بررسی تأثیر استفاده از جوانسازهای پلیمری بر عملکرد مخلوط آسفالت بازیافتی

نوع مقاله : علمی - پژوهشی

نویسندگان
حسن زیاری 1
مهند البیاتی 2
یوسف امجدیان 3
1 استاد گروه راه و ترابری، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران، ایران
2 دانشجوی کارشناسی ارشد راه و ترابری، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران، ایران
3 دانشجوی دکتری راه و ترابری، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران، ایران
10.22119/jte.2023.379241.2640
چکیده
بسیاری از محققان نشان داده اند که استفاده هم زمان از جوانساز و قیر پلیمری می­تواند عملکرد ترک خوردگی،  خستگی و شیارشدگی مخلوط­ های آسفالتی بازیافتی را بهبود بخشد. با این حال تحقیقات محدودی بر روی جوانسازهای اصلاح شده با پلیمر صورت گرفته و ابهامت زیادی در خصوص عملکرد این جوانسازها بر روی رفتار مخلوط آسفالت بازیافتی وجود دارد. بنابراین در این تحقیق به بررسی مقاومت مخلوط­ های آسفالتی بازیافتی حاوی 0، 25، 50 و 75 درصد تراشه آسفالت و جوانسازهای پلیمری مانند نانوپلی، جوانساز پلیمری تیس و روغن‌ خوراکی بازیافتی حاوی پودر لاستیکی پرداخته شده و نتایج به دست آمده با جوانساز غیر پلیمری رایج وکیوم باتوم مقایسه شدند. برای این کار پس از یافتن درصد بهینه هر جوانساز و انجام آزمایشات طرح اختلاط، آزمایشات خزش دینامیکی، حساسیت رطوبتی و شکست نمونه SCB بر روی نمونه­ های مختلف انجام شد. نتایج به دست آمده نشان می ‎دهد که اصلاح جوانسازها با پلیمر تا حد قابل قبولی مقاومت در برابر شیار شدگی را بهبود می ­بخشد. طبق نتایج به دست آمده، مخلوط‌های حاوی جوانسازهای پلیمری نانوپلی و تیس علی رغم این که عملکرد ضعیف ­تری در برابر شروع ترک دارند، در برابر رشد ترک عملکرد بهتری داشته و ترک در آن­ها دیرتر رشد می­ کند. مخلوط ­های حاوی جوانساز تیس و نانوپلی در برابر حساسیت رطوبتی هم عملکرد مناسبی از خود نشان دادند. مخلوط­ های حاوی جوانساز روغن خوراکی پودر لاستیکی عملکرد مناسبی در برابر ترک خوردگی و حساسیت رطوبتی نداشتند.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Evaluating the Effect of Polymer Rejuvenators on the Recycled Asphalt Mixture Performance

نویسندگان English

Hassan Ziari 1
Mohanad Albayati 2
Youssef Amjadian 3
1 Professor, Department of Road and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
2 M.Sc., Department of Road and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
3 Ph.D Student, Department of Road and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

Many researchers have shown that using rejuvenators and polymer-modified bitumen can improve the performance of recycled asphalt mixtures against cracking, fatigue, and rutting. Nevertheless, limited research has been performed on modified rejuvenators with polymer, and there are many obscurities on the performance of these rejuvenators on the behavior of the recycled asphalt mixture. Therefore, in this research, the performance of 25%, 50%, and 75% RAP mixtures containing polymer rejuvenator (i.e., nanopoly, Tiss, and crumb rubber modified waste cooking oil (MWCO)) and vacuum bottom have been studied, and the results were compared together. For this purpose, after obtaining the optimal percentage of each rejuvenator and performing the mix design formula tests, the dynamic creep test, moisture sensitivity test, and semi-circular bending test were conducted. The results show that the modification of rejuvenators with polymer improves the rutting resistance of mixtures. Also, the mixtures containing nanopoly and Tiss, despite the weaker initial cracking resistance, have a better performance against the growth of the crack. Furthermore, the mixtures containing tiss and nanopoly showed a good performance against moisture sensitivity. The mixtures containing MWCO did not perform well against cracking and moisture sensitivity.

کلیدواژه‌ها English

recycled asphalt
rejuvenator
waste cooking oil
crumb rubber
polymer rejuvenator
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  • تاریخ دریافت 12 دی 1401
  • تاریخ بازنگری 10 خرداد 1402
  • تاریخ پذیرش 16 خرداد 1402