بررسی آزمایشگاهی تاثیر افزودن الیاف فولادی بر مشخصات مکانیکی بتن غلتکی

نوع مقاله : مقاله پژوهشی

نویسندگان

• رامین چالشی ¹
• بابک گلچین ²
• رامین مشک آبادی ³

¹ گروه مهندسی عمران، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران

² گروه مهندسی عمران، دانشگاه محقق اردبیلی، اردبیل، ایران

³ دانشکده فناوری های نوین، دانشگاه محقق اردبیلی، اردبیل، ایران

10.22067/jfcei.2024.79344.1186

چکیده

بتن غلتکی به دلیل سرعت اجرا، هزینه نسبتاً پایین، عدم استفاده از میلگرد، مقاومت و دوام کافی در ساخت بسیاری از پروژه‌های عمرانی مانند روسازی راه‌ها، محوطه‌های پارکینگ، سدسازی، کف‌سازی محوطه‌های صنعتی مورد توجه قرار گرفته‌است. رفتار ترد و شکننده بتن غلتکی این ایده و فکر را ایجاد می‌کند که الیاف فولادی شاید بتوانند رفتار مکانیکی آن را بهبود دهند. در این پژوهش، اثر الیاف فولادی بر مقاومت شکست، مقاومت فشاری و مقاومت کششی بتن غلتکی بررسی شد. در آزمایش مقاومت شکست، از نمونه‌های نیم دایره‌ای با ترک لبه‌ای و تحت بارگذاری خمش سه نقطه‌ای برای شبیه‌سازی وضعیت کشش خالص، برش خالص و ترکیب آن‌ها استفاده گردید. مقاومت فشاری و کششی 7 و 28 روزه نمونه‌های بتن غلتکی در حضور الیاف فولادی نیز ارزیابی شد. نتایج آزمایشگاهی نشان داد که افزودن الیاف فولادی به مقدار 1/0، 3/0 و 5/0 درصد، مقاومت فشاری 28 روزه این نمونه‌ها را به ترتیب 12، 15 و 36 بهبود می‌دهد. این افزایش برای مقاومت کششی نمونه‌ها به ترتیب 14، 21 و 39 درصد است. با افزایش درصد الیاف فولادی، بار شکست تمام نمونه‌ها در تمام مودهای بارگذاری افزایش می‌یابد. افزایش بار شکست موجب مقاومت بیشتر در برابر رشد ترک می‌شود. مناسب‌ترین مقدار الیاف فولادی برای بهبود مقاومت شکست بتن غلتکی به مقدار 3/0 درصد کل وزن نمونه بتنی در مودهای مختلف بارگذاری شناسایی شد. این عدد برای مقاومت فشاری و کششی نمونه‌ها به مقدار 5/0 درصد است.

کلیدواژه‌ها

• بتن غلتکی
• الیاف فولادی
• استحکام
• مقاومت شکست

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عنوان مقاله [English]

Experimental Evaluating the Effect of Steel Fibers on the Mechanical Properties of Roller-compacted Concrete

نویسندگان [English]

• Ramin Chaleshi ¹
• Babak Golchin ²
• Ramin Meshkabadi ³

¹ Department of Civil Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran

² Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

³ Department of Engineering Sciences, Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Namin, Iran

چکیده [English]

The use of roller-compacted concrete in construction projects, such as road paving, parking lots, dam construction, and industrial pavement, is attributed to its quick implementation, relatively low cost, and sufficient strength without the need for steel bar. However, the brittle nature of roller-compacted concrete prompted an investigation into how steel fibers could improve its mechanical behavior. This research focused on the effect of steel fibers on fracture strength, compressive strength, and tensile strength of roller-compacted concrete. The study involved testing semicircular samples with edge cracks under three-point bending loading to simulate pure tension, pure shear, and their combination. Additionally, the compressive and tensile strength of roller-compacted concrete samples with steel fibers were evaluated at 7 and 28 days. The laboratory results showed that adding 0.1%, 0.3%, and 0.5% steel fibers improved the 28-day compressive strength by 12%, 15%, and 36%, respectively, and the tensile strength by 14%, 21%, and 39%, respectively. Moreover, the failure load of all samples increased in all loading modes with higher percentages of steel fibers, leading to greater resistance to crack growth. The study identified 0.3% of steel fibers as the most effective amount for improving the fracture resistance of roller-compacted concrete in different loading modes, while the optimal percentage for enhancing the compressive and tensile strength was determined to be 0.5%.

کلیدواژه‌ها [English]

• Roller-compacted Concrete
• Steel Fibers
• Strength
• Fracture Toughness

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