استفاده از الیاف فولادی موج دار جهت بررسی خواص رئولوژی، پارامترهای مکانیکی و شکست بتن خود متراکم با حجم درشت دانه متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران.

2 دانشیار گروه مهندسی عمران، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان وبلوچستان، زاهدان، ایران

3 استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه ولایت، ایرانشهر، ایران.

10.22124/jcr.2023.22425.1583

چکیده

با توجه به مقاومت پایین بتن در برابر ترک خوردگی و حجم قابل توجه سنگ دانه مصرفی در این ماده، در تحقیق حاضر به بررسی تاثیر افزایش حجم الیاف فولادی موج دار(0.15% ، 0.3% و 0.45% ) و حجم درشت دانه ها به کل سنگدانه ها (30% ، 40% ، 50% و 60% ) بر مشخصات بتن خودمتراکم تازه ، سخت شده و همچنین مکانیک شکست پرداخته شده است. در این راستا آزمایشات جریان اسلامپ، جعبه L و حلقه Jدر بخش بتن تازه، آزمایشات مقاومت فشاری، کششی و مدول الاستیسیته در بخش بتن سخت شده و همچنین چقرمگی شکست مود اول در بخش مکانیک شکست بر روی 108 نمونه استوانه ای انجام گردید. نتایج نشان داد که افزایش حجم درشت دانه، سبب بهبود خواص رئولوژی و افزایش حجم الیاف فولادی موج دار باعث کاهش کارایی و روانی بتن خودمتراکم خواهد شد. از طرفی افزایش حجم الیاف فولادی موج دار سبب بهبود مقاومت فشاری در بتن های حاوی حجم 50 و 60 درصد درشت دانه خواهد شد. تنها در بتن های حاوی 60 درصد درشت دانه، افزایش حجم الیاف منجر به افت ناچیز در مقاومت کششی بتن های خودتراکم مسلح الیافی خواهد شد. افزایش حجم درشت دانه( 30 % - 60% )پارامتر مدول الاستیسیته نمونه های حاوی درصد ثابت الیاف را بهبود می بخشد. همچنین با افزایش حجم الیاف فولادی موج دار در 30% و 40% حجم درشت دانه، مقدار چقرمگی شکست برای مود اول نمونه های بتن خودتراکم حاوی الیاف فولادی موج دار افزایش می یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Using Wavy Steel Fibers to Study the Rheological Properties, Mechanical and Fracture Parameters of Self-Compacting Concretes with Different Coarse Aggregate Volumes

نویسندگان [English]

  • seyed omid hoseini 1
  • Mohammad Reza Sohrabi 2
  • Seyed Roohollah Mousavi 2
  • Mohamad Ghasemi 3
1 Civil Engineering Department, Shahid Nikbakht Faculty of Engineering University of Sistan and Baluchestan, Zahedan, Iran
2 Civil Engineering Department, Shahid Nikbakht Faculty of Engineering University of Sistan and Baluchestan, Zahedan, Iran.
3 Civil Engineering Department, Faculty of Engineering, Velayat University, Iranshahr, Iran.
چکیده [English]

Considering the low concrete resistance to cracking and high volume of aggregate used in it, this study has addressed the effects of increasing the volume of wavy steel fibers (0.15, 0.3 and 0.45%) and volume of coarse aggregates (30, 40, 50 and 60%) in relation to the total volume of aggregates on the properties of fresh, hardened self-compacting concrete as well as on the fracture mechanics. To this end, different tests were performed on: 1) fresh concrete (slump-flow, T-50, J-Ring, Sieve analysis and L-BOX tests), 2) hardened concrete (compressive strength, tensile strength and modulus of elasticity tests) and 3) fracture mechanics (Mode I fracture toughness test on ENDB specimens) using 108 cylindrical specimens. Results showed that increasing the coarse aggregate volume improves the rheological properties and increasing the wavy steel fiber volume reduces the efficiency and flowability of the self-compacting concrete, but improves the compressive strength in concretes containing 50 and 60% coarse aggregate volume. Increasing this volume, will slightly reduce the tensile strength of only the fiber reinforced self-compacting concretes containing 60% coarse aggregates. Increasing the coarse aggregate volume by 30 to 60% improves the modulus of elasticity of specimens containing a fixed fiber percent and increasing the volume of wavy steel fibers, at 30 and 40% coarse aggregate volumes, increases the fracture toughness (Mode I) of the self-compacting concrete specimens containing wavy steel fibers.

کلیدواژه‌ها [English]

  • Self-compacting concrete
  • wavy steel fibers
  • coarse aggregate volume
  • fracture toughness
  • mechanical parameters

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