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Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

All materials, labor, equipment, and transportation for the following is considered subsidiary to
this item: mobilization and demobilization, street sweeping, installing and removing plastic on
manhole and service entrances, and tack coat.

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Technical Specifications iIFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

ITEM 405.11 - CRACK SEALING

A. SCOPE

The work covered by this section of the specification consists of furnishing all materials, labor,
transportation, and equipment necessary to perform all operations in connection with the
cleaning and sealing of construction and random cracks in bituminous concrete pavements,
including vegetation removal and sterilization of cracks, where necessary.

B. MATERIAL

Crack sealant shall be a modified asphalt-fiber compound designed specifically for improving
the strength and performance of the parent asphalt sealant.

Asphalt Binder

The asphalt binder shall consist of a blend of neat asphalt binder, chemically modified crumb
rubber (CMCR), and a polymer package, all of which meet the following specifications:

- The binder will meet PG 64-28E requirements after modification including:
- PG grade requirements of AASHTO M320
- Requirements of AASHTO TP70/MP19
- Modification, at a minimum, shall consist of 7% crumb rubber, and the maximum particle
size for the recycled tire rubber shall be 80 mesh (#80 sieve)

The asphalt supplier shall provide testing for both the neat and modified asphalt binders
See below for typical modified test results for 64-28E with crumb rubber:

DSR ORIGINAL: kPa>1.00 @ 64° C. Fail temp = 76+° C

DSR RTFO: kPa >2.20 @ 64° C. Fail temp = 76+° C

MSCR: JNR (MSCR unit of measure): 3.2 E <0.5% @ 64° C
R3200 (Average % Recovery): >70%

DSR PAV: kPa <6000 @ 64° C

BBR: Stiffness <300 @ -18° C. M-Value >0.300 @ -18° C

Fiber reinforcing materials shall be short-length polyester fibers having the following properties:

Length* 0.25 in. + 0.02 in.

Elongation at Break (ASTM D2256-90) 35% + 3%

Melting Point (ASTM D3418-82) >475 degrees F (246 degrees C)
Crimps/Inch (ASTM D3937-90) None

Cross Section Round

Denier (ASTM D1577-90) 4.5 Nominal dpf

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Technical Specifications | IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

Tensile Strength (ASTM D2256-90) >70,000 psi

Diameter 0.0008 in. **

Specific Gravity (ASTM D792-91) 1.32 to 1.40

* At temperatures ranging from ambient to maximum finished product mix
temperature

** Subject to Normal Variations

The modified asphalt-fiber compound shall be mixed at a rate of 8% fiber weight to weight of
asphalt cement. This compound having the same chemical base provides compatibility and
exhibits excellent bond strengths. The fiber functions to re-distribute high stress and strain
concentrations that are imposed on the sealant by thermal sources, traffic loading, etc.

C, EQUIPMENT

Equipment used in the performance of the work required by this section of the specification shall
be subject to approval by the Owner, and maintained in a satisfactory working condition at all
times.

Air Compressor: Air compressors shall be capable of furnishing not less than 100 cubic feet of
air per minute at not less than 90 Ibs. per square inch pressure at the nozzle. The compressor
shall be equipped with traps that will maintain the compressed air free of oil and water.

Manually operated, gas powered air-broom or self-propelled sweeper: It shall be designed
especially for use in cleaning highway and airfield pavements shall be used to remove debris, dirt
and dust from the cracks.

Melter: The unit used to melt or maintain the crack sealant compound at the recommended
application temperature shall be the indirect fired type. It shall be equipped with a remote heat
exchanger and hot oil circulation pump capable of maintaining a consistent temperature of the
heat transfer oil. The heat transfer oil shall be circulated to all sides and the bottom of the vat
containing the crack sealant compound making a continuous loop back to the heat exchanger and
having a flash point of not less than 600 degrees F. The melter shall be equipped with a
satisfactory means of agitating the crack sealant at all times. This may be accomplished by
continuous stirring with mechanically operated paddles and/or by a circulating gear pump
attached to the melter. The melter must be equipped with a thermostatic control calibrated
between 200 degrees F and 550 degrees F, and must be capable of pumping an 8% fiber content
blend. ;

D. CONSTRUCTION

Preparation of Cracks
All cracks shall be blown clean and sterilized by use of a propane air torch generating 2,000

degrees F and 3,000 feet/second velocity to eliminate all vegetation, dirt, moisture and seeds. All
debris removed from the cracks shall be removed from the pavement surface immediately by
means of a power sweeper, hand or air broom.

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Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

Preparation and Placement of Sealant

No crack sealant material shall be applied in wet cracks or where frost, snow or ice is present, or
when the ambient temperature is below 25 degrees F.

The asphalt-fiber compound shall be thoroughly mixed for a minimum of one hour before
application can begin. To ensure a uniform fiber distribution in the sealant, and also to limit
fluctuations in the application temperature of the blended material, the contractor must have a
full melter kettle of sealant mixed, heated to the proper application temperature, and ready for
testing at the start of each work day. Once that batch of sealant is emptied from the melter kettle,
crack sealing operations will cease for the remainder of the day. No new materials will be
allowed to be added to the melter kettle during the work day under any circumstances. Minimum
application temperature shall be 320 degrees F.

Sealant shall be delivered to the pavement cracks through a high pressure hose line and
applicator shoe. Diameter of the applicator shoe is not to exceed 3.5 inches. Once the pavement
cracks are sealed, the width of the sealant on the pavement (overbanding) shall be no greater than
3 inches. When traffic requires immediate use of the roadway, a boiler slag aggregate shall be
broadcast over the cracks to prevent the sealant from being picked up.

All workmanship shall be of the highest quality, and any excess of spilled sealant shall be
removed from the pavement by approved methods and discarded. Any workmanship determined
to be below the high standards of the particular craft involved will not be accepted, and will be
corrected and/or replaced as required by the Owner.

E. PERFORMANCE

Properly formulated and mixed asphalt fiber compound overbanding shall not be greater than
three inches (3”) in width. Penalties will be imposed upon the contractor for overbanding

beyond three inches (3”).

The contractor must submit the following with his bid proposal:
= The trade name of the crack sealant the bidder intends to use.
=" The manufacturer of the crack sealant the bidder intends to use.

The Engineer will require the contractor to successfully perform a 200 foot test strip in the field
prior to commencing work under the contract.

Manufacturer’s certificate of material compliance will be furnished to the Engineer certifying
conformance to the above material specifications, including the following:

" Performance Grade of Modified Asphalt: PG 64-28E (able to withstand
“extremely heavy” traffic loads)

« 7% chemically-modified crumb rubber (CMCR) composed of 100% 80-mesh
recycled tire rubber

« 3-4% specially formulated polymer package

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Technical Specifications iIFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

* AASHTO M-320, Table 1

o “EB” Jnr 3.2 kPa @ 64°C: <0.5%

© R3200 (Average % Recovery) @ 3.200 kPa: >70%
= 8% polyester reinforcing fibers

Time is of the essence in the completion of this work in order to minimize disruption to the
traveling public, and to reduce the Owner’s cost for police details and inspections of the work in
progress. Accordingly, bidders shall submit with their bid the volumetric capacity (in gallons) of
the melter kettle proposed to perform the work, together with a statement regarding their average
anticipated daily production rate or range of gallons per day of material expected to be applied.
The Owner reserves the right to consider its costs for traffic control and inspections in addition to
contractor’s bid prices to determine the proposal with lowest overall costs.

F. MEASUREMENT AND PAYMENT

Crack Sealing with Polymer & Crumb Rubber Modified Asphalt Compound with Reinforcing
Fibers (Crack Sealing) will be paid by the gallon (Gal) of crack sealing complete in place.
Payment for Crack Sealing includes full compensation for material, labor, transportation, and
equipment necessary to complete this portion of the Bid Schedule. No payment shall be made for
materials delivered on site but not placed.

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Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

ITEM 604.4 - REPAIR OF EXISTING STRUCTURES
A. SCOPE

This work consists of repairing existing structures below 12” from the bottom of existing casting
frame.

B. MATERIALS AND CONSTRUCTION

The contractor shall include all labor, materials, equipment, and transportation necessary to
repair existing structures other than within the top 12 inches below the bottom of casting frame.
Repairs in that section shall not be paid under this item.

The Contractor shall prevent any materials entering drain and sewer structures from this
operation and shall clean out said structures if material enters them as directed by the Engineer.

Mortar shall comply with NHDOT Section 707. Brick shall comply with NHDOT 604.2.4 and be
AASHTO M91 Grade SS brick. Contractor shall provide the City with material slips certifying
brick meets requirements.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a thick ring of mortar extending to
the outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction.

C. MEASUREMENT AND PAYMENT

Payment for repairing existing structures shall be at the contract unit price specified per vertical
foot and shall include full compensation for materials, labor, equipment, and transportation
required to complete this portion of the Bid Schedule.

Contractor shall record the vertical feet of repair completed for each structure, and the total
vertical feet of repair for each street. Payment is contingent upon submittal of quantities in a per
structure, and per street format.

Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

ITEM 604.45 - ADJUSTING TO GRADE EXISTING CASTINGS

A. SCOPE

This work consists of adjusting castings to the new final overlay elevation as shown on the
drawings or as directed by the Engineer. Any repair needed to the existing structure within the 12
inches below the bottom of casting shall be included and performed under this item. Any further
repair needed to the existing structure shall be performed and paid under item 604.4 Repair of
Existing Structures.

B. MATERIALS AND CONSTRUCTION

This work shall include all labor, materials, equipment and transportation necessary to adjust the
existing castings to the new street or new ground surface elevation.

Mortar shall comply with NHDOT Section 707. Brick shall comply with NHDOT 604.2.4 and be
AASHTO M91 Grade SS brick. Contractor shall provide the City with material slips certifying
brick meets requirements.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a thick ring of mortar extending to
the outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for

Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction.

C. MEASUREMENT AND PAYMENT

Payment for adjusting existing castings shall be at the contract unit price specified for each. All
castings regardless of size will be paid for as one (1) each.

Contractor shall record the number and location of castings adjusted for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.

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2.04 LEACHING CATCH BASINS

A. Leaching catch basins shall conform to the requirements for Products, Paragraph 2.1 herein.

B. _ Thestructure perforations shall be as detailed in the Contract Drawings.

C. Stone for backfill around the leaching catch basin shall conform to NHDOT Item 304.5, Crushed
Stone, Course. materials shall be top grade (100% solids, vulcanized) butyl rubber and shall meet
or exceed AASHTO M-198.

2.05 SEWER MANHOLE ACCESSORIES:

A. — Gasket materials shall be top grade (100% solids, vulcanized) butyl rubber and shall meet or
exceed AASHTO M-198.

B. Couplings at the manhole-pipe interface shall be made with a rubber seal system (with or without
stainless steel straps) meeting the requirements of ASTM C923 and recommended for this type of
connection.

C. Stubs installed as specified and indicated on the drawings shall be short pieces of the same class
pipe as that entering the manhole and shall have erther stoppers or end caps as shown on the
drawings. Stoppers or end caps shall be especially designed for that application.

2.06 CATCH BASIN ACCESSORIES:

A. — Anoil and debris trap shall be furnished and installed on outlet pipes in all catch basins. The trap
shall be The Eliminator® as manufactured by Groundwater Rescue, or approved equal.

2.07 PRECASTHEADWALLS

A. Precast headwalls shall conform to the details on the plans. Shea Concrete Products or equal.

PART 3 - EXECUTION

3.01 INSTALLATION:

A. PRECAST SECTIONS:

1. Precast bases shall be supported on a compacted level foundation of crushed stone, as
specified in Section 02300 EARTHWORK, at least 6-inches thick, but shall vary to the
depth necessary to reach sound undisturbed earth.

2022 Sewer Replacement Project Precast Manholes and Catch Basins
Nashua, NH 02631-5

Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

ITEM 604.46 - REPLACE CASTING

A. SCOPE

This work consists of replacing triangular, small diameter, and broken manhole frames and
covers, and catch basin frames and grates as shown on the drawings or as directed by the
Engineer. Any repair needed to the existing structure within the 12 inches below the bottom of
the casting shall be included and performed under this item. Any further repair needed to the
existing structure shall be performed under Item 604.4.

B. MATERIALS AND CONSTRUCTION

This item shall include all labor, materials (except for frames and covers), equipment, and
transportation necessary to replace castings, and to set them at new overlay elevation. Frames,
covers, and grates will be provided by the City of Nashua at 9 Stadium Drive in Nashua. This
item is to include removal of existing frame and cover, transport to City of Nashua drop off site
(Four Hills Landfill at 830 West Hollis St in Nashua), transport new frames and covers from 9
Stadium Dr in Nashua to work area, placement and all excavation and pavement restoration
work,

Mortar shall comply with NHDOT Section 707. Brick shall comply with NHDOT 604.2.4 and be
AASHTO M91 Grade SS brick. Contractor shall provide the City with material slips certifying
brick meets requirements.

Mortar shall be tooled into every vertical joint between bricks prior to installing a new horizontal
brick layer. Mortar between brick layers shall be 3/8” thick and fully cover all bricks in the layer.
Use of the weight of castings and additional brick layers to facilitate joint filling and further
spreading of mortar is not permitted. All brickwork shall be sealed on the outside and inside of
the structure with mortar. The casting frames shall be set in a thick ring of mortar extending to
the outer edge of the masonry. Mortar shall be placed on top of the bottom flange and smoothly
finished to have a slight slope that will shed water away from the frame.

All mortar shall be mixed with a cement mixer as approved by the Engineer. Mixing mortar by
hand/shovel will not be permitted.

Unless otherwise noted herein, this work shall conform to the latest approved City of Nashua
Standard Specifications for Road Construction, City of Nashua Standard Specifications for
Sewers and Drains, and the latest approved NHDOT Standard Specifications for Road and
Bridge Construction.

C. MEASUREMENT AND PAYMENT

Payment for replacing existing castings shall be at the contract unit price specified for each. All
castings regardless of size will be paid for as one (1) each. The removed castings will remain the
property of the City of Nashua.

Technical Specifications IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1

Contractor shall record the number and locations of castings replaced for each street. Payment is
contingent upon submittal of quantities in a per structure, and per street format.

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