ارزیابی تاثیر پیر شدگی بر روی خواص بتن آسفالتی بازیافتی حاوی جوانساز روغن موتور ضایعاتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه عمران، دانشگاه زنجان، زنجان، ایران

2 دانش آموخته کارشناسی ارشد، مهندسی راه و ترابری، دانشگاه زنجان، زنجان، ایران

چکیده

در این تحقیق، با جایگزینی بخش درشت دانه یک بتن آسفالتی با خرده آسفالت ضایعاتی و افزودن درصدهای مختلف وزنی شامل 0، 4، 7 و 10% (بر حسب وزن کل قیر مخلوط) از روغن موتور ضایعاتی به آن برای جوانسازی قیر پیر شده خرده آسفالت، ویژگی های مختلف آن شامل خصوصیات حجمی، استقامت مارشال، روانی، مقاومت کششی و مقاومت خزشی بعد از اعمال پیر شدگی کوتاه مدت و بلند مدت مورد ارزیابی قرار گرفته و با حالت بدون پیر شدگی مورد مقایسه قرار گرفته اند نتایج نشان می دهند که استقامت مارشال، مقاومت کششی و مقاومت خزشی مخلوطها با افزودن خرده آسفالت ضایعاتی افزایش و با افزایش روغن ضایعاتی کاهش می یابد. در مخلوطهای پیر نشده، استقامت مارشال و نسبت مارشال با افزودن روغن تا 7% افزایش و سپس کاهش می یابند، اما، مقاومت کششی و خزشی با افزایش روغن کاهش می یابند. همچنین، پیر شدگی باعث افزایش استقامت مارشال، نسبت مارشال، مقاومت کششی و مقاومت خزشی و کاهش روانی می گردد. میزان تاثیر پیرشدگی بر خصوصیات آسفالت بازیافتی با نوع پیر شدگی و مقدار روغن تغییر می کند. تاثیر پیر شدگی بر افزایش نسبت مارشال تا 7% روغن افزایش و سپس کاهش می یابد. تاثیر پیر شدگی بر مقاومت کششی با افزایش روغن کاهش می یابد، اما، تاثیر بر افزایش مقاومت خزشی با افزایش مقدار روغن افزایش می یابد. تاثیر پیر شدگی بر افزایش مقاومت کششی بیشتر از آن بر استقامت مارشال می باشد. تاثیر پیرشدگی بلند مدت بر استقامت مارشال و مقاومت کششی مخلوطهای بازیافتی کمتر از مخلوط کنترل می باشد و میزان تاثیر با افزایش روغن کاهش می یابد. همچنین، نتایج بیانگر این است که تاثیر پیرشدگی بر مقاومت خزشی بیشتر از آن بر مقاومت کششی و خصوصیات مارشال می باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effects of ageing on the properties of recycled asphalt concrete containing waste engine oil as rejuvenator

نویسندگان [English]

  • Hasan Taherkhani 1
  • Javad Najafi 2
1 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
2 M.Sc., Grad., Civil Engineering Department, University of Zanjan, Zanjan, Iran.
چکیده [English]

In this study the effects of short and long term ageing on some of engineering properties of recycled asphalt concrete containing high percentage of reclaimed asphalt pavement (RAP) and rejuvenated by different dosages of waste engine oil (WEO) have been investigated. The coarse fraction of asphalt concrete has been replaced with RAP and the mixture has been rejuvenated by different dosages, namely 0, 4, 7 and 10% (by the weight of total binder) of WEO, and the volumetric and Marshall properties, indirect tensile strength (ITS) and creep properties of the mixtures after experiencing different ageing conditions including un-aged, short term and long term ageing have been evaluated. Results reveal that inclusion of RAP into mixture increases the optimum binder content, Marshall stability and quotient, ITS and creep resistance; the Marshall stability and quotient, optimum binder content, ITS and creep resistance decreases with increasing WEO content. In un-aged condition, Marshall stability and quotient increase up to 7% of WEO content, beyond which the trend reverses. Also, ageing results in increase of Marshall stability, ITS and creep resistance, and decrease of flow with more effect after long term ageing. The degree of ageing effect on the properties depends on the type of ageing, type of mixture and amount of rejuvenator. The effect of ageing on Marshall quotient increases up to 7% of WEO content, beyond which decreases. For ITS the effect of ageing decreases with increase of WEO content, and for creep resistance, the effect of ageing increases with increase of WEO content. The Marshall stability and ITS are more affected by ageing in recycled mixtures than in control mixture and the level effect decreases with increase of WEO. Furthermore, results reveal that creep resistance is more affected from ageing than the ITS and Marshall properties. .

کلیدواژه‌ها [English]

  • Ageing
  • Creep resistance
  • Indirect tensile strength
  • Recycled asphalt concrete
  • Waste engine oil

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