بررسی آزمایشگاهی مشخصات شکست و خستگی در مخلوط آسفالتی با استخوان‌بندی سنگدانه‌ای حاوی تراشه آسفالت بازیافتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد، دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران، ایران.

2 دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران، ایران

3 دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران، ایران.

چکیده

کیفیت روسازی تأثیر مهمی بر ایمنی، سرویس‌دهی و هزینه‌های نگهداری راه‌ها دارد. اخیراً، استفاده از مخلوط‌های آسفالتی تراشیده‌شده به دلیل مزایای زیست‌محیطی و اقتصادی مورد توجه قرار گرفته است. اما گرم کردن این مصالح برای استفاده مجدد می‌تواند باعث پیری و شکنندگی آسفالت شود. در نهایت، این مخلوط‌ها در دمای کم مستعد ترک‌خوردگی می‌شوند. بنابراین، با وجود مزایای زیست‌محیطی و اقتصادی، برای اطمینان از دوام و طول عمر روسازی‌های با استخوان‌بندی سنگدانه‌ای (SMA)، باید عملکرد ناپایدار و پتانسیل افزایش سختی و ترک‌خوردگی آن‌ها به دقت مدیریت شود. در این پژوهش، به بررسی خصوصیات شکست مخلوط آسفالتی با استخوان‌بندی سنگدانه‌ای در دمای کم (12- درجه سلسیوس) و خستگی مخلوط در دمای متوسط (25 درجه سلسیوس) ‌پرداخته شد. بدین منظور، از مقادیر مختلف (صفر، 15 و 30 درصد) تراشه‌های آسفالت بازیافتی به عنوان جایگزین سنگدانه در مخلوط‌های آسفالتی با استخوان‌بندی سنگدانه‌ای استفاده شده‌ و تأثیرات این جایگزینی در مشخصات مخلوط‌ها مورد بررسی قرار گرفت. در نهایت، انرژی شکست مخلوط‌های آسفالتی که از روغن جوانساز استفاده شده، بیشتر از مخلوط‌هایی است که بدون روغن جوانساز هستند. این افزایش انرژی شکست در دمای کم به‌طور قابل توجهی مشهود است. بررسی شاخص انعطاف‌پذیری (FI) نشان می‌دهد که با افزودن تراشه آسفالتی، بدون استفاده از روغن جوانساز، انعطاف‌پذیری حدود 30 درصد کمتر از نمونه شاهد می‌شود. اما با استفاده از روغن جوانساز، شاخص انعطاف‌پذیری تقریباً دو برابر بیشتر از نمونه شاهد می‌شود؛ به‌طوری که در بارگذاری مود اول 85 درصد و در مود دوم 113 درصد افزایش یافته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Laboratory Investigation of Fracture and Fatigue Characteristics in Stone Mastic Asphalt (SMA) Mixtures Containing Reclaimed Asphalt Pavement (RAP)

نویسندگان [English]

  • Mansour Fakhri 1
  • Alireza Hadi 2
  • Morteza Ghanbari 3
1 Professor, Department of Road and Transportation, Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran, I. R. Iran.
2 Department of Road and Transportation, Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran, I. R. Iran.
3 Department of Road and Transportation, Faculty of Civil Engineering, K.N. Toosi University of Technology, Tehran, I. R. Iran.
چکیده [English]

Pavement quality significantly impacts road safety, serviceability, and maintenance costs. Recently, the use of reclaimed asphalt mixtures has gained attention due to their environmental and economic benefits. However, reheating these materials for reuse can lead to asphalt aging and embrittlement. Consequently, these mixtures are susceptible to low-temperature cracking. Therefore, despite environmental and economic advantages, the unstable performance and potential for increased stiffness and cracking in stone mastic asphalt (SMA) pavements must be carefully managed to ensure durability and service life. This study investigates the fracture properties of SMA mixtures at low temperature (-12 °C) and fatigue behavior at intermediate temperature (25 °C. Different percentages (0%, 15%, and 30%) of reclaimed asphalt pavement (RAP) were used as a substitute for aggregate in SMA mixtures to examine the effects of this substitution on mixture properties. Results indicated that the fracture energy of asphalt mixtures using rejuvenating oil was higher than those without rejuvenating oil. This increase in fracture energy was significantly observed at low temperatures. The flexibility index (FI) analysis showed that adding asphalt shingles without rejuvenating oil reduced flexibility by about 30% compared to the control sample. However, using rejuvenating oil increased the flexibility index by almost twofold compared to the control sample; with an 85% increase in the first mode of loading and a 113% increase in the second mode.

کلیدواژه‌ها [English]

  • Flexible pavement
  • Stone mastic asphalt (SMA)
  • Reclaimed asphalt pavement (RAP)
  • Fracture test
  • Fracture energy

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  • تاریخ دریافت: 05 مهر 1403
  • تاریخ بازنگری: 16 آبان 1403
  • تاریخ پذیرش: 21 آبان 1403

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