مقایسه تاثیر فیلر پسماند زغالسنگ با فیلرهای پوزولانی بر ویژگی‌های مکانیکی مخلوط آسفالت گرم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

2 دانشجوی کارشناسی ارشد، دانشکده عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

با توجه به محدود بودن منابع طبیعی و توسعه ساخت و ساز راه­ها، تقاضا برای استفاده از مصالح پسماند و بازیافتی افزایش یافته‌است. پسماند زغالسنگ یک محصول جانبی از کارخانه زغال‌شویی می­باشد که انباشت آن مشکلات فراوان زیست محیطی و اقتصادی را ایجاد کرده است. هدف از این تحقیق مقایسه استفاده از پودر پسماند زغالسنگ و خاکستر آن به عنوان فیلر در مخلوط آسفالتی گرم با سایر فیلرهای پوزولانی متداول می­باشد. در بخش اول این تحقیق پسماند زغالسنگ به صورت کامل جایگزین فیلر معدنی رایج پودر سنگ آهک شده و با فیلرهای پوزولانی مانند سیمان و زئولیت مورد مقایسه قرار گرفت. ویژگی­های مکانیکی مورد بررسی شامل مقاومت مارشال، نسبت مارشال­، روانی، مقاومت کششی و حساسیت رطوبتی
می­باشند. در بخش دوم تحقیق برای ارزیابی بیشتر علاوه بر ویژگی­های مکانیکی ذکر شده، مدول برجهندگی و خستگی پسماند زغالسنگ و خاکستر آن نیز مورد مقایسه و ارزیابی قرار گرفته شد. نتایج آزمایش­ها در بخش اول نشان داد، استفاده از فیلر پسماند زغالسنگ باعث بهبود ویژگی­های مکانیکی ذکر شده نسبت به پودر سنگ و زئولیت شده است. همچنین در بخش دوم اگرچه خاکستر زغالسنگ نتایج بهتری نسبت به حالت خام آن داشته ولی بعلت پروسه سخت، هزینه بالا و آلودگی ناشی از سوزاندن، استفاده زغالسنگ در حالت خام به عنوان فیلر در مخلوط آسفالتی گرم توصیه می­شود.
 
 

کلیدواژه‌ها

عنوان مقاله [English]

Comparing the Effects of Coal Waste Filler and Pozzolanic Fillers on the Mechanical Properties of Hot Mix Asphalt

نویسندگان [English]

  • A Modares 1
  • M Rahmanzadeh 2
1
2
چکیده [English]

Due to the limitation of natural resources and road construction developments, the demand for using waste and recycled materials has significantly increased. Coal waste is a by-product of the coal washing plant and its accumulation leads to different environmental and economic complications. The main objective of the current paper is to compare using coal waste powder and ash as filler in hot mix asphalt with other usual pozzolanic fillers. In the first section of this study coal waste completely replaces the usual fillers with lime stone powder and is compared with the pozzolanic fillers such as cement and zeolite. Mechanical properties studied here include Marshall Stability, Marshall Quotient, flow, tensile strength and moisture sensitivity. In the second section in order to better explore the subject, besides the above-mentioned mechanical properties, the resilient modulus and the fatigue of samples containing coal waste and ash a reanalyzed. The test results from the first section show that using coal waste filler improves the mentioned mechanical properties compared to lime stone powder and zeolite. Moreover, in the second section while coal ash has a better result compared to the raw state but due to difficult procedure, high cost and the pollution resulted from burning, using raw coal waste as filler in hot mix asphalt is recommended.
 
 
 
 

کلیدواژه‌ها [English]

  • coal waste
  • Hot Mix Asphalt
  • Filler
  • Pozzolan

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