بررسی خصوصیات مکانیکی و ضربه‌ای بتن‌های کامپوزیتی توانمند خودتراکم

نوع مقاله : پژوهشی

نویسندگان

دانشگاه لرستان

چکیده

کامپوزیت‌های بتنی توانمند خودتراکم الیافی (HPFRSCC) مصالح توانمند و شکل‌پذیری هستند که از ترکیب ملاط سیمان و الیاف تشکیل می‌شوند. در این تحقیق خصوصیات مکانیکی و ضربه‌ای این کامپوزیت‌های بتنی به‌صورت تجربی بررسی‌شده است. بر روی نمونه‌ها آزمایش‌های متنوعی مانند آزمایش‌های مربوط به بتن خودتراکم تازه، آزمایش‌های مقاومت فشاری، کششی و خمشی، آزمایش اولتراسونیک و آزمایش مقاومت ضربه‌ای انجام شد. نتایج این آزمایش‌ها نشان داد الیاف فولادی می‌تواند بر روی خاصیت خودتراکمی و پیوستگی بتن تأثیر منفی و در بهبود خصوصیات مکانیکی و مقاومت ضربه‌ای بتن تأثیر مثبت داشته باشد که تأثیر آن در بهبود مقاومت ضربه‌ای بسیار قابل‌توجه‌تر است. در این تحقیق همچنین اثر دو پارامتر افزایش ضخامت دال و افزودن الیاف فولادی در افزایش مقاومت ضربه‌ای دال‌ها بررسی و باهم مقایسه شد، نتیجه این بررسی نشان داد که الیاف فولادی پارامتر بسیار مهم‌تری در افزایش مقاومت ضربه‌ای دال‌ها است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Mechanical and Impact Properties of High Performance Self-Compacting Composite Concrete

نویسندگان [English]

  • Amirhosein Sahraei Moghadam
  • Ahmad Dalvand
Lorestan university
چکیده [English]

High performance self-compacting fiber reinforced composite concrete (HPFRSCC) are mighty and mighty materials that form a mixture of cement mortar and fiber. In this study, the mechanical and impact properties of these composite concrete have been empirically investigated. Various experiments were carried out on the samples, such as self-compacting concrete tests, compressive, splitting tensile and flexural strength tests, ultrasonic test and impact resistance test. The results of these experiments showed that steel fibers can have a negative effect on the self-compacting and cohesion properties of concrete, and have a positive effect on improving mechanical properties and impact strength of concrete, which has a significantly higher effect on impact resistance. In this study, the effect of two parameters of increasing the thickness of the slab and adding steel fibers to increase the impact strength of the slabs were surveyed and compared. The result of this study showed that steel fiber is a much more important parameter in increasing the impact strength of slabs.

کلیدواژه‌ها [English]

  • Composite concrete
  • High performance concrete
  • Self-compacting concrete
  • Steel fiber
  • Drop weight impact
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