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In long-term durability studies lasting more than two years, there was no sign of deterioration in concrete with Scrap Tire Fiber or STF. In fact, these durability studies indicate that STF can enhance the long-term durability of concrete as a result of the crack control ability.
Recycled-rubber roads are not new; asphalt roads that incorporate rubber “crumbs” from shredded tires exist in the U.S., Germany, Spain, Brazil, and China. Although using crumb-rubber does hold definite advantages over conventional asphalt, research has shown polymer fibers from tires has the unique benefit of potentially improving the resilience of concrete and extending its lifespan.