نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران، ایران
2 استاد، دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران
3 دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The use of Reclaimed Asphalt Pavement (RAP) in Stone Mastic Asphalt (SMA) mixtures offers environmental and economic advantages. However, incorporating RAP into SMA can introduce challenges related to rutting, particularly under heavy traffic and high temperatures. This study investigates the influence of different RAP gradations (fine and coarse) and percentages (0%, 15%, and 30%) on the performance of SMA mixtures. Additionally, the effects of waste engine oil (WEO) and rubber process oil (RPO) on the penetration, softening point, bitumen bleeding, and resistance to deformation of RAP-modified SMA mixtures were examined. Results indicated that increasing RAP content directly decreased bitumen bleeding. The resistance to deformation (S_D) value was higher in mixtures containing fine RAP due to the uniform distribution of smaller particles and increased surface area, which enhanced bitumen-aggregate bonding and reduced vertical deformation. Conversely, coarse RAP, owing to its more robust structure, exhibited a higher capacity to withstand applied loads, resulting in increased maximum resistance. The combination of these two mechanisms provided nearly equal performance in terms of ultimate strength. Furthermore, WEO exhibited a positive effect, with an average improvement of 11.1% compared to RPO, which could be attributed to the chemical and structural properties of WEO that enhance bitumen-aggregate cohesion and bonding in the presence of RAP.
کلیدواژه‌ها [English]
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