Asphalt Rubber

What is Hot Asphalt Rubber Sealing?
Pavements fail by several mechanisms. Go to technical library for a full discussion and email for a CD-Rom of power point presentations. When reconstruction is too expensive or not practical the use of an asphalt rubber SAM( Stress absorbing membrane) seal or SAMI ( stress absorbing membrane interlayer) should be considered. The latter may be used with slurry for a Cape Seal. By these means cracking can be alleviated. On new roads cracking can be avoided.

Asphalt rubber is a blend of crumb rubber and asphalt ( type I) and crumb rubber and natural rubber with asphalt ( type II). All the materials are derived from recycled rubber ( tire and other).

The binder is at least 15% modifier and is made with an on site blender. The elastomeric nature of the binder, its high viscosity and softening point improve the seal , reduce cracking and improve stone retention.

What is it used for?
Asphalt Rubber Chip Seals can be used over cracked pavements as long as the cracking is alligator or fine.

Are there different types?
Hot Rubber chip seals can vary in stone size, binder composition and application rates. They may be used as running surfaces or topped with hot mix or with slurry. They may be single layer or multiplayer. VSS will be pleased to advise. See also the Chip Seal information.

How are Asphalt Rubber Chip Seals constructed?
  1. The surface is patched and large cracks filled.
  2. The surface is swept
  3. The binder is applied via a computer controlled distributor, this is done hot at about 195C.
  4. Immediately after the spray aggregate is applied with a self propelled chip spreader. The aggregate is precoated with hot asphalt and is hot itself.
  5. The chips are rolled with a rubber tyred roller to embed and orientate the chips into a strong mat.
  6. A flush coat or fog seal is applied after sweeping of excess aggregate to hold the aggregate in place for its early life.

What does it do?
The rubber in the binder is resistant to cracking and blunts cracks as they propagate. This reduces reflective cracking, creates a flexible and tough material.

What does it cost?
A VSS estimator will be pleased to estimate your job. Asphalt Rubber Chip treatments are significantly less expensive than thick overlays or reconstruction.


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