نقش الياف تاير هاي ضايعاتي در ترك خوردگي آسفالت با استخوان بندي سنگدانه اي

This study aims to investigate the effect of waste tire fibers on the cracking resistance an‎d mechanical properties of Stone Mastic Asphalt (SMA). SMA, due to its coarse aggregate gradation an‎d rich bitumen content, is widely used in high-traffic pavements but is susceptible to thermal an‎d fatigue cracking at low temperatures. Waste tire fibers, as a reinforcing additive, were considered due to their high tensile strength, thermal stability, an‎d environmental benefits in reducing tire waste. In this research, SMA samples with 0% (control), 0.1%, 0.2%, an‎d 0.3% tire fiber content by weight of aggregates were prepared an‎d eva‎luated through Indirect Tensile Strength (ITS), Resilient Modulus (MR), an‎d Semi-Circular Bending (SCB) tests at temperatures of 0, -12, an‎d -24°C. The results showed that adding tire fibers increased ITS from 528 to 825 kg (56% improvement) an‎d SCB fracture energy from 3000 to 7445 N•mm, indicating a significant enhancement in energy absorption capacity before failure. The 0.2% fiber content provided the best balance between flexibility an‎d cracking resistance, particularly at 0°C, with a fracture energy of 7081.25 N•mm. The effect on resilient modulus was minimal (from 3480 to 3535 MPa, less than 2% increase), suggesting that fibers primarily enhance cracking resistance an‎d durability rather than short-term elastic behavior. These findings confirm the high potential of tire fibers in improving SMA durability, reducing cracking, an‎d managing waste. It is recommended to test the optimal 0.2% fiber content in real-world projects an‎d develop design guidelines. Further research is suggested to eva‎luate long-term performance, real-scale applications, an‎d combinations with other additives such as nanoparticles.

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