خصوصیات سختی و خستگی مخلوط آسفالتی اصلاح‌شده با ضایعات بطری‌های پلاستیکی (PET)

خصوصیات سختی و خستگی مخلوط آسفالتی اصلاح‌شده با ضایعات بطری‌های پلاستیکی (PET)

نوع مقاله : علمی - پژوهشی

چکیده

در این تحقیق، خصوصیات سختی و خستگی مخلوط آسفالتی اصلاح‌شده با ضایعات بطری‌های پلاستیکی (PET) مورد ارزیابی قرار گرفته است. مقادیر مختلف PET (2 تا 10 درصد نسبت به وزن قیر) به مخلوط آسفالتی با روش خشک اضافه شده و آزمایش‌های مدول برجهندگی و خستگی در دماهای 5 و20 درجه سانتیگراد انجام شد. نتایج نشان دادند که مقادیر کم PET (تا 2 درصد نسبت به وزن قیر)، باعث افزایش سختی مخلوط آسفالتی شده و روند نتایج از آن به بعد، نزولی می‌شود. همچنین در دمای کم که مخلوط آسفالتی تمایل به سخت شدن دارد، افزودن PET باعث کاهش سختی آن می‌شود. مقادیر بالای PET ( به خصوص 8 و10 درصد) عمر خستگی مخلوط آسفالتی را بیشتر افزایش می‌دهد. رابطه بین عمر خستگی و کرنش اولیه نشان می‌دهد که در شرایط بارگذاری سنگین خرابی خستگی در دماهای کم تا متوسط بحرانی‌تر می‌شود.ولی در شرایط بارگذاری سبک و سطح کرنش کمتر از محدوده 210-160 میکرو، خرابی خستگی در دمای کم بحرانی نخواهد بود.

کلیدواژه‌ها

20.1001.1.20086598.1393.5.4.8.6

عنوان مقاله [English]

Stiffness and Fatigue Properties of Modified Asphalt Mixes with Waste Plastic Bottles (PET)

چکیده [English]

In this study, the stiffness and fatigue properties of asphalt concrete mixtures, modified by waste plastic bottles (PET) have been evaluated. Different amounts of PET (2% up to 10% by weight of bitumen) was added by dry process to the mix and the resilient modulus and fatigue tests at 5 and 20 °C were performed. The results showed that low amount of PET (up to 2% by weight of the bitumen) increases the stiffness and results are then descending. It also tends to harden the asphalt mixture at low temperature, the addition of PET to reduce its hardness. At high amount of PET (especially 8% and 10%), fatigue life of mixtures increased more and the relationship between fatigue life and initial strain shows that at high loading conditions, fatigue failure will be more critical, at low to moderate temperatures. On the contrary, at lower loading conditions where the strain values are less than about 160–210 microstrain, the fatigue failure is not critical at low temperatures.

کلیدواژه‌ها [English]

waste plastic bottles (PET)
stiffness
modified hot mix asphalt
Fatigue life

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