ارزیابی رئولوژیکی قیر پلیمری حاوی نانورس در بازه پیوسته دمایی تحت اثر پیش اختلاط

نوع مقاله: مقاله پژوهشی

نویسنده

استادیار گروه عمران-راه و ترابری، دانشگاه پیام نور تهران شمال

چکیده

در فرآیند اصلاح قیر به کمک افزودنیها بویژه در هنگام افزودن نانومواد، گاهی شرایط تولید نمونه بسیار سخت و بعضا فقط در مقیاس آزمایشگاهی ممکن است. در این پژوهش سعی شد با اعمال تغییراتی در نحوه آماده سازی نمونه ها، شرایط فرآیندی تولید را آسانتر و در عین حال عملکرد نمونه ها را نیز بهبود بخشید. مطالعات نشان داده است، استفاده از پلیمرSBS (LG501) و نانورس (Cloisite-15A) خواص قیر را به نحو مطلوبی اصلاح کرده است. ساخت آمیخته ای از مواد افزودنی با استفاده از مخلوط کن داخلی، هدف اصلی این پژوهش در تسهیل اصلاح قیر است. چرا که اولا به آماده سازی نانورس و افزایش فاصله بین صفحات آن کمک می­کند و ثانیا مراحل و مدت زمان افزودن مواد مختلف به قیر در مخلوط کن برشی با دور بالا را کاهش می­دهد. با انجام این روش، نه تنها در ساخت نمونه بلکه در خواص رئولوژیکی و نحوه پخش مواد در قیر بهبود حاصل می­شود و حتی می­توان شرایط کاهش دور اختلاط را مهیا کرد. با استفاده از آزمایش های کلاسیک (درجه نفوذ، نقطه نرمی و شکل پذیری) و آزمایش­های انجام شده با استفاده از رئومتر برش دینامیکی، مانند تعیین رده عملکردی PG و آزمایش جاروب دما به بررسی و مقایسه خواص نمونه های اصلاح شده با روش های مختلف پرداخته شد. نتایج نشان داد استفاده از پیش اختلاط در مقایسه با روش عادی اختلاط، خواص قیر را بهبود بخشیده است. همچنین نتایج عملکردی مشابهی بین نمونه های حاوی پیش آمیخته با نمونه های اختلاط عادی در دور اختلاط کمتر مشاهده شد. کاهش دور اختلاط اثرات قابل توجهی بر بهبود پیرشدگی قیر داشت که برتری استفاده از روش پیش­اختلاط را نشان می­دهد. همچنین نمایش خواص اطمینان­بخش در بازه پیوسته دمایی در نمونه­های ساخته شده به روش پیش اختلاط مشهود بود. بطور کلی تغییر روش اصلاح قیر، اثر خود را هم بر کاهش پیرشدگی ناشی از فرآیند اختلاط و هم در تهیه مخلوط همگن­تر و دارای خواص بهبود یافته­ی اطمینان­بخش نشان داد.

کلیدواژه‌ها


عنوان مقاله [English]

Rheological Evaluation of Polymer Bitumen Containing Nano-Clay in a temperature continuous range affected by pre-mixing

نویسنده [English]

  • Shahin Shabaani
Assistant Professor, Department of Civil Engineering, Payame Noor University, Department of Center of North Tehran
چکیده [English]

Improving bitumen with additives such as nanomaterials will be difficult in adding the materials and mixing them occasionally both in laboratory and real scale. Therefore, in this research, we tried to improve the performance of the samples by making changes in the way of preparing the samples, while simplifying production process conditions. The hypothesis of this research is based on the principle that this method firstly helps prepare the Nano-clay and increase the distance between the plates, and secondly, reduces the steps and the time duration of adding different materials to bitumen. Also, it improves the rheological properties and the way in which the materials are dispersed in bitumen. In this research, 12 samples were considered that have been prepared by pre-mixing and conventional mixing methods, and the differences in their properties were investigated under different process conditions. Using classical experiments (degree of penetration, softness and ductility point) and performance based tests such as PG and temperature sweep, tested and compared the properties of the samples improved in different methods. The results showed that the use of premixing method compared to the conventional method has a greater effect on improvement of the properties of bitumen and achievement on the similar properties with the conventional method but in less mixing speed. The reduction of mixing speed, while affecting the improvement of bitumen aging, demonstrated the superiority of using the premixing method. In general, changing the method of bitumen improvement showed its effect on reducing aging caused by the mixing process and on preparing a more homogeneous mixture having more suitable function. It should be noted that the samples made by the premixing method showed a higher "behavior change temperature" (T75 °) than the conventional method.

کلیدواژه‌ها [English]

  • Rutting
  • Premix
  • Temperature sweep
  • Performance Grade
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