پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

مدل‌سازی و طراحی بهینه آسفالت بازیافتی حاوی الیاف در دمای پایین با استفاده از روش پاسخ سطح

نوع مقاله : مقاله پژوهشی

نویسندگان
امیر امینی 1
رضا اکبری 2
احمد صفری محمدی 3
1 گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 دانش‌آموخته دکتری، دانشکده مهندسی عمران، دانشگاه فنی تهران، تهران، ایران
3 دانش‌آموخته کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
10.22034/tri.2025.481825.3285
چکیده
مخلوط‌های حاوی درصدهای بالای تراشه آسفالت معمولاً با چالش‌هایی در تولید و تراکم مواجه هستند و ممکن است منجر به ترک‌های ریز و خرابی‌های زودرس شوند. به همین دلیل، اصلاح ویژگی‌های فنی و عملکردی این مخلوط‌ها ضروری است. استفاده از الیاف، به‌ویژه الیاف شیشه، می‌تواند به بهبود مقاومت خستگی و ترک‌خوردگی کمک کند. هدف این تحقیق، ارائه مدل پیش‌بینی و بهینه‌سازی برای ویژگی‌های شکست آسفالت بازیافتی با درصد بالای تراشه آسفالت و الیاف در دماهای پایین با استفاده از روش پاسخ سطح می‌باشد. به این منظور، مقادیر 0.06%، 0.12% و 0.18% الیاف شیشه به مخلوط‌های آسفالتی با درصدهای مختلف تراشه آسفالت اضافه شد و انرژی شکست، انرژی کل شکست و J- انتگرال در دمای 15- درجه سانتی‌گراد اندازه‌گیری شد. نتایج این تحقیق نشان داد که الیاف شیشه تأثیر مثبتی بر عملکرد شکست مخلوط‌های بازیافتی دارند و می‌توانند به‌عنوان مکمل و اصلاح‌کننده در مخلوط‌های حاوی تراشه آسفالت مورد استفاده قرار گیرند. علاوه بر این، نتایج مدل‌سازی نشان داد که مدل‌های توسعه‌یافته از نظر ضریب همبستگی و تابع دقت، قابلیت مناسبی در پیش‌بینی ویژگی‌های شکست آسفالت بازیافتی حاوی الیاف دارند. در نهایت، برای به حداکثر رساندن مقاومت شکست آسفالت در برابر ترک‌خوردگی در دماهای پایین، مقادیر بهینه برای الیاف 14/0 درصد و برای تراشه آسفالت مقدار 3/67 درصد پیشنهاد شد. بر اساس نتایج کلی تحقیق، اگر از ترکیب بهینه استفاده شود، انرژی شکست، انرژی کل و انتگرال J به ترتیب 40%، 39% و 59% نسبت به مقادیر میانگین آزمایشگاهی افزایش می‌یابند، که این تأثیرگذاری منجر به بهبود کیفیت روسازی و صرفه‌جویی اقتصادی خواهد شد.
کلیدواژه‌ها
تراشه آسفالت بازیافتی
الیاف شیشه
مقاومت ترک‌خوردگی
بهینه‌سازی
روش پاسخ سطح

موضوعات

عنوان مقاله English

Modeling and Design Optmization of Recycled Asphalt Containing Fibers at Low Temperature Using Response Surface Method

نویسندگان English

Amir Amini 1
Reza Akbari 2
Ahmad Safari Mohammadi 3
1 Department of Civil Engineering, Na.C, Islamic Azad University, Najafabad, Iran.
2 Ph.D., Grad., Department of Civil Engineering, University of Tehran, Tehran, Iran.
3 M.Sc., Grad., Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده English

Asphalt Mixtures containing high percentages of Reclaimed Asphalt Pavement (RAP) often face challenges in production and compaction, which can lead to micro-cracking and premature failures. Therefore, it is essential to improve the technical and performance characteristics of these mixtures. The use of fibers, especially glass fibers, can help enhance fatigue resistance and crack resistance. The aim of this research is to provide a predictive and optimization model for the failure characteristics of recycled asphalt with a high percentage of RAP and fibers at low temperatures using the Response Surface Methodology (RSM). For this purpose, 0.06%, 0.12%, and 0.18% glass fibers were added to asphalt mixtures with different percentages of RAP, and the fracture energy, total fracture energy, and J-integral were measured at -15 degrees Celsius. The results showed that glass fibers have a positive effect on the failure performance of recycled mixtures and can be used as an additive and modifier in RAP-containing mixtures. Additionally, the modeling results indicated that the developed models have a suitable capability in predicting the failure characteristics of fiber-containing recycled asphalt in terms of correlation coefficient and accuracy function. Finally, to maximize the fracture resistance of asphalt against cracking at low temperatures, optimal values of 0.14% for fibers and 67.3% for RAP were recommended. Based on the overall results of the research, if the optimal combination is used, fracture energy, total energy, and the J-integral can increase by 40%, 39%, and 59%, respectively, compared to average laboratory values, leading to improved pavement quality and economic savings.

کلیدواژه‌ها English

Recycled Asphalt Pavement
Glass Fibers
Cracking Resistance
Optimization
Response Surface Method
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