پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی آزمایشگاهی اثر افزودنی‌های استایرن–اتیلن/پروپیلن–استایرن و نانوسیلیس بر ویژگی‌های رئولوژیکی و مقاومت شیارشدگی قیر

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری‌، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران، ایران
2 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر (پلیتکنیک تهران)، تهران، ایران
3 استاد، دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر (پلیتکنیک تهران)، تهران، ایران
چکیده
قیر به‌عنوان یک ماده ویسکوالاستیک، رفتار مکانیکی وابسته به دما و نرخ بارگذاری دارد و شناخت دقیق ویژگی‌های رئولوژیکی آن برای پیش‌بینی خرابی‌های روسازی آسفالتی مانند شیارشدگی ضروری است. در این پژوهش، تأثیر افزودن نانوسیلیس و پلیمر استایرن–اتیلن/پروپیلن–استایرن (SEPS) بر عملکرد قیر خالص 85/100 بررسی شده است. برای تحلیل رفتار ویسکوالاستیک، منحنی‌های جامع مدول برشی پیچیده با استفاده از اصل برهم‌نهی زمان–دما و همچنین روش مبتنی بر داده‌های جاروب دما ترسیم و مقایسه گردید. به‌منظور ارزیابی مقاومت در برابر شیارشدگی، دو شاخص G*/sinδ و ویسکوزیته در برش صفر (ZSV) مورد استفاده قرار گرفت. نتایج نشان داد که نانوسیلیس به‌تنهایی تأثیر قابل‌توجهی بر بهبود مقاومت شیارشدگی ندارد، اما افزودن SEPS و ترکیب آن با نانوسیلیس موجب افزایش سختی، بهبود رفتار ویسکوالاستیک و ارتقای مقاومت قیر در برابر تغییر شکل دائمی در دماهای بالا می‌شود. همچنین مقایسه منحنی‌های جامع نشان داد که روش مبتنی بر داده‌های جاروب دما تطابق بسیار خوبی با روش کلاسیک داشته و می‌تواند در شرایط محدودیت آزمایش جاروب فرکانس به‌عنوان روشی معتبر مورد استفاده قرار گیرد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental Evaluation of the Effects of Styrene–Ethylene/Propylene–Styrene (SEPS) Polymer and Nanosilica Additives on the Rheological Properties and Rutting Resistance of Asphalt Binder

نویسندگان English

Alireza Askari 1
Reza Sepaspour 2
Fereydoun Maghaddas-Nejad 3
1 Ph.D., Student, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran.
2 Ph.D., Student, Faculty of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
3 Professor, Faculty of Civil and Environmental Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
چکیده English

Bitumen, as a viscoelastic material, exhibits mechanical behavior that depends on temperature and loading rate; therefore, accurate characterization of its rheological properties is essential for predicting asphalt pavement distresses such as rutting. In this study, the effects of adding nanosilica and styrene–ethylene/propylene–styrene (SEPS) polymer on the performance of 85/100 penetration grade bitumen were investigated. To analyze the viscoelastic behavior, master curves of the complex shear modulus were constructed and compared using both the time–temperature superposition principle and the method based on temperature sweep data. To evaluate rutting resistance, two indicators—Superpave rutting parameter (G*/sinδ) and zero-shear viscosity (ZSV)—were employed. The results showed that nanosilica alone does not significantly improve rutting resistance, whereas the addition of SEPS, either individually or in combination with nanosilica, increases stiffness, enhances viscoelastic behavior, and improves the bitumen’s resistance to permanent deformation at high temperatures. Furthermore, comparison of the master curves demonstrated that the method based on temperature sweep data exhibits good agreement with the classical approach and can be considered a reliable alternative when frequency sweep testing is limited.

کلیدواژه‌ها English

Styrene–ethylene/propylene–styrene (SEPS)
Asphalt binder
Master curve
Rutting resistance
Nanosilica
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