic Restriction. Traffic shall be restricted on newly placed concrete streets by barricades and appropriate signs for a period of ten (10) days, provided that the Village Engineer may increase the time period depending upon site location and conditions such as weather.
(P) Protective Coat. Whenever pavement is constructed after October 15 and it will be opened to traffic prior to the following April 15, or whenever directed to do so by the Village Engineer or Administrator, the Subdivider/ Developer shall apply a protective surface treatment consisting of two (2) coats of boiled linseed oil mixture to the surface of the pavement and all appurtenances.
(1) Said protective coat shall conform to Section 1023 - Protective Coat of the IDOT Standard Specifications and is to be applied when the concrete is at least fourteen (14) days old and before the pavement is opened to traffic.