تعیین درصد الیاف فولادی بهینه از نظر خواص مکانیکی در بتن‌های معمولی و خودتراکم دارای الیاف فولادی

رحمنی, ایرج; ملکی, احمد; لطف اللهی یقین, محمدعلی

doi:10.22091/cer.2021.7157.1270

تعیین درصد الیاف فولادی بهینه از نظر خواص مکانیکی در بتن‌های معمولی و خودتراکم دارای الیاف فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه آزاد اسلامی واحد مراغه

² استادیار، دانشگاه آزاد اسلامی واحد مراغه.

³ استاد، دانشکده عمران، دانشگاه تبریز.

10.22091/cer.2021.7157.1270

چکیده

بتن مسلح با الیاف فولادی به منظور بهبود بخشیدن به خواص بتن، کاربرد وسیعی را در سازه‌های بتنی و بتن مسلح پیدا کرده است. دلیل این کاربرد گسترده، مزایای بیشمار فنی و اقتصادی در استفاده از الیاف فولادی در جسم بتن می‌باشد. بتن مسلح با الیاف فولادی شامل یک کالبد بتنی مرکب از سیمان، مصالح سنگی، آب و همچنین درصدی از الیاف فولادی کوتاه می‌باشد که به‌طور درهم و کاملا اتفاقی و در جهات مختلف در مخلوط پراکنده شده که وجود الیاف فولادی مشخصات بتن را نسبت به حالت خالص بهبود می‌بخشد. تعیین درصد بهینه الیاف یکی از فاکتورهای مهم از لحاظ اقتصادی و کارایی بتن است. در این پژوهش برای تعیین درصد الیاف بهینه در رده‌های مقاومتی مختلف 24 طرح اختلاط تهیه و آزمایشگاه مکانیکی و بتن تازه انجام شد. مقاومت خمشی آزمونه‌های حاوی 0.9 درصد الیاف فولادی برای رده‌های C40، C50 و C60 به ترتیب به مقدار 1.91، 3.86 و 5.14 برابر نسبت به آزمونه شاهد بیشتر شده است. از بین آزمونه‌های بتنی خودمتراکم مسلح به الیاف فولادی، بهینه‌ترین طرح اختلاط متعلق به آزمونه‌ای است که در آن از 9/0 درصد الیاف فولادی استفاده شده است؛ به‌طوری که مقاومت فشاری متناظر با آن برابر 71.19 مگاپاسکال شده است. از بین آزمونه‌های بتنی معمولی مسلح به الیاف فولادی، بهینه‌ترین طرح اختلاط متعلق به آزمونه‌ای است که در آن از 0.9 درصد الیاف فولادی استفاده شده است؛ به‌طوری که مقاومت فشاری متناظر با آن برابر 63.7 مگاپاسکال شده است.

کلیدواژه‌ها

موضوعات

روش‌های عددی و آزمایشگاهی

عنوان مقاله [English]

Determining the Percentage of Optimal Steel Fibers in Terms of Mechanical Properties in Ordinary Concrete and Self-Compaction with Steel Fibers

نویسندگان [English]

Iraj Rahmani ¹
Ahmad Maleki ²
Mohammadali Lotfolahieyaghin ³

¹ Islamic Azad University, Maragheh Branch

² Islamic Azad University, Maragheh Branch

³ Tabriz University

چکیده [English]

Reinforced concrete with steel fibers has been widely used in concrete and reinforced concrete structures to improve the properties of concrete. The reason for this widespread use is the myriad technical and economic advantages of using steel fibers in concrete bodies. Reinforced concrete with steel fibers includes a concrete body composed of cement, stone materials, water as well as a percentage of short steel fibers that are mixed in a completely randomly and in different directions in the mixture that the presence of steel fibers characterizes the concrete compared to pure Improves. Determining the optimal percentage of fibers is one of the important factors in terms of economics and efficiency of concrete. In this study, to determine the percentage of optimal fibers in different strength classes, 24 mixing designs were prepared and a mechanical laboratory and fresh concrete were performed. The flexural strength of samples containing 0.9% of steel fibers for categories C40, C50 and C60 was 1.91, 3.86 and 5.14 times higher than the control sample, respectively. Among the self-compacting concrete specimens reinforced with steel fibers, the most optimal mixing design belongs to the specimen in which 0.9% of steel fibers are used; So that the corresponding compressive strength is equal to 71.19 MPa. Among the typical concrete samples reinforced with steel fibers, the most optimal mixing design belongs to the sample in which 0.9% of steel fibers are used; The corresponding compressive strength is 63.7 MPa.

کلیدواژه‌ها [English]

steel fibers
mechanical properties
self-compacting concrete
compressive strength
optimum percentage

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