مقایسه تاثیر استفاده از پلیمر ضایعاتی پلی‌اتیلن ترافثالات PET)1) بر‌عملکرد بتن آسفالتی حاوی قیر اصلاح نشده و اصلاح شده با لاستیک ضایعاتی

نویسندگان

1 دانشیار، دانشکده فنی و مهندسی‌، دانشگاه زنجان، زنجان، ایران

2 دانش آموخته کارشناسی ارشد، دانشکده فنی و مهندسی‌، دانشگاه زنجان، زنجان، ایران

چکیده

در این تحقیق به منظور بررسی تأثیر پلیمر ضایعاتی PET بر عملکرد بتن آسفالتی حاوی قیر لاستیکی و قیر اصلاح نشده، ذرات PET  در مقادیر 2، 4، 6، 8 و 10 درصد (بر اساس وزن قیر) به مخلوط‌های آسفالتی افزوده شد. پس از تعیین مقدار قیر بهینه مربوط به 
ترکیب‌های مختلف، مخلوط‌های آسفالتی حاوی PET، تحت آزمایش‌های مارشال، کشش غیرمستقیم و خزش دینامیکی قرار گرفتند. آزمایش خزش دینامیکی با استفاده از دستگاه UTM-10، در سطح تنش 300 کیلوپاسگال و دمای 40 سانتی‌گراد، به منظور ارزیابی تغییر شکل ماندگار (شیار  افتادگی) مخلوط‌ها به کار گرفته شد. نتایج نشان داد که اضافه کردن PET به مخلوط‌های آسفالتی حاوی قیر لاستیکی باعث بهبود مقاومت مارشال و نسبت مارشال نسبت به نمونه شاهد شد، به‌طوری‌که بیشترین مقدار مقاومت و نسبت مارشال مربوط به نمونه‌های حاوی 10 درصد PET شد. اما، در مخلوط آسفالتی حاوی قیر اصلاح نشده ببشترین استقامت و نسبت مارشال با افزودن 4% PET حاصل می گردد.  همچنین، نتایج آزمایش کشش غیرمستقیم بر روی نمونه های حاوی درصد فضای بین 5/6 تا 5/7% نشان داد که بیشترین استقامت در هر دو مخلوط با افزودن 2% PET به دست می آید، اما، در مخلوط‌های حاوی درصد فضای خالی در محدوده 3 تا 5% مقاومت کششی با افزایش PET کاهش می یابد. نتایج آزمایش خزش دینامیکی نشان داد که مخلوط‌های آسفالتی گرم حاوی PET رفتار متفاوتی در برابر بارگذاری دینامیکی نسبت به استاتیکی دارند. افزودن PET به مخلوط‌های آسفالتی باعث کاهش مقاومت نسبت به تغییر شکل دائمی (شیار افتادگی) تحت بارگذاری دینامیکی شد، به‌طوری‌که با افزایش مقدار PET مقاومت نسبت به تغییر شکل دائمی کاهش یافت. اما، تاثیر PET بر مقاومت شیار شدگی مخلوط حاوی قیر لاستیکی کمتر از آن بر مخلوط حاوی قیر اصلاح نشده است.  
 

کلیدواژه‌ها


عنوان مقاله [English]

Comparing The Effect of Using Waste PET Polymer on The Performance of Asphalt Concrete Made of Unmodified and Rubber Modified Asphalt Binder

نویسندگان [English]

  • H. Taherkhani 1
  • M. R. Arshadi 2
1 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran
2 M.Sc. Grad., Civil Engineering Department University of Zanjan, Zanjan, Iran
چکیده [English]

In this research, in order to study the effect of using PET on the performance of asphalt concrete containing rubber modified and unmodified binder, PET particles were added into the mixtures in different dosages of 0, 2, 4, 6, 8 and 10% (by the weight of binder). After determination of the optimum binder content of the mixtures, the specimens were made and subjected to Marshall, indirect tensile and dynamic creep tests. The dynamic creep tests were performed using a universal testing machine (UTM-10) by applying a vertical stress of 300kPa at a temperature of 40°C, to investigate the resistance against permanent deformation. Results show that adding PET into the mixtures improves the Marshall stability and Marshall Quotient compared with those for the control mixture. However, the trend of variation with PET content is different for the unmodified and rubber modified mixtures. While the Marshall stability and Marshall quotient increase with increasing PET content in the rubber modified asphalt concrete, they reach to the highest value by adding 4% of PET into the unmodified mixture, and after that they decrease with increase of PET content. The indirect tensile test results show that the indirect tensile strength (ITS) of the mixtures made by rubber modified and unmodified binder and containing air voids content within 6.5 to 7.5%, reaches to its highest value by adding 2% of PET. However, for the mixtures containing air voids content within 3-5% ITS decreases with increasing PET content. Dynamic creep tests reveal that the resistance against permanent deformation decreases with increasing PET content in both mixtures, with a lower reduction in the mixtures made by rubber modified binder. Comparing the results of Marshall Quotient and dynamic creep tests show that the deformation behavior of PET modified mixtures is different under static and dynamic loading. While, the mixtures resistance against deformation under static loading is improved, under dynamic loading they show less resistance than the control mixtures. Also, results of this research show that PET is less effective on the rubber modified mixtures than the unmodified mixtures.
 
 

کلیدواژه‌ها [English]

  • Asphalt concrete
  • Waste PET
  • rubber asphalt
  • ITS
  • Dynamic Creep

4- Universal Testing Machine

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