Specifications include, but are not limited to: a. Liquid Asphalt: Liquid asphalt grades shall be: CRS-2 or RS-2 conforming to AASHTO specifications M208 or M140. The liquid asphalt shall be compatible with the aggregate to be utilized for the chip seal interlayer course. b. Fiber-Reinforced Micro-Surfacing Residue Properties For fiber-reinforced mixtures, emulsion testing by distillation method (ASTM D5 or AASHTO T49) shall yield Penetration values of between 40 and 120 dmm at 77 degrees F, and a Softening Point (ASTM D36 or AASHTO T53) not less than 135 degrees F. c. Stone: Stone shall be crushed quarry stone, free from dust, soft stone or other contaminants with a minimum of 70% of the stones having a fractured face. All stone shall satisfy a 35% maximum for the L.A. Abrasion Test and a 35% maximum for the Flakiness Index Test. Stone shall be treated prior to application with liquid asphalt material at the rate of 0.2% to 0.5% residual asphalt to ensure uniform treatment of all stones. Proper pre-treatment shall be obtained by a twin-shafted pugmill with a digital readout belt scale. REQUIRED STONE GRADATION 9.5 mm (3/8”) STONE SIEVE SIZE % PASSING 12.5 mm (1/2”) 100 9.5 mm (3.8”) 85 – 100 6.3 mm (1/4”) 10 – 60 4.75 mm (#4) 0 – 25 2.36 mm (#8) 0 – 5
