Specifications include, but are not limited to: Liquid asphalt materials, asphalt binders, asphalt emulsions, petroleum resin-oil base emulsion, asphalt repair mastics and rubber/asphalt crack sealant must conform to the following requirements: 1. Crumb Rubber/Asphalt Crack Sealant will be composed of a homogenous blend of ground vulcanized rubber and asphalt cement or a blend of approximately 60% vulcanized rubber and 40% devulcanized rubber and asphalt cement. Fillers, plasticizers, and thermoplastic rubber may be added as necessary to meet specifications. a. The ground rubber must be free of fabric, wire, cord, and other foreign material. A maximum of 4% calcium carbonate may be included to prevent particles from sticking together. The asphalt cement prior to combining with the rubber must conform to AASHTO M226 Table 1 Type IV specifications. b. The Rubber/Asphalt Crack sealant must meet the following physical property requirements: (1) Recycled rubber, mass, % of asphaltic components, minimum…… 18 (2) Cone Penetration, 25°C (77°F), maximum....................................... 90 (3) Bond Test, 50% extension, @-18°C (0°F) ....................... Pass 5 cycles (4) Flow, 60°C (140°F), mm, maximum.................................................. 5 (5) Resilience, 25°C (77°F), minimum................................................... 40 (6) Softening Point, °C, minimum.......................................................... 82
