Asphalt Rubber is a blend of asphalt, ground tire rubber (crumb rubber) and other additives that have been reacted together with heat so that the rubber particles swell. The resulting rubber modified binder is then mixed with aggregate and laid down to form a very durable road surface.
Benefits of AR Over Other Asphalt Modifiers:
Extends Life of Road Surface
· AR road surfaces last up to twice as long as standard asphalt
The crumb rubber used in the asphalt rubber mix offers unique properties that extend highway surface life. It increases elasticity, retards the aging process, increases both tensile strength and wear resistance, and withstands a wide variety of temperature extremes.
These properties greatly reduce rutting and cracking that typically occurs in road surfaces.
Clockwise from top left: 1) Close up of asphalt rubber pavement,
2) Paver putting down asphalt rubber, 3) 8-year-old asphalt rubber
pavement, and 4) 8-year-old standard asphalt pavement.
· Thinner overlays can be used, in many cases as low as half the thickness a conventional pavements.
Because of the dramatically improved strength and performance of asphalt rubber, it can be applied as an overlay at a reduced thickness, generally about half as thick as conventional asphalt. In a world striving for sustainability and conservation of natural resources, the reduced thickness of asphalt rubber can save on the amount of stone aggregate and oil required to resurface a road.
· Reduction in maintenance costs
Because of the reduction in paving thickness required and the reduced road maintenance and repairs, asphalt rubber can save as much as $50,000 per lane mile, over the lifetime of the roadway.
Resists Cracking and Rutting
The chemical composition of crumb rubber naturally retards the aging and oxidation of asphalt rubber pavement, as designed to do in a tire. This, along with the physical elasticity of the rubber, creates a road surface between 25 and 50 times stronger and is much less brittle than conventional asphalt. The use of AR results in a great reduction in cracking and rutting and the inevitable pot-holes that are produced when cracks allow water to penetrate and act on the subsurface.
Reduces Road Noise
· 50% quieter than conventional asphalt and 85% quieter than grooved concrete!
Traffic noise studies have been conducted on all types of pavement surfaces. Asphalt Rubber has been proven to reduce the decibel level substantially -- as much as 85% when compared to concrete. A significant factor in traffic noise is the "grooves" cut in concrete to add traction and the joints and seams between concrete slabs. Tires make less noise on Asphalt Rubber because "grooves" are not necessary for traction. The noise reduction is often substantial enough to eliminate the need for other noise abatement measures.
· Reduces hydroplaning
· Shortens stopping distances
· Reduces road spray which improves visibility.
All these attributes reduce vehicle accidents and highway fatalities.
· Uses scrap tires (aprox. 300 million scrap tires generated in the USA and Canada annually)
· Reduces usage of paving aggregate, bitumen and crude petroleum
Other Entech Crumb Rubber Product Markets
Sports Field Infill & Track Surfaces
Molding & Extrusion