Construction shall be in accordance with Indiana Department of Transportation Standard Specifications.
(A) Subgrade preparation. Unless otherwise provided, the upper six inches of all subgrade shall be uniformly compacted to at least 100% standard density as determined by the provisions of AASHTO, T99, Compaction and Density of Soils. During subgrade preparation and after its completion, adequate drainage shall be provided to prevent water from standing on the subgrade. The subgrade shall be so constructed that it will have as nearly as possible uniform density throughout. After compaction and final grading, the subgrade shall be proof rolled with a roller weighing not less than 20 tons. At areas not accessible to the roller, the required compaction shall be obtained with mechanical tamps or vibrators. All soft, yielding or otherwise unsuitable material which will not compact properly shall be removed. Any holes or depressions resulting from the removal of such unsuitable material shall be filled with satisfactory material and compacted to conform with the surrounding subgrade surface. No placement of pavement or base material shall be permitted prior to inspection of subgrade and at no time when the subgrade is frozen or muddy. No hauling shall be done nor equipment moved over the subgrade when its condition is such that undue distortion results. If these conditions are present the subgrade shall be protected with plank runways, mats, or other satisfactory means before hauling is done thereon.
(B) Rigid pavement construction. The subgrade shall be dampened just prior to concrete placement as directed by the inspector. Plain concrete pavement shall be in accordance with Section 501 of the Standard Specifications. Concrete shall be finished by machine or vibratory screed except on widened portions, at intersections or other areas where hand finishing will be permitted. Transverse contraction joints shall be placed at intervals not to exceed 15 feet spacing. Closer spacing to average 12 feet shall be encouraged. Transverse contraction joints may be formed or sawed dummy groove, ribbon or pre-molded strip type, and shall be ¼ the pavement depth. All sawed transverse joints shall be sawed within eight hours after placement of the concrete. Expansion joints with ½ inch pre-formed joint filler shall be placed at a maximum spacing of 500 feet. Expansion joints shall be placed at all intersections and at catch basins and manholes in line of pavement. All expansion joints shall have one inch diameter by 18 inch smooth epoxy coated rebars spaced at one foot centers installed at ½ the pavement depth. Bars shall have five-inch dowel caps installed on alternating ends of the bars, see the Standard Specifications for details. All transverse and expansion joints extend back-of-curb to back-of-curb for the full width of pavement. All joints shall be sealed in accordance with the Standard Specifications. Whenever placement of concrete is interrupted and not resumed within 45 minutes, a load transfer joint shall be required. Whenever the width of pavement is to be greater than 13 feet, longitudinal joints shall be constructed to divide the pavement in driving lanes. This shall be accomplished by a deformed key plate installed prior to placement of the concrete or by installation of sawed longitudinal joints in accordance with the standard specifications. Longitudinal joints shall be tied together with #4 bars three feet long at 24-inch spacing. Joint layout shall be approved prior to the placement of concrete. The method of curing shall be a white pigmented curing compound type 2, complying with AASHTO M 148 and shall be applied in one or two applications as directed by the County Engineer. When applied in two applications, the second shall follow the first within 30 minutes.
(C) Flexible pavement construction. Pavement shall be constructed in accordance with the requirements of Section 401 of the Standard Specifications. Materials shall comply with sections 303, 304 and 403 of the Standard Specifications. See also § 150.47(B)(4) for material descriptions.
(D) Concrete curb and gutter. Typical cross section shall be as shown on the sheets attached to Ordinance 9-1997. When curbs and gutters are built in conjunction with concrete pavements, expansion and contraction joints are to be placed at the same locations as in the pavement slab. Unless poured concurrently, the curb and gutter shall be tied to the pavement by ½-inch deformed bars at three-foot intervals. Additional expansion joints shall be spaced at the ends of all returns and at intervals not to exceed 100 feet. Contraction joints shall be spaced at 20 feet maximum spacing. The curb and gutter shall be cured by keeping the concrete moist for three days, or by the use of a white membrane forming material. All curb installed without properly installed gutter shall be removed and replaced.
(BC Ord. 9-1997, passed 6-2-97)