بررسی آزمایشگاهی عملکرد بلندمدت مخلوط‌های آسفالتی گرم حاوی سرباره فولاد و تراشه آسفالتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

2 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

3 مربی، گروه مهندسی عمران، واحد ملارد، دانشگاه آزاد اسلامی، ملارد، تهران، ایران

4 استادیار، دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجائی، تهران، ایران

چکیده

بازیافت سرباره فولاد در مخلوط­های آسفالتی عملکرد آنها را بهبود می­بخشد ولی افزایش مصرف قیر در اثر این بازیافت کاربرد گسترده آنها را با مانع مواجه کرده است. برای رفع این مانع در این تحقیق اثر بازیافت همزمان سرباره فولاد و تراشه آسفالتی در مخلوط­های آسفالتی گرم مورد ارزیابی قرار گرفته است. بدین منظور شش مخلوط آسفالتی با دو درصد مختلف از درشت­دانه سرباره فولاد (0 و 40%) و سه درصد مختلف از ریزدانه تراشه آسفالتی (0، 20 و 40%) در دو حالت پیرشده کوتاه و بلند مدت ساخته شد و مقاومت آنها در برابر شیارشدگی، ترک خوردگی و آسیب­های رطوبتی اندازه­گیری شده و به شکل آماری با هم مقایسه شدند. نتایج نشان داد که افزودن سرباره فولاد و تراشه آسفالتی به شکل چشمگیری مقاومت در برابر شیارشدگی و ترک خوردگی را افزایش می­دهد. با این حال افزودن تراشه آسفالتی و سرباره فولاد به ترتیب منجر به کاهش و افزایش شکل­پذیری مخلوط­های آسفالتی در آزمایش کشش غیر مستقیم شدند. از طرف دیگر در حالی که افزودن تراشه آسفالتی حساسیت رطوبتی مخلوط­ها را کاهش داد، افزودن سرباره فولاد این حساسیت را تشدید کرد. در مجموع ثابت شد که مخلوط­هایی که همزمان هر دو این مصالح در آنها بازیافت شده است، نه تنها به لحاظ اقتصادی و زیست محیطی بسیار مطلوب ارزیابی می­شوند بلکه عملکردی قابل قبول و در برخی جهات بهتری از مخلوط­های کنترل و یا مخلوط­هایی که تنها یکی از دو این مصالح را دربردارند از خود نشان می­دهند.
 

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of Long-Term Behavior of Warm Mix Asphalt Containing Steel Slag Aggregates and Reclaimed Asphalt Pavement

نویسندگان [English]

  • A. Ahmadi 1
  • M. Fakhri 2
  • A. Ameli 3
  • M. Adresi 4
1 Ph.D. Student, Department of Civil Engineering, K.N. Toosi University, Tehran, Iran.
2 Associate prof., Department of Civil Engineering, K.N. Toosi University, Tehran, Iran
3 Instructor, Department of civil Engineering, Malard branch, Islamic Azad University, Malard, Tehran, Iran
4 Assistant Prof., Department of civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran.
چکیده [English]

Recycling Steel slag aggregates into the asphalt mixes improves their performance; however, increasing the bitumen consumption as a result of this recycling bridle its wide spread application. To overcome this difficulty, this research investigates feasibility of concurrent recycling of reclaimed asphalt pavement (RAP) and steel slag into the warm mix asphalt. To this end, six types of asphalt mixture with two coarse steel slag aggregate percentages (0 and 40%) and three RAP contents (0, 20, and 40%) were prepared in two states of aging (short- and long term) and their resistance  against rutting, cracking, and moisture-induced damages were examined and compared statistically. Results showed that incorporation of steel slag aggregates and RAP enhances the rutting and cracking performance of mixes; however, the former reduces and the latter one increases the moisture susceptibility. On the other hand, inclusion of RAP and steel slag in mixes respectively degrades and promotes the deformation of asphalt mix at the failure in indirect tension test. Overall, it is proven that simultaneous recycling of steel slag and RAP into the WMA not only is beneficial from economic and environmental perspective, but also leads to a mix which performs better or at least comparable to the conventional mixes and also the mixes that are made with one of these waste materials.
 
 

کلیدواژه‌ها [English]

  • Warm Mix Asphalt
  • RAP
  • steel slag
  • Marshall Quotient
  • Indirect Tensile Strength
  • Moisture susceptibility
  • aging

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