رفتار مخلوط آسفالتی ترک خورده تحت بارگذاری موجی شکل با استفاده از آزمایش خمش نیم دایره (SCB)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسیی ارشد، گروه راه و ترابری، دانشگاه آزاد اسلامی واحد علوم وتحقیقات، تهران، ایران

2 استادیار، گروه راه و ترابری، دانشگاه آزاد اسلامی واحد علوم وتحقیقات، تهران، ایران

چکیده

هدف از این مطالعه بررسی رفتار مقاطع آسفالتی ترک­خورده با استفاده از مقاطع آزمون خمش نیم دایره می­باشد. بدین منظور جهت انطباق شرایط آزمایش با شرایط واقعی، از بارگذاری نیم­سینوسی تکرار­شونده دارای دو مدت بارگذاری متفاوت و دوره استراحت با نسبت یک در دمای ثابت 20 درجه سانتی­گراد استفاده گردید. نمونه‌های آسفالتی مورد استفاده در این آزمایش در دو دانه­بندی متفاوت با حداکثر اندازه اسمی سنگدانه 5/12 و 25 میلیمتر می­باشند. جهت انجام بررسی­ها میزان تغییرمکان قائم و بازشدگی ترک در هر سیکل بارگذاری ثبت و در دو مرحله بارگذاری مورد بررسی قرار گرفت. نتایج نشان داد که در هر دو مرحله بارگذاری، تاثیر حداکثر قطر سنگدانه ها بر تغییرمکان قائم و بازشدگی ترک وابسته به مدت زمان بارگذاری (سرعت بار عبوری)­می باشد. در مدت بارگذاری کوتاه تر و مرحله اول بارگذاری، مخلوط با سنگدانه به قطر کوچکتر و در مرحله دوم بارگذاری مخلوط با قطر سنگدانه بزرگتر مقاومت بهتری از خود در برابر تغییر مکان قایم نمایش دادند. همچنین در هر دو مرحله بارگذاری، گسترش ترک سریع­تر از تغییرمکان قائم می باشدکه می تواند بیانگر رشد سریعتر ترک خوردگی خستگی نسبت به شیارشدگی در مقاطع ترک خورده باشد.
 
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Notched Asphalt Mixture Behavior under Waveform Loading Using Semi-Circular Bending Test (SCB)

نویسندگان [English]

  • M. Fadaei 1
  • A. Sarkar 2
1 Master of Science Student, Department of Road and Transportation, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assistant Professor, Department of Road and Transportation, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The purpose of this study is to investigate the behavior of notched asphalt sections by using semicircular bending test. To do this, in order to adapt the test conditions to real conditions, a Haversine loading with two different loading duration and a rest period with a ratio of one at a constant temperature of 20°C was used. Asphalt specimens used in this experiment are in two different grading with a nominal maximum aggregate size of 12.5 mm and 25 mm. In order to carry out the investigations, the vertical displacement and crack opening in each loading cycle were recorded and analyzed in two stages of loading. The results showed that in both loading stages, the effect of the maximum diameter of the aggregates on the vertical displacements and the crack opening depended on the loading duration (speed). In the shorter loading duration and the first loading stages, the mixture with the smaller aggregate diameters and, in the second loading stages, the mixture with larger aggregate diameters, exhibited a better resistance to the rutting. In both stages of loading, crack propagation is faster than vertical displacement, which can indicate a faster growth of fatigue cracking than rutting in notched sections.
 
 

کلیدواژه‌ها [English]

  • Semi Circular Bending Test
  • Waveform Loading
  • Notched Specimens
  • Fracture Mechanic

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