نقش الياف تاير‌هاي ضايعاتي در مقاومت تغيير‌‌ شكل آسفالت با استخوان بندي سنگدانه اي

The performance of asphalt pavements is constantly influenced by mechanical an‎d environmental factors, with distresses such as rutting, creep, an‎d fatigue cracking being the most critical threats to their long-term durability. In order to enhance structural integrity an‎d extend the service life of flexible pavements, the use of additives—particularly fibers—has gained considerable attention in recent years. Among different types of fibers, recycled tire fibers have emerged as a sustainable an‎d effective option due to their desirable mechanical strength, thermal stability, an‎d the potential benefits of recycling waste materials. These fibers can form a reinforcing network within the asphalt mastic, thereby improving cohesion, reducing binder drain-down, an‎d enhancing stress distribution at the aggregate–binder interface. Consequently, they play a significant role in reducing permanent deformations. In this study, Stone Matrix Asphalt (SMA) mixtures were prepared with four different fiber contents (0%, 0.1%, 0.2%, an‎d 0.3% by weight of aggregates). The samples were eva‎luated through a series of mechanical tests, including Marshall stability an‎d flow, creep, rutting, resilient modulus, an‎d indirect tensile strength (ITS). The experimental results revealed that while the influence of fibers on certain parameters such as Marshall stability an‎d resilient modulus was rather limited, the fibers had a significant effect on enhancing tensile strength, reducing rut depth, an‎d increasing the number of load cycles sustained before creep failure. Particularly, mixtures containing 0.2% tire fibers exhibited the most balanced performance, combining improved mechanical strength with adequate mixture homogeneity, an‎d thus were identified as the optimum dosage. Overall, the findings confirmed that incorporating recycled tire fibers not only improves the performance an‎d durability of SMA mixtures but also provides an environmentally sustainable an‎d economically viable approach to managing waste tire materials. These results can serve as a practical basis for engineering decisions in the design an‎d maintenance of heavily trafficked asphalt pavements.

5

153962