B08_-_Attachment_1_-_Statement_of_Work_-_Friction_Seal_FY25_.pdf

Yellowstone National Park

Friction Seal Requirements 2025

Statement of work:

Yellowstone National Park will be requiring a contractor to apply a friction seal surface treatment to roads within Yellowstone park totaling 36,000 square yards of treatment.

Friction Seal is defined as an emulsified Gilsonite-asphalt surface treatment which includes the simultaneous application of a suitable fine-aggregate to maintain adequate surface friction, meeting the specifications described in the specification section.

Scope:

This work shall consist of furnishing all labor, material, and equipment necessary to perform all operations for the application of a Friction Seal to asphaltic concrete surface courses. The installation shall be by spray application of the Friction Seal emulsion, and the simultaneous application of fine aggregate. All work shall be in accordance with the specifications and subject to the terms and conditions of this contract.

This process shall consist of the application of an emulsified asphalt surface treatment composed of an emulsion of natural and refined asphalt materials, a polymer additive, and the simultaneous application (both oil and aggregate being applied by same truck) of a suitable fine-aggregate to maintain adequate surface friction. The emulsified asphalt surface treatment shall be applied in accordance with these specifications.

Period of Performance:

The operation will take place between July 1st and August 31st, 2025.

Application Site:

• Grant Village, Yellowstone National Park

Material Specifications:

Aggregate. The aggregate material shall be manufactured from 100% fractured face parent rock. It shall be a dry, clean, dust and dirt free, sound, highly textured, durable, angular-shaped, specialty fine-aggregate with physical characteristics as outlined in the following table(s). Where applicable, testing is performed using the required gradation of ‘host rock’ to meet specific test requirements. Prior to the start of construction, the Contractor shall submit to the Contract Officer or their representative for required approval, the manufacturer’s technical data and manufacturer’s certification indicating that the specialty fine-aggregate meets the requirements of the specification prior to start of construction.

The fine-aggregate shall meet the following gradation parameters:

Aggregate Material Gradation Requirements (ASTM C136)

Sieve Percent Passing No. 6 No. 8

No. 14 No. 50

98-100 60-80 0.5-5

Typical Fine-Aggregate Characteristics

Test Standard Range Magnesium Sulfate Soundness ASTM C88 – Fine Aggregate <5% loss LA Abrasion ASTM C131 – Grading D <20% loss Fine Aggregate Angularity ASTM C1252 – Testing Method A 40% - 55% Moisture Content (%) ASTM C566 <1.0% Mohs Hardness Mohs Scale Min. 7.0 AIMS Texture AIMS Medium Range 85% - 100%

The Contractor shall provide a manufacturer’s Certification showing analysis and properties of the material delivered for use on the project. The Contractor’s provided certification may be subject to verification by sampling and testing the material delivered for use on the project.

Asphalt material. The Contractor shall furnish the Manufacturer’s certified test reports for the emulsified asphalt, in its concentrated (neat) form, to the Contract Officer or their representative, showing that the material meets the following properties:

Concentrated (Neat) Asphalt Emulsion Properties

Properties Specification Limits

Saybolt Furol Viscosity at 77°F (25°C)

ASTM D244 20 – 100 seconds

Residue by Distillation or Evaporation

ASTM D244 56% minimum

Sieve Test ASTM D244 0.1% maximum 24-hour Stability ASTM D244 1% maximum

5-day Settlement Test ASTM D244 5.0% maximum

Particle Charge 1 ASTM D244 Positive

5.5 maximum pH

15 pH may be used in lieu of the particle charge test which is sometimes inconclusive in slow setting, asphalt emulsions.

Polymer-modified Emulsion Residue by Distillation or Evaporation Tests

Properties Specification Limits

Solubility in 1, 1, 1 trichloroethylene

ASTM D2042 97.5% minimum

Asphaltenes ASTM D2007 15% minimum Saturates ASTM D2007 15% maximum

Polar Compounds ASTM D2007 25% minimum

Aromatics ASTM D2007 15% minimum

Viscosity at 60°C AASHTO T-315 5000 cts maximum

Softening Point °C AASHTO T-53 60 minimum

Penetration AASHTO T-49 15 – 50

Elastic Recovery 25 °C AASHTO T-301 25% - 75%

Ductility 25 °C AASHTO T-51 5% - 50%

The asphalt material base residue shall contain not less than 20% gilsonite, or uintaite. The material shall be compatible with asphaltic concrete and have a 3-year minimum proven performance record on pavements. Curing time, under recommended application conditions, shall not exceed four (4) hours.

The Contractor shall furnish vendor’s certified test reports showing that the material is the type, grade and quality specified for each load of asphalt material delivered to the project. The certification shall also show the shipment number, refinery, consignee, destination, contract number and date of shipment. The test reports and certification shall be delivered to the Contract Officer or their representative before approval is granted to use the material. The furnishing of the vendor’s certified test report for the asphalt material shall not be interpreted as a basis for final acceptance. The manufacturer’s material test report certification may be subject to verification by testing the material delivered for use on the project.

The asphalt material storage and handling temperature shall be between 70°F - 160°F and the material shall be protected from freezing, or whenever outside temperature drops below 40°F (4°C) for prolonged time periods.

Polymer. The manufacturer of the asphalt emulsion surface treatment shall certify that the emulsion contains a minimum five (5) percent polymer, by volume of the asphalt emulsion. The manufacturer shall also certify that the polymer possesses the appropriate characteristics to perform well in the surface treatment system. If the polymer shall be added to the emulsion mix at the manufacturer’s plant, then the manufacturer’s Certificate of Compliance/Analysis ticket(s) shall be delivered to the owner/agency or their representative by the Contractor. If the Polymer is added to the asphalt distributor truck at the jobsite, the addition shall be done under the observance of a qualified manufacturer’s representative or by a manufacturer’s trained Contractor.

Polymer-modified residue properties after aging:

Residue Properties after PAV aging (ASTM 6521) PG Grade, Celsius (M320): 82-16 or 76-22 Colloidal Index: minimum 2.5

Material Performance:

The Friction Seal shall have a record of at least three (3) years of satisfactory service as an asphalt Surface Treatment. Satisfactory service shall be based on the capability of the material to penetrate and bond with the clean pavement surface becoming a part of the surface of the treated pavement, show no signs of cracking or peeling, be impervious to water, and have a history of safe long-term friction characteristics.

The bidder must submit with his bid: an example of the manufacturer's certification that the material proposed for use is compliant with the specification requirements; previous-use documentation and test data conclusively demonstrating that the Friction Seal has been used successfully for a period of three (3) years.

Applicator Experience:

The Friction Seal shall be applied by an experienced pavement surface treatment applicator. The bidder shall have a minimum of three years’ experience in applying Friction Seal, or other high-performance pavement preservation systems.

Subject Matter expert (SME):

Contractor shall provide a SME to be onsite for the duration of the project to provide support and troubleshooting of any issues with the application process. The SME shall have a minimum of 5 years of experience with the Friction Seal Process.

Applicating Equipment:

Liquid and aggregate combination distributor truck.

The distributor for spreading the emulsion and the aggregate shall be self-propelled, with the aggregate being applied within less than 3 feet of the emulsion and shall spread the fine aggregate via a computer rate-controlled aggregate distribution apparatus that is integral to the distributor truck and is designed specifically for fine-aggregate distribution. The distributor shall be designed and equipped to distribute the Friction Seal uniformly on variable widths of surface at readily determined and controlled rates from

0.18 to 0.28 gallons of liquid per square yard of surface, and 2 to 6 pounds of fine aggregate per SY of surface. Distributor equipment for liquid shall include computer rate-control, full circulation spray bars, pump rpm gauge, volume measuring device, integral heater (thermostatically controlled), and a hand hose attachment suitable for application of the emulsion manually to cover areas inaccessible to the distributor truck. The distributor shall be equipped to circulate the emulsion within the tank.

The combination distributor truck will apply emulsion and fine-aggregate to the emulsion on the pavement in a single pass operation without driving through wet emulsion. The aggregate spreader shall be equipped with a variable control system and proper fine-aggregate apparatus capable of uniformly distributing the fine-aggregate at the specified rate at varying application widths and speeds. The fine-aggregate spreader shall have a minimum hopper capacity of at least 20,000 pounds (9,000 kg) of the specified fine-aggregate.

When directed by the Contract Officer or their representative: a verification of distributor equipment as well as application rate accuracy and uniformity of distribution shall be made; any equipment that is not maintained in full working order, or is proven inadequate to obtain the results prescribed, shall be repaired or replaced.

Preparation of asphalt pavement surfaces:

This process will be conducted By NPS personnel.

Traffic Control:

NPS will be responsible for executing the traffic control plan and provide the personnel for this operation.

Method of Measurement:

Friction Seal will be measured by the square yard as provided for in the Contract Documents.

Basis for Payment:

Friction Seal shall be paid for PER SQUARE YARD, which shall be full compensation for furnishing all materials, equipment, labor and incidentals to complete the work as specified and required.

Bid Items:

Mobilization to Yellowstone National park $__________________

Cost per Square Yard, to include application truck, all materials and Labor: $___________________