رفتار خزشی در مخلوط‌های آسفالتی سنگ‌دانه‌ای حاوی مصالح سنگی مصنوعی و ذرات پلاستیک ضایعاتی

نوع مقاله : پژوهشی

نویسندگان

• داریوش معظمی
• علی صحاف
• ابوالفضل محمدزاده مقدم

گروه مهندسی عمران ، دانشکدۀ مهندسی دانشگاه فردوسی مشهد.

10.22067/civil.v1i33.83141

چکیده

 امروزه از یکسو بهبود خواص مخلوط­های آسفالتی یک ضرورت است و از سوی دیگر انباشت سربارۀ کورۀ آهن­گدازی و بطری­های پلاستیکی مشکلات زیست­محیطی جدی ایجاد نموده است. در این مطالعه اثر این دو مادۀ ضایعاتی روی بهبود عملکرد خزشی مخلوط آسفالت سنگ‌دانه‌ای(Stone Mastic Asphalt-SMA) مورد بررسی قرار گرفت؛ به‌منظور بررسی اثر نمونه­هایی با 3، 5 و 7 درصد پلاستیک ضایعاتی (Polyethylene terephthalate -PET) در دو شکل ذرات و الیاف آماده گردید. نتایج آزمایش خزش نشان داد که کرنش ماندگار نهایی برای نمونه­های اصلاح­شده با 5 درصد الیاف PET کمترین مقدار و برای نمونه‌های اصلاح شده با 7 و 3 درصد الیاف PET در ردیف­های بعدی قرار دارند؛ به­علاوه اضافه کردن PET به شکل الیاف مؤثرتر است. با افزایش تنش و دما، اختلاف عملکرد خزشی بین نمونه­های اصلاح ­شده و اصلاح­ نشده بارزتر بود. نمونه­های حاوی سربارۀ اسلگ با 5 درصد الیاف PET (S-5P-F) به­اندازۀ 70 درصد خرابی کمتری را تجربه نمودند.

کلیدواژه‌ها

• عملکرد خزش
• مخلوط‌های آسفالتی اصلاح‌شده
• بطری‌های پلاستیکی
• مواد ضایعاتی
• سرباره

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عنوان مقاله [English]

Creep Behavior of SMA Mixtures with Slag and Polyethylene Terephthalate

نویسندگان [English]

• M moazami
• S Sahaf
• A moghadam

Department of Civil Engineering, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, Iran

چکیده [English]

Nowadays on the one hand improving the performance of asphalt mixtures is a necessity and on the other hand disposal of steel slag and plastic containers causes serious environmental problems. Therefore, in this study the effect of two waste materials on enhancing creep performance of Stone Mastic Asphalt (SMA) mixture was investigated; In order to thoroughly investigate the impact of Polyethylene terephthalate (PET) modification, specimens with three percentages of PET (3,5 and 7) in two forms (PET particles and PET fibers) were prepared. It was found that cumulative permanent strain was the lowest for specimens modified with 5 percent PET followed by 7 and 3 percent, respectively; Furthermore, adding PET in the form of fiber is more effective. With increase in stress and temperature, differences between creep performance of modified and unmodified samples were more prone. Based on average damage ratios, slag samples with 5 percent PET fiber (S-5P-F) were 70 percent less damaging.

کلیدواژه‌ها [English]

• Creep performance
• Modified asphalt mixture
• Polyethylene terephthalate (PET)
• Slag
• Waste materials
• Polyethylene terephthalate

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