پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

طراحی بهینه قیرهای لاستیکی با افزودنی‌های PPA و ساسوبیت: ارزیابی رئولوژیکی، خستگی و عملکرد دمایی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
2 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
چکیده
این مطالعه با هدف بررسی و بهینه‌سازی اثرات ترکیبی افزودنی‌های پلی‌فسفریک اسید (PPA) و ساسوبیت بر خواص مکانیکی و عملکردی قیرهای لاستیکی با رده‌های ARB58 و ARB64 انجام شد. با استفاده از روش پاسخ سطح (RSM) و مجموعه‌ای از آزمایش‌های گسترده آزمایشگاهی، تأثیر هم‌زمان PPA، پودر لاستیک بازیافتی (GTR) و ساسوبیت در دو سناریو مورد ارزیابی قرار گرفت. در سناریوی اول، دو قیر با رده‌های عملکردی PG64-22 و PG58-22 با افزودنی‌های GTR و PPA اصلاح شدند، و در سناریوی دوم همان قیرها همراه با ۲٪ ساسوبیت تحت شرایط آسفالت گرم‌میکس کم‌دما (WMA) مورد بررسی قرار گرفتند. پارامترهایی از جمله G*/Sinδ، m-value، Jnr و عمر خستگی اندازه‌گیری شدند و نقش مؤثر این افزودنی‌ها در بهبود مقاومت خستگی و مقاومت در برابر تغییر شکل‌های دائمی تأیید گردید. نتایج آزمایشگاهی نشان داد که افزودن PPA و ساسوبیت به قیر نرم‌تر (ARB58) موجب افزایش قابل توجه مقاومت خستگی و عملکرد دمایی می‌شود، به‌ویژه در شرایط کرنش پایین که معمولاً در روسازی‌های ضخیم رخ می‌دهد. مدل‌های توسعه یافته قادر بودند عملکرد ترکیبات بهینه را با دقت بالا پیش‌بینی کنند و میانگین خطای کمتر از ۱۰ درصد را نشان دادند. در تحلیل عملکردی، ترکیب بهینه افزودنی‌ها برای قیر ARB58 شامل 1.49٪ PPA و 0.97٪ ساسوبیت و برای قیر ARB64 شامل 1.50٪ PPA و 0.88٪ ساسوبیت بود که باعث افزایش سختی، مقاومت خستگی و بهبود خواص دمای پایین شد. در سناریوی اقتصادی، با کاهش مقدار افزودنی‌ها به حدود 1.18٪ PPA و 0.59٪ ساسوبیت برای ARB58 و 1.16٪ PPA و 0.55٪ ساسوبیت برای ARB64، عملکرد قیرها همچنان در سطح مطلوب حفظ شد و هزینه‌های اصلاح به طور مؤثری کاهش یافت. این پژوهش راهکارهای علمی و عملی برای انتخاب ترکیب بهینه اصلاح‌کننده‌ها ارائه می‌دهد و می‌تواند در طراحی قیرهای اصلاح‌شده با دوام و عملکرد بالا، متناسب با شرایط مختلف جوی و ترافیکی، مورد استفاده قرار گیرد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Optimal Design of Rubberized Binders Modified with PPA and Sasobit: Rheological, Fatigue, and Thermal Performance Evaluation

نویسندگان English

Amir Amini 1
Ehsan Hajian 2
1 Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran.
2 M.Sc, Grad., Department of Civil Engineering, Na.C., Islamic Azad University, Najafabad, Iran.
چکیده English

This study aims to investigate and optimize the combined effects of polyphosphoric acid (PPA) and Sasobit additives on the mechanical and performance-related properties of rubberized asphalt binders with ARB58 and ARB64 grades. Using the Response Surface Methodology (RSM) in conjunction with an extensive experimental program, the simultaneous influence of PPA, ground tire rubber (GTR), and Sasobit was evaluated under two distinct scenarios. In the first scenario, asphalt binders with performance grades PG58-22 and PG64-22 were modified with GTR and PPA, while in the second scenario, the same binders were further modified with 2% Sasobit under warm mix asphalt (WMA) conditions. Key performance indicators, including G*/sinδ, m-value, non-recoverable creep compliance (Jnr), and fatigue life, were measured to assess the effectiveness of the modifiers. The results confirmed the significant role of PPA and Sasobit in enhancing fatigue resistance and resistance to permanent deformation. Experimental findings revealed that the incorporation of PPA and Sasobit into the softer binder (ARB58) led to a substantial improvement in fatigue resistance and thermal performance, particularly under low strain levels typically associated with thick pavement structures. The developed RSM-based models demonstrated high predictive accuracy for optimal binder compositions, with an average error of less than 10%. From a performance-oriented optimization perspective, the optimal additive contents for ARB58 were identified as 1.49% PPA and 0.97% Sasobit, while for ARB64, the optimal values were 1.50% PPA and 0.88% Sasobit. These combinations resulted in increased stiffness, enhanced fatigue resistance, and improved low-temperature performance. In the economic optimization scenario, reducing the additive contents to approximately 1.18% PPA and 0.59% Sasobit for ARB58 and 1.16% PPA and 0.55% Sasobit for ARB64 maintained acceptable performance levels while significantly lowering modification costs.

کلیدواژه‌ها English

Modified bitumen
Sasobit
Fatigue resistance
Bitumen thermal performance
Design optimization
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