Tires are difficult to recycle since they are composed of different materials such as rubber, carbon black, steel, and polymers. A patented tire-recycling process developed by a local company separates rubber and steel from used tires and yields two textile fiber by-products. The aim of this study was to characterize the fibers and to evaluate their effect on the shrinkage cracking potential of concrete. Commercial microfibers were also included in the tests for comparison. A dosage of 0.1% F1 fibers reduced cracking by 87%, while 1% F2 fibers achieved up to a 97% reduction in cracking under severe environmental conditions, while a dosage of 0.1% by weight of commercial fibers achieved full cracking control. Large cracks (above 3 mm) and medium cracks (surrounding 2 mm) were fully controlled using the recycled fibers. It was concluded that these byproducts have excellent performance in mitigating restrained shrinkage cracking of cement composite materials. This has beneficial implications on the durability of concrete. Additionally, this recycling alternative could contribute to closing the material loop of tires.
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