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

مهندسی عمران فردوسی

مقاله 4، دوره 33، شماره 1 - شماره پیاپی 29، خرداد 1399، صفحه 49-66   

نوع مقاله: پژوهشی

شناسه دیجیتال (DOI): 10.22067/civil.v1i33.83141

نویسندگان

داریوش معظمی؛ علی صحاف^* ؛ ابوالفضل محمدزاده مقدم

گروه مهندسی عمران ، دانشکدۀ مهندسی دانشگاه فردوسی مشهد.

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

سایر فایل های مرتبط با مقاله

4-Sahaf - Revised.pdf

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