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ارزیابی مشخصههای مخلوطهای آسفالتی گرم اصلاح شده با نانوگرافن | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 9، دوره 54، شماره 9، آذر 1401، صفحه 3391-3410 اصل مقاله (2.09 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2022.20719.7514 | ||
| نویسندگان | ||
| کیومرث قلندری شمامی؛ میثم عفتی* ؛ سید محمد میرعبدالعظیمی | ||
| دانشکده فنی، دانشگاه گیلان، گیلان، ایران | ||
| چکیده | ||
| یکی از روشهای مورد استفاده در زمینه بهبود خواص مخلوطهای آسفالتی، استفاده از مواد افزودنی به مخلوطهای آسفالتی است. از افزودنیهای مورد استفاده که در سالهای اخیر بسیار مورد توجه قرار گرفتهاند میتوان به مواد نانو اشاره کرد که به دلیل ویژگیهای منحصر به فردی که دارند بسیار مورد استقبال قرار گرفتهاند. در این پژوهش به بررسی اثر نانوگرافن بر مشخصات عملکردی مخلوطهای آسفالتی گرم پرداخته شده است. به این منظور قیر در درصدهای 0/1، 0/3 و 0/5 درصد وزنی قیر، اصلاح و با انجام آزمایشهای درجه نفوذ، نقطه نرمی و رئومتر برش دینامیکی، مقدار نانوگرافن 0/5 درصد انتخاب شد. سپس به منظور بررسی مشخصات عملکردی مخلوطها آزمایشهای بار محوری مکرر، مدول برجهندگی، خستگی به روش کشش غیرمستقیم انجام گرفت. همچنین به منظور بررسی حساسیت رطوبتی مخلوطها آزمایشهای کشش غیرمستقیم بر روی نمونهها در دو حالت خشک و مرطوب صورت گرفت. نتایج نشان از کاهش تغییر شکل نهایی، افزایش مدول برجهندگی در دماهای 5، 25 و 40 به ترتیب به مقدار 15، 36 و 54 درصد بود. همچنین در برخی از نمونهها عمر خستگی مخلوطهای آسفالتی اصلاح شده در برابر مخلوطهای متداول تا 55 درصد بهبود یافت. افزایش شاخص TSR در آزمایش کشش غیرمستقیم نشان از بهبود عملکرد نمونههای اصلاح شده نسبت به نمونههای متداول و کاهش حساسیت آنها در برابر رطوبت بود تا جایی که مقاومت کششی غیرمستقیم نمونههای اصلاح شده در حالت خشک و مرطوب نسبت به نمونههای متداول به ترتیب حدود 23 درصد و 38 درصد افزایش داشته است. | ||
| کلیدواژهها | ||
| مخلوط آسفالتی گرم؛ شیار شدگی؛ خستگی؛ حساسیت رطوبتی؛ نانوگرافن | ||
| موضوعات | ||
| راه و ترابری و حمل و نقل - روسازی انعطاف پذیر | ||
| عنوان مقاله [English] | ||
| Evaluation of properties of hot mix asphalt modified with nano-graphene | ||
| نویسندگان [English] | ||
| Kiumars Ghalandari Shamami؛ meysam Effati؛ seyed mohammad mirabdolazimi | ||
| Civil engineering, road and transportation, graduatrd pavment | ||
| چکیده [English] | ||
| One of the methods to improve the properties of asphalt mixtures is using additives. One of the additives that have received much attention in recent years is nanomaterials, which have been very popular due to their unique characteristics. In this study, the effects of nanographene on the performance characteristics of hot asphalt mixtures have been investigated. For this purpose, bitumen was modified in 0.1%, 0.3%, and 0.5% (by weight of bitumen), and by performing bitumen tests, the amount of nanographene selected was 0.5%. Then, to evaluate the performance characteristics of the mixtures, repeated axial load tests (RLA), indirect tensile strength modulus (ITSM), and indirect tensile fatigue test (ITF) were performed. Besides, to evaluate the moisture sensitivity of the mixtures, indirect and compressive tensile tests were performed on the samples in both dry and wet conditions. The results showed a decrease in the final deformation an increase in stiffness at 5, 25, and 40 by 15, 36, and 54%, respectively. Also, in some samples, the fatigue life of modified asphalt mixtures was improved by up to 55% compared to conventional mixtures. Increasing the TSR index in the indirect tensile test indicates an improvement in the performance of the modified sample compared to conventional samples and a decrease in their sensitivity against moisture, to the extent that the indirect tensile strength of the modified sample in dry and wet conditions compared to conventional samples Increased by 23% and 38% respectively. | ||
| کلیدواژهها [English] | ||
| Nano-Graphene, Hot Mix Asphalt, Rutting, ITS, Moisture Sensitivity | ||
| مراجع | ||
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