(A) Construction specifications. This work shall consist of constructing rigid (Portland cement concrete pavement) according to Section 420 of the IDOT Standard Specifications, except as modified as follows:
(1) The finishing machine shall be of a type approved by the City Engineer, and shall be capable of striking off, consolidating and finishing concrete to the consistency required by the specifications to the proper crown and grade.
(2) A mechanical longitudinal float will not be required.
(3) Hand held fogging equipment capable of spraying a uniform application of membrane curing compound and maintaining constant pressure meeting the approval of the Engineer, will be allowed.
(4) Longitudinal float hand method will be permitted if approved by the City Engineer.
(5) Type A final finish shall be used throughout the project unless directed otherwise by the City Engineer.
(B) Subgrade preparation. Prior to placement of concrete on the subgrade/subbase, 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) Dry subgrades shall be made wet in advance of concrete placement.
(2) Under no circumstances shall concrete be placed on a frozen subgrade.
(C) Pavement thicknesses. Concrete pavement shall be construction to the following thicknesses:
Arterial/Industrial | |
Thickness | 10 inch minimum design based on traffic estimates |
Reinforcement | Wire mesh required |
Traverse joints | 40 foot o.c. with 18 inch long no. 6 dowels every 12 inch o.c. |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
Collector (Commercial) | |
Thickness | 9 inch minimum design based on traffic estimates |
Reinforcement | Wire mesh required |
Traverse joints | 40 foot o.c. with 18 inch long no. 6 dowels every 12 inch o.c. |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
Collector (Residential) | |
Thickness | 8 inch minimum design based on traffic estimates |
Reinforcement | None |
Traverse joints | 15 foot un-dowled transverse contraction joints |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
Local (Commercial) | |
Thickness | 8 inch minimum design based on traffic estimates |
Reinforcement | None |
Traverse joints | 15 foot un-dowled transverse contraction joints |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
Local (Residential) | |
Thickness | 8 inch minimum |
Reinforcement | None |
Traverse joints | 15 foot un-dowled transverse contraction joints |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
Alley | |
Thickness | 7 inch minimum design based on traffic estimates |
Reinforcement | None |
Traverse joints | 15 foot un-dowled transverse contraction joints |
Longitudinal joints | 30 inch no. 6 tie bars every 30 inch o.c. |
(D) 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 30 minutes of being deposited on grade.
(3) The finishing floats shall be passed across the entire surface a minimum of two times with an overlap of 50% between successive locations along the pavement.
(E) Straightedge testing.
(1) 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.
(a) High areas shall be cut down and refinished with a five-foot float.
(b) The corrected area shall be checked again with the ten foot straightedge.
(2) The straightedge shall be held in successive positions parallel to the pavement centerline in contact with the surface.
(F) Pavement joints.
(1) All pavement joints shall be according to the standard details.
(2) All bars shall be epoxy coated.
(3) All joints (transverse or longitudinal) shall be sealed with an approved hot-pour joint sealer according to Sections 451 and 452 of the “Standard Specifications for Road and Bridge Construction,” except the crack sealant shall be Crafco Sealant or approved equal according to ASTM D5167.
(a) Prior to traffic being allowed on newly placed concrete pavement, all sawed joints are to be thoroughly cleaned of all foreign material, including membrane curing compound prior to sealing operations.
(b) The joint faces shall be clean and surface dry when the seal is applied.
(4) Contraction joints.
(a) Transverse construction joints.
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 no. 6 deformed bars, 30 inches long, spaced at 24-inch centers.
(b) 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 11,000 lbs. for no. 6 bars.
2. As an option, a trapezoidal metal joint type C (preformed keyway) as specified by IDOT and shown in the standard specification plan sheets may be utilized in lieu of tie bars.
(c) Construction joints must be at least five feet from a contraction joint.
(5) Sawed joints.
(a) Longitudinal sawed joint. The developer shall install longitudinal joints along the centerline of two lane pavements, assuring that the joints are no closer than eight feet or farther than 15 feet apart according to the standard details.
(b) Transverse sawed contraction joints. The developer shall install transverse sawed contraction joins, consisting of planes of weakness created by cutting grooves in the surface of the pavement as specified in the standard drawings. Where specified in Table 153.044, load transfer devices consisting of dowel bars supported on an approved dowel bar assembly shall be provided.
(c) The joints shall be sawed within 24 hours of concrete placement or as soon as the concrete has hardened sufficiently to permit sawing without excessive raveling.
(6) Expansion joints.
(a) To prevent street creep, type A3 four-inch seamless rubber expansion joints shall be installed as depicted on Standard Specifications Plan Sheet T-2A.
(b) Expansion joints at driveways, entrances and the like. All entrances, driveways and accessways where concrete abuts the pavement or curb and gutter shall be provided with a 3/4-inch thick pre-molded expansion joint at the interface of the street pavement (or back of curb) and driveway pavement, entrance pavement or accessway pavement. In addition, a 3/4-inch expansion joint shall be provided at all interfaces between the driveway or entrance pavement and proposed residential or commercial structure.
(G) 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 as required.
(1) In doing so the contractor shall ensure 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 gallon per 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 72 hours.
(H) 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°F or lower, concrete less than 72 hours old shall be protected in the following manner:
(1) If the temperature is predicted to fall or falls to 25°F to 32°F, protection shall consist of two layers of polyethylene sheeting or one layer of polyethylene and one layer of burlap, or two layers of waterproof paper.
(2) If the temperature is predicted to fall or falls below 25°F, protection shall consist of six inches of straw covered with one layer of polyethylene sheeting or waterproof paper placed after initial set of the concrete.
(I) Traffic restriction. Traffic shall be restricted on newly placed concrete streets by barricades and appropriate signs for a period of 14 days, provided that the City Engineer may increase the time period depending upon site location and conditions such as weather.
(J) Protective coat.
(1) 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 City Engineer or Administrator, the subdivider/developer shall apply a protective surface treatment consisting of two coats of boiled linseed oil mixture to the surface of the pavement and all appurtenances.
(2) The 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 14 days old and before the pavement is opened to traffic.
(Ord. 2009-21, § 18.5-3-20, passed 10-5-2009; Am. Ord. 2016-29, passed 11-7-2016)