ارزیابی آزمایشگاهی وتحلیل عددی اثر استفاده از باطله‌های معدنی سیلیمانیت به عنوان درشت‌دانه بر مقاومت لغزشی و سختی مخلوط آسفالتی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد راه و ترابری، دانشکده عمران، دانشگاه یزد.

2 دانشیار، دانشکده عمران، دانشگاه یزد.

3 استادیار، دانشکده عمران، دانشگاه یزد.

چکیده

سیلیمانیت یک ماده معدنی ارزان‌قیمت با ترکیباتی شامل اکسید آهن، سیلیسیم اکسید و آلومینیوم اکسید می‌باشد. استفاده از آهن، سیلیس و آلومینیوم در صنعت روسازی به‌عنوان مصالح سنگی درشت‌دانه تأثیر قابل‌ملاحظه‌ا‌ی بر عملکرد مخلوط‌های آسفالتی داشته است. در این تحقیق، اثر استفاده از مصالح سنگی سیلیمانیتی به‌عنوان جایگزین مصالح آهکی درشت‌دانه بر روی پارامتر‌های مدول برجهندگی، مقاومت مارشال و مقاومت لغزندگی در دماهای مختلف مورد بررسی قرار گرفت. در این مطالعه، مدل‌سازی با تکیه بر رفتار ویسکوالاستیک لایه‌ها و با استفاده از نرم‌افزار المان محدود انجام شد، تا تأثیر در تغییرات مدول الاستیسیته ناشی از تغییر جنس مصالح سنگی بر واکنش روسازی تعیین شود. نتایج نشان داد که استفاده از مصالح سنگی سیلیمانیتی در مخلوط آسفالتی، درصد قیر بهینه کمتری نسبت به مصالح آهکی دارد؛ و همچنین مقاومت مارشال مخلوط آسفالتی ساخته‌شده با مصالح سنگی سیلیمانیتی در درصد قیر بهینه 15% و مدول برجهندگی 25% نسبت به مخلوط آسفالتی ساخته شده با مصالح آهکی افزایش ‌داشته‌ است. استفاده از مصالح سیلیمانیتی در مخلوط آسفالتی به‌دلیل سختی زیاد نسبت به مصالح آهکی می‌تواند باعث افزایش مقاومت اصطکاکی رویه آسفالتی در برابر سایش ناشی از عبور بارهای ترافیکی شود. نتایج تحلیل عددی نشان می‌دهد که استفاده از سنگدانه سیلیمانیتی به‌عنوان درشت‌دانه تأثیر قابل‌ملاحظه‌ای بر کرنش کششی بحرانی زیر لایه رویه ندارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Laboratory Evaluation and Numerical Analy-sis Effect Use of Sillimanite Mineral Wastes as Course- Aggregate on Surface Sliding and Stiffness of Asphaltic Mixture

نویسندگان [English]

  • Hasan Mohammadi Anaie 1
  • Mohammad Mehdi Khabiri 2
  • Hamed Khani Sanij 3
  • Fatemah Matin Ghahfarrokhi 1
1 Highway and Transportation M.Sc. Student, Engineering Faculty, Yazd University.
2 Associated Professor, Engineering Faculty, Yazd University.
3 Assistance Professor, Engineering Faculty, Yazd University.
چکیده [English]

Overburdens are stones that lack the required properties of minerals to be extracted and are piled adjacent to mine, while they may be used as aggregates in the asphalt mixture. Set-tlement is a cheap mineral composed of iron oxide, silicone and aluminum oxide, application of iron, silica and aluminum as aggregates in pavement industry has great effect on per-formance of asphalt mixtures. In this study, we investigated the effect of using Sillimanite aggregate material as an alter-native for Limestone aggregates on resilient modulus, Mar-shall Strength and skid resistance parameters at various tem-peratures. The modeling was carried out by using finite ele-ment software based on the elastic behavior of the layers to determine the effect of elasticity modulus variations due to the change in aggregate type on the pavement response. The re-sults indicated that the use of Sillimanite aggregates in the asphalt mixture led to a lower optimum bitumen percent than Limestone material; and also, in the asphalt mixture made of Sillimanite aggregates with optimum bitumen percent, Mar-shall Strength was increased by 15% and the resilient modulus by 25% compared to the mixture with Limestone material. Application of Sillimanite material in the asphalt mixture could enhance the friction resistance of the mixture against the abrasion resulting from traffic loading due to its higher hardness compared to Limestone material. The results of nu-merical analysis showed that the aggregate’s type had the lowest effect on the critical tensile strain at the bottom of the asphalt layer, then came the percentage of bitumen in the mix-ture and, finally, the bonding of the layers had the highest ef-fect.

کلیدواژه‌ها [English]

  • Sillimanite Mineral Waste
  • skid resistance
  • Hot Asphalt Mixture
  • Resilient Modulus
  • Aggregate Materials
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