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Products Spray Apply Applications: Stress Absorbing Membrane (SAM) – is a chip seal application normally associated with Asphalt-Rubber (A-R) or Polymer Modified Asphalt-Rubber (PMAR). These elastomeric binder materials both contain high percentages of recycled tire rubber, SBS Polymer and other modifiers as required by individual project specifications which result directly in improved physical and chemical properties along with a very high viscosity allowing for increased application rates (0.55 to 0.75 gallons per square yard). These improvements lead to resistance to aging which means a lower oxidation rate due to the presence of carbon black and various antioxidants which are present in recycled tire rubber, improved cohesive strength which means that the binder(s) can support greater loading when stretched allowing for improved deformation and crack resistance. Improved elasticity and resilience resulting in additional resistance to cracking and flushing (higher softening points) allowing the pavement surface to be more stable in hot weather and low temperature flexibility (lower fracture temperature) improving flexibility at low temperatures again for crack resistance in cold weather. All of these improvements result in undisputed life cycle cost benefits for the specifying agency on roads and streets that range from 25 to 45 on the Pavement Condition Index (PCI). Stress Absorbing Membrane Interlayer (SAMI) – is utilized with the same design criteria as the SAM application discussed above. The only difference is that the SAM is overlaid with a conventional hot mix. When an asphalt-rubber gap or open graded hot mix is utilized for the overlay the SAMI is then known as an asphalt-rubber two-layer system. Asphalt-Rubber (AR) or Polymer Modified Asphalt-Rubber (PMAR) Cape Seal – is utilized in the same manner as a SAMI except there is no hot mix overlay applied. The wearing surface, applied over the SAM, is usually a Type II Slurry Seal applied in residential areas or a Micro Surface which is applied on collector or major arterial streets. Rubberized Asphalt Binder (RAB) Chip Seal – is utilized in the same manner as a SAM application but the application rate is usually specified at a lower rate (0.30 to 0.50 gallons per square yard) depending on the pavement condition which is usually in a higher range (40 to 60 on the PCI) compared to the A-R or PMAR binders (see above). The RAB chip seal is considered an equal alternate as compared to the AC 15-5TR, AC 20-5TR and the various 140º F softening point terminal blend binder materials. Polymer Modified Binder (PMB) Chip Seal – can be utilized in the same manner as the RAB, normally at the same application rate with a range of 50 to 70 on the PCI. This binder type normally contains an SBS radial polymer or combination of SBS radial and linear polymer as the modifier component to achieve individual project specification requirements. No tire rubber is used in this type of binder which could potentially reduce the life cycle performance/cost benefit. Conventional Emulsion and Polymer Modified Emulsion (PME) Chip Seal – is very different from the binder materials mentioned above as these are emulsified rather that hot applied PG (Performance Graded) asphalt cement based materials. The emulsion binder materials are considered more of a conventional method of chip sealing and are utilized by many agencies that literally have to maintain large amounts of square yardage per year, at the lowest unit price possible. This type of chip seal construction is usually associated with pavements that are much higher on the PCI, usually in a range from 65 to 85 and if utilized on pavements in worse condition usually do not have good life cycle performance.
ISS - Manufacture and Supply of Asphalt-Rubber
for Hot Mix and Paving:
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