تحلیل تجربی استحکام شکست بتن غلتکی حاوی الیاف طبیعی جوت تحت مدهای مختلف بارگذاری

نوع مقاله : علمی - پژوهشی

نویسندگان
بابک گلچین 1
بهنام رمزی 2
رامین مشک آبادی 3
1 استادیار، گروه مهندسی عمران، دانشگاه محقق اردبیلی، اردبیل، ایران
2 کارشناس ارشد، گروه مهندسی عمران، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران
3 استادیار، گروه مهندسی نوین، دانشکده فناوری های نوین، دانشگاه محقق اردبیلی، اردبیل، ایران
10.22119/jte.2024.467728.2713
چکیده
در این پژوهش، استحکام شکست بتن غلتکی حاوی الیاف طبیعی تحت حالت‌های مختلف بارگذاری مورد بررسی قرار گرفته است. برای  این منظور و  ایجاد حالت‌های بارگذاری کشش خالص، برش خالص و ترکیب آن دو  از نمونه نیم دایره­ای با ترک لبه­ای استفاده شد. برای تعیین استحکام شکست نمونه‌ها از آزمایش خمش سه‌نقطه‌ای استفاده شد. از ضریب شدت تنش بحرانی به دست آمده از آزمایش شکست، و ضرایب شکل به دست آمده  از تجزیه‌وتحلیل المان محدود به‌عنوان معیارهای ارزیابی استفاده گردید. نتایج نشان داد که افزایش بار شکست ناشی از افزایش درصد الیاف طبیعی در نمونه‌ها منجر به این می‌شود که نمونه­های بتن غلتکی ترک‌دار با داشتن الیاف طبیعی نسبت به نمونه­هایی که فاقد الیاف طبیعی هستند در تمام حالت‌های بارگذاری مقاومت بیشتری در برابر رشد ترک نشان دهند. این تحقیق مقدار درصد الیاف طبیعی بهینه در مودهای مختلف بارگذاری با توجه به مقاومت شکست نمونه­ها را تعیین کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Experimental Analysis of Fracture Strength of Roller-Compacted Concrete Reinforced with Natural Jute Fibers under Different Loading Modes

نویسندگان English

Babak Golchin 1
Behnam Ramzi 2
Ramin Meshkabadi 3
1 Assistant Professor, Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 M.Sc., Department of Civil Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran
3 Assistant Professor, Department of Advanced Technologies, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده English

In this research, the fracture strength of roller-compacted concrete reinforced with natural fibers under different loading conditions has been investigated. For this purpose and creating loading modes of pure tension, pure shear and the combination of the two, a semi-circular sample with an edge crack was used. Three-point bending test was used to determine the fracture strength of the samples. The critical stress intensity coefficient obtained from the failure test, and the shape coefficients obtained from the finite element analysis were used as evaluation criteria. The results showed that the increase in the failure load due to the increase in the percentage of natural fibers in the samples leads to the fact that the cracked roller-compacted concrete samples with natural fibers are more resistant to crack growth than the samples without natural fibers in all loading modes. The optimal percentage of natural fibers in different loading modes according to the fracture resistance of the samples is 0.3% of the total weight of the roller-compacted concrete. 

کلیدواژه‌ها English

Concrete pavement
Natural fibers
Fracture toughness
Finite element method
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فصلنامه مهندسی حمل و نقل
دوره 16، شماره 4 - شماره پیاپی 65
تابستان 1404
صفحه 4935-4949

  • تاریخ دریافت 23 تیر 1403
  • تاریخ بازنگری 20 مرداد 1403
  • تاریخ پذیرش 23 مرداد 1403