بررسی آزمایشگاهی استفاده از پلی اتیلن کراس لینک بازیافتی به عنوان سنگدانه در آسفالت متخلخل

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشیار گروه راه و ترابری، دانشکده عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 کارشناس‌ارشد راه و ترابری، دانشکده عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

3 دانشجوی دکتری، دانشکده عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

چکیده

پلی ­اتیلن کراس لینک (XLPE) نوعی عایق برای کابل ­های فشار قوی است که به دلیل مقاومت الکتریکی و حرارتی مطلوب، به طور گسترده در پوشش کابل­ های انتقال الکتریسیته استفاده می­ شود. به دلیل نبود تکنولوژی مناسب برای بازیافت XLPE، عمدتاً از روش­ های سوزاندن و دفن ­کردن برای ضایعات این مواد استفاده می ­گردد. در این پژوهش از ضایعات XLPE به عنوان جایگزین مصالح­ سنگی ریزدانه مخلوط ­های آسفالت متخلخل بهره گرفته ­شده است. به این منظور مقادیر 25، 50 و 75 درصد حجمی از مصالح ­سنگی 36/2 تا 75/4 میلیمتر با ذرات XLPE هم ­اندازه جایگزین گردیدند. جهت تخمین درصد قیر بهینه از آزمایش ­های کانتابرو و تعیین درصد فضا­های­ خالی مخلوط استفاده گردید. در گام بعد عملکرد نمونه ­ها از طریق آزمون ­های لاتمن اصلاح شده و کانتابرو بر روی نمونه ­های پیرشده و فرونشست قیر مورد ارزیابی واقع شد. بررسی ­ها نشان داد که ذرات XLPE، به علت قابلیت جذب پایین، می ­توانند توانایی مخلوط­ های آسفالت متخلخل را برای مقاومت در برابر شرایط رطوبتی افزایش دهند. همچنین ارزیابی نتایج آشکار نمود که نمونه­ های حاوی XLPE جایگزین­ شده با 25 درصد حجمی مصالح ­سنگی بین 36/2 تا 75/4 میلیمتر، بهترین عملکرد را نسبت به نمونه­ های شاهد و دیگر نمونه ­های حاوی XLPE دارا هستند.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Investigation of the Use of Recycled Cross-Linked Polyethylene as Aggregate in Porous Asphalt Mixture

نویسندگان [English]

  • Iman Aghayan 1
  • Iman Mohammadian Nameghi 2
  • Alireza Danande 2
  • Reza Behzadian 3
1 Associate Professor of Civil Engineering Department at Shahrood University of Technology, Shahrood, Iran
2 MSc, Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran
3 Ph.D. Student, Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran
چکیده [English]

Cross-Linked Polyethylene (XLPE) is a type of insulation for high-voltage cables that is widely used in electrical cable coatings because of its good thermal and electrical resistance properties. Due to lack of appropriate technology for XLPE recycling, incineration and burial methods are mainly used for the waste of these materials. In this study, XLPE wastes were used as a substitute for fine aggregates of porous asphalt mixtures. For this purpose, 25, 50 and 75% volumes of the 2.36 to 4.75 mm aggregates were replaced with the same size XLPE particles. Optimal asphalt percentage was estimated by the mixture’s air voids percentage and Cantabro tests. In the next step, the performance of the samples was evaluated by modified Lottman, Cantabro on aged samples and asphalt drain down tests. The results showed that XLPE particles, due to their low absorption capacity, can enhance the resistance of porous asphalt mixtures to moisture damage. The evaluations also revealed that specimens which 25% aggregates between 2.36 to 4.75 of them replaced with XLPE, had the best performance compared to control and other specimens containing XLPE.

کلیدواژه‌ها [English]

  • Cantabro test
  • Moisture susceptibility
  • Porous Asphalt
  • XLPE wastes
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