بررسی نتایج آزمایش خمش 4 نقطه‌ای تیرچه‌های مخلوط بتن غلتکی (RCC)حاوی خرده لاستیک و خرده آسفالت بازیافتی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران

2 گروه مدیریت ساخت، دانشکده مهندسی کاربردی، فناوری و ایمنی، دانشگاه میلرزویل، میلرزویل، پنسیلوانیا، ایالات متحده آمریکا

چکیده

 ترک­خوردگی ناشی از تنش کششی یکی از اساسی­ترین نوع خرابی در روسازی­های بتنی بشمار می­آید. در این مقاله اثر خصوصیات بتن غلتکی حاوی خرده لاستیک بازیافتی و خرده آسفالت بر روی رفتار شکست نمونه­ها در مودهای مختلف1 شکست مورد بررسی قرار گرفته است. مجموعه­ای شامل 288 نمونه تیرچه بتن غلتکی حاوی2 RAP یا خرده لاستیک تحت آزمایش خمش چهارنقطه­ای­(4PB)  قرار گرفتند. تاثیر دانه­بندی و درصد خرده لاستیک یا خرده آسفالت بازیافتی و سیمان بر ضریب شدت تنش نمونه­ها در مودهای Iو II مورد بررسی قرار گرفته است. نتایج ضریب شدت تنش نمونه­ها بیانگر این بود که ترکیب مخلوط بتن غلتکی تاثیر بسزایی بر رفتار شکست آن خواهد داشت. همچنین اگرچه، ترکیب مصالح بازیافتی باعث افزایش انعطاف پذیری و چقرمگی نمونه­ها می­گردد ولیکن اثر معکوسی در میزان ضریب شدت تنش شکست نمونه­ها و میزان تاب باربری آنها خواهد داشت.

کلیدواژه‌ها


عنوان مقاله [English]

The 4-Point Bending Test Results Analysis of Notched Roller Compacted Concrete (RCC) Mixture Beams Containing Reclaimed Asphalt Pavement and Crumb Rubber

نویسندگان [English]

  • A.R. Ameli 1
  • E. Parvaresh Karan 2
  • S.A.H. Hashemi 1
1 Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran.
2 Department of Applied Engineering, Safety, and Technology, Millersville University, Osburn Hall,
چکیده [English]

Tensile cracking is one of the main modes of deterioration and failure in rigid pavements. Hence, in this paper the effects of roller compacted concrete (RCC) characteristics on their fracture behavior in both pure mode I and II are experimentally investigated. A set of 288 edge cracked beam specimens endured the four-point bending (4PB) test and were tested for different concrete mixtures made with waste materials such as reclaimed asphalt pavement (RAP) and crumb rubber. The influence of aggregate gradation, cement content, RAP, and rubber content on the critical stress intensity factors in pure fracture mode I and II were studied. The fracture toughness results showed that concrete mix specifications had a noticeable influence on the cracking initiation of RCC and the effect of substituting of waste materials with natural aggregates was found to be negative, but their behavior was still comparable to those obtained for control mixes.

کلیدواژه‌ها [English]

  • RCC
  • Stress intensity factor
  • Reclaimed Asphalt Pavement
  • Recycle Crumb Rubber

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