City of Yonkers, NY Main Thoroughfares

The paving blocks shall be cut from first-quality, light-colored, fine-grained New Hampshire granite, or other granite equal thereto, of the following dimensions: four to 4 1/2 inches in depth, four to 4 1/2 inches in width, and seven to 11 inches in length.

The blocks shall be so dressed that they may be laid with close joints not exceeding 1/2 of an inch at the top. The head shall show not more than 1/4 inch variation from a true plane, with square corners and sharp edges. The top, bottom and sides shall form right angles at their intersections. The sides and ends shall have no depressions or projections exceeding 1/2 inch.

Laying blocks. The blocks shall be laid in the sand cushion, on edge, end to end, across the roadway at right angles to the curb. They must be set closely and evenly, true to line and grade, with joints broken with a lap of at least two inches. Only practical and competent pavers shall be employed for this work.

Ramming.

After the blocks are laid, they shall be rammed to a solid bearing with uniform surface, true to the roadway on the established grade, any low blocks being taken out by means of tongs and raised by adding to the sand bed, and the whole rammed again to a fair and even surface. No sand shall be placed in the joints; but, if permitted by the Commissioner of Public Works, a small quantity of clean, dry sidewalk grit may be put into the joints, in an amount only sufficient to hold the blocks and prevent them from rocking. The joints shall be adjusted and unsatisfactory blocks taken out with tongs. No pinch bars shall be used except by special permission of the Commissioner of Public Works.

A sufficient number of rammers shall be employed so that all pavement laid may be rammed and joints filled before work ceases each day.

Cement grout filler.

The filler shall be composed of one part of clean, sharp sand and one part of portland cement with enough water added to make a grout of the consistency of thin cream, mixed in a grout mixer to ensure the accurate blending of the ingredients and delivered on the work from a short pipe or other manner satisfactory to the Commissioner of Public Works.

The blocks shall be wet by sprinkling with hose or can and kept moist until the grout is supplied.

The grout shall be poured on the surface and broomed into the joints until filled flush with the surface.

After this grout has subsided into the joints and before the initial set, the surface shall again be treated with a grout of the consistency of thick cream, which shall be broomed smoothly over the surface until the joints are full and flush with the top of the blocks.

On steep grades, where deemed desirable by the Engineer, joints shall be filled to within 1/8 inch of the surface.

No travel shall be allowed on the pavement during construction nor for a period of at least six days after completion.

Asphaltic cement filler.

The joint filler used shall be a mixture of paving cement, described hereafter, and hot dry sand, in the proportion not to exceed one part sand to one part paving cement by volume, or as much sand up to this proportion as the paving cement will carry. The sand shall all pass a ten-mesh sieve. It shall be clean and heated to a temperature of not less than 300° F. nor more than 400° F. and shall be within these limits when mixed with the paving cement. The paving cement shall be heated in kettles, properly equipped with an approved thermometer, to a temperature of not less than 275° F. nor more than 350° F. and shall be poured when between these limits.

The mixture shall be made in a concrete carrier pushcart of seven cubic feet in capacity or other approved receptacle.

Approximately 2 1/4 cubic feet of the hot asphaltic cement shall be poured into the cart, the hot sand then added in the proportion indicated above and the mixture thoroughly stirred with a rake or perforated hoe. The mixture shall then, without delay, be flushed on the surface of the blocks and pushed into the joints by squeegees or other approved means, reflushing or repouring, if necessary, until the joints remain permanently filled, flush with the surface of the pavement, but in no case will any surplus asphalt cement filler be allowed to remain on the top of finished pavement. The asphalt joints will be tested for depth after the pouring is finished and must show at least four inches in depth of asphalt. The cart or containers shall be entirely emptied before refilling.[1]

Editor's Note: Amended at time of adoption of Code; see Ch. 1, General Provisions, Art. I.

Heating appliances; all joints to be poured with filler during the day. The appliances for heating the materials for filling the joints shall be of such efficiency and number as will permit the pourers to follow closely the rammers, and all joints of rammed pavement shall be poured with the filler before the cessation of work for the day.

Asphaltic paving cement. The asphaltic paving cement shall be obtained by the distillation of an asphaltic petroleum at a temperature not exceeding 700° F. and shall comply with the following requirements:

It shall be homogeneous.

The melting point shall not be less than 115° F. nor more than 130° F. (ball-and-ring method).

Solubility in carbon tetrachloride shall not be less than 98 1/2%.

Penetration at 77° F. shall not be less than 60 nor more than 100, the penetration test being made with a No. 2 needle for five seconds under a load of 100 grams; and the penetration at 100° F. shall not exceed 3 1/4 times its penetration at 77° F., the condition of time and load being as above established. The contractor, before beginning work, shall obtain from the Engineer a statement, in writing, as to the penetration desired for any particular contract; and a variation of not more than 10 points either way from this penetration will be permitted.

Ductility at 77° F. shall not be less than 40 centimeters at the penetration called for.

It shall not lose more than 1% by volatilization when maintained at a temperature of 325° F. for five hours, nor shall the penetration of the residue after such heating be less than 1/2 the original penetration.

Period when traffic prohibited. No traffic of any description shall be permitted on the pavement until the joints have been completely filled with bituminous filler, as described, and it has hardened.

§ 104-5 Asphaltic-concrete pavement.

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

Excavation. For asphaltic-concrete pavement, the roadbed shall be excavated to subgrade and thoroughly rolled with a ten-ton roller until the surface of the subgrade is solid and parallel with the proposed finished grade of the pavement. Depth below the finished grade shall be determined by the thickness of the concrete base and the asphaltic-concrete top called for on the plans and in the job specifications.

Concrete base. Upon the subgrade, prepared as above, shall be laid the concrete base, six inches in depth, unless otherwise called for on the plans and in the job specifications.

Pavement to be one-course or two-course. The asphaltic-concrete pavement shall be either one-course of two-and-one-half-inch compacted thickness or two-course of three-inch compacted thickness, as called for on the plans and in the job specifications.

One-course pavement. On the concrete base shall be placed an asphaltic-concrete wearing course, to be leveled, raked and rolled with a ten-ton roller to the satisfaction of the Engineer and to a compacted thickness of 2 1/2 inches.

Two-course pavement.

On the concrete base shall be placed an asphaltic-concrete binder course, to be leveled, raked and rolled with a ten-ton roller to the satisfaction of the Engineer and to a compacted thickness of 1 1/2 inches. The surface of the binder course after compaction shall be 1 1/2 inches below and parallel to the established grade for the finished pavement and shall be free from depressions exceeding 1/4 inch as measured with a ten-foot straightedge paralleling the center line of the street.

On the compacted binder course shall be placed a wearing course of asphaltic concrete, either graded stone aggregate mix or sheet mix, as called for in the job specifications. Such wearing course shall be leveled, raked and rolled with a ten-ton roller to the satisfaction of the Commissioner of the Department of Public Works and to a compacted thickness of 1 1/2 inches. The surface of the wearing course after compactions shall conform to the established grade for the finished pavement and shall be free from depressions exceeding 1/8 inch, as measured with a ten-foot straightedge paralleling the center line of the street.

Materials.

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 I below.

In the wearing course, the sheet mix 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 subsection 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 Subsection I below.

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 I below.

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.

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

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

(7)

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

Spreading and rolling.

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.

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.

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 marks 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.

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

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

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.

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.

§ 104-6 Reinforced concrete pavement.

Preparation of subgrade. For reinforced concrete pavement, the subgrade of the roadway shall be prepared for the pavement by excavating or filling and shall be thoroughly compacted with a ten-ton roller and finished true to cross section with its surface parallel to and the required depth below the finished pavement surface.

Description. The pavement shall be eight inches thick, unless otherwise called for on the plans or in the job specifications, and shall be reinforced with steel bars or steel-wire fabric of the size and spacing called for on the plans or in the job specifications.

Pavement concrete, generally. All the requirements of the standard city specifications for controlled concrete as to ingredients, composition and design, mixing and placing shall apply to pavement concrete, with the additional requirements set out in this section.

Class of concrete. Concrete shall be proportioned approximately as for Class B concrete (Table C of the Standard Specifications), except that it shall be required to give a flexural strength of not less than 550 pounds per square inch at the age of 14 days when tested by the American Society for Testing and Materials Standard Method of Test for Flexural Strength of Concrete (using simple beam with third-point loading) Designation C-78, as last amended.

Cement. Treated normal cement (air-entraining), Type 1-A, shall be used, unless otherwise called for in the job specifications.

Equipment. All equipment for mixing and placing concrete must be on the site and inspected and approved by the Engineer before concreting operations are started.

Placing.

Before any concrete is placed, it shall be tested and approved by the Engineer. The subgrade, if dry, shall be wetted by sprinkling so that a uniform, moist and compacted foundation is provided. During the placing of concrete, a roller weighing not less than five tons shall be maintained in readiness to reroll any defective areas in the subgrade.

The concrete shall be deposited on the subgrade rapidly in successive batches directly from the mixer by means of an approved broom and bucket or other acceptable discharging device and shall be distributed to the required depth and for the entire width of the slab by shoveling or other approved method. Rakes shall not be used for handling concrete, and special care shall be exercised to prevent segregation.

Unless otherwise specified or permitted by the Engineer, steel reinforcement mats shall be installed by the strike-off method whereby the concrete is first struck off by means of a template to the required depth below the finished grade of the pavement, the reinforcement is then placed and the remaining concrete placed on top of the steel and finished in the required manner.

The placing of steel and the top layer of concrete shall be done immediately after the first strike-off. Should any portions of the bottom layer of concrete develop initial set before being covered with the top layer, such portions shall be removed and replaced with newly mixed concrete at the contractor's expense.

Finishing.

Competent concrete finishers shall be employed at all times for this operation.

The surface of the concrete shall be screeded by means of an approved transverse machine in charge of an experienced operator. Two machines shall be used whenever, in the judgment of the Engineer, paving is progressing too rapidly to be properly finished by one machine.

If hand-finishing is authorized, the surface of the concrete shall be struck off by means of two transverse screeds. The first or forward screed shall be 12 inches in width, at least two feet longer than the width of the slab, and shall be constructed of a channel or angle irons weighing not less than 20 pounds per foot. It shall be operated by four men. The second or follow-up screed shall be 10 inches in width, of the same length and construction as the first screed, shall weigh not less than 15 pounds per foot and shall be operated by two men. The screeds shall be moved forward with a longitudinal and crosswise movement. Tamping shall be done only after screeding and then only where the mortar fails to properly come to the surface by screeding. The second screeding shall follow in close succession to the first, care being taken to keep the screed bearing directly on the side forms at all times and to secure a smooth and even surface.

After the transverse screeding has been completed, the concrete surface shall be leveled and finished by the use of a mechanical longitudinal or diagonal screed of a type approved by the Engineer or by an approved type of longitudinal screed hand-operated from bridges. Each section floated shall overlap the one previously floated by not less than five feet.

Following the longitudinal screeding or floating, and if ordered by the Engineer, the surface shall be scraped with a metal straightedge on a long handle operated from the edge of the pavement so as to remove all excess mortar from the surface.

After the screeding and scraping has been completed, the concrete shall be finished by using a belt of wood, canvas or rubber not less than 10 nor more than 12 inches in width. The belt shall be worked with a longitudinal and crosswise motion. Care shall be observed in the use of the belt so as not to permit the edges to dig into the surface of the concrete or to work the crown out of the pavement.

(7)

Immediately after the concrete has been belted, a trowel shall be inserted between the form and the concrete for a depth of three inches for the entire length of the slab and both sides of the joints.

(8)

The surface of the pavement shall be tested after the belting with a ten-foot straightedge laid parallel with the side of the pavement, and any depressions exceeding 1/4 of an inch in depth shall be corrected to the satisfaction of the Engineer.

(9)

As soon as the concrete is sufficiently set, the surface shall be given a broom finish, the broom being drawn across the surface in not more than two strokes per width of broom.

(10)

Necessary hand-finishing of joints and surface irregularities shall be done with a wooden float from a bridge which shall not rest on the concrete at any point. The longitudinal edges and all joints of the concrete slab shall be carefully finished with an approved edging tool.

(11)

In edging concrete placed adjacent to a finished slab, an edging tool having a lip at least 1/4 inch deeper than the tool used on the finished slab shall be used.

Reinforcement.

Reinforcing steel for the pavement shall be free from scale, grease, injurious rust or other foreign substances which will tend to prevent proper bonding to the concrete. The reinforcement shall be welded steel-wire fabric or steel-bar mats of the design, weight and dimensions as shown on the plan. The contractor shall have the option between wire-fabric or bar mats.

Reinforcement shall consist of longitudinal and transverse members at right angles. All points of intersection of the members shall be firmly connected in an approved manner.

All such reinforcement shall be protected from moisture and shall not be delivered upon the work until 10 days previous to placing.

All reinforcements shall be approved by the Engineer as to condition before being placed.

Steel fabric shall meet the requirements given for cold-drawn steel wire for concrete reinforcement in the standard specifications of the American Society for Testing and Materials Serial Designation A82-34, except that a sample shall be taken as directed by the Engineer. All welded steel fabric shall meet these requirements after fabrication.

Bar reinforcement shall be open-hearth and shall consist of approved deformed bars of intermediate grade rolled from new billets (no rerolled material or cold twisted bars will be accepted) and shall withstand being bent cold through 180° without cracking on the outside of the bent portion. When the steel to be tested is under 3/4 inch in diameter, the test specimen shall be bent around a pin whose diameter is equal to the diameter of the test specimen. If it is 3/4 inch or over in diameter, it shall be bent around a pin whose diameter is twice the diameter of the test specimen.

(7)

In addition to these requirements, bars shall also meet all other requirements given for intermediate grade reinforcement bars in the current standard specifications of the American Society for Testing and Materials Serial Designation A-15, except that samples shall be taken and tests made as directed by the Engineer.

(8)

If bar mats are to be fabricated by welding, plain bars may be used instead of deformed.

Joints.

Joints of the various types shall be placed and finished as shown on the plan or as directed by the Engineer. Dowels and tie bars shall be placed at such joints as indicated on the plans and of the size and type called for.

Expansion joints shall be placed at all street intersections and elsewhere at four-hundred-foot intervals, unless otherwise called for.

Transverse contraction joints shall be placed at twenty-foot intervals, unless otherwise called for.

Construction joints shall be placed where shown on the plan or directed. Transverse construction joints at the end of a day's concreting shall in no case be less than 10 feet from the nearest regularly located transverse joint.

An approved premoulded, nonextruding joint filler shall be used at all expansion joints. All joints shall be scaled with an approved bituminous before the pavement is opened to traffic.

All joints, dowels, bars and joint fillers shall be according to details on the plan or as specified in the job specifications.

Forms.

Forms for the pavement shall be made of steel and have a minimum length of 10 feet for tangents and for curves of a radius of 400 feet or more. For curves of a radius less than 400 feet, wooden side forms of two-inch seasoned surfaced planks or steel side forms of the proper curvature shall be used.

These forms shall be of a depth equal to the depth of the concrete. Steel forms shall have a minimum width of base equal to at least the height of the form. The material used in manufacturing metal side forms shall be at least 3/16 of an inch in thickness. All forms shall be of approved section with a vertical face rounded on the upper corner to not more than 1/4 of an inch radius. Forms shall have a joint connection to ensure unbroken lines across the joint.

All forms shall be straight, free from bends and warps at all times and shall be cleaned thoroughly and oiled before concrete is placed against them, this cleaning and oiling being repeated daily as forms are moved ahead. The forms shall rest firmly on the thoroughly compacted subgrade throughout the entire length, shall be joined neatly and tightly and staked securely to line and grade at least 500 feet on each side in advance of the point of placing concrete by using at least three bracing pins or stakes to each ten-foot length of side form, so that they will resist the pressure of the concrete and the impact of the temper without springing. Where wood forms are used, there shall be additional stakes to prevent bulging, if so directed by the Engineer. Forms for the curbing shall be of materials similar to those specified for the pavement and shall be so designed as to permit secure fastenings to the pavement forms, which fastenings shall be so constructed that they will not obstruct the correct finishing and edging of the top of the curbing. If wooden forms are used, the stock shall not be less than 1 1/4 inches in thickness.

Protection and curing.

Traffic shall be excluded from the concrete by the erection and maintenance of substantial barricades for the entire period during which the pavement is to remain closed to traffic, and logs, ties or other obstructions shall be placed at proper intervals so that traffic cannot turn out or run on the pavement.

During threatening weather, the concrete shall be protected with canvas as soon as it is finished. Sufficient canvas to cover 200 linear feet of pavement slab shall be provided and available for immediate use.

Curing shall be done, at the contractor's option, in accordance with any of the following methods:

(a)

Quilted covers.

Approved quilted covers shall consist of outer covering materials of burlap, cotton or other approved fabrics, the bottom and top cover of which shall each weigh at least six ounces per square yard of fabric, and an inner layer of cotton batting or other approved material weighing at least eight ounces per square yard. These mats shall be quilted to securely hold the inner cotton batting lining in place and shall be two feet greater in width, after shrinking, than the pavement slabs being cured and shall be securely held in place and weighted down to completely cover the edges as well as the top of the pavement. Adjoining quilts shall be lapped at least 12 inches.

[2]

These quilted covers shall be laid directly on the pavement as soon as the brooming is completed. They shall be thoroughly wet and kept wet for the period shown on the following Table 104-1.

(b)

Bituminous or colorless cure.

Single-spray equipment, of an approved type, will be permitted if the coverage secured is even and satisfactory to the Engineer. On any work where the coverage is not even or for any reason unsatisfactory to the Engineer, multiple-spray equipment of an approved type must be used.

[2]

The distributor shall be so constructed as to cover the entire width of the slab at one time, and the nozzles shall be so arranged that each spray will overlap the next by 1/2 its width.

[3]

The concrete shall be protected with two layers of burlap (or quilted covers as described above) laid directly on the concrete as soon as completed. The strips shall be at least two feet wider than the concrete and shall overlap not less than 12 inches and must be thoroughly wet when placed. The cover shall be left on the surface for at least 24 hours and shall be kept wet until removed.

[4]

Immediately after the cover is removed, the entire surface, including the edges and side, shall be treated with bituminous material A or B meeting the following requirements:

		A	B
Homogeneous		Yes	Yes
Water		None	None
Sp. gr. 77° F./77° F.		0.86-0.90	0.83-0.98
Furol vis. at 100° F.		25-	50-
Furol vis. at 122° F.		_____	_____

Distillation % vol.:
	320° F.	10+	_____
	374° F.	25+	20+
	437° F.	35+	35+
	600° F.	45+	45+
	680° F.	55-	60-

Residue:
	Pen. 100 g., 5 sec. 77° F.	60-120	50-110
	Pen. 200 g., 1 min. 39.2° F.	_____	_____
	% Pen. 39.2° F./77° F.	30+	30+
	Sol. in CS %	99.5	90+
	Ductility	60+	60+

[5]

The bituminous material shall be applied uniformly to the surface at the rate of 1/10 gallon per square yard by means of an approved pressure distributor. The rate of application may be increased should the method of application of any type of material fail to give an even coating when applied at the rate specified. Any light-brown spots on the surface shall receive additional coating.

[6]

Colorless coating. The contractor shall coat the entire top surface of the slab with a colorless curing compound, applied uniformly by means of an approved pressure spray distributor, at the rate of 30 square yards per gallon of material. The material shall be so applied that the concrete surface is completely coated and sealed at one application.

[7]

When first applied, the material shall darken the surface slightly. As the concrete hardens, the material shall dry to a transparent, flexible and impervious film. The surface of the hardened concrete shall not be discolored in any way.

[8]

The application shall be made immediately after the concrete has been deposited and finished and any surplus water that has collected on the surface thereof has disappeared but before any marked dehydration or surface checking has started to occur.

[9]

Immediately after the forms have been removed, the sides and edges shall be treated with colorless curing compound.

[10]

After the surface and sides have been coated as specified, no further attention will be required, other than adequately protecting the concrete from traffic for the period of time required by the Engineer.

[11]

Colorless curing compound. The sealing compound shall consist of a straw-colored liquid having the following characteristics:

[a]

Viscosity at 64° F., 50 to 75 second Saybolt-Universal.

[b]

Specific gravity at 64° F., 0.87 to 0.89, with a Reimann plummet on an analytical balance.

[c]

Total solids not less than 45% by weight.

[d]

The compound shall not freeze when cooled to zero degrees Fahrenheit

[e]

The compound, when cooled to 28° F. and then warmed to 100° F., shall show no separation.

[f]

The compound can show slight haze when cooled below 54° F.

[12]

The material shall form a thin, flexible, transparent film within 12 minutes at 70° F. when spread on a dry concrete surface in reasonably dry atmosphere.

[13]

It shall form a continuous coherent film (or membrane) within 12 minutes when spread in a thin film on wet concrete having a two-inch slump at 70° F. in reasonably dry atmosphere. This film may be semitransparent.

[14]

The compound shall not mix but shall form a continuous coherent surface film when spread or poured on water.

[15]

When dry, the film shall be transparent, flexible and without breaks or pinholes.

[16]

The dry film shall be substantially water- and moistureproof.

[17]

The contractor, if he cures the pavement by a patented method, shall include in the unit price bid the cost of any royalties paid to the patentees.

(c)

Hay and water cure.