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Suggested Polymer Modified, Fiber Reinforced Overband Crack Sealant Specifications

XXX.010 General
XXX.020 Materials

XXX.021 LIquid SBR Polymer

XXX.022 Polyester Fibers

XXX.023 Asphalt Cement

XXX.030 Equipment

XXX.031 Compressed Air System

XXX.032 Melter Applicator

XXX.033 Application Wand

XXX.034 Heat Lance

XXX.040 Manufacture

XXX.050 Construction

XXX.051 Crack Preparation

XXX.052 Application

XXX.053 Weather Limitations

XXX.054 Protecting the Work

XXX.060 Required Project Documentation

XXX.070 Acceptance of Work

XXX.080 Measurement and Payment.

XXX.01 General. Clean cracks in hot mix asphalt (HMA) pavements and place the specified materials into and over the crack. Place temporary pavement markings where overband crack sealant obliterates the existing pavement markings.

For this specification, the Owner's Department of Engineering shall be known as the Department.

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XXX.020 Materials. The overband crack sealant shall be composed of a mixture of liquid SBR polymer, polyester fibers and asphalt cement blended by weight in the following quantities:
Liquid SBR Polymer
Polyester Fibers
Asphalt Cement

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XXX.021 Liquid SBR Polymer. The liquid SBR polymer shall be a virgin unvulcanized styrene butadiene synthetic rubber polymer meeting the following requirements:
Typical Properties 
Ash, % of Total Polymer Solids, ASTM D 2973.0 Max
Volatile Content, 5 hrs@105°C,%5.0 Max
Coagulum on 80 mesh screen,%0.2 Max
Mooney Viscosity of Polymer, M/L 4@100°C95 Min
Brookfield Viscosity @ 25°C,cps80,000 Max
Flash Point, °C, Pensky-Martin method, ASTM D 93150 Min

The manufacturer of the liquid SBR polymer shall certify compliance with this specification.

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XXX.022 Polyester Fibers. The polyester fibers shall meet the following requirements:
Crimps, ASTM D 3937None
Tensile strength, Mpa, ASTMD 2256480 min
Denier, ASTM D 1577*6.0
Specific gravity1.32 - 1.40
Melting temperature, °C245 min
Ignition temperature °C540 min

*These data must be obtained prior to cutting the fibers.

The manufacturer of the polyester fibers shall certify compliance with this specification.

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XXX.023 Asphalt Cement. The asphalt cement shall be a standard paving grade asphalt AC-10, PG 58-28 or PG 64-22 and shall have a penetration value of 85-100.

The manufacturer of the asphalt cement shall certify compliance with this specification.

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XXX.030 Equipment. The Contractor shall use the equipment specified herein to mix and install the overband crack sealant. 

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XXX.031 Compressed Air System. Furnish and use a compressed air system that produces a continuous, high volume, high pressure stream of clean, dry air to prepare cracks. Equip the air compressor with a moisture separator to remove all oil and water from the air supply. Provide a compressor that can produce a minimum of 100 psi and continuous 150 cfm air flow.

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XXX.032 Melter Applicator. Provide a melter applicator consisting of a boiler kettle equipped with a pressure pump, hose and applicator wand. Equip the hose with a shutoff control. Place a mechanical full-sweep agitator in the kettle to provide continuous blending. Equip the unit with thermometers to monitor the material temperature and the heating oil temperature. Provide thermostatic controls that allow the operator to regulate material temperature up to 360 F.

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XXX.033 Application Wand. Apply the material by either a wand followed by a "V" or "U" shaped squeegee or a round applicator head having a concave underside.

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XXX.034 Heat Lance. Use of a heat lance to assure that no residual moisture is present in the crack or on the pavement surface is allowed.

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XXX.04 Manufacture. The overband crack sealant shall be blended in the specified melter applicator. The temperature of the material shall be maintained between 320-360 °F. Weigh tickets for the asphalt cement shall be used in determining the specified weight of the liquid SBR polymer and the polyester fibers to be blended into the asphalt cement. Fill the tar kettle with the asphalt cement. It is essential that the asphalt cement is in the kettle prior to the addition of the liquid SBR polymer in order to produce a uniform blend and prevent clogging the lines with polymer not uniformly blended with the asphalt cement. Mix the asphalt cement in the kettle with the agitator while slowly adding the liquid SBR polymer. Continue mixing for approximately 10 minutes or until a uniform blend has been obtained. The polyester fibers shall then be added and mixed until a uniform blend has been obtained.

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XXX.050 Construction. A pre-construction meeting shall be held with the Department prior to beginning the work to discuss the following:

1. The Contractor's detailed work schedule.
2. The traffic control plan.
3. Required project documentation.
4. Inspection of the condition and adequacy of equipment.

The Contractor shall designate an Authorized Contractor's Representative at the pre-construction meeting.

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XXX.051 Crack Preparation. Clean cracks using compressed air and other tools necessary to remove all loose dirt, vegetation and foreign material. Clean cracks no more than 10 minutes ahead of the sealing operation. Use of a heat lance is allowed to assure that no residual moisture is present in the crack or on the pavement surface where the overband crack sealant is to be applied. Do not attempt to seal soaked pavement cracks by drying the pavement surface with a heat lance.

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XXX.052 Application. Apply the overband crack sealant using the specified application wand to dry and thoroughly clean cracks. The overband crack sealant shall be 4 inches wide and 1/8 to 3/16 inch thick. Upon prior written approval of the Department, application width may be increased to a maximum of 6 inches to provide complete and uniform coverage over multi-crack areas. When no other surface treatment will be applied to the pavement, fill all visible cracks in the pavement. When preparing the pavement for a micro-surface overlay, fill all visible in the pavement. When preparing the pavement for a single or double chip seal, limit sealing to cracks more than 1/8 inch wide or 3 feet long. Seal cracks with varying widths, portions of which are 1/8 inch or greater, along their entire length.

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XXX.053 Weather Limitations. Overband crack sealant shall be placed when the air temperature is between 45 F and 85 F. No overband crack sealant shall be placed unless the pavement is dry and the cracks are free of moisture.

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XXX.054 Protecting the Work. The Contractor must allow the overband crack sealant to cool sufficiently before opening to traffic. Blotting materials such as sand, aggregate, sawdust or paper is prohibited. Any damage by traffic to the treated pavement areas shall be repaired by the Contractor at no expense to the Department. If the existing pavement marking are obliterated as a result of the crack sealing work, temporary pavement markings shall be placed before the roadway is opened to traffic at the Contractor's expense.

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XXX.06 Required Project Documentation. On a daily basis the Contractor shall provide a report to the Department with the following information:
1. Control section, job number and route number
2. Date, air temperature (°F), AM and PM weather
3. Beginning and ending locations for the day, including lane(s) and direction
4. Quantity of materials used for the day, including lot number
5. Traffic control typically used, number of traffic control modes and checks on the traffic control conducted
6. Unique or different situations on the project
Documentation provided by the Contractor shall contain the signature of the Contractor or the Contractor's Authorized Representative.

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XXX.07 Acceptance of Work. When the work is complete on the project, or on a route or job included in the project, schedule an inspection of the work with the Department. The Department will note all deficiencies including areas exhibiting adhesion failure, cohesion failure, missed cracks or other factors that show the work is not acceptable. Areas requiring corrective work as identified by the Department will not be deemed acceptable. Notify the Department upon completion of required corrective work or upon completion of work on the route, job or project if corrective work is not required.

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XXX.08 Measurement and Payment.
Contract Item (Pay Item)
Overband Crack Seal, Roadbed
Overband Crack Seal, Ramp
Overband Crack Seal, Parking Area
Pay Unit
Roadbed Mile
Roadbed Mile
Parking Area

Overband crack seal includes preparing and sealing cracks; providing the required documentation and all corrective action and temporary traffic markings required. Overband Crack Seal, Roadbed will be measured along the roadway centerline and will include the traffic lanes, the paved shoulders and all auxiliary lanes. For a divided highway the roadbed will be measured separately in each direction. Overband Crack Seal, Ramp will be measured along the ramp centerline and will include the traffic lanes, the paved shoulders and all auxiliary lanes. Overband Crack Seal, Parking Area will be measured and payment made as a single unit for each parking area identified by location and area.

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IMPORTANT NOTICE TO THE ENGINEER. The foregoing is for engineers only for the purpose of assisting them in preparing job specifications. Suggested specifications are for use under what may be termed “average conditions”. No single standard specifications, however, will cover satisfactorily all variations in local conditions relevant to individual jobs. Before adopting suggested specifications, the owner's engineer should give particular consideration to any special problems and make such changes as are necessary. Nothing contained herein shall be construed as recommendations or inducements to practice any invention covered by patent without permission of the patent owner.

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