Asphalt-Rubber 

CARRIES HEAVIER TRAFFIC VOLUMES AND HEAVIER LOADS THAN CONVENTIONAL SURFACE TREATMENTS

HOW IT WORKS

When the blend of asphalt cement and reclaimed tire rubber is reacted at temperatures exceeding 350° F, the rubber particles swell giving the resulting material a higher viscosity and producing an asphalt cement with improved high and low temperature properties. The rubber gives the blend increased elasticity and flexibility. The anti-oxidants and carbon black in the rubber significantly increase the longevity of the new binder. The high viscosity and elevated cohesiveness of the product increase film thickness. This combination of materials decreases aging as well as increases the strength of the binder.

PROCEDURES

Stress Absorbing Membranes, (SAM), consist of a blend of 20% +/- 3% crumb rubber based on the total weight of the Asphalt-Rubber binder. The Asphalt-Rubber is spray-applied on an existing pavement at the rate of .5 to .7 gallons per square yard. The liquid membrane is then covered with 3/8" or 1/2" stone at the rate of 30 to 35 pounds per square yard. SAMs can be used on roads with heavy and fast traffic where conventional chip seals are not adequate for the conditions. SAMs provide double the pavement life of a conventional chip seal by reducing oxidation of the surface, binding the existing surface together, reducing spalling around existing reflective cracks, and by decreasing the amount of surface water intrusion into the base.

A Stress Absorbing Membrane Interlayer, (SAMI), occurs when a layer of asphalt hot mix is placed on top of a SAM. The purpose of a SAMI is to extend the serviceable life of an overlay. This is achieved by retarding the rate of reflective crack formation. The use of a SAMI also waterproofs and retards the age hardening of the underlying asphalt pavement.

COST ADVANTAGES

SAMs and SAMIs are used when pavements are in need of rehabilitation due to extensive cracking and also require improvements of ride-ability and/or structure. This unique system results in minimum loss of curb reveal, does not require expensive adjustments of road structures, and also reduces the time required for costly traffic control.

ASPHALT-RUBBER HOT MIX (Gap-Graded)
Asphalt-Rubber, when used as a binder with a gap-graded aggregate, has been proven to be a superior, cost effective overlay. Because of Asphalt-Rubber's thick film characteristics and anti-oxidant properties, engineers are able to reduce lift thickness while maintaining pavement life.

ALL STATES can work with municipal, state, or consulting engineers on a job-by-job basis to construct a need-specific Asphalt-Rubber hot mix.

Call the ALL STATES professionals for more information about how ASPHALT-RUBBER applications can help you.