بررسی تاثیر استفاده از پلیمر ضایعاتی پلی اتیلن ترافثالات (PET) در بتن آسفالتی بازیافتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی عمران، دانشگاه زنجان، ایران

2 دانشیار، گروه مهندسی عمران، دانشگاه زنجان، ایران

چکیده

این تحقیق با هدف بررسی خصوصیات بتن آسفالتی حاوی خرده آسفالت بازیافتی (RAP) و پلیمر ضایعاتی PET انجام شد. درصدهای مختلفی از PET به میزان 0، 3، 6 و 9 درصد بر اساس وزن قیر مخلوط کنترل در یک اندازه مشخص (18/1-425/0 میلی‏متر) به مخلوط‌های آسفالتی حاوی 0، 10، 20 و 30 درصد خرده آسفالت بازیافتی افزوده‌ شد و خصوصیات استقامت و روانی مارشال، خزش دینامیکی (جهت بررسی شیارشدگی)، مقاومت کششی غیرمستقیم، خستگی در تنش ثابت و آسیب رطوبتی مخلوط‌ها مورد ارزیابی و مقایسه قرار گرفت. نتایج نشان داد که استفاده از RAP باعث بهبود خصوصیات مکانیکی مخلوط‏ های آسفالتی از جمله استقامت مارشال، مقاومت به شیارشدگی، مقاومت کششی غیرمستقیم و خستگی می ‏شود. علاوه بر این، حساسیت رطوبتی مخلوط ‏های حاوی RAP نسبت به مخلوط کنترل کمتر است و در مخلوط ‏های حاوی مقادیر یکسان PET، استفاده از 20 درصد RAP بیشترین مقدار TSR را نشان می­ دهد. همچنین، نتایج نشان داد که PET ضایعاتی باعث کاهش مقاومت مارشال و مقاومت به شیارشدگی و خستگی مخلوط ‏های آسفالتی می‏ شود. علاوه بر این، بر اساس نتایج بدست آمده در مخلوط‏ هایی با مقادیر یکسان RAP، استفاده از PET تا 6 درصد وزن قیر باعث بهبود مقاومت کششی غیرمستقیم و مقاومت در برابر رطوبت مخلوط ‏ها نسبت به مخلوط کنترل شده است. در نهایت، نتایج این تحقیق نشان داد که استفاده همزمان RAP و PET باعث بهبود مشخصات مکانیکی مخلوط ‏ها نسبت به مخلوط کنترل می‏ شود و با افزایش مقدار RAP، امکان استفاده از مقادیر بیشتر PET نیز فراهم می‏ شود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating the Effects of Using Waste Poly Ethylene Thrathalate (PET) in Recycled Asphalt Concrete

نویسندگان [English]

  • saeed zamani 1
  • Hasan Taherkhani 2
1 Master student, Civil Engineering Department University of Zanjan, Zanjan, Iran
2 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran
چکیده [English]

This study aimed to investigate the properties of asphalt concrete containing reclaimed asphalt pavement (RAP) and waste polyethylene Teraphthalate (PET). Different dosages of PET including 0, 3, 6 and 9% (by the weight of total binder of control mix) were added to asphalt concrete containing 0, 10, 20 and 30% of RAP and the properties including Marshall stability and flow, indirect tensile strength (ITS), moisture damage resistance, dynamic creep and constant stress fatigue resistance have been evaluated. Results reveal that RAP inclusion improves Marshall Stability, resistance against permanent deformation, tensile strength and fatigue resistance. In addition, moisture sensitivity of asphalt mixture containing RAP is less than the control mix, and, for the mixtures containing the same PET content, inclusion of 20% RAP results in the highest tensile strength ratio (TSR). Results also show that PET results in decrease of Marshall Stability, permanent deformation and fatigue resistance. Moreover, in the mixtures containing the same RAP content, ITS and TSR of the mixtures containing 0 to 6% of PET are higher than those of the control mixture. From the results in this study it can be inferred that using RAP and PET simultaneously can result in better properties than the control mixture and using RAP allows using higher PET content without scarifying the properties.

کلیدواژه‌ها [English]

  • Asphalt concrete
  • Reclaimed asphalt pavement (RAP)
  • Waste PET
  • Dynamic creep
  • Moisture damage
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