Spray Applied Penetrating Asphalt Rejuvenator

1. DESCRIPTION

This work shall consist of furnishing all materials, equipment, labor and preparation necessary for the application of a light coating of a penetrating asphalt rejuvenator to existing or newly constructed asphalt pavements for the primary purpose of slowing the oxidation, raveling and other damage caused to unprotected asphalt pavements.

2. MATERIALS

Both plant-based and petroleum-based asphalt rejuvenating products will be accepted for this bid if they meet the material requirements listed below:

Penetrating plant-based rejuvenators may be emulsified, factory-blended or placed in its original formulation as per manufacturer’s recommendations. Petroleum-based asphalt rejuvenating products shall be an emulsion composed of a petroleum resin oil base uniformly emulsified with water. Each bidder must submit with their bid a certified statement from the asphalt rejuvenator manufacturer evidencing that the asphalt rejuvenating agent conforms to the required physical and chemical properties required to achieve the Material Performance and Testing outlined below in Section 2a, Parts 1 and 2 below.

At no time is any dilution or altering of the rejuvenating agent permitted once it leaves the blending facility or manufacturer. Rejuvenating materials shall follow all manufacturer’s recommended storage controls with regards to temperature (never frozen or overheated), agitation and exposure to UV light. The manufacturer/contractor shall ensure that the products are free of defect and within the product’s useable shelf-life.

a) Material Performance and Testing:

1) The asphalt rejuvenating agent shall be capable of penetrating the asphalt pavement, absorbed into the asphalt, and become incorporated into the asphalt binder such that the viscosity and stiffness (rheological properties) of the asphalt binder is reduced by the amounts listed in Tables 1 and 2 below.

2) If the owner so chooses, the effectiveness of the asphalt rejuvenator shall be determined by testing the asphalt binder extracted from the top 3/8” of cores taken from the treated roadway 30-45 days after application of the rejuvenator and comparing those results to the properties of the asphalt binder extracted from the top 3/8” of cores taken from the roadway prior to treatment. Asphalt rejuvenation shall be considered successful when the properties of the recovered asphalt binder satisfy the requirements in Tables 1 and 2 below. The costs associated with coring/sampling, asphalt binder extraction, and asphalt binder testing shall be paid by the Owner.

Reference Tables 1 and 2 below.

2 Procedures: Sample collection for application and acceptance as noted in this specification. Sample weights and measure by ASTM D3549; Extraction by: ASTM D2172, Method A using toluene (conditioning to remove moisture will not be accomplished); Recovery by: ASTM D1856 (Abson) or ASTM D5404 (Roto-Vap); and binder extraction, recovery and testing within 48-96 hours of obtaining pavement cores or equivalent surface area samples.

3. EQUIPMENT

a) Pressure distributor: The emulsion shall be applied with a computer rate-controlled asphalt distributor. The equipment shall be in good working order and contain no contaminants or diluents in the tank. Spreader bar tips must be clean, free of burrs, and of a size to maintain an even distribution of the emulsion. Any type of tip or pressure source is suitable that will maintain predetermined flow rates and constant pressure during the application process with application speeds under eight (8) miles per hour or seven hundred (700’) feet per minute. Before use the equipment must be tested under pressure for leaks to ensure it is in good working order.

The distributor truck shall be equipped with a 12-foot minimum, spreader bar with individual nozzle control. The distributor truck shall be capable of specific application rates in the range of 0.05 to 0.25 gallons per square yard. These rates shall be computer-controlled rather than mechanical. The distributor truck shall have an easily accessible thermometer that constantly monitors the temperature of the emulsion and have an operable mechanical tank gauge that can be used to cross-check the computer accuracy.

A distributor truck shall be provided, if necessary, equipped to effectively heat and mix the material to the required temperature prior to application. Heating and mixing shall be done in accordance with the manufacturer’s recommendations. Care shall be taken not to overheat or over-mix the material.

The distributor shall be equipped to hand-spray the emulsion in areas identified either on the plans or by the Engineer, or not accessible to the distributor truck itself.

Spray Applied Penetrating Asphalt Rejuvenator Specification Version 2022.1

b) Calibration: Furnish all equipment, materials, and labor as necessary to calibrate the computer- controlled distributer. Perform the calibration with the specified material prior to applying the penetrating rejuvenator on the prepared surface, in accordance with applicable standards and the project specifications.

4. WEATHER LIMITATIONS

Place the rejuvenation product when both the pavement and atmospheric temperature is 50F and rising.

Do not place penetrating rejuvenator if any of the following conditions exist:

a) Impending weather conditions do not allow for proper curing, or if temperatures are forecasted below 32F within 24 hours from the time of work.

b) The existing pavement temperature is 140F or above.

c) The pavement surface is wet, or rain is forecasted within 24 hours of placement.

5. SURFACE PREPARATION

The Contractor shall clean the pavement surface prior to placement with a power broom or road sweeper. Clean any muddy or dirty areas by flushing with water. Allow surface to dry completely prior to applying penetrating rejuvenator.

Remove oil or grease that has not penetrated the asphalt pavement by scraping or by scrubbing with a detergent, then wash thoroughly with clean water.

6. APPLICATION OF PENETRATING ASPHALT REJUVENATOR

The Contractor shall follow the construction methods as described. Target application rates for the penetrating asphalt spray rejuvenator shall be in the range of 0.05 to 0.135 gallons per square yard as established by the Engineer after spraying a test strip or strips with varying application rates in order to determine the optimum rate to achieve coating without runoff or delayed curing times. Generally, the application rate for pavements 2 years old and less will be in the range 0.05 to 0.075 gallons per square yard, the application rate for pavements 3 to 5 years old will be in the range 0.08 to 0.10 gallons per square yard, and the application rate for pavements 6 years old and older will be 0.11 to 0.135 gallons per square yard.

The penetrating asphalt spray rejuvenator shall be applied at an initial rate determined by the manufacturer’s recommendation and the Engineer on site. A 200’ test strip will be required to ensure that the rate is at a sufficient amount for uniform coverage of the asphalt surface. Continuous monitoring of surface conditions or changes in asphalt mat characteristics requiring adjustment to the application rates to conform to conditions shall be determined by the manufacturer’s representative. If the target application rates are not the optimum application rates to achieve proper coating of the existing or newly constructed pavement surface, or if the break time is too long or too short, immediately notify the Engineer. Adjust and document the new application rate by stationing.

Do not allow the asphalt rejuvenating agent to streak on the road surface. If the Engineer determines that streaking is occurring, cease operations until the Engineer is satisfied that streaking has been eliminated.

Apply the penetrating asphalt spray rejuvenator treatment to all exposed areas of asphalt surface as directed by the Engineer.

7. TRAFFIC CONTROL

Unless otherwise specified in the contract documents, maintain one-way traffic on two lane highways in accordance with Standard Drawing and as directed by the Engineer. Maintain traffic on multi-lane highways as specified by the contract documents. Lower volume roadways may be closed at the discretion of the Engineer. Traffic control shall be considered incidental to the performance of this item except for police details and flagger costs. The cost of flaggers and any police details, if required, will be paid or reimbursed by the Owner. The Owner will coordinate detail assignments which will be billed to the Contractor directly based on the hourly cost. The Contractor will not be reimbursed for police detail expenses incurred due to failure to cancel or cancelling without the required notice.

8. METHOD OF AWARD

To ensure contractor accountability, the Owner intends to award all items to a single contractor. Accordingly, contractors must bid on all items of work, and the low bidder will be the contractor whose total bid price is the lowest. The bid quantities are not guaranteed, and their primary purpose is for the determination of the low bidder.

9. MEASUREMENT AND PAYMENT

a) The quantity to be measured for payment will be the number of square yards of penetrating rejuvenator completed at various application rates.

b) No additional compensation shall be made for additional work required to apply penetrating rejuvenator treatment to areas outside the normal operating width of the distributor.

10. FUTURE YEAR PRICE ADJUSTMENTS

The Owner reserves itself the option to extend the use, terms, conditions, and prices of this bid for an additional five (5) years after the first year in which the contract is awarded. Such extension will be subject to the Owner reviewing and approving the Contractor’s annual request for a price adjustment based on and limited to the prior year’s actual rate of inflation. If such price adjustment cannot be mutually agreed upon between the Owner and Contractor, Owner may choose to re-bid the work in lieu of extending the contract.

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