بررسی تاثیر استفاده از تراشه آسفالت بازیافتی و جوان‌ساز بر رفتار شکست مخلوط آسفالتی ‌گرم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی گروه مهندسی مکانیک دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشگاه صنعتی نوشیروانی بابل

3 دانشگاه علم وصنعت تهران_ایران

چکیده

بازیافت آسفالت یا به عبارت دیگر استفاده مجدد از روسازی ساخته شده، یکی از تکنولوژی­‌های جدید در حوزه راه‌­سازی است که در حال حاضر مقبولیت بیشتری نسبت به روش‌­های دیگر به‌سازی روسازی دارد. این تکنولوژی علاوه بر حفظ بهتر محیط‌زیست، کاهش هزینه قابل ­ملاحظه‌­ای را به دنبال دارد. اما یکی از نگرانی­‌های عمده استفاده بیشتر از آن، ایجاد ویژگی­‌های ناخواسته در مخلوط آسفالتی از قبیل پیرشدگی قیر و کاهش مقاومت در برابر ترک­‌خوردگی مخلوط­‌های آسفالتی است. از راه­ حل‌­های بهبود این مشکل، استفاده از افزودنی­‌های ­گرم و اصلاح­ کننده‌­های جوان‌ساز است. از این ‌رو، در این پژوهش به‌ منظور ارزیابی تأثیر استفاده از آسفالت بازیافتی در مقاومت شکست مخلوط‌­های آسفالتی ­گرم، از تراشه­‌های آسفالتی بازیافتی با دو مقدار مختلف 25 و 50 درصد، یک نوع جوان‌ساز به‌ عنوان عامل بازیافت و ساسوبیت به ‌عنوان افزودنی ­گرم استفاده‌ شده است. برای بررسی مقاومت شکست این مخلوط­‌های آسفالتی از آزمایش خمش نیم ­دایره­‌ای در دو دمای °C 15- و °C 25 تحت مود بارگذاری ɪ استفاده شد و پارامترهای شکست شامل حداکثر بار شکست، انرژی شکست، شاخص انعطاف‌­پذیری، نشانه­ مقاومت در برابر ترک­‌خوردگی و چقرمگی شکست محاسبه شدند. نتایج به ‌دست ‌آمده نشان داد که اضافه کردن تراشه‌های آسفالتی به مخلوط‌های آسفالتی در دماهای مختلف تأثیر منفی بر پارامترهای شکست داشته و باعث کاهش آن‌ها شد. در حالی‌ که نمونه­‌های آسفالتی حاوی جوان‌ساز نسبت به نمونه‌­های بدون جوان‌ساز حالت الاستیک­‌تر داشته و بنابراین، جوان‌ساز مقادیر پارامترهای شکست مخلوط­‌های آسفالتی را بهبود بخشیده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study on the effect of reclaimed asphalt pavement and rejuvenator on fracture behavior of WMA

نویسندگان [English]

  • Sadjad Pirmohammad 1
  • Saeid Sobhi 2
  • afshar yusefi 3
1 Faculty member of mechanical engineering, university of Mohaghegh Ardabili, Ardabil, Iran
2 Babol Noshirvani University of Technology
3 iust
چکیده [English]

Recycling or, in other words, reuse of pavement is one of the latest technologies in the field of road construction that is now more accepted than other pavement construction methods. In addition to better environmental protection, this technology results in significant cost savings. Still, one of the major concerns of its use is the creation of undesirable properties in asphalt mix, such as bitumen aging and reduced cracking resistance. The use of rejuvenation agent and WMA (warm mix asphalt) additive are the solutions to improve the performance of asphalt mixers containing RAP (reclaimed asphalt pavement) materials. Hence, in this research, in order to evaluate the effect of using RAP on the fracture resistance of WMA mixtures, the RAP materials with two dosages of 25% and 50%, one type of rejuvenation agent and Sasobit, as a WMA additive, were employed. To study the fracture resistance of the mixtures at the temperatures of -15 °C and 25 °C under mode I loading, semi-circular bending test was selected, and different fracture parameters including critical fracture load, fracture energy, flexibility index, cracking resistance index and fracture toughness were calculated. The results exhibited that the addition of RAP material to the mixture had a negative effect on the fracture parameters at different temperatures and resulted in the reduction of these parameters. While the mixtures containing rejuvenator showed more elastic behavior than those without rejuvenator. Therefore, the use of a rejuvenator led to the improvement of the fracture parameters.

کلیدواژه‌ها [English]

  • Semi-circular bending test
  • Warm Mix Asphalt (WMA)
  • Reclaimed Asphalt Pavement (RAP)
  • Rejuvenator
  • Resistance to cracking

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 10
دی 1400
صفحه 4413-4432

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