پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

تاثیر استفاده از فیلر خرده آسفالت بازیافتی بر خصوصیات مکانیکی مخلوط آسفالتی داغ

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانش آموخته کارشناسی ارشد‌، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2 استادیار، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
چکیده
خرده آسفالت بازیافتی (RAP) به دلیل پتانسیل استفاده مجدد در مخلوط‌های آسفالتی، هزینه‌های اقتصادی را کاهش داده و اثرات زیست‌محیطی را محدود می‌کند. با وجود مطالعات متعدد درباره‌ی تأثیر درصد­های مختلف RAP بر عملکرد مخلوط آسفالتی داغ (HMA)، تاکنون پژوهشی به بررسی نقش RAP به عنوان فیلر در مخلوط‌­های آسفالتی نپرداخته است. بنابر‌این به منظور افزایش بازیافت RAP در مخلوط­های آسفالتی، این پژوهش رویکرد جدیدی را با استفاده از RAP به عنوان فیلر در HMA بررسی می­نماید. در مرحله اول فیلر خرده آسفالت بازیافتی (فیلر RAP) به طور کامل جایگزین فیلر کنترول گردید و درصد قیر بهینه طبق استاندارد مارشال تعیین شد. سپس خواص مکانیکی مخلوط حاوی فیلر RAP با استفاده از آزمایش های خمش نیم­دایره (SCB)، خستگی کشش غیر­مستقیم (ITF)، ویلترک هامبورگ (HWT) و حساسیت رطوبتی  مورد ارزیابی قرار گرفت و نتایج با مخلوط شاهد مقایسه گردید. یافتهها نشان داد که استفاده از فیلر RAP باعث بهبود معناداری در خواص مکانیکی و همچنین دوام مخلوط آسفالتی می­گردد. به طوری که پارامتر‌های انرژی شکست و عمر خستگی به ترتیب 44% و 50%  افزایش یافت و نرخ گسترش میکروترک‌ها 60‌% کاهش یافت. همچنین شاخص TSR، 2‌% افزایش را نشان داد که بیانگر بهبود دوام مخلوط آسفالتی در برابرآسیب رطوبتی است. با توجه به نتایج آزمایش HWT، افزودن فیلر RAP تاثیر معناداری در عملکرد مخلوط آسفالتی در برابر شیارشدگی نشان نداد. بطورکلی می‌توان نتیجه گرفت که فیلر RAP خواص مکانیکی و حساسیت رطوبتی HMA را بهبود می‌بخشد. بنابراین استفاده از فیلر RAP در HMA را می توان  پیشنهاد نمود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Effect of Using Filler Obtained from Reclaimed Asphalt Pavement Material on the Mechanical Properties of Hot Mix Asphalt

نویسندگان English

Danyal Shirvani 1
Alireza Sarkar 2
1 M.Sc., Grad., Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran.
2 Assistant Professor, Department of Civil Engineering, SR.C., Islamic Azad University, Tehran, Iran.
چکیده English

Reclaimed asphalt pavement (RAP) is a valuable material that can be recycled and reused in road engineering to reduce environmental impacts and economic costs. Despite numerous studies on the effect of different RAP percentages on the performance of hot mix asphalt (HMA), no research has investigated the role of RAP as filler in asphalt mixtures. Consequently, in order to further recycle RAP in asphalt mixtures, this study investigates a new approach to using RAP as filler in hot mix asphalt. In the first step, reclaimed asphalt pavement filler (RAPF) was completely replaced with the control filler with the same percentage and the optimum bitumen content was determined according to the Marshall standard. The mechanical properties of the mixture containing RAPF were investigated by semi-circular bending (SCB), indirect tensile fatigue (IDT), hamburg wheel tracking (HWT) and modified lottman tests and compared with the control mixture. The results showed that RAPF significantly improved the mechanical properties as well as the durability of the mixture. The fracture energy parameter increased by 44% compared to the control mixture. The fatigue life was improved by 51% (2195 cycles more than the control mixture) and the microcracks propagation rate in the mixture was reduced by 60% (withstanding 1400 cycles more in the microcrack propagation area than the control mixture). The TSR index also increased by 2%, resulting in improved durability of the mixture against moisture damage. According to the results of the HWT test, using RAPF has no noticeable effect on the performance of the asphalt mixture at high temperatures and the results are similar to the control mixture. Finally, it can be acknowledged that RAPF improves the performance of the asphalt mixture at low and medium temperatures, as well as the moisture sensitivity of the mixture.

کلیدواژه‌ها English

Reclaimed Asphalt Pavement
RAP Filler
Fracture Mechanics
Fatigue
Thermal Cracking
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