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Taheri, Esmaiel, Shafabakhsh, Gholamali, Sadeghnejad, Mostafa. (1403). Comprehensive Assessment of Nano-Silica Modified Asphalt Mixtures: Influence of RAP Content, Aging, and Performance Characteristics. نشریه هنرهای کاربردی, (), -. doi: 10.22075/jrce.2025.36705.2259
Esmaiel Taheri; Gholamali Shafabakhsh; Mostafa Sadeghnejad. "Comprehensive Assessment of Nano-Silica Modified Asphalt Mixtures: Influence of RAP Content, Aging, and Performance Characteristics". نشریه هنرهای کاربردی, , , 1403, -. doi: 10.22075/jrce.2025.36705.2259
Taheri, Esmaiel, Shafabakhsh, Gholamali, Sadeghnejad, Mostafa. (1403). 'Comprehensive Assessment of Nano-Silica Modified Asphalt Mixtures: Influence of RAP Content, Aging, and Performance Characteristics', نشریه هنرهای کاربردی, (), pp. -. doi: 10.22075/jrce.2025.36705.2259
Taheri, Esmaiel, Shafabakhsh, Gholamali, Sadeghnejad, Mostafa. Comprehensive Assessment of Nano-Silica Modified Asphalt Mixtures: Influence of RAP Content, Aging, and Performance Characteristics. نشریه هنرهای کاربردی, 1403; (): -. doi: 10.22075/jrce.2025.36705.2259

Comprehensive Assessment of Nano-Silica Modified Asphalt Mixtures: Influence of RAP Content, Aging, and Performance Characteristics

Journal of Rehabilitation in Civil Engineering
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 14 اسفند 1403
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22075/jrce.2025.36705.2259
نویسندگان
Esmaiel Taheri1؛ Gholamali Shafabakhsh* 2؛ Mostafa Sadeghnejad3
1Ph.D. Candidate, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3Department of Civil Engineering, University of Guilan, Rasht, Iran
تاریخ دریافت: 08 بهمن 1403،  تاریخ بازنگری: 04 اسفند 1403،  تاریخ پذیرش: 13 اسفند 1403 
چکیده
Using recycled asphalt pavement (RAP) in asphalt mixtures is common for improving sustainability, but it can lower performance because of the aging and hardening of RAP binder. Aged RAP is stiffer, less flexible, and more prone to cracking. The performance decreases with the age of RAP. Adding materials like nano-materials can help reduce these issues. This study investigates the combined impact of RAP content, RAP age, and Nano-silica (SiO₂) on asphalt performance, focusing on fracture resistance, fatigue resistance, and moisture susceptibility. Asphalt mixtures with 25%, 50%, and 75% RAP were tested using two types of RAPs with different ages (5 and 10 years). Nano-SiO₂ was added in varying percentages (0%, 1%, 1.5%, and 2%) to evaluate its effects. The performance was assessed using the semi-circular bending test for fracture resistance, the indirect tensile fatigue test for fatigue resistance, and the tensile strength ratio (TSR) test for moisture susceptibility. Results showed that Nano-SiO₂ improved the fracture and fatigue resistance of mixtures, especially those with lower RAP content. At 25% RAP, the addition of 1.5% and 2% Nano-SiO₂ enhanced fracture and fatigue resistance by 15-20%. For mixtures with 50% and 75% RAP, Nano-SiO₂ led to significant improvements, with the best results seen at 2% nano-silica. Nano-SiO₂ also enhanced moisture resistance, increasing TSR values above the 80% threshold. Nano-silica mitigated the effects of aging, particularly in mixtures with higher RAP content. According to this comprehensive evaluation, it is recommended to use 25-50% of RAP using 1.5% of Nano-SiO₂ to achieve high-performance mixtures.
کلیدواژه‌ها
Aging effect؛ Nano-silica؛ Fracture resistance؛ Fatigue life؛ Moisture susceptibility
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تعداد مشاهده مقاله: 75


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