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ارزیابی استفاده از نانو سیلیس در عملکرد مخلوط آسفالتی با تمرکز بر درصد مصرفی و میزان عمر پیرشدگی آسفالت بازیافتی | ||
| مهندسی زیر ساخت های حمل و نقل | ||
| دوره 11، شماره 3 - شماره پیاپی 43، آبان 1404، صفحه 1-20 اصل مقاله (1.07 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jtie.2025.37817.1724 | ||
| نویسندگان | ||
| اسماعیل طاهری1؛ غلامعلی شفابخش* 2؛ مصطفی صادق نژاد3 | ||
| 1دانشجوی دکتری راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران. | ||
| 2استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران. | ||
| 3استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه گیلان، رشت، ایران. | ||
| تاریخ دریافت: 03 خرداد 1404، تاریخ بازنگری: 03 مرداد 1404، تاریخ پذیرش: 04 مرداد 1404 | ||
| چکیده | ||
| استفاده از آسفالت بازیافتی (RAP) به دلیل پیرشدگی قیر میتواند عملکرد مخلوط را کاهش دهد. این پژوهش، اثر همزمان مقدار RAP، عمر RAP و نانو سیلیس (SiO₂) را بر مقاومت در برابر شکست، خستگی و حساسیت رطوبتی بررسی میکند. مخلوطهای آسفالتی با ۲۵، ۵۰ و ۷۵ درصد RAP با عمرهای ۵ و ۱۰ سال آزمایش شدند. همچنین، نانو سیلیس در مقادیر صفر، ۱، 5/1 و ۲ درصد وزنی به قیر اضافه شد. از آزمایش خمش نیمدایرهای برای مقاومت ترکخوردگی، آزمایش بارگذاری مکرر کششی غیرمستقیم برای عملکرد خستگی و آزمایش TSR برای حساسیت رطوبتی بهکار گرفته شدند. نتایج نشان داد که نانو سیلیس، بهویژه در مخلوطهای با RAP کمتر، مقاومت در برابر ترکخوردگی و خستگی را بهبود میبخشد. در نمونههای دارای ۲۵ درصد RAP، افزودن 5/1 و ۲ درصد نانو سیلیس، مقاومت شکست و خستگی را ۱۵ تا ۲۰ درصد افزایش داد. در مخلوطهای دارای ۵۰ و ۷۵ درصد RAP، بهترین نتایج در غلظت ۲ درصد نانو سیلیس مشاهده شد. نانو سیلیس حساسیت رطوبتی مخلوط آسفالتی را نیز کاهش داده و TSR را به بیش از ۸۰ درصد رساند و از طرفی اثرات پیرشدگی را کاهش داد. به طور کلی، برای دستیابی به مخلوطهای آسفالتی با عملکرد بالا، استفاده از ۲۵ تا ۵۰ درصد RAP همراه با 5/1 درصد نانو سیلیس توصیه میشود. | ||
| کلیدواژهها | ||
| اثر پیرشدگی؛ نانو سیلیس؛ خرابی رطوبتی؛ عملکرد خستگی؛ مقاومت شکست | ||
| عنوان مقاله [English] | ||
| Performance Evaluation of Nano Silica Used in Asphalt Mixture: Focus on the Content and Aging of Recycled Asphalt Pavement | ||
| نویسندگان [English] | ||
| Esmaeil Taheri1؛ Gholamali Shafabakhsh2؛ Mostafa Sadeghnejad3 | ||
| 1Ph.D. Candidate, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran. | ||
| 2Professor, Department of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran. | ||
| 3Assistant Professor, Department of Civil Engineering, University of Guilan, Rasht, I. R. Iran. | ||
| چکیده [English] | ||
| Incorporating recycled asphalt pavement (RAP) into asphalt mixtures is a common practice for sustainability. However, aging and hardening of the RAP binder can compromise performance. Aged RAP is stiffer, less flexible, and more prone to cracking. This research investigates the combined effects of RAP content, RAP age, and nano-silica (SiO₂) addition on asphalt performance, focusing on fracture resistance, fatigue resistance, and moisture susceptibility. Asphalt mixtures containing 25%, 50%, and 75% RAP were evaluated using RAP aged 5 and 10 years. Nano-SiO₂was incorporated at 0%, 1%, 1.5%, and 2%. Performance evaluations included semi-circular bending test for fracture resistance, indirect tensile fatigue test for fatigue resistance, and tensile strength ratio (TSR) test for moisture susceptibility. The findings indicated that nano-SiO₂significantly enhanced fracture and fatigue resistance, especially at lower RAP content. At 25% RAP, 1.5% and 2% nano-SiO₂improved both fracture and fatigue resistance by 15%-20%. Notable enhancements were observed for mixtures with 50% and 75% RAP, with optimal results at 2% nano-silica. Furthermore, nano-SiO₂improved moisture resistance, increasing TSR values above 80%. Nano-silica effectively mitigated aging effects, particularly in mixtures with higher RAP content. Based on this analysis, utilizing 25%-50% RAP combined with 1.5% nano-SiO₂is advisable for producing high-performance asphalt mixtures. | ||
| کلیدواژهها [English] | ||
| Effect of Aging, Nano-SiO₂, Moisture Damage, Fatigue Performance, Fracture Resistance | ||
| مراجع | ||
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