چكيده به لاتين
Abstract
Asphalt recycling Although it has a long history in the road construction industry, due to the challenges posed by the use of asphalt Reclaimed (RAP) in the production of recycled asphalt mixtures, despite the economic and environmental benefits, has not become widespread in the world. Extensive research on the use of asphalt reclaimed in the production of recycled asphalt is ongoing. According to studies, aging bitumen contained in RAP materials is the main barrier to using this material in the construction of a new pavement. In fact, the addition of asphalt reclaimed containing high-stifness bitumen (aging) has been affected by the recycled mixture properties, especially in terms of high-percentage asphalt reclaimed, which results in increased hardness of recycled asphalt. This increase in lower and middle temperatures can result in earlier occurrence of fatigue cracks and thermal cracks. One of the methods used today to improve the aging properties of RAP materials and the performance of recycled asphalt is the use of additives such as fibers in the manufacture of this type of asphalt. In the past, various types of fibers with different percentages in the production of recycled asphalt mixtures have been used. A review of past research shows that the type and amount of these materials have a significant effect on the performance of recycled asphalt, especially in cracking behavior.
Therefore, in this study, the effect of polypropylene fibers (0.06%, 0.12% and 0.18%) in asphalt mixtures containing 25%, 50%, 75% and 100% asphalt reclaimed was evaluated by performing fracture test. The results of this study, which have been evaluated using fracture mechanics, show that when using polypropylene fibers in the production of recycled asphalt mixtures, the adverse effects resulting from the use of asphalt reclaimed decreased on fracture resistance and cracked asphalt performance to a degree Significantly improved.
Keywords: Reclaimed Asphalt Pavement (RAP), recycled asphalt mixtures, cracking, fracture mechanic
