بررسی خصوصیات دوامی مخلوط های اساسی تثبیت‌شده با سیمان حاوی تراشه آسفالت در سیکل های تر و خشک شدن

نوع مقاله : یادداشت پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران

2 گروه مهندسی عمران، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران

3 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران

چکیده

در حال حاضر استفاده از مصالح تراشه آسفالتی به­ عنوان مصالحی ارزشمند در ساخت روسازی­ های آسفالتی جدید و یا استفاده از آن‌ها در لایه­ های مختلف روسازی مانند لایه اساس به­‌منظور کاهش هزینه­ های ساخت و همچنین کنترل آلودگی محیط‌زیست مورد توجه است. از طرفی مهم‌ترین مواردی که اکثر محققین حاضر به آن توجه دارند، دوام این­ گونه روسازی­ ها است. اهمیت این موضوع از آنجایی نشئت می‌گیرد که روسازی بادوام منجر به کاهش هزینه‌های ترمیم و نگهداری و در کل کاهش نسبت مخارج روسازی می‌شود. هدف از این مقاله بررسی معیارهای مختلف دوام مخلوط­ های تثبیت‌شده اساس با سیمان حاوی مقادیر مختلف تراشه آسفالت است. در این راستا نمونه­ های مقاومت فشاری و کششی غیرمستقیم در درصدهای مختلف وزنی تراشه آسفالت شامل 0%، 40%، 60% و 80% و در درصدهای مختلف وزنی سیمان شامل 3%، 5% و 7% ساخته شد. سپس مقاومت فشاری محدود نشده 7 و 28 روزه، مقاومت کششی غیرمستقیم 7 روزه و آزمایش تر و خشک شدن بر روی آن­ها انجام شد و بر اساس معیارهای مختلف دوامی مانند نسبت مقاومت کششی غیرمستقیم مرطوب به خشک، TSR (Tensile Strength Ratio)، حداکثر مقاومت فشاری به­ منظور کنترل صلبیت لایه تثبیت‌شده، درصد افت وزنی نمونه­ های تثبیت‌شده، درصد تغییرات حجمی نمونه و درصد تغییرات مقاومت فشاری بعد از 12 سیکل تر و خشک شدن نمونه ­ها، سعی شد تا درصد بهینه تراشه آسفالت تعیین گردد. بر این اساس اضافه شدن مقدار پیشنهادی 40 تا 60 درصد تراشه آسفالت به مخلوط اساس تثبیت‌شده با سیمان برای تغییر رفتار لایه تثبیت‌شده از صلب به انعطاف­ پذیر و بهبود عملکرد دوامی این­گونه مخلوط­ ها توصیه می ­شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Durability Properties of Cement Stabilized Base Mixtures Contains Different Amounts of RAP during Wet and Dry Cycles

نویسندگان [English]

  • Mostafa Adresi 1
  • Mostafa Vamegh 2
  • Mehdi Ebrahimzadeh Shiraz 3
1 Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
2 Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
3 Faculty of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

One of the issues that has been considered in the construction and improvement of pavements in recent decades is the use of recycled materials in the pavements. In this regards using RAPs is widely interested by many agencies and policy makers to recycle the waste materials and reuse of this valuable aggregated coating by bitumen. According to previous studies, the generally accepted criteria for the design of pavement structures containing a stabilized foundation are based on the allowable values and limits of unconfined compressive strength (UCS), and generally control according to durability criteria. The point to be noted here is the limited number of studies that examine the issue of durability and its impact on the mixing design and determining the optimal amount of RAPs. The purpose of this study is to investigate different durability criteria for cement-stabilized mixtures containing RAPs and to determine the optimal values of RAP and cement in terms of durability of such mixtures.

کلیدواژه‌ها [English]

  • RAP
  • Compressive strength
  • Indirect tensile strength
  • Durability
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