بررسی خصوصیات مکانیکی مخلوط آسفالتی با استخوان‏بندی سنگ‏دانه‏ای (SMA) اصلاح‌شده با نانواکسید گرافن کاهش ‏یافته

شهریاری, احسان; فخری, منصور

doi:10.22075/jtie.2022.26070.1586

بررسی خصوصیات مکانیکی مخلوط آسفالتی با استخوان‏بندی سنگ‏دانه‏ای (SMA) اصلاح‌شده با نانواکسید گرافن کاهش ‏یافته

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد،دانشکده عمران، دانشگاه صنعتی خواجه نصیر طوسی، تهران

² استاد، دانشکده مهندسی عمران، دانشگاه خواجه نصیر طوسی، تهران

10.22075/jtie.2022.26070.1586

چکیده

با افزایش روزافزون استفاده از راه‏های آسفالتی، طراحی و ساخت روسازی آسفالتی که بتواند در برابر خرابی‏های مختلف مقاومت کند، ضروری است. استفاده از نانومواد به دلیل ویژگی‏های منحصر به فرد و برجسته آنها در صنعت روسازی آسفالتی، برای اصلاح خواص مکانیکی آسفالت، در سال‏های اخیر بسیار مورد توجه قرار گرفته است. این پژوهش، اثرات نانواکسید گرافن کاهش‏یافته (RGO) را بر خصوصیات مکانیکی مخلوط آسفالتی با استخوان‏بندی سنگ‏دانه‏ای (SMA) بررسی کرده است. در این مطالعه، از آزمون مقاومت کششی غیرمستقیم، آزمایش خزش استاتیک و آزمون بیرون‏کشیدگی برای بررسی اثر نانواکسید گرافن کاهش‏یافته بر خصوصیات مکانیکی این آسفالت استفاده شده است. قیر خالص با سه درصد متفاوت از نانواکسید گرافن کاهش‏یافته (2/0، 4/0 و 6/0 درصد وزن قیر مصرفی) اصلاح شد. نتایج آزمایش‏های انجام شده نشان داد که افزودن نانواکسید گرافن کاهش‏یافته در قیر خالص باعث افزایش نقطه نرمی، ویسکوزیته و وزن مخصوص و کاهش نفوذپذیری و شکل‏پذیری قیر خالص می‏شود. نتایج آزمایش‏های مکانیکی نشان داد که افزایش نانواکسید گرافن کاهش‏یافته منجر به افزایش مقاومت کششی غیرمستقیم، مقاومت چسبندگی، کرنش تجمعی، کاهش سختی خزشی و بهبود حساسیت رطوبتی در مخلوط‏های SMA می‏شود. به طور کلی، 6/0 درصد از این ماده نانو باعث ایجاد تغییرات قابل توجهتری در خصوصیات مکانیکی مخلوط‏های SMA نسبت به سایر مقادیر شد. به طوری که افزودن 6/0 درصد از این افزودنی در SMA باعث %23 افزایش در شاخص TSR، %48 افزایش در مقاومت چسبندگی در حالت مرطوب و 43% کاهش در سختی خزشی نسبت به مخلوط کنترل شد.

کلیدواژه‌ها

موضوعات

روسازی

عنوان مقاله [English]

Investigation of mechanical properties of stone mastic asphalt mix (SMA) modified with Nano Reduced Graphene Oxide

نویسندگان [English]

ehsan shahryari ¹
Mansour Fakhri ²

¹ Master student, Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran

² Professor, Head of Department of Transportation, School of Civil Engineering, K.N.Toosi University of Technology, Tehran 1996715433, Iran

چکیده [English]

With the increasing use of asphalt roads, it is necessary to design and produce asphalt pavements that can withstand various damages such as rutting damage, cracking, and moisture damage. The use of nanomaterials due to their excellent and unique features in the asphalt pavement industry to improve the mechanical properties of asphalt has welcomed broad attention in recent years. This study examined the impacts of Nano Reduced Graphene Oxide (RGO) on the mechanical properties of stone mastic asphalt mixture (SMA). In this study, indirect tensile strength test, static creep test, and Pull-off adhesion test were used to investigate the effect of Nano reduced graphene oxide on the mechanical properties of SMA mixture. The pure asphalt binder was modified with three different percent of Nano RGO (0.2 %, 0.4 %, and 0.6 % by weight of bitumen used in asphalt samples in this study). The experiments performed on modified bitumen in this study show that the addition of Nano reduced graphene oxide in pure bitumen raises the viscosity, softening point, and specific gravity and reduces the ductility and penetration of pure bitumen. The mechanical tests showed that augmenting the percentage of Nano reduced graphene oxide leads to increased indirect tensile strength, pull-off adhesion resistance, accumulated strain, reduced creep stiffness, and improved moisture sensitivity in stone mastic asphalt mixture. In general, 0.6% of this nanomaterial caused more significant changes in the mechanical properties of SMA mixtures than other amounts of Nano-reduced graphene oxide. So that adding 0.6% of this additive in the asphalt mixture has increased the TSR index by 23%, increased the pull-off adhesion resistance in the wet condition by 48%, and reduced the creep stiffness by 43% compared to the control mixture.

کلیدواژه‌ها [English]

Nano reduced graphene oxide؛
stone mastic asphalt؛ static creep؛ moisture susceptibility؛ Pull-off adhesion strength

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