بررسی تاثیر نوع و حداکثر اندازه سبکدانه بر خصوصیات شکست بتن سبک خودتراکم با استفاده از مدل تاثیر مرز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکدۀ فنی دانشگاه گیلان

2 گروه مهندسی عمران، دانشکده فنی دانشگاه گیلان، رشت، ایران

10.22124/jcr.2025.29008.1681

چکیده

تاثیر نوع و حداکثر اندازه سبک‌دانه مصرفی بر خصوصیات شکست بتن سبک خودتراکم مورد بررسی قرار گرفت. برای این منظور 9 مخلوط بتن سبک خودتراکم حاوی سبک‌دانه‌های اسکوریا و لیکا، در سه دسته‌‌بندی 100 درصد اسکوریا - 0 درصد لیکا، 50 درصد اسکوریا - 50 درصد لیکا و 0 درصد اسکوریا – 100 درصد لیکا و حداکثر اندازه سبک‏دانه 9.5، 12.5 و 19 میلیمتر تدارک دیده شد. خصوصیات شکست به روش تاثیر مرز و با استفاده از تیرهای مشابه هندسی با نسبت ثابت عمق شکاف به عمق تیر تعیین گردید. نتایج نشان داد که با افزایش حداکثر اندازه سبک‌دانه انرژی شکست به طور متوسط 6.6 درصد کاهش می‌یابد. همچنین چقرمگی شکست و مقاومت کششی حاصل از روش تاثیر مرز نیز با افزایش dmax بطور متوسط به ترتیب 3.8 و 7.3 درصد کاهش نشان دادند و طول ترک مرجع کمتر از 8 درصد افزایش نشان داد. با جایگزینی سبک‌دانه لیکا با اسکوریا، مقدار انرژی شکست، چقرمگی شکست و مقاومت کششی حاصل از روش تاثیر مرز به ترتیب به‌طور متوسط20.1 ، 19.1 و 36.9 درصد افزایش یافتند و طول ترک مرجع بطور متوسط 24.4 درصد کاهش نشان داد. تمام نمونه‌‌ها در محدوده مکانیک شکست غیر خطی قرار گرفتند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the influence of type and maximum size of lightweight aggregates on the fracture characteristics of lightweight self-compacting concrete by means of the boundary effect model

نویسندگان [English]

  • A. Sadrmomtazi 1
  • Hamed Pourahmadi Sefat Arabani 2
1 Professor, Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
2 Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
چکیده [English]

The influence of type and maximum size of lightweight aggregate on the fracture characteristics of lightweight self-compacting concrete (LWSCC) was investigated. For this purpose, nine mixtures of LWSCCs containing scoria and LECA were prepared in three classifications: 100% scoria - 0% LECA, 50% scoria - 50% LECA, and 0% scoria - 100% LECA, with maximum aggregate sizes of 9.5, 12.5, and 19 mm. Fracture characteristics were determined by means of the boundary effect method (BEM) using the geometrically similar notched beams with a constant notch-to-beam depth ratio. The results showed that the fracture energy decreased by an average of 6.6% with increasing maximum aggregate size. Moreover, the fracture toughness and tensile strength obtained from BEM also decreased by an average of 3.8% and 7.3%, respectively, with increasing dmax, while the reference crack length increased by less than 8%. By replacing LECA with scoria, the fracture energy, fracture toughness, and tensile strength obtained from BEM increased by an average of 20.1%, 19.1%, and 36.9%, respectively, and the reference crack length decreased by an average of 24.4%. All samples were in the nonlinear fracture mechanics region.

کلیدواژه‌ها [English]

  • Fracture mechanics
  • Lightweight self-compacting concrete
  • boundary effect method
  • Scoria
  • LECA

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