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بررسی تغییرات شیمیایی قیر پیرشده بر اثر افزودن مقادیر بهینهسازی شده جوانسازها با توجه به قطبیت جوانسازها | ||
| مهندسی زیر ساخت های حمل و نقل | ||
| مقاله 1، دوره 11، شماره 1 - شماره پیاپی 41، فروردین 1404، صفحه 1-20 اصل مقاله (2.37 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jtie.2025.35346.1692 | ||
| نویسندگان | ||
| منصور فخری* 1؛ علیرضا علوی2؛ مرتضی قنبری2 | ||
| 1استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران. | ||
| 2دانشکده عمران دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران. | ||
| تاریخ دریافت: 12 مهر 1403، تاریخ بازنگری: 18 اسفند 1403، تاریخ پذیرش: 16 فروردین 1404 | ||
| چکیده | ||
| مکانیزیم پیرشدگی قیر یکی از مشکلاتی است که در قیر به وجود میآید و باعث سختشدگی و اکسیداسیون قیر میشود. یکی از روشهای جلوگیری از پیرشدگی، استفاده از جوانسازهای مختلف در قیر است. از طرف دیگر، محاسبه میزان دقیق مواد افزودنی در قیر یکی از چالشهای موجود شناخته میشد چرا که در مطالعات گذشته، درصد مناسب مواد افزودنی عمدتاً بر اساس مقادیر نفوذ و نقطه نرمی تعیین میشد که هیچگونه مشخصه قیر و جوانساز را در نظر نمیگیرد و همچنین دقت کافی برای استفاده در قیر را ندارد. در مطالعه پیش رو، سه جوانساز مختلف شامل روغن ضایعات پختوپز (WCO)، روغن ضایعات موتور خودرو (WEO) و روغن آروماتیک استفاده شده است تا علاوه بر بازیابی بخشی از خواص از دست رفته قیر، برخی از نگرانیهای محیطزیستی موجود مبنی بر دفع روغن ضایعات موتور خودرو و روغن ضایعات پختوپز را حل کند. همچنین، برای محاسبه دقیق مقادیر جوانسازها با بهرهگیری از مقادیر جزء قطبی آزمایش انرژی آزاد سطحی (SFE)، شاخص نفوذپذیری و درجه نفوذ قیر، نتایج متفاوتی حاصل شد. برای محاسبه مقادیر بهینه جوانسازها از روش سطح پاسخ (RSM) استفاده شد. پس از مشخص شدن مقادیر بهینه، نمونههای بهینهسازی شده ساخته و با استفاده از طیفسنج فروسرخ تبدیل فوریه (FTIR) بررسی شدند. در این مرحله، با محاسبه چهار شاخص مهم و حیاتی برای قیر، میزان تأثیر قطبیت جوانسازها بر قیر مشخص شد. روغن آروماتیک حدود ۶۰ درصد شاخص کربونیل و ۶۷ درصد شاخص سولفوکسید را کاهش داد و بیشترین تأثیر را در بهبود شاخصهای ذکر شده ایجاد کرد. روغن ضایعات پختوپز با افزایش ۱۱۴ درصدی بیشترین افزایش نسبت مالتین به آسفالتین و با ۶۸ درصد بیشترین کاهش در نسبت اکسیداسیون را داشت، در حالی که روغن ضایعات موتور خودرو با ۷۴ درصد افزایش نسبت مالتین به آسفالتین و ۵۵ درصد کاهش اکسیداسیون کمترین تأثیر را نشان داد. نتایج موجود نشاندهنده تأثیر زیاد پارامتر قطبیت بر اصلاح خواص قیر است. لذا باید تأثیرات قطبیت جوانسازهای موجود پیش از استفاده آنها در قیر مورد بررسی قرار بگیرد. | ||
| کلیدواژهها | ||
| اکسیداسیون؛ نسبت مالتین به آسفالتین؛ شاخص سولفوکسید؛ شاخص کربونیل؛ روش سطح پاسخ؛ طیفسنج فروسرخ تبدیل فوریه | ||
| عنوان مقاله [English] | ||
| Investigation of the Chemical Effects of Polarity-Optimized Rejuvenators on Aged Binders | ||
| نویسندگان [English] | ||
| Mansour Fakhri1؛ Alireza Alavi2؛ Morteza Ghanbari2 | ||
| 1Professor, Department of Road and Transportation, Faculty of Civil Engineering, K. N. Toosi University, Tehran, I. R. Iran. | ||
| 2Faculty of Civil Engineering, K. N. Toosi University, Tehran, I. R. Iran. | ||
| چکیده [English] | ||
| The aging mechanism of asphalt binder is one of the most important challenges in pavement structures, which causes hardening and oxidation of the binder. Although the incorporation of rejuvenators is the well-known method to mitigate this problem, finding optimal dosage of rejuvenators is an important challenge. Previous studies mainly determined the suitable dosages of rejuvenators based on penetration grade and softening point values, without paying attention to the chemical characteristics of the binder and rejuvenators. In this study, three different rejuvenators including waste cooking oil (WCO), waste engine oil (WEO), and aromatic extract oil were used. This approach aimed to restore the aged binder's properties and address the existing environmental concerns regarding the disposal of waste oils. The polar components of surface free energy (SFE) were evaluated alongside penetration index and penetration grade values to calculate the accurate dosages of these rejuvenators. The optimal dosages were also determined by employing the response surface methodology (RSM). After identifying the optimal dosages, the resulting samples were analyzed by using Fourier-transform infrared spectroscopy (FTIR). At this stage, four chemical indices were used to measure the influence of polarity of rejuvenators on binder. The results showed that aromatic extract oil could reduce the carbonyl index by about 60% and the sulfoxide index by 67%, as the most effective rejuvenator for decreasing these indices. Waste cooking oil showed the highest performance for modifying maltene-to-asphaltene parameters and oxidation, for increasing the maltene-to-asphaltene ratio by 114% and reducing the oxidation ratio by 68%. In contrast, waste engine oil, as the least effective rejuvenator, increased the maltene-to-asphaltene ratio by 74% and reduced oxidation by 55%. These results revealed that optimization based on rejuvenator polarities has significant effects on resorting the binder characteristics. | ||
| کلیدواژهها [English] | ||
| Oxidation, Maltene-to-asphaltene -ratio, Sulfoxide index, Carbonyl index, RSM, FTIR | ||
| مراجع | ||
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