پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

ارزیابی پیرشدگی قیر اصلاح شده با ساسوبیت و پلیمر اتیلن وینیل استات (EVA) با مطالعه ریزساختار آنها با استفاده از میکرسکوپ نیروی اتمی (AFM)

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه مهندسی عمران، واحد علوم و تحقیقات آذربایجان شرقی، دانشگاه آزاد اسلامی، تبریز، ایران
2 دانشیار گروه مهندسی عمران، دانشگاه زنجان، زنجان، ایران
3 دانشیار، گروه مهندسی عمران، دانشگاه محقق اردبیلی، اردبیل، ایران
4 دانشیار، گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
چکیده
مطالعه خصوصیات قیر با استفاده از میکروسکوپ نیروی اتمی (AFM) در سالهای اخیر رایج شده است. در این پژوهش، ریزساختار یک قیر خالص در سه حالت اصلاح نشده، اصلاح شده با 3% ساسوبیت و اصلاح شده با 3% پلیمر اتیلن وینیل استات (EVA) و 3% ساسوبیت به طور همزمان با استفاده از میکروسکوپ نیروی اتمی مورد مطالعه قرار گرفته است. قیرها در سه حالت پیر نشده، پیرشده کوتاه مدت و پیر شده بلند مدت مورد بررسی قرار گرفته اند تا تاثیر افزودنی ها و شرایط پیرشدگی بر روی ساختار زنبوری و شاخص‌های ناهمواری سطح مطالعه گردد. نتایج بررسی نشان می‌دهد که افزودن ساسوبیت و پلیمر EVA به قیر و اعمال پیرشدگی باعث تغییر در ریزساختار قیر می‌گردند. در حالت پیرنشده، تعداد ساختار زنبوری و چگالی آنها در قیرهای اصلاح شده بیشتر از قیر پایه و میانگین اندازه و مساحت هر ساختار بیشتر از قیر پایه است. همچنین، مساحت کل ساختار زنبوری در قیر حاوی ساسوبیت کمتر از قیر پایه و در قیر حاوی ساسوبیت و EVA بیشتر از قیر پایه است. در حالی که در قیر پایه، پیرشدگی مساحت کل ساختار زنبوری، تعداد آنها و میانگین اندازه هر ساختار زنبوری را افزایش می‌دهد، در قیرهای اصلاح شده، باعث کاهش تعداد ساختار زنبوری، مساحت کل ساختار زنبوری و چگالی آنها می‌شود. بررسی ناهمواری سطح نمونه‌ها نیز بیانگر این است که با افزودن ساسوبیت و پلیمر EVA ناهمواری سطح قیر پایه بیشتر می‌شود که نشان دهنده افزایش سختی قیر با این افزودنی‌هاست. همچنین، پیرشدگی باعث افزایش شاخص‌های ناهمواری در قیر پایه می‌شود. اما، در قیرهای اصلاح شده پیرشدگی باعث کاهش پارامترهای ناهمواری می‌شود که بیان کننده مقاومت بیشتر قیرهای اصلاح شده در برابر پیرشدگی می‌باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Evaluating the Aging of Asphalt Binder Modified by Sasobit and Ethylene Vinyl Acetate (EVA) by Exploring the Microstructure Using Atomic Force Microscopy (AFM)

نویسندگان English

Hadi Koushaeian 1
Hasan Taherkhani 2
Babak Golchin 3
Rasool Jani 4
Roozbeh Dabiri 4
1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tabriz, Iran
2 Associate professor, Department of Civil Engineering, University of Zanjan, Zanjan, Iran
3 Associate professor, Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
4 Associate Professor, Department of Civil Engineering, Ta.C, Islamic Azad University, Tabriz, Iran.
چکیده English

Using atomic force microscopy for investigating the properties of asphalt has been common in recent years. In this study, the microstrucure of an asphalt cement modified by 3% (by weight) Sasobit and 3% ethylene vinyl acetate (EVA) has been studied using AFM. The binders have been studied in unaged condition and after being aged using rolling thin film oven test (RTFOT) and pressure aging vessel (PAV) to find the effect of aging condition and additives on the microstructure through the change in bee structures and surface roughness. Results revealed that the additives and aging changed the asphalt microstructure. In unaged condition, the density and number of bee structures, and the mean size and area of bee structures in modified binders are more than those of the base binder. The total area occupied by the bee structures for the Sasobit modified asphalt is less than that for the base binder; and for the EVA and Sasobit modified binder is higher than that for the base binder. While, the aging increases the total area, number and mean size of bee structures in the unmodified asphalt binder, it causes reduction of the number, density and total area of bee structures in modified binders. The roughness of samples’ surface reveals that the additives increase the surface roughness of the base binder, indicating that the stiffness is improved using the additives. Moreover, the roughness increases with aging in the base binder; however, in modified binders, the aging results in reduction of roughness indices; indicating that the modified binders are less sensitive to aging compared with the base binder.

کلیدواژه‌ها English

Asphalt binder
aging
atomic force microscopy (AFM)
sasobit
ethylene vinyl acetate (EVA)
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