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بررسی تأثیر استفاده از نانوکامپوزیت پلی یورتانی بر اصلاح خواص قیر | ||
| مهندسی زیر ساخت های حمل و نقل | ||
| مقاله 3، دوره 10، شماره 1 - شماره پیاپی 37، خرداد 1403، صفحه 39-61 اصل مقاله (3.01 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jtie.2024.33303.1665 | ||
| نویسندگان | ||
| سیدرضا سجادی1؛ غلامعلی شفابخش* 2؛ حسن دیواندری3 | ||
| 1دانشجوی دکتری راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان | ||
| 2استاد، گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران | ||
| 3استادیار، گروه عمران، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران | ||
| تاریخ دریافت: 26 آذر 1402، تاریخ بازنگری: 10 بهمن 1402، تاریخ پذیرش: 10 اسفند 1402 | ||
| چکیده | ||
| قیر به عنوان یکی از اجزای تشکیل دهنده آسفالت، نقش مهمی در خواص و عملکرد آسفالت و همچنین عمر و پایداری آن دارد. اما ساختار آن به دلیل خواص مکانیکی نامطلوب، پایداری حرارتی محدود و عدم مقاومت در برابر ترکخوردگی تحت شرایط محیطی نیاز به اصلاح دارد. در این تحقیق، با هدف افزایش استحکام و انعطافپذیری، بهبود خصوصیات عملکردی و حرارتی، افزایش چسبندگی و جلوگیری از جدایی فازی اصلاحکننده و قیر از پلییورتان منتهی به گروه عاملی ایزوسیانات حاوی نانولولههای کربنی استفاده شد. به این منظور، ابتدا پیشپلیمر یورتانی منتهی به گروه عاملی ایزوسیانات تهیه شده و سپس نانولولههای کربنی به میزان 5/0، 0/1 و 5/1 درصد وزنی به آن اضافه شد. بر اساس آزمون تنش کششی و آنالیز گرماوزنسنجی، نمونه حاوی 5/1 درصد نانوذره به عنوان نانوکامپوزیت بهینه انتخاب شده و در ادامه با مقادیر 2، 4، 6 و 8 درصد قیر ترکیب شد. آزمون FTIR ایجاد پیوندهای شیمیایی بین نانوکامپوزیت و قیر را تأیید کرد. جهت بررسی خواص و عملکرد نمونههای حاصل، آنالیز مورفولوژی، آزمون ویسکومتری (RV)، آزمون رئومتر برش دینامیک (DSR) و همچنین آزمایش خزش و بازگشت در چند سطح تنش(MSCR) انجام شد. نتایج حاصل از این آزمونها نشان داد که حضور نانوکامپوزیت در ساختار قیر باعث افزایش الاستیسیته و بههم پیوستگی ساختار قیر شده و اثرات منفی ناشی از افزایش تنش و دما در خواص قیر را کاهش میدهد و نانوکامپوزیت تهیه شده در این پژوهش میتواند به عنوان گزینه ای مناسب جهت بهبود عملکرد قیر در دمای زیاد و متوسط به کار رود. | ||
| کلیدواژهها | ||
| پلییورتان؛ پلییورتان منتهی به گروه عاملی ایزوسیانات؛ نانولولههای کربنی؛ اصلاح خواص قیر | ||
| عنوان مقاله [English] | ||
| Investigating the Effect of Using Polyurethane Nanocomposites on Modification of Bitumen Properties | ||
| نویسندگان [English] | ||
| Seyed Reza Sajadi1؛ Gholam Ali Shafabakhsh2؛ Hassan Divandari3 | ||
| 1PhD Candidate of Raod and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I.R. Iran | ||
| 2Professor, Department of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran. | ||
| 3Assistant Professor, Department of Civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran, I. R. Iran. | ||
| چکیده [English] | ||
| Bitumen, as one of the constituent elements of asphalt, plays an important role in the properties and performance of asphalt as well as its longevity and stability. However, its structure requires modification due to low mechanical properties, limited thermal stability, and susceptibility to cracking under environmental conditions. In this study, in order to increase the strength and flexibility, improving functional and thermal properties, enhance adhesion, and prevent phase separation, a modifier based on NCO-terminated polyurethane/CNT were used. For this purpose, NCO-terminated polyurethane pre-polymer was prepared, and then CNTs were added to it at 0.5%, 1%, and 1.5% wt.%. Based on tensile and TGA tests, the sample containing 1.5% nanoparticles was selected as the optimum nanocomposite and subsequently combined with bitumen and then it was mixed with bitumen at 2, 4, 6 and 8 percent. FTIR test confirmed the chemical bonds between the nanocomposite and bitumen. To investigate the properties and performance of the resulting samples, morphological analysis, viscometry (RV) test, and rheological (DSR) tests for fatigue resistance and rutting under environmental conditions were performed. Also, results of multiple stress creep-recovery (MSCR) test was compared with results of rheology analysis and it was shown that the presence of nanocomposite in the structure of bitumen increased the elasticity and cohesion of the modified bitumen structure. It reduces the negative effects caused by the increase in stress and temperature in bitumen properties and the nanocomposite prepared in this research can be used as a suitable option to improve bitumen performance at high and medium temperatures. | ||
| کلیدواژهها [English] | ||
| Polyurethane, NCO-terminated polyurethane, CNT, Modification of bitumen | ||
| مراجع | ||
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