پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی خصوصیات بتن آسفالتی بازیافتی حاوی نانوسیلیس و جوان کننده روغن موتور ضایعاتی و روغن خوراکی ضایعاتی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانش‌آموخته کارشناسی ارشد، گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران
2 دانشیار، گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران
چکیده
اخیرا، استفاده از آسفالت بازیافتی که در آن از مواد ضایعاتی استفاده می‌گردد به دلیل سازگاری با محیط زیست و اقتصادی بودن مورد توجه قرار گرفته است. با این حال چالش‌هایی در ارتباط با عملکرد این نوع مصالح وجود دارد. در این تحقیق، تاثیر استفاده از نانوسیلیس در رفتار آسفالت بازیافتی که فاقد جوان کننده بوده و همچنین با دو نوع روغن ضایعاتی جوانسازی شده بررسی شده است. قیر بکر با 5% نانوسیلیس اصلاح شده و در آسفالت بازیافتی که حاوی 60% خرده آسفالت ضایعاتی است به کار رفته است. مخلوط حاصل بدون استفاده از جوان کننده و جوانسازی شده با درصد ثابتی از روغن خوراکی و موتور ضایعاتی تحت آزمایش‌های مقاومت کششی غیر مستقیم در حالت خشک و مرطوب، خزش دینامیکی و خستگی تحت تنش ثابت قرار گرفته‌اند و عملکرد آنها با یکدیگر و با مخلوط کنترل که در آن از مصالح سنگی و قیر بکر استفاده شده مقایسه شده‌ است. آزمایشات مذکور در دو حالت پیر نشده و بعد از اعمال پیرشدگی بلند مدت انجام گرفته‌اند تا تاثیر پیرشدگی بر آنها نیز مطالعه گردد. نتایج آزمایش‌ها بیانگر این است که جایگزینی مصالح سنگی با خرده آسفالت ضایعاتی باعث افزایش مقاومت کششی، مقاومت خزشی، مقاومت به خستگی و افزایش حساسیت رطوبتی می‌گردد. همچنین، نتایج نشان می‌دهند که افزودن نانوسیلیس باعث افزایش مقاومت کششی در حالت خشک و مرطوب، مقاومت به آسیب رطوبتی، خزش و خستگی می‌شود. نانوسیلیس مقاومت به پیرشدگی آسفالت بازیافتی را نیز افزایش می‌دهد. از دیگر نتایج این مطالعه این است که روغنهای ضایعاتی باعث کاهش حساسیت رطوبتی می‌گردند و این تاثیر برای روغن خوراکی ضایعاتی بیشتر از روغن موتور ضایعاتی می‌باشد. همچنین، تاثیر پیرشدگی بر روی خواص مخلوطی که با روغن خوراکی جوانسازی شده است بیشتر از آن برای مخلوطی است که با روغن موتور ضایعاتی جوانسازی شده است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigating the Properties of Recycled Asphalt Concrete Modified by Nano-Silica and Rejuvenated by Waste Cooking and Engine Oil

نویسندگان English

Morteza Naji 1
Hasan Taherkhani 2
1 M.Sc., Grad., Civil Engineering Department, University of Zanjan, Zanjan, Iran.
2 M.Sc., Grad., Civil Engineering Department, University of Zanjan, Zanjan, Iran.
چکیده English

Using recycled asphalt mixtures, which are made by waste materials, have attracted attentions due to their environmental and economical benefits. However, challenges exist with the performance of the recycled mixtures. In this study, the effect of using nano-silica on the behavior of non-rejuvenated and rejuvenated recycled asphalt concrete has been investigated. Penetration grade asphalt binder modified by 5% of nano-silica has been used in recycled asphalt concrete containing 60% of reclaimed asphalt pavement (RAP). The mixture without rejuvenation and rejuvenated by a constant percentage of waste cooking oil and waste engine oil has been evaluated by indirect tensile strength test on dry and moisture conditioned samples, dynamic creep test and stress controlled fatigue test. The properties of the mixtures have been compared with each other and with the control mixture made by neat binder and aggregates. The tests have been conducted on the samples before aging and after undergoing long term aging condition to investigate the effect of aging on the properties. Results reveal that incorporating RAP into the mixture increases the tensile strength, resistance against creep and fatigue and decreases the moisture resistance of the mixture. Nano-silica modification increases the dry and conditioned tensile strength, resistance against permanent deformation and fatigue. Nano-silica also improves aging resistance of the recycled mixtures. Furthermore, results reveal that waste oils as rejuvenator improves moisture resistance of the mixtures with more improvement for waste cooking oil. In addition, the effect of aging on the properties of the mixture rejuvenated by waste cooking oil is higher than those rejuvenated by waste engine oil.

کلیدواژه‌ها English

Asphalt Mixture
RAP
Nano-Silica
Waste Engine Oil
Waste Cooking Oil
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