ارزیابی ارتباط بین پارامترهای عملکردی قیر و مخلوط آسفالتی در مخلوط‌های آسفالتی حاوی مصالح خرده آسفالتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی عمران، دانشکده عمران و معماری، دانشگاه ملایر، ایران

2 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران.

چکیده

در بازیافت گرم آسفالت، قیر سال‌خورده مستخرج شده از مصالح خرده آسفالتی را با نام  قیر بازیافتی می‌شناسند. در این تحقیق عملکرد ترکیبات قیری حاوی درصدهای مختلف قیر بازیافتی (0، 25 درصد و 50 درصد) و مخلوط‌های آسفالتی حاوی درصدهای مختلف مصالح خرده آسفالتی (0، 25 درصد و 50 درصد) در دو شرایط با و بدون استفاده از جوان‌ساز مقایسه شد. علاوه بر این چون هدف اصلی این تحقیق ارزیابی ارتباط بین پارامترهای عملکردی قیر و مخلوط آسفالتی بود، ارتباط بین پارامترهای به ‌دست آمده از آزمایش‌های خستگی و شیارشدگی قیر (به ترتیب آزمایش جاروب دامنه خطی و آزمایش خزش و بازیابی در چند سطح تنش) با پارامترهای به ‌دست آمده از آزمایش‌های خستگی و شیارشدگی مخلوط‌های آسفالتی (به ترتیب آزمایش تیر چهار نقطه‌ای و خزش دینامیکی) در مخلوط‌های حاوی مصالح خرده آسفالتی برای اولین بار بررسی شد. نتایج نشان داد که رفتار مخلوط‌های آسفالتی در آزمایش‌های مربوط به مقاومت خستگی و شیارشدگی با نتایج به‌ دست آمده از آزمایش جاروب دامنه خطی و آزمایش خزش و بازیابی در چند سطح تنش که بر روی ترکیبات قیری با درصدهای مختلف قیر بازیافتی صورت گرفته بود، هم سو می‌باشد. علاوه بر این از نظر آماری، ارتباط آماری خوبی بین عمر خستگی قیر و عمر خستگی مخلوط آسفالتی و ارتباط آماری نسبتا خوبی بین پارامترهای مقاومت شیارشدگی قیر و مقاومت شیارشدگی مخلوط‌های آسفالتی در مخلوط‌های حاوی مصالح خرده آسفالتی وجود دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the Correlation Between Performance Parameters of Asphalt Binder and Mixture in the RAP-Containing Asphalt Mixtures

نویسندگان [English]

  • Daryoosh Daryaee 1
  • Mahmood Ameri 2
1 School of civil engineering, Malayer university, Malayer, Iran
2 School of Civil Engineering, Iran University of Science and Technology (IUST).
چکیده [English]

In asphalt pavement hot recycling, reclaimed asphalt pavements called "RAP" and aged bitumen extracted from them are known as reclaimed asphalt binder (RAB). In this study, the performance of RAB-containing binder compounds with different percentages of recycled bitumen (0, 25%and 50%) and RAP-containing asphalt mixtures with varying contents of the RAP (0, 25% and 50%) were compared in two conditions (with and without a rejuvenating agent). The main purpose of this study was to evaluate the relationship between bitumen’s performance parameters and asphalt mixture’s performance parameters. Therefore, the correlation between the parameters obtained from the fatigue and the rutting tests of binder compounds (linear amplitude sweep test and multiple stress creep and recovery test, respectively) and parameters obtained from the fatigue and rutting tests of asphalt mixtures (four-point beam fatigue test and dynamic creep test, respectively) were investigated for the first time in RAP-containing asphalt mixtures. The results indicated that the behavior of asphalt mixtures in fatigue and rutting resistance was agreed with the behavior of the binder compounds in the linear amplitude sweep and multiple stress creep and recovery tests. Besides, there were statistically good correlations between the binder's fatigue life and asphalt mixtures' fatigue life and relatively good statistical correlations between binder's rutting resistance and asphalt mixtures' rutting resistance in the RAP-containing asphalt mixtures.

کلیدواژه‌ها [English]

  • Statistical correlation
  • Fatigue
  • Rutting
  • rejuvenator
  • RAB
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