SS 2027 PW1 IFB Specifications - Final.pdf

Invitation for Bids (IFB)

SS 2027 PW1

For

Public Works Services and Materials

Specifications

Metropolitan Area Planning Council (MAPC)

On behalf of the South Shore Regional Services Consortium

Representing the following municipalities:

Braintree, Cohasset, Duxbury, Hanover, Hingham, Hull, Marshfield, Milton, Norwell, Pembroke, Rockland, and Scituate

Table of Contents General Specifications

Item 4 Roadway Surface Sealing Treatments

Item 4 Roadway Surface Sealing Treatments

Item 6 Pavement Markings

Item 8 Street Sweeping

Item 14 Sidewalks

General Specifications Unless otherwise noted in these specifications, all materials and work under any resulting contract or contracts shall be in conformance with the latest Editions of:

• MassDOT Standard Specifications for Highways and Bridges, Supplemental Specifications, and Standard

Special Provisions

• MassDOT Construction and Traffic Standard Details

• U.S. Department of Transportation Manual on Uniform Traffic Control Devices (MUTCD)

• MassDOT Wheel Chair Ramp Standard

• The American Water Works Association’s Standard for the Installation of Ductile-Iron Water Mains and

Their Appurtenances

• MassDOT Standard Drawings for Signs and Support

Item 4 Roadway Surface Sealing Treatments

A. MICRO-SURFACING

Scope of Work

This specification is for the micro-surfacing of various roads in the participating Member municipalities. It includes the rut filling, surface course, leveling and surface course, and crack sealing of the road that encompasses the micro-surfacing of the road. All micro-surfacing shall conform to these specifications.

General Information

Micro-Surfacing is a tough and durable thin overlay material which can restore the original service properties to worn but structurally sound pavements. Its properties are based on a blend of select crushed aggregate and a sophisticated chemical formulation of asphalt cement, cationic emulsifiers, adhesives, and latex. This specification covers all materials, equipment, construction and application procedures for rut filling and/or surfacing of existing paved surfaces. The micro-surfacing shall be a mixture of cationic latex modified asphalt emulsion, mineral aggregate, mineral and field control additives, and water, properly proportioned, mixed and spread on the paved surface in accordance with this specification and as directed by the Engineer.

Materials

Emulsified Asphalt

The emulsified asphalt shall be a quick-set latex modified cationic type CSS-lH emulsion and shall conform to the requirements specified in ASHTO M208 and ASTM 2397. It shall pass all applicable storage and settlement tests. The latex shall be milled into the emulsion. The cement mixing test shall be waived for this emulsion.

Special Residue Properties

Distillation of residue will be at a temperature of 350 degrees F. for twenty (20) minutes. Softening point of the residue shall be l40 degrees F. minimum. Viscosity, absolute at l40 F. shall be 8,000 poise minimum.

Aggregate

The mineral aggregate used shall be of the type and grade specified for micro-surfacing. The aggregate shall be manufactured crushed stone such as granite, slag, limestone, chat, or other high quality aggregate or combination thereof.

Aggregate Physical Requirements

Grading: The aggregate including natural fines when tested by AASHTO methods TII or T27, or ASTM

Cll7 or Cl36, should meet the referenced gradation requirements.

Deleterious Substances

To limit the permissible amount of clay like fines in an aggregate, a sand equivalent value of sixty-five

(65) or higher is required when tested by ASTM 24l9.

Soundness

The aggregate shall have a weighted loss of not more than fifteen percent (l5%) when the sodium sulfate test is used or twenty percent (20%) when the magnesium sulfate test is used.

Hardness:

The aggregate wear, from resistance to abrasion, shall be a maximum of thirty-five percent (35%) when using AASHTO T96 or ASTM Cl3l test methods.

Water

The water shall be potable and shall be free of harmful soluble salts.

Modifier

Special quick-setting emulsifier agents shall be milled into the asphalt emulsion. The emulsified asphalt shall be so formulated that when the paving mixture is applied at thickness of one (l) inch with the relative humidity at not more than fifty percent (50%) and the ambient air temperature of at least seventy-five (75) degrees F. the material will cure sufficiently so that rolling traffic can be allowed in one (l) hour with no damage to the surface, as verified by the Town.

Additives

A mineral additive shall be introduced to the mineral aggregate and may be any recognized brand of non-air-entrained Portland cement of hydrated lime that is free of lumps, or other approved mineral additive. It may be accepted upon visual inspection. The amount of mineral additive needed shall be determined by the laboratory mix design and will be considered as part of the material gradation requirement. A liquid field control additive is introduced and blended with water to provide effective control of the required quick-set properties. This additive shall be made available by the chemical supplier or emulsion manufacturer and certifiable as being compatible with the mixture.

Engineering

Before work commences, the Contractor shall submit a signed mix design covering the specific material to be used on the project. This design shall be performed by a qualified laboratory. Once the materials are approved, no substitution will be permitted unless first tested and approved by the laboratory preparing the mix design.

Mix Design

The qualified laboratory shall develop the job mix design and present certified test results for the

Contractor's approval. Compatibility of the aggregate and Ralumac emulsion shall be verified by the mix design. The job mix formula shall provide a minimum Marshall stability of l,800 pounds and a flow of six (6) to sixteen (l6) units when tested according to the ASTM l559 or AASHTO 245 procedure as modified. All component materials used in the mix design shall be representative of the material proposed by the Contractor for use on the project.

The Engineer shall approve the design mix and all micro-surfacing materials and methods prior to use. The component materials shall be within the following limits:

Residual Asphalt 5% to 9% by dry weight of aggregate

Mineral Additive 0.5% to 3% by dry weight of aggregate

Latex Modifier As required to provide specified properties

Field Control As required to provide specified properties

Additive Water As required to produce consistency

Aggregate - Recommended Gradations:

Screen Size Type II % Passing Type III % Passing

3/8" l00 l00

#4 90 - l00 70 - 90

#8 65 - 90 45 - 65

#l6 40 - 65 30 - 50

#30 25 - 45 19 - 34

#50 l5 - 30 l2 - 25

#l00 l0 - 2l 7 - l8

@200 5 - l3 4 - l2

Suggested Application & Rate:

Type II - Urban and Residential

Sts.

l8-22 lbs. per sq. yd

Type III - Primary and Interstate

Routes

25-30 lbs. per sq. yd.

Wheel Ruts Application rates as required

Equipment

All equipment, tools, and machines used in the performance of this work shall be maintained in satisfactory working condition at all times to ensure a high quality product.

Mixing Equipment

The material shall be mixed by a self-propelled micro-surfacing mixing machine which shall be a continuous flow mixing unit able to accurately deliver and proportion the aggregate, emulsified asphalt, mineral and field control additives, and water to a revolving multi-blade twin shafted mixer and discharge the mixed product on a continuous flow basis. The machine shall have sufficient storage capacity for aggregate, emulsified asphalt, mineral and field control additives, and water to maintain an adequate supply to the proportioning controls. The machine may be equipped with self-loading devices which provide for the loading of materials while continuing to lay micro-surfacing, thereby minimizing construction joints.

Proportioning Devices

Individual volume or weight controls for proportioning each material to be added to the mix, i.e., aggregate, emulsified asphalt, mineral and field control additives, and water shall be provided and properly marked. These proportioning devices are usually revolution counters or similar devices and are used in material calibration and determining the materials output at any time.

Emulsion Pump

The emulsion pump shall be a heated positive displacement type.

Spreading Equipment

The surfacing mixture shall be spread uniformly by means of a mechanical type spreader box attached to the mixer, equipped with paddles to agitate and spread the materials throughout the box. A front seal shall be provided to insure no loss of the mixture at the road contact point. The rear seal shall act as final strike off and shall be adjustable. The mixture shall be spread to fill cracks and minor surface irregularities and leave a uniform skid resistant application of material on the surface. The spreader box and rear strike off shall be so designed and operated that a uniform consistency is achieved to produce a free flow of materials to the rear strike off. The longitudinal joint where two passes join shall be neat appearing, uniform and lapped. All excess materials shall be removed from the job site prior to opening the road. The spreader box shall have suitable means provided to side shift the box to compensate for variations in pavement width and longitudinal alignment. A Rut Box shall be available to pre-fill wheel ruts when necessary prior to overlay to eliminate puddles or runoff interruption. The box shall be readily adjustable from 4' -6' width with hydraulically adjusted strike off screeds to attain maximum grade and profile.

Auxiliary Equipment

Suitable surface cleaning equipment, traffic control equipment, hand tools and any support equipment shall be provided as necessary to perform the work.

Machine Calibration

Each mixing unit to be used in performance of the work shall be calibrated in the presence of the

Engineer prior to construction, or previous calibration documentation covering the exact materials to be used may be acceptable provided they were made during that calendar year. The documentation shall include the individual calibration of each materials at various settings, which can be related to the machine metering devices.

Weather Limitations

The material shall be spread only when the road surface and atmospheric temperatures are at least forty-five (45) degrees F. and rising and the weather is not rainy and there is no forecast of temperatures below thirty-two (32) degrees F. within forty-eight (48) hours from the time of placement of the mixture.

Notification and Traffic Control

Notification

All homeowners and businesses affected by the construction shall be notified one (l) day in advance of the surfacing. This notification shall be in the form of a written posting stating the times and dates that construction is expected on their road.

Traffic Control/Safety Signage

a. Only traffic controls/safety signage specifically requested by the Town and erected on site will be paid for under this item.

b. Traffic controls/safety signage used by the contractor for his own convenience, such as those placed out and removed on a daily basis, will be considered incidental to the work and shall not be included for payment under this item.

Surface Preparation

The area to be surfaced shall be thoroughly cleaned of vegetation, loose aggregate and soil, particularly soil that is bound to the surface. Manholes, valve boxes and other service entrances will be protected from the surfacing material.

Cracks in Surface

It is required that the successful bidder, in the application of a leveling course and surface course, must pretreat the cracks in the surface with a fiber crack sealer prior to the application of the micro-surfacing. The crack sealer must comply with the attached specifications. The crack sealer is not required when applying a surface course only or in the alternate bid.

Tack Coat

If required by the plans, the Contractor shall apply a tack coat consisting of one part emulsified asphalt and three parts water with a distributor at .l0 - .l5 gallons per square yard. This emulsified asphalt should be the CSSlH emulsion grade. It is recommended that a tack coat always be applied to a concrete or brick surface.

Stockpiles

Precautions shall be taken to insure that stockpiles do no become contaminated. The mineral aggregate shall be screened prior to being weighed for job site delivery. This weight shall be done by means of a scale approved by the Engineer.

Application

The surface should be pre-wetted by fogging ahead of the spreader box when required by local conditions. The rate of application of the fog spray shall be adjusted during the day to suit temperatures, surface texture, humidity, and dryness of the pavement surface.

The micro-surfacing mixture shall be of the desired consistency upon leaving the mixer and no additional materials should be added. A sufficient amount of material shall be carried in all parts of the spreader at all times so that a complete coverage is obtained. Overloading of the spreader shall be avoided. No lumping, balling, or unmixed aggregate shall be permitted.

No streaks, such as those caused by oversized aggregate, will be left in the finished surface. If excessive oversize develops, the job will be stopped until the Contractor proves to the Engineer that the situation has been corrected.

Joints

No excessive buildup, uncovered areas or unsightly appearances shall be permitted on longitudinal or transverse joints. The Contractor shall provide suitable width spreading equipment to produce a minimum number of longitudinal joints throughout the project. When possible, longitudinal joints shall be placed on lane lines. Half passes and odd widths passes will be used only in minimum amounts. If half passes are used, they shall not be the last pass of any paved area.

Mix Stability

The micro-surfacing mixture shall possess sufficient stability so that premature breaking of the material in the spreader box does not occur. The mixture shall be homogeneous during and following mixing and spreading. It shall be free of excess water or emulsion and free of segregation of the emulsion and aggregate fines from the coarser aggregate.

Areas which cannot be reached with the mixing machine shall be surfaced using hand squeegees to provide complete and uniform coverage. The area to be hand-worked shall be lightly dampened prior to mix placement. Care shall be exercised to leave no unsightly appearance from handwork.

The same type finish as applied by the spreader box shall be required. Handwork shall be completed at the time of the machine applying process.

Lines

Care shall be taken to insure straight lines along curbs and shoulders. No runoff on these areas will be permitted. Lines at intersections will be kept straight to provide a good appearance.

Rolling

If required by the plans, specified areas shall be rolled by a self-propelled ten (l0) ton pneumatic roller with a tire pressure of fifty (50) PSI and equipped with a water spray system.

Quality Control

Materials

The Contractor will permit the Engineer to take samples of the aggregate and asphalt emulsion to be used in the project at the Engineer's discretion. Gradation and sand equivalent tests may be run on the aggregate and residual asphalt content test on the emulsion. Test results will be compared to specifications. Tests will be run by a qualified laboratory at the expense of the buyer. The buyer must notify the contractor immediately if any test fails to meet the specifications.

Micro-Surfacing Mixture

Samples of the mixture should be taken daily and may be taken directly from the mixing unit(s).

Consistency and residual asphalt content tests may be made on the samples and compared to the specifications. Test will be run by a qualified laboratory at the expense of the buyer. The buyer must notify the Contractor immediately if any test fails to meet specifications.

The Engineer may use the recorders and measuring facilities of the unit to determine application rates, asphalt emulsion content, mineral and field control additives, and water.

Non-Compliance

If any two (2) successive tests fail on the stockpile material, the job shall be stopped. It is the responsibility of the Contractor at his own expense, to prove to the Engineer that the conditions have been corrected. If any two (2) successive tests on the mix from the same machine fail, the use of the machine shall be suspended. It will be the responsibility of the Contractor, at his own expense, to prove to the Engineer that the problems have been corrected and that the machine is working properly.

Performance

It is the intention of this Public Agency not to award a contract for Micro-Surfacing work under this or any other proposal if the bidder cannot furnish satisfactory evidence that he has the ability and experience to perform this class of work and that he has sufficient capital and equipment to enable him to prosecute the work successfully and to complete it within the time named in the contract.

Performance Warranty

The Contractor must furnish the following warranty after completion of the work and prior to final payment.

The Contractor hereby warrants that all workmanship and all materials furnished under the Contract comply fully with requirements of these Micro-Surfacing Specifications. If at any time within two (2) years after the date of the final inspection, any unfaithful or defective work should appear, which in the opinion of the Buyer is due to inferior materials or workmanship, the Contractor warrants to do whatever is necessary to remedy the defects immediately without cost to the Buyer. The Buyer will notify the Contractor in writing of the defects and the repairs to be made, and the Contractor will begin repairs within a mutually agreed time frame.

Measurement and Payment

The quantity to be measured for payment will be the number of square yards of Micro-Surfacing actually completed. The accepted quantity of Micro-Surfacing will be paid for at the contract unit price per square yard of the type specified in the proposal, which shall be full compensation for furnishing, transporting, handling and placing the materials specified and furnishing of all labor, tools, equipment and incidentals for the satisfactory completion of this item. Rut filling will be paid by the ton of mixed material in place.

B. EMULSION WITH LATEX STONE/SAND SEAL

The work performed under this specification shall include all necessary labor, material and equipment to place stone seal surface treatment with emulsion and latex. It is requested that this process be bid with three options:

1. Double application using 1/2 inch and 3/8 inch diameter stone in two lifts;

2. 3/8 inch stone and 1/4 inch grit in two lifts; and

3. Single application of either 3/8 or 1/2 inch diameter stone.

Contractors shall not sublet, sell, transfer, assign or otherwise dispose of the contract or any portion thereof, or of his right, title, or interest therein, without written consent of the Awarding Authority. In case such consent is given, Contractors will be permitted to sublet a portion thereof, but shall perform with his own organization and equipment, work amounting to not less than 50 percent of the total contract cost.

Supervision

Contractors shall designate a "Job Superintendent" at the award of any one or various projects for the Participating Member Municipality. This Job Superintendent shall have the authority and decision making capabilities for Contractors. This Job Superintendent shall be present at all projects during the prosecution of work. In writing, Contractors shall inform the Participating Member Municipalities who is the Job Superintendent. Any change in supervision shall be in writing and have prior approval by the Participating Member Municipalities or his designated Agent. If this requirement is not abided to and the Participating Member Municipalities provided advance written notice, the Participating

Member Municipalities, at his option, may back charge Contractors $500. per day until the Job

Superintendent is back on the job.

Patch Work

Areas to be patched will vary in size and location throughout the Participating Member Municipality as determined by the Participating Member Municipality. Liquid and stone application may be applied by either truck or hand application at the discretion of the DPW Director.

Emulsified Asphalt and Latex Double Stone Seal Specifications

Materials

Emulsion: Anionic R.S.-2 or Cationic C.R.S.-2L conforming to A.S.T.M. D977-80 or

D2397-79respectively.

Latex: Latex rubber additive.

Stone Chip: (2 sizes) 1/4" to 3/8" Treated 1/2" to 5/8" Treated

Crushed stone shall consist of durable crushed rock consisting of the angular fragments obtained by breaking and crushing solid or shattered natural rock, and free from a detrimental quantity of thin, flat or other objectionable pieces.

3/8" Crushed Stone - % by Weight Passing Through

Gradation: 1/2" 100%

3/8" 65-90%

#4 0-8%

#8 0-4%

#16 0-2%

1/2" Crushed Stone - % by Weight Passing Through

Gradation: 5/8" 100%

1/2" 85-100%

3/8" 15-45%

#4 0-15%

#8 0-5%

Stone Treatment: Stone shall be treated in mix plant or pugmill at a rate of 2 to 30 gallons per ton using a cutback asphalt MC-30, MC-70 or asphalt emulsion CSS-1H or SS-1H. Sufficient stone shall be treated and stockpiled on location for the entire project. The emulsion manufacturer may amend or substitute the above specifications after testing of the stone for compatibility with the emulsion.

All substitutions, amendments or deletions must be made in writing to Contractors for inspection by the Awarding Authority.

Quantities of Materials – Per Square Yard

Shall be within the maximum and minimum quantities as shown in the bid Item. The exact quantities of materials, both liquid asphalt and stone, may be varied as directed to meet specific field conditions without adjustments to contract unit prices.

The equipment used by Contractors shall include, but not be limited to, one or more of the following:

Aggregate Spreading Equipment: Self-propelled that can be adjusted to control and spread accurately the given amounts of cover aggregate per square yard. It shall be mounted on pneumatic tires and with a width of spread not less than 10 feet. Cut-off plates shall be provided to permit the width of spread to be reduced in increments of 6 inches or 1 foot from the maximum width of 12 feet to 6 inches. The unit shall be capable of spreading aggregate of maximum 1 1/2 inch size at any rate desired from 3 to 60 pounds per square yard of surface covered without contact of the wheels of the spreader with the treated surface until the aggregate has been spread. A hopper of a minimum capacity of 5 tons, integral with the spreader unit, shall be provided to receive the aggregate from transporting vehicles, without the wheels of such vehicles coming in contact with the uncovered bitumen of the road surface. Two (2) conveyer belts shall supply aggregate from the hopper to the element which spreads the aggregate on the road's surface. Power shall be provided to propel the spreader at a uniform rate of movement of gradients up to 6 percent.

Self-Propelled Rubber-Coated Vibratory Drum Roller: Suitable for rolling bituminous pavements and shall have a total compacting width of not less than 66 inches. The gross weight shall be adjustable within the ranges of 166 to 333 pounds per linear inch of compacting width. The operating weight shall be as directed.

Distribution: Shall contain suitable mechanical circulating and heating appliances that will provide a uniform approved temperature of the entire mass of the material. It shall be capable of applying bituminous material in accurately measured quantities at any rate from 1/10 to 2 gallons per square yard of surface with any length of spray bar ordered to a maximum of 20 feet, and maintaining a uniform rate of distribution for the entire load regardless of change in gradient or direction of the road. The design and size of spray nozzles and construction of the pressure system shall provide a sufficient and uniform fan-shaped spray throughout the entire length of the movable spray bar at all times while operating, which spray will be uniform and completely cover the portion of surface receiving the application. Each distributor shall be equipped with the following: a tachometer - front and rear, a thermometer, a measuring stick graduated in gallons, a strainer in the discharge line to prevent clogging, attached hand gun and hose, and a pouring pot.

Front-End Loader: Minimum 3.25 cubic yard rubber tired front-end loader to load stone on trucks at stockpile.

Trucks: Trucks in sufficient number to supply the chipspeader at all times.

Equipment and Personnel: All equipment to be used shall be in excellent condition to ensure a continuous operation and sufficient qualified personnel to operate the equipment.

Construction Method

Contractors and a representative of the Awarding Authority shall measure all public ways identifying the location, dimensions, square yards of work area involved and the cost for the same.

Application of Emulsion: The pre-determined quantity of liquid shall be sprayed uniformly onto the prepared surface.

Application of Aggregate: A uniform application of the pre-determined quantity of aggregate shall immediately be spread over the emulsified asphalt binder.

Rolling: Rolling shall be done with a self-propelled rubber-coated vibratory drum roller following the application of the cover aggregate. The roller shall be operated at a speed that will not displace the aggregate.

Traffic Control/Safety Signage: The Contractor, at the Town’s option, will provide all safety signing for construction operations per MassDOT Standard Specifications, Section 850, Traffic Controls for

Construction and Maintenance Operations (Pay Item 852).

Quality Control and Inspection

Inspection: Close supervision and inspection by qualified personnel shall be maintained to ensure that rates of application and amount of rolling are being adhered to.

Aggregate: It is important to ensure clean aggregate and to avoid excessively wet aggregate.

Temperature of Emulsion: Temperature of asphalt emulsion at the time of application shall be not less than 130 degrees Fahrenheit, nor more than 180 degrees Fahrenheit.

Weather: The minimum temperature shall be 45 degrees Fahrenheit and rising, with no rain predicted.

Latex Rubber Additive: It is preferred that the latex be added at the refinery or terminal since mixing is faster and it allows more time for the latex to blend with the asphalt before application. It can be added to the distributor at the job site in the following manner - with the recirculating pump running, add the latex slowly and continue to recirculate for 20 minutes before application. Unless otherwise specified, the latex addition should be at the rate of 2.5 gallons per 100 gallons of emulsion.

Sweeping: Excess aggregate should be removed as soon as possible by means of a power sweeper, but it is recommended not to remove it sooner than 3 days following the completion of the stone seal application. Removal of excess aggregate (greater than 34 pounds per square yard) shall be the responsibility of Contractors. Removal aggregate, which applied in accordance with the specification, shall be removed by Participating Member Municipality forces.

Basis for Payment

Payment for each bid item, except handwork, shall be made at the contract unit price per square yard times the measured number of square yards contained in each designated public way.

Handwork shall be paid by means of hourly rate for labor and equipment on the job (not including travel), plus the payment of a unit item per square yard for materials. The prices per square yard shall be full compensation for furnishing all materials, equipment, tools, traffic details and incidentals necessary to complete the surface treatment as herein described. In case there is a discrepancy in figures and words on Bid Form, the words shall supersede.

Item 4 Roadway Surface Sealing Treatments

C. 10% & 20% ASPHALT RUBBER SURFACE TREATMENT

APPLIED TO HOT-MIX ASPHALT ROADWAYS

Description

This work shall consist of consist of the Contractor furnishing and applying hot, rubberized asphalt and immediately embedding aggregate therein by spreading and rolling, in accordance with these specifications on properly prepared Hot-Mix Asphalt Roadways. This is also commonly referred to as

Stress Absorbing Membrane (SAM) or a Stress Absorbing Membrane Interlayer (SAMI).

Bid quantities are approximate only; payment shall be for actual quantities applied to streets. Streets to be treated shall be selected by the Contractor and the Director or his/her Designee.

Materials

• Asphalt Cement

Asphalt cement for the asphalt-rubber mixture shall be PG 58-28 OR PG 64-28, complying with the requirements of appropriate state or local specifications. The grade selected shall be based on laboratory testing by the asphalt-rubber supplier.

• Anti-stripping Agent

If required by the job-mix formula to produce appropriate water resistance, an anti-stripping agent that is heat stable and approved for use by the Town shall be incorporated into the asphalt-rubber material at the dosage required by the job-mix formula (up to 1.0% by weight of asphalt). It shall be added to the asphalt cement prior to blending with the granulated rubber.

• Rubber

The granulated rubber shall be vulcanized rubber product from the ambient temperature processing of scrap, pneumatic tires. The granulated rubber shall meet the following gradations: No substitutions will be accepted.

Sieve Size % Passing

2.00 mm, (#10) 100

1.18 mm, (#16) 90 – 100

0.60 mm, (#30) 25 – 75

0.18 mm, (#80) 0 - 20

The use of rubber of multiple types from multiple sources is acceptable provided that the overall blend of rubber meets the gradation requirements. The length of the individual rubber particles shall not exceed 3 mm, (1/8”). The rubber shall be accepted by certification from the rubber supplier.

• Aggregate

The aggregate shall conform to the requirement of appropriate state or local specifications for crushed stone. Crushed gravel stone will not be permitted. Percentage of wear as determined by the Los

Angeles Abrasion Test (AASHTO-T96) shall be a maximum of 30. The aggregate shall be preheated to a temperature between 93°C and 149°C, (200°F and 300°F), and be pre-coated with 0.4% to 0.8% (by weight of aggregate) of AC-10 or AC-20 asphalt cement prior to application. It is recommended that the gradation of the aggregate meet the following limits:

Sieve Size

% Passing – Nominal Size

9.5 mm, (3/8”)

12.5 mm, (1/2”)

15.8 mm, (5/8”) 100% 100%

12.5 mm, (1/2”) 100% 85 – 100%

9.5 mm, (3/8”) 85 – 100% 15 – 45%

4.75 mm, (#4) 0 – 25% 0 – 15%

2.36 mm, (#8) 0 – 5% 0 – 5%

0.30 mm, (#50) 0 – 2% 0 – 2%

0.075 mm, (#200) 0 – 2% 0 – 2%

• Materials Testing

A minimum of 60 days prior to construction the Town or contractor (if asphalt-rubber supplier is acting as a sub-contractor) shall send a representative sample of the asphalt cement and the aggregate proposed for use to the asphalt-rubber supplier for testing. Testing for stripping and asphalt content to determine and assure that appropriate characteristics are achieved when blended with the granulated rubber will be performed.

Asphalt-Rubber Mixing and Reaction

• Mixing and Reaction o 10% Asphalt Rubber Surface Treatment

The percent of rubber shall be 10% +/- 2% as indicated by the mixture design for specific project requirements by weight of total mixture, that is, by total weight of asphalt cement, plus granulated rubber. The exact granulated rubber content shall be determined by the mix design submitted by the supplier and based on laboratory testing.

The temperature of the asphalt shall be between 154°C and 204°C, (310°F and 400°F), at the time of addition of the granulated reclaimed rubber. The asphalt and rubber shall be combined and mixed together in a blender unit and reacted in the distributor for a period of time as required by the mix design. The temperature of the asphalt RPM mixture shall be above 163°C, (325°F), during the reaction period.

o 20% Asphalt Rubber Surface Treatment

The percent of rubber shall be 20 +/- 3% as indicated by the mixture design for specific project requirements by weight of total mixture, that is, by total weight of asphalt cement, plus granulated rubber. The exact granulated rubber content shall be determined by the mix design submitted by the asphalt-rubber supplier based on laboratory testing.

The temperature of the asphalt shall be between 177°C and 218°C, (350°F and 425°F), at the time of addition of the granulated reclaimed rubber. The asphalt and rubber shall be combined and mixed together in a blender unit and reacted in the distributor for a period of time as required by the mix design. The temperature of the asphalt-rubber mixture shall be above 163°C (325°F), during the reaction period.

• Delays

When a job delay occurs after full reaction, the asphalt-rubber may be allowed to cool. The asphaltrubber shall be reheated slowly just prior to application, but not to a temperature exceeding

191°C (375°F). An additional quantity of granulated rubber or additive not exceeding 3% by volume of the hot asphalt-rubber mixture may be added after reheating.

• Viscosity

Viscosities shall be run, by the asphalt-rubber supplier, on each blended load of asphalt-rubber using a

Haake-type field viscometer. The viscosity of the final product shall be in the range of 1,000 to 3,500 centipoise.

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

The equipment used by the Contractor shall include, but not be limited to, one or more of the following:

• Mechanical Blender

A mechanical blender for proper proportioning and thorough mixing of the asphalt-cement and granulated rubber is required. This unit shall be equipped with: an asphalt totaling meter (liters or gallons); a flow rate meter (liters per minute or gallons per minute); a positive displacement auger to feed the rubber properly to mixing chamber at the specified rate; and a static motionless mixer.

Blender will have a separate rate; and a static motionless mixer. Blender will have a separate asphalt cement feed pump and finished product pump to maximize production. Blender shall be capable of providing 100% proportional mix at any given time during the blending cycle and documentation from the manufacturer, supporting this, shall be submitted to the awarding authority if requested.

• Distributor Truck

On projects exceeding 31.8 metric tons, (35 tons), of liquid asphalt rubber, at least two pressuretype bituminous distributor trucks in good condition will be required. The distributor shall be equipped with an internal heating device capable of heating the material evenly up to 218°C, (425° F); an internal mixing unit capable of maintaining a proper mixture of asphalt cement and granulated rubber; have adequate pump capacity to maintain a high rate of circulation in the tank and to spray the asphalt-rubber at a viscosity of 1,000 to 3,500 centipoise; have adequate pressure devices and suitable manifolds to provide constant positive cut-off to prevent dripping from the nozzles.

Distributor shall be equipped with an electronically controlled computerized compensation unit for controlling application rates at various width and speed changes. The application unit shall have electronic controls and a digital read out installed and operated from the inside of the cab of the distributor. The distribution bar on the distributor shall be fully circulating. Any distributor that produces a streaked or irregular distribution of the material shall be promptly repaired or removed from the project.

Distributor equipment shall include a tachometer, pressure gauges, volume measuring devices, and a thermometer for reading temperature of tank contents. Controls for spray bar shall be located in cab of truck, for controlling width and rate of spray of product. It shall be so constructed that uniform applications may be made at the specified rate per square meter with a tolerance of plus or minus 0.2 liters per square meter, (0.05 gal. / sq. yd).

A “bootman” shall accompany the distributor and ride in a position so that all spray bar nozzles are in his full view and readily accessible for unplugging.

• Hauling Equipment

Trucks for hauling cover material shall be rear discharge conveyor-fed or “live bottom” trucks and shall be equipped with a device to lock onto the hitch at the rear of the chip spreader to prevent aggregate spillage.

Sufficient hauling vehicles will be available to ensure continuous operation of the distributor and chip spreader.

• Aggregate Spreader

The aggregate spreader shall be hydrostatically driven and self-propelled. It must be equipped with a hydraulically controlled variable adjustable head that is capable of spreading stone in widths from

1.4 to 5.4 meters, (4.5 to 18 feet). The spreader shall be mounted on pneumatic tires, and shall apply the stone on the road surface in a manner that ensures that the tires do not contact the road surface until after the stone has been applied. The unit shall be equipped with an electronic radar type sensor used to measure ground speed and will automatically adjust the stone application rate depending on width of application and the speed of chip spreader. It shall have the ability to apply stone on any grade from 0 - 6%. The spreader shall be equipped with an integral hopper with a minimum capacity of 4.5 metric tons, (5 tons), of stone which shall be filled by trucks in a manner which ensures that the truck tires never come in contact with asphalt treated road surfaces until the stone has been properly applied. To maintain constant stone application, a self-locking truck hitch will permit towing of aggregate trucks without stopping the chip spreader. It will be capable of maintaining positive engagement over irregular terrain.

• Pneumatic-Tired Roller

Two (2) self-propelled, multiple wheel, pneumatic-tired rollers shall be used and shall weigh between

6.5 and 10.9 metric tons, (7 and 12 tons), each roller shall have a total compacting width of at least

1.4 meters, (56 inches), have a minimum tire pressure of 414 kPa, (60 psi), and be equipped with a watering system.

• Steel-Wheel Roller

One (1) self-propelled, 2-axle (tandem) steel-wheel roller shall be used and shall weigh between 7.3 and 10.9 metric tons, (8 and 12 tons), and be equipped with scrapers, wetting pads and watering system. Combination pneumatic and steel drum-type rollers are acceptable, as one unit only.

• Sweepers

A rotary power broom or vacuum sweeper will be used to remove excess loose aggregate.

Weather Limitations

Work will not be done unless the road surface is dry. No work shall be done during rain or foggy periods. Asphalt-rubber shall not be applied when weather conditions are unfavorable to obtaining a uniform spread. Construction shall proceed only when the atmospheric temperature is at least 10 C

(50 F), and rising.

Preparation

Potholes, other areas of pavement failure, and major depressions in the existing pavement surface shall be repaired by the Town with asphalt concrete. A leveling course shall be place on planed, milled or existing surface by the owner, if required.

Prior to application of the asphalt-rubber, the surface shall be thoroughly cleaned by sweeping.

Contractor shall be responsible for covering all utility irons just prior to application and uncovering after aggregate is spread.

Application

• Spreading Rubber Asphalt

The asphalt-rubber mixture shall be applied at a temperature of 170° to 215°C, (338°F to 419°F), at a rate of 2.5 to 2.9 liters per square meter, (0.55 to 0.65 gallons per square yard). Exact rate to be determined by the aggregate gradation, traffic volume and pavement condition. Longitude joints shall be reasonably true to line and parallel to centerline. Where any construction joint occurs, the edges shall be broomed back and blended so there are no gaps and the elevations are the same, and free from ridges and depressions. Longitudinal joints shall be overlapped from 10.2 to 15.2 centimeters, (4 to 6 inches). During application, adequate provision shall be made to prevent marring and discoloration of adjacent pavements, structures, vehicles, foliage or personal property.

• Aggregate Application

The application of aggregate shall follow as close as possible behind the application of the hot asphalt-rubber which shall not be spread further in advance of the aggregate spread that can be immediately covered. Construction equipment or other vehicles shall not drive on the uncovered asphalt-rubber. The hot pre-coated aggregate shall be spread uniformly by a self-propelled spreader at a rate of spread directed by the Agency, generally between 16.3 to 21.7 kilograms per square meter, (30 to 40 pounds per square yard). Any deficient areas shall be covered with additional material.

• Rolling

A minimum of three (3) rollers shall be used for aggregate compaction into the hot asphalt-rubber. Two rollers must be pneumatic-tired and one must be steel-wheel. Rolling shall commence immediately following spread of aggregate. There shall be at least three coverage’s by the pneumatic-tired rollers to embed the aggregate particles firmly into the asphalt-rubber. A coverage shall be as many passes as are necessary to cover the entire width being spread with a pass being one movement of a roller in either direction. Additional coverage of the steel-wheel roller will follow. Water shall be applied to the tires or wheels as required to limit sticking of the asphalt-rubber and aggregate to the rollers.

• Sweeping

When the maximum amount of aggregate has been embedded into the asphalt-rubber and the pavement has cooled, all loose material shall be swept or otherwise removed. This will be done at a time and in a manner which, will not displace any embedded aggregate or damage the asphaltrubber.

All excess aggregate shall be removed by the Contractor but become the property of the Town. The

Contractor shall be instructed as to the location for stock-pile of the excess materials.

Measurement and Payment

Measurement for theses bid units shall be by the contract unit prices per square yard applied to the pavement. Payment shall be at the unit prices bid in the proposal and shall be complete payment for the entire item including furnishing, preparation and placing of materials, labor and equipment to be used on this project.

The square yards of treatment, determined as provided above, will be paid for at the ADJUSTED contract unit price per square yard for the item applied, complete in place. The Town shall not pay for material that has not been laid in place such as en route to and not used on the project, rejected material, and portions of truckloads that remain in the truck as excess material.

The Adjusted Contract unit price per square yard is determined monthly by applying both the calculated price adjustment factors to the original contract unit price per square yard. Due to the timing of the release of the MassDOT period pricing, invoices sent early in the month will not be processed until the MassDOT numbers are available. BCU = Bid Contract Unit price per square yard

ACU = Adjusted Contract Unit price per square yard

BPF = Base Price of Fuel on bid release date

PPF = Period Price of Fuel for the applicable calendar month

FF = Fuel Factor for HMA as determined by MassDOT (converted from TON to SY)

APF = Price per Square Yard adjustment for Fuel

BPLA = Base Price of Liquid Asphalt Cement on bid release date

PPLA = Period Price of Liquid Asphalt Cement for applicable calendar month

LA = Liquid Asphalt Cement in the HMA (converted from TON to SY)

APLA = Price per Square Yard adjustment for Liquid Asphalt Cement

1. Is a price adjustment to be made? Variance must be greater than 5%.

a. BPF – PPF greater than or equal to 5%

b. BPLA – PPLA greater than or equal to 5 %

2. Calculate the price per square yard adjustment for liquid asphalt cement:

c. APLA = (BPLA – PPLA)*LA

3. Calculate the price per square yard adjustment for fuel:

d. APF = (BPF – PPF)*FF

4. Calculate the Adjusted Contract Unit price per square yard:

e. ACU = BCU + APLA + APF

Item 6 Pavement Markings

This specification is for the painting of the Traffic, Parking and Safety markings on various streets and parking areas in the participating Consortium Member municipalities.

Unless stated otherwise in these specifications, all work and materials shall conform with MassDOT

Standard Specifications.

Traffic and safety markings in this contract shall include various amounts of double yellow lines, centerlines, edge lines, stop lines, crosswalks, directional arrows, text and pictograms, parking lines, traffic circles, and railroad crossings. The awarding company will have the responsibility of painting the markings according to the specifications of this contract. All markings shall follow either existing markings or line of reference, established by the Contractor after approval by the Town, without deviation. Any line deviation from the establishing control of incorrect width shall be reapplied.

Crews and Equipment

The Contractor shall furnish all materials, equipment, machinery, and labor (unless otherwise noted) necessary to apply, complete in place, painted and thermoplastic roadway traffic and other markings on road surfaces and parking areas at various locations.

All markings using text and pictograms must be performed or must use a template.

The Contractor shall possess a self-propelled paint lining machine for side streets and truck mounted equipment of approved manufacture capable of applying multiple lines in two colors and possess sufficient traffic cones to properly protect the applied lines. The pavement marking equipment shall be operated at the speed and in accordance with other requirements of the manufacturer.

Truck mounted equipment is approved for the application of pavement markings except in such cases where in the Town’s judgment travel will be unreasonably delayed and/or the quality of the work performed by the machine is unsatisfactory.

The Contractor must possess suitable equipment to properly apply Thermoplastic.

The Contractor shall perform the work with at least two (2) crews operating simultaneously. Each crew shall be equipped with sprayers capable of applying a single pass 12-inch line so as to expedite the application of

“STOP” and Crosswalk lines.

The Contractor shall furnish material used in the work. The paint shall conform to the specifications of the

Commonwealth of Massachusetts, Department of Public Works, Fast Dry White and Fast Dry Yellow.

The Contractor shall remove all waste containers and excess materials from the Town streets and facilities, whether stored or spilled, and shall remove by grinding or other means not chemically harmful to road surfaces any significant over-spray, spillage or misplaced lines before a payment is made for any work performed.

Materials

All symbols, templates, pictograms and text shall be applied in conformance with the most current USDOT

Manual of Uniform Traffic Control Devices unless otherwise directed by the Member municipality.

Method Payment

Payments shall be based on price per unit as delineated in the Bid Price Forms. Invoices must list streets and street segments where markings have been applied and must specify the types of markings applied.

THERMOPLASTIC

1. White thermoplastic reflectorized pavement marking shall conform to the specification M7.01.03 White

Thermoplastic Reflectorized Pavement Marking of the most current MASS HIGHWAY standard.

2. Yellow thermoplastic reflectorized pavement marking will conform to the specification M7.01.04 yellow

Thermoplastic Reflectorized Pavement Marking of the most current MAS HIGHWAY standard.

3. Preformed permanent plastic pavement markings or legends shall conform to specification M7.01.18.

WATER-BASE PAINT

1. White traffic paint shall conform to specification M7.01.10 Fast Drying White Traffic Paint of the most current MASS HIGHWAY standard.

2. Yellow traffic paint shall conform to specification M7.01.11 Fast Drying Yellow Traffic Paint of the most current MASS HIGHWAY standard.

3. Glass beads shall conform to specification M7.01.07 Glass Beads of the most current MASS HIGHWAY standard.

EPOXY RESIN

Description

1. This specification covers reflectorized white and yellow, two-component, hot-spray applied epoxy resin pavement marking material to be used for pavement marking on asphaltic and Portland cement concrete pavement surfaces. Upon curing, it produces an adherent reflectorized stripe of specified thickness and width capable of resisting wear from traffic. All work shall be performed according to Specifications, the

Special Provisions, the Contract Documents, and to the satisfaction of the Town.

Materials

1. Epoxy -Rein: The two-component, 100% solids, paint shall be formulated and designed to provide a simple volumetric mixing ration (e.g. 2 part component A to 1 part component B) specifically for service as a hot-spray applied binder for glass beads in such a manner as to produce maximum adhesion, refraction, and reflection. The material shall be composed of epoxy resins and pigments only and meet the following requirements:

2. Color: White-the color (after drying at the specified thickness) shall be a flat white, free from tint, furnishing good opacity and visibility under both daylight and artificial light, and shall match Chip No.

17875 of Federal Standard 595. Yellow-the color (after drying at the specified thickness) shall match

Chip No. 13538 of Federal Standard 595.

3. The paint shall be well mixed in the manufacturing process and shall be free from defects and imperfections that may adversely affect the serviceability of the finished product. The paint shall not liver, thicken, curdle, gel, settle excessively, or otherwise display any objectionable properties after storage.