City of Yonkers, NY Article V Resurfacing Over Existing Pavement

§ 104-12 Prescribed pavement.

For resurfacing over existing pavement, asphaltic-concrete pavement is hereby prescribed, approved and adopted, the same to be in accordance with the requirements set forth in this article.

§ 104-13 Asphaltic concrete on old bituminous pavement.

[Amended 7-3-1990 by L.L. No. 5-1990]

A. Preparation of old surface. Cleaning of the old pavement, adjusting of manhole heads, patching holes and application of the tack coat as required and as hereinafter specified shall be done sufficiently in advance of placing the new wearing course so that this operation can proceed without interruption. Special attention shall be given to providing a well-compacted foundation for the new wearing course around the manhole heads after adjusting.

B. Resurfacing procedure.

(1) On the old surface prepared as above shall be placed an asphaltic-concrete wearing course, two inches, more or less, in thickness after compaction, on the existing pavement where and as directed by the Commissioner of the Department of Public Works. Holes in old bituminous pavement shall be thoroughly cleaned and filled with asphaltic concrete compacted as directed before the new two-inch wearing course is laid. Depressions over old sewer trenches or elsewhere, if ordered, shall be filled up to the grade of the adjacent pavement with a wedge course of asphaltic concrete thoroughly rolled before the new two-inch wearing course is laid. The old pavement shall be thoroughly cleaned and, if ordered by the Commissioner of the Department of Public Works, treated with a tack coat of liquid asphaltic product applied with a pressure distributor at a rate of about 10/100 of a gallon per square yard or as needed to ensure a thorough bond between the old road surface and the new construction. Over the tack coat the contractor shall spread asphaltic-concrete wearing course material, to be leveled, raked and rolled with a ten-ton roller to the satisfaction of the Commissioner of the Department of Public Works and feathered out at the edges of the new work.

(2) At the discretion of the Commissioner of the Department of Public Works, the tack coat may be omitted where there is sufficient life in the old bituminous surface and resurfacing is two inches thick; however, at all edges where the resurfacing course is to be feathered out, the old pavement beneath shall be painted with the tack coat material. Stone, brick and concrete gutters under the resurfacing shall be similarly painted.

(3) If ordered by the Commissioner of the Department of Public Works, any holes found in the existing concrete foundation under permanent pavements shall be filled in by the contractor with 1:3:5 concrete. At the discretion of the Commissioner, asphaltic-concrete binder material may be used for this work instead of concrete.

(4) On curbed streets, the wearing course shall in general be raked out along curbs so as to have a compressed thickness of about one inch. Where the top of the curb is three inches or less above the existing pavement in the gutter, the new wearing course shall be feathered out and shall stop six inches from the curb or as directed by the Commissioner.

C. Materials.

(1) In the wearing course, the graded stone aggregate mix shall consist of a graded stone aggregate passing a one-half-inch screen and all retained on a No. 10 screen, a graded fine aggregate of sand or stone screenings, all of which shall pass a No. 10 screen, a mineral filler and asphalt cement, all of which are to be proportioned and mixed according to approved manufacturer's specifications. It is intended that the paving mixture shall have an approximate composition as follows: 50% coarse aggregate, 36.5% fine aggregate, 6% mineral filler and 7.5% asphalt cement. The above percentages are not rigidly fixed and are subject to the final approval of the City's testing agency. See Subsection G below.

(2) The binder course shall consist of a mixture of graded stone aggregate, all passing a one-inch screen and all retained on a No. 10 screen, a graded fine aggregate of sand or stone screenings, all of which shall pass a No. 10 screen, and asphalt cement, all to be proportioned and mixed according to approved manufacturer's specifications. It is intended that the paving mixture shall have an approximate composition as follows: 75% coarse aggregate, 20% fine aggregate and 5% asphalt cement. The above percentages are not rigidly fixed and are subject to the final approval of the City's testing agency. See Subsection G below.

(3) Broken stone shall be produced from tough, durable rock and shall be free from elongated pieces, soft or disintegrated stone, dirt or other objectionable material.

(4) Sand shall consist of clean, hard, durable grains, free from clay, loam and other foreign materials.

(5) Mineral filler shall consist of limestone dust or other approved material.

(6) Asphalt cement shall be refined asphalt and flux, of suitable consistency for paving purposes.

D. Tack coat. The tack coat shall be a quick-setting emulsified asphalt or other type of liquid asphaltic product which, when applied to the existing pavement, will ensure a thorough bond between the new construction and the old road surface.

E. Spreading and rolling.

(1) Unless otherwise permitted by the Commissioner of the Department of Public Works, the asphaltic concrete shall be placed by means of a mechanical spreader so operated that the mixture as spread is free from lumps, of uniform density and to the desired cross section.

(2) After spreading, the mixture shall be thoroughly and uniformly compressed by a three-wheel, power-driven roller, weighing not less than 10 tons, as soon after being spread as it will bear the roller without undue displacement. Delays in rolling freshly spread mixture will not be tolerated. Rolling shall start longitudinally at the sides and proceed toward the center of the pavement, overlapping on successive trips by at least 1/2 the width of a rear wheel. Alternative trips of the roller shall be of slightly different lengths. The pavement shall then be subjected to diagonal rolling in two directions with a tandem roller weighing not less than 10 tons, the second diagonal rolling crossing the lines of the first.

(3) The speed of the roller shall not exceed three miles per hour and shall at all times be slow enough to avoid displacement of the mixture. Any displacements occurring as a result of reversing the direction of the roller or from any other cause shall at once be corrected by the use of rakes and of fresh mixture where required. Rolling shall proceed continuously until all roller markers are eliminated and until the finished course shall have a density not less than 95% of the laboratory-compacted density. If the surface course is being placed at a rate in excess of 300 square yards per hour, the contractor shall use an extra roller. To prevent adhesion of the mixture to the roller, the wheels shall be kept properly moistened, but an excess of either water or oil will not be permitted.

F. Smoothing irons. Heated smoothing irons shall be used to finish the pavement along curbs, around manhole heads and elsewhere where necessary.

G. Intent of specifications; approval of sources of supply for aggregates and mineral filler.

(1) It is the intent of these specifications to secure a pavement that will conform to the latest construction specifications of the Asphalt Institute. The contractor shall submit samples with manufacturer's specifications for the asphaltic-concrete mixtures he proposes to use in the work, and these are to be examined and passed upon by the testing agency engaged by the City. The contractor shall make such changes in the formulas submitted as may be required by the testing agency in order that the mixture delivered and used in the work will be such as to produce the pavement required.

(2) Approval of sources of supply for aggregates and mineral filler shall be obtained from the Commissioner of the Department of Public Works before being used in the mixture.

§ 104-14 Asphaltic concrete on old concrete pavement.

The work and materials for resurfacing on old concrete pavement shall be the same as on old bituminous pavement, except:

A. All of the old pavement shall be sprayed with tack coat material before asphaltic concrete is applied.

B. The compacted thickness of resurfacing shall be 2 1/2 inches, unless otherwise called for in the job specifications.

§ 104-15 Asphaltic concrete on old brick or stone-block pavement.

The work and materials for resurfacing on old brick or stone-block pavement shall be the same as on old bituminous pavement, except:

A. Resurfacing shall be two-course, 1 1/2 inches of binder course and 1 1/2 inches of wearing course (compacted thickness), unless otherwise called for in the job specifications. If sheet-mix is specified for the wearing course, it shall consist of a graded sand aggregate, all of which shall pass a No. 10 sieve, a mineral filler and asphalt cement, all of which are to be proportioned and mixed according to approved manufacturer's specifications. It is intended that the paving mixture called for under this item shall have an approximate composition as follows: 73% sand, 16% mineral filler and 11% asphalt cement. The above percentages are not rigidly fixed and are subject to the final approval of the City's testing agency. See § 104-13G.

B. Generally where binder course is used, the tack coat application on the old pavement may be omitted.