Description
The United States Air Force (USAF) is seeking information from potential contractors for the purchase of a specific type of pelletized asphalt to support the USAF Airfield Damage Repair (ADR) Program. The objective of the ADR program is to develop capabilities to rapidly repair damaged airfield pavements. The material must meet specific general specifications, including being a mixture of aggregate and pelletized asphalt mixed together, having asphalt pellets well dispersed in the total aggregate gradation, and conforming to certain standards.
• The product shall be a mixture of aggregate and pelletized asphalt mixed together.
• Asphalt pellets shall be well dispersed in the total aggregate gradation.
• Aggregate gradation, asphalt binder, and job mix formula shall conform to UFGS-32-12-15 (paragraphs 2.1, 2.2, and 2.3).
• Pelletized asphalt shall have a pellet form with a particle diameter greater than 0.15-in and less than 0.35-in.
• Pelletized asphalt shall be coated to be non-tacky.
• Pelletized asphalt shall consist of at least 88% by weight asphalt binder conforming to performance grade PG 76-22, as certified by the asphalt binder supplier.
• The final product, when properly mixed and heated to approximately 320°F, shall produce a quality airfield hot mix that meets an APA rutting depth of less than 4.5-mm as tested at 240-lb wheel load at 120-psi hose pressure.