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.

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