ارزیابی آزمایشگاهی عملکرد دمای پایین قیر و مخلوط اسفالتی حاوی گیلسونایت، پودر لاستیک و افزودنی نیمه گرم

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشگاه علم و فناوری مازندران، بهشهر، ایران

2 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران (مدیر عامل شرکت مهندسین مشاور آرا طرح رویان، تهران، ایران)

چکیده

هدف از مطالعه حاضر بررسی اثر افزودنی آسفالت نیمه گرم بر عملکرد ترک­های دمای پایین قیر و مخلوط آسفالتی با استخوان بندی سنگدانه ای حاوی پودر لاستیک و گیلسونایت می­باشد. در تحقیق حاضر، گیلسونیت، پودرلاستیک و 2 افزودنی نیمه­ گرم (3٪ Sasobit و همچنین 0.3٪ Zycotherm) برای اصلاح قیر خالص (AC-85/100) استفاده شد. آزمایش رئولوژیکی رئومتر تیرچه خمشی قیر و آزمایش عملکردی نیم­دایره خمشی مخلوط انجام شد. نتایج آزمایش رفتار رئولوژیکی نشان داد که عملکرد قیرهای آسفالتی در دماهای پایین با افزودن گیلسونیت بدتر می‌شود، در حالی که استفاده از پودر لاستیک باعث بهبود عملکرد دماهای پایین می‌شود. نتایج آزمایش نشان داد که استفاده از گیلسونیت منجر­به کاهش انرژی شکست و ضریب شدت تنش می­شود. در حالی که افزودن خرده لاستیک منجر به افزایش آنها شد. بر اساس نتایج، افزودن افزودنی‌های نیمه گرم منجر به افزایش انرژی شکست و کاهش سختی در دماهای پایین شد.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Evaluation of Low Temperature Performance of Asphalt Binder and Mixture Containing Gilsonite, Crumb Rubber, and Warm Mix Asphalt Additives

نویسندگان [English]

  • Rezvan Babagoli 1
  • Mohammad Kashani Novin 2
1 Assistant professor, Department of Civil Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran
2 Ph.D., Student, Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran. (Chief Executive Officer of Ara Tarh Royan Company, Tehran, Iran).
چکیده [English]

The aim of this study was to investigate the effect of warm mix asphalt additive on the low-temperature performance of bitumen and asphalt mixtures containing rubber powder and gilsonite. In the present study, gilsonite, rubber powder and 2 warm mix additives
(3% Sasobit and also 0.3% Zycotherm) were used to modify pure bitumen (AC-85/100). Several bitumen rheological tests and mixed functional tests were performed. The results of rheological behavior test showed that the performance of asphalt bitumen’s at low temperatures deteriorated with the addition of gilsonite, while the use of rubber powder improved the performance of low temperatures. The test results showed that the use of gilsonite leads to decrease the fracture energy and stress intensity factor. While, addition of crumb rubber led to increase them. Based on results, addition of warm mix additives led to increase the fracture energy and decrease the stiffness at low temperatures.

کلیدواژه‌ها [English]

  • Bitumen
  • Crumb Rubber
  • Asphalt Mixture
  • Bitumen Rheology
  • Low Temperature Cracking
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