July 22, 1994

Contract #TW0592

SPECIAL SPECIFICATION

SECTION 02513-S

[ASPHALT CONCRETE PAVEMENT]{.underline}

Page

[PART 1 - GENERAL]{.underline}

1.01 Description Of Work 2

1.02 Submittals 2

PART 2 - MATERIAL

2.01 Asphalt 2

2.02 Tack Coat 2

2.03 Aggregate 2

2.04 Proportioning 3

2.05 Pavement Markings 4

2.06 Testing 4

PART 3. EXECUTION

3.01 Tack Coat 4

3.02 Placing Asphalt Concrete Mixture 5

3.03 Rolling 6

3.04 Sampling And Testing Pavement 6

3.05 Joints 6

3.06 Manholes And Valve Covers 7

3.07 Smoothness 7

3.08 Pavement Markings 7

SPECIAL SPECIFICATION

SECTION 02513-S

[ASPHALT CONCRETE PAVEMENT]{.underline}

# PART 1 - GENERAL

## 1.01 [DESCRIPTION OF WORK]{.underline}

A. Asphalt concrete pavement shall consist of a mixture of mineral
aggregate and asphalt, mixed at a central mixing plant and spread and
compacted on a prepared subgrade or base in conformity with the lines,
grades, and dimensions shown on the plans or as specified.

B. Mixing procedures and specifications shall be the same as required by
the City of Albuquerque standard specifications for Public Works
Construction.

## 1.02 [SUBMITTALS]{.underline}

Provide copies of material certificates signed by the material producer
and contractor, certifying that each material item complies with
specified requirements.

# PART 2 - MATERIAL

## 2.01 [ASPHALT]{.underline}

The asphalt to be mixed with the mineral aggregate shall be paving
asphalt (asphalt cement) conforming to Section 110, New Mexico Public
Works, and shall be grade AC-20. AC-10 or 85-100 asphalt.

## 2.02 [TACK COAT]{.underline}

Tack coat shall consist of cationic emulsified asphalt as specified in
Section 112, New Mexico Public Works.

## 2.03 [AGGREGATE]{.underline}

A. Asphalt concrete aggregate will be tested in accordance with the
following AASHTO methods:

> Mechanical Analysis AASHTO T 30
>
> Passing No. 200 Sieve AASHTO T 27
>
> Liquid Limit AASHTO T 89
>
> Los Angeles Abrasion AASHTO T 96
>
> Soundness (Magnesium Sulfate) AASHTO T 104

B. Unless otherwise shown on the plans, asphalt concrete aggregate shall
conform with all of the requirements for the classes herein provided.

> ASPHALT CONCRETE AGGREGATE CLASSIFICATION PERCENT PASSING
>
> Thickness 1\" or less
>
> Greater than 1\" or Surface
>
> Construction
>
> Sieve Percent Percent
>
> [Desig.]{.underline} [Passing Passing]{.underline}
>
> 2 3/4\" - -
>
> 2 1/2\" - -
>
> 2\" - -
>
> 1 1/2\" - -
>
> 1\" 100 -
>
> 3/4\" 70-100 -
>
> 1/2\" 55-85 100
>
> 3/8\" - 70-100
>
> No. 4 30-55 45-70
>
> No. 8 22-42 33-54
>
> No. 40 10-25 15-30
>
> No. 200 3-8 4-10

C. Asphalt concrete aggregate shall have a percent of wear of 40 or less
and the course aggregate shall have a soundness loss of 15 or less. All
material passing the No. 40 sieve shall be non-plastic. The amount of
crushing shall be regulated so that at least 60 percent, by dry weight,
of the plus No. 4 sieve material shall have minimum of 2 fractured
faces.

## 2.04 [PROPORTIONING]{.underline}

The job-mix formula shall be designed to achieve the following test
properties.

Stability

(Marshall-75 blows per face) 1800 lb. min.

Flow (Marshall) 16 or less

Percent voids 3-7

Percent voides filled with

asphalt 65-80

Percent asphalt cement 5-6

Compaction - percent of

laboratory density 95 min.

If mixture produced varies from the designated amounts by more than the
following tolerances, proper changes shall be made until subsequent
mixtures are within those tolerances.

Passing No. 4 and larger sieves ±7 percent

Passing No. 8 to No. 100 sieves (incl.) ±4 percent

Passing No. 200 sieve ±2 percent

Bitumen (tank strap method) ±0.3 percent

Bitumen (extraction method) ±0.5 percent

Temperature of Mixture ±20 F

Hydrated Lime ±0.3 percent

Portland Cement ±0.3 percent

## 2.05 [PAVEMENT MARKINGS]{.underline}

A. Markings shall be with traffic paint. Adhesive marking tape may be
used when called out or when approved by the ENGINEER.

B. Paint and tape shall be in accordance with the current New Mexico
State Highway Department Standard Specifications.

## 2.06 [TESTING]{.underline}

The frequency of and the type of test specimens required will be as
required by the SNL INSPECTOR. Testing will be paid by Sandia. Retesting
due to failure shall be the responsibility of the CONTRACTOR. The
Contractor shall notify the Sandia Contracting Representative (SCR) two
days in advance when test specimens will be required.

# PART 3. EXECUTION

## 3.01 [TACK COAT]{.underline}

A. If the asphalt concrete pavement is being constructed directly upon
an existing hard-surfaced pavement, a tack coat shall be evenly and
uniformly applied to such existing pavement preceding the placing of the
asphalt concrete. The surface shall be free of water, all foreign
material, or dust when the tack coat is applied. No greater area shall
be treated in any one day than will be covered by the asphalt concrete
during the same day. Traffic will not be permitted over tack coating.

B. Weather Limitations. Tack coat shall not be applied on a wet surface;
during wet weather; nor after sunset; nor when the atmospheric
temperature is below 40 degrees F.

C. Tack coat application rate shall be 0.10 gallon per square yard, or
as designated by the INSPECTOR.

D. A similar tack coat shall be applied to the surface of any course if,
in the opinion of the INSPECTOR, the surface is such that a satisfactory
bond cannot be obtained between it and the succeeding course.

E. The contact surfaces of all cold pavement joints, curbs, gutters,
manholes, and the like shall be painted with a tack coat immediately
before the adjoining asphalt concrete is placed. Surfaces where a tack
coat is required shall be cleaned to the satisfaction of the INSPECTOR
before the tack coat is applied.

## 3.02 [PLACING ASPHALT CONCRETE MIXTURE]{.underline}

A. At the time of delivery to the site of the work, the temperature of
mixture shall be not lower than that required to obtain the density
specified, nor lower than 220 degrees F.

B. Bituminous mixtures shall be covered with tarpaulins while being
hauled. The tarpaulins shall completely cover the load and be firmly
tied down. Mixtures shall be delivered to site of the work without
segregation of the ingredients and within the temperature range
specified in this section.

C. Asphalt concrete may be placed when the temperature is 40 F and
rising and the weather is favorable as determined by the INSPECTOR. None
may be placed in wet weather or on a wet surface. The asphalt concrete
shall be evenly spread upon the subgrade or base to such a depth that
after rolling it will be of the specified cross section and grade of the
course being constructed.

D. Depositing and spreading of the asphalt concrete shall be
accomplished by means of self-propelled mechanical spreading and
finishing machine designed especially for that purpose. The machine
shall be equipped with a vibrating or tramping screen capable of being
accurately regulated and adjusted to distribute a layer of the material
to a definite predetermined thickness and template. The paving machine
shall be equipped with an automatic leveling device controlled from an
external guide. The initial pass for each course shall be made using a
paver equipped with a 40 foot minimum external reference, except this
shall not apply when asphaltic concrete is placed adjacent to concrete
pavement or gutter. Subsequent passes shall utilize a matching device of
1 foot minimum length, riding on the adjacent lift.

E. All joints shall be completely bonded.

F. In narrow, deep, or irregular sections, turnouts, or driveways, where
it is impractical to spread and finish the base and level the surface
mixtures by machine methods, the CONTRACTOR may use spreading equipment
or acceptable hand methods approved by the INSPECTOR.

G. DRAINAGE. All paving shall be laid to drain freely and promptly.
Walks shall drain off to sides, and parking areas shall blend with
roadway pavements to provide clear and unobstructed drainage to the same
grades and gradients which existed prior to this contract work.

## 3.03 [ROLLING]{.underline}

A. Asphalt concrete shall be thoroughly compacted by rolling. Both steel
wheel and pneumatic rollers shall be used.

B. Rolling shall be commenced with a steel wheel roller along the lower
edge of the area to be rolled and be continued until the edge is
thoroughly compacted, after which the roller shall be gradually advanced
to the crown point, both sides being rolled in a like manner. Rolling
shall be continued with steel and pneumatic wheel rollers until the
layer has become thoroughly compacted throughout and is true to grade
and cross section.

C. Rollers shall be maintained in good mechanical condition, and those
that cannot be operated without jerking or driven along a straight path
shall not be used. No leakage from any roller shall be allowed to come
in contact with the pavement being constructed nor shall any roller be
permitted to stand motionless on any portion of the work before it has
been properly compacted. Steel roller wheels shall be treated with water
or oil to prevent the adherence of the asphalt concrete, and water or
oil may be used on pneumatic-tired rollers but the quantity used must
not be such as to be detrimental to the surface being rolled.

D. Rolling of both the base course and surface course shall be continued
until all roller marks are eliminated and a density of at least 96% of
the density of a laboratory specimen of the same mixture. In areas not
accessible to the roller, the mixture shall be thoroughly compacted with
hand operated mechanical tampers. Any mixture that becomes mixed with
foreign material or in any way is defective shall be removed, replaced
with fresh mixture, and compacted to the density of the surrounding
pavement.

## 3.04 [SAMPLING AND TESTING PAVEMENT]{.underline}

The minimum test requirements for the pavement shall consist of a test
for:

A. The gradation of extracted aggregates.

B. Density of compacted pavement.

C. Asphalt content by extraction (if not previously controlled and
verified by tank strap test).

D. A test report of the current Marshall mix design prepared by an
independent laboratory.

## 3.05 [JOINTS]{.underline}

A. Care shall be exercised in connection with the construction of joints
to insure that the surface of the pavement is true to grade and cross
section. In making the joint along any adjoining edge such as a curb,
gutter, or an adjoining pavement and after the hot mixture is placed by
the finishing machine, sufficient hot material shall be carried back to
fill any space left open. This joint shall be properly \"set up\" with
the back of a rake at proper height and level to receive the maximum
compression under rolling. The work of \"setting up\" this joint shall
be performed by competent workmen who are capable of making a correct,
clean, and neat joint.

B. Longitudinal and transverse joints shall be made in a careful manner.
Well-bonded and sealed joints are required. Joints between old and new
pavements or between successive days\' work shall be carefully made in
such a manner as to insure a thorough and continuous bond between the
old and new surfaces. In the case of surface course, the edge of the old
surface course shall be cut back for its full depth so as to expose a
fresh surface and, if necessary to obtain a well-bonded joint, shall be
painted with a tack coat after which the hot surface mixture shall be
placed in contact with it and raked to a proper depth and grade. Before
placing mixture against contact surfaces of curbs, gutters, headers,
manholes, etc., they shall be painted with a tack coat.

C. No asphalt concrete surface course shall be placed which cannot be
finished within daylight hours of the same day it is laid unless
otherwise specified or directed by the INSPECTOR.

## 3.06 [MANHOLES AND VALVE COVERS]{.underline}

Manhole frames and valve covers shall be raised or lowered prior to
placing the surface course. The CONTRACTOR may use extension rings or
other methods acceptable to the INSPECTOR. All manhole covers shall be
clean of asphalt.

## 3.07 [SMOOTHNESS]{.underline}

Upon completion, the pavement shall be true to grade and cross section.
Except at intersections or any changes of grade, when a 10 foot straight
edge is laid on the finished surface parallel to the centerline of the
roadway, the surface shall not vary from the edge of the straight edge
more than 3/16 inch. Areas that are not within this tolerance shall be
brought to grade immediately following the initial rolling. After the
completion of final rolling, the smoothness of the course shall be
checked, and the irregularities that exceed the specified tolerances or
that retain water on the surface shall be corrected by removing the
defective work and replacing with new material as directed by the
INSPECTOR at the expense of the CONTRACTOR.

## 3.08 [PAVEMENT MARKINGS]{.underline}

A. This work shall consist of furnishing and placing permanent markings
in substantial compliance with the Manual on Uniform Traffic Control
Devices, Sandia specifications and as shown on the plans.

B. Use 4 inch wide stripe when marking parking spaces. Unless specified,
use 6 inch wide stripe elsewhere.

C. Crosswalks shall be in accordance with the Sandia Standard Drawing.

END OF SECTION