[Amended 11-24-2008 by L.L. No. 4-2008]
A.
This method is to be used only with prior written
approval of the Town Superintendent of Highways. Bituminous macadam
pavement shall consist of a base course, minimum depth of three inches,
and a surface course, minimum depth of 2 1/2 inches.
B.
Construction of the base course shall be as follows:
The subbase must be cleaned of all loose or foreign materials and
must be free of any soft or unstable area. Coarse aggregate, of No.
3 and No. 4A stone, meeting the requirements of Section 703-02, Coarse
Aggregate, of the current Standard Specifications of New York State
Department of Transportation, shall then be spread uniformly in loose
layers and rolled with a three-wheel roller weighing no less than
10 tons. Rolling shall start longitudinally at the edge of the pavement
with at least 1/2 of the rear wheel overlapping the shoulder and continuing
toward the center of the pavement with an overlap of at least 1/2
of the width of the rear wheel on successive trips. Rolling shall
continue until fragments of aggregate are finely interlocked. Thickness
of this course shall be three inches after compaction. Upon completion
of this course, an application of bituminous material of the kind
specified in the plans, 1.50 gallons per square yard, shall be made
by means of pressure distributors. Immediately after this application,
fine aggregate of No. 1 stone, meeting the requirements of Section
703-01, Fine Aggregate, of the current Standard Specifications of
New York State Department of Transportation, shall be applied in sufficient
quantity to prevent the roller wheels from sticking and sufficient
also to fill the surface voids. The surface shall then be rolled until
it is firmly bound together and shows no movement under the roller.
C.
The construction procedure for the surface course
is similar to that of the base course. After the base course has been
completed, course aggregate of No. 2 and No. 3 stone, meeting the
requirements of Section 703-02 of current Standard Specifications
of New York State Department of Transportation, shall be spread to
thickness of 2 1/2 inches and rolled with a three-wheeled roller
weighing no less than 10 tons. Immediately thereafter, bituminous
material of the kind specified in the plans, at the rate of 1.6 gallons
per square yard, shall be applied to the surface. Immediately after
bituminous material has been applied and before it has time to break,
No. 1 size stone, meeting the requirements of Section 703-01, Fine
Aggregate, of Standard Specifications of New York State Department
of Transportation, shall be spread over the surface (20 to 35 pounds
per square yard) and be compacted with roller weighing no less than
10 tons. During the rolling process, additional No. 1 stone shall
be applied and broomed about until the voids in No. 2 and No. 3 stone
are entirely filled. After rolling has been completed, a second application
of bituminous material shall then be immediately covered with No.
1 stone (15 to 25 pounds per square yard) and again rolled with a
roller weighing no less than 10 tons. Additional No. 1 stone shall
be applied and broomed about until the voids in the surface are filled
and any excess emulsion asphalt has been absorbed. Rolling shall be
continued until the course of stone is thoroughly compacted and its
surface is uniform and true to the established grade and cross section.
D.
Liquid bituminous material shall only be applied between
April 15 and November 15 and when the stone is dry and clean, free
of frost and the surface temperature is above 50º F. or with
written permission of the Town Superintendent of Highways.
A.
The contractor shall construct a two-course bituminous
concrete pavement laid to conform to the required grade, thickness
and cross section shown on the plans and specifications.
B.
Materials and methods of construction shall conform
to Section 401 of current Standard Specifications of the New York
State Department of Transportation. The base course shall be Type
1, and the wearing course (top) shall be Type 6F.
C.
After the base paving course has been thoroughly cleaned
of all foreign material, an asphaltic concrete top course shall be
uniformly spread by a self-propelled mechanical spreader with tamping
bars and a heating unit in sufficient depth as to provide a finished
compacted thickness after rolling thoroughly with a ten-ton roller.
D.
After the base course has been completed and thoroughly
cleaned of foreign material and a tack coat of asphalt emulsion applied
to the surface at the rate of 0.1 to 0.2 gallon per square yard, in
the event that the base course has been subject to traffic for an
extended period of time, a final wearing course of fine asphaltic
concrete shall be uniformly spread by a self-propelled mechanical
spreader equipped with tamping bars and a heating unit and in sufficient
depth as to provide the required finished compacted thickness after
rolling thoroughly with a two- or three-wheel tandem roller weighing
approximately 10 tons.
E.
Extreme care shall be exercised in the placing of
bituminous concrete to ensure that all longitudinal joints shall be
lapped in the placing of adjoining strips and that all lateral joints
are trimmed before continuing with the placing of additional materials
on that strip.
F.
Asphalt concrete may be applied year round. Written
permission is required from the Town Superintendent of Highways between
November 15 and April 15 or when the surface temperature is below
45º F. Core samples must be provided at the request of the Town
Superintendent of Highways.
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Bituminous Plant Mixtures
| ||||||
|---|---|---|---|---|---|---|
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Base Type 1
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Top Type 6, 6F
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|
Mixture Requirements
|
General Limits Percent Passing
|
Job Mix Tolerance
(percent)
|
General Limits Percent Passing
|
Job Mix Tolerance
(percent)
| ||
|
Screen sizes
| ||||||
|
2 inch
|
100%
|
—
| ||||
|
1 1/2 inch
|
90% to 100%
|
—
| ||||
|
1 inch
|
78% to 95%
|
±5%
|
100%
|
—
| ||
|
1/2 inch
|
57% to 84%
|
±6%
|
90% to 100%
|
—
| ||
|
1/4 inch
|
40% to 72%
|
±7%
|
65% to 85%
|
±7%
| ||
|
1/8 inch
|
26% to 57%
|
±7%
|
36% to 65%
|
±7%
| ||
|
No. 20
|
12% to 36%
|
±7%
|
15% to 39%
|
±7%
| ||
|
No. 40
|
8% to 25%
|
±7%
|
8% to 27%
|
±7%
| ||
|
No. 80
|
4% to 16%
|
±4%
|
4% to 16%
|
±4%
| ||
|
No. 200
|
2% to 8%
|
±2%
|
2% to 6%
|
±2%
| ||
|
Asphalt cement, 0/0
|
4.0% to 6.0%
|
±0.4%
|
5.8% to 7.0%
|
±0.4%
| ||
|
Asphalt cement
| ||||||
|
Upstate
|
AC-10
|
AC-10
| ||||
|
Grade and No.
|
702-02
|
702-02
| ||||
|
Asphalt cement
| ||||||
|
Downstate
|
AC-20
|
AC-20
| ||||
|
Grade and No.
|
702-03
|
702-03
| ||||
|
Mixing and placing temperature range (degrees
Fahrenheit)
|
250 to 325
|
250 to 325
| ||||
|
Description and typical uses
|
Dense base course with relatively low permeability
|
Dense, granular texture for rural, suburban
and urban arterial roadways
| ||||
A.
The contractor shall construct bituminous surface
treatment (double course) as specified in approved plans and meeting
the requirements of Section 410-3.02 of current Standard Specifications
of New York State Department of Transportation.
B.
Shoulders of highways with bituminous macadam pavement
shall be treated with an additional surface treatment for surface
texture and color contrast meeting the requirements of Section 410-3.04
of the current Standard Specifications of New York State Department
of Transportation.
With the approval of the Town Highway Superintendent, roads meeting the specifications set forth in § 93-8D may be surfaced with gravel.
A.
A surface course of sized or processed crushed gravel
of not less than two inches, after compaction must be provided.
B.
All gravel roads shall be graded so that the center
crown is not less than four inches, or more than six inches higher
than the outer edge of the roadway, depending on local conditions.
