بررسی عملکرد مبتنی بر شکست بتن ژئوپلیمری سنگین تقویت شده با الیاف فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی عمران، دانشگاه گیلان، رشت، ایران.

2 دانشجوی دکترای عمران، سازه، دانشگاه گیلان، رشت، ایران

10.22124/jcr.2024.26649.1647

چکیده

در مطالعه حاضر، خواص مکانیکی بتن ژئوپلیمری سنگین‌وزن تقویت‌شده با الیاف فولادی شامل مقاومت فشاری، مقاومت کششی مورد بررسی قرار گرفت. علاوه بر این، پارامترهای شکست مطابق روش کار شکست (WFM) روش اثر اندازه (SEM) نیز بررسی شد. در این تحقیق ابتدا نمونه‌ای حاوی سنگ‌دانه‌های طبیعی فاقد الیاف مورد آزمایش قرار گرفت. سپس یک نمونه که در آن سنگ‌دانه‌های سنگین مگنتیت که از معدن آهن چاه کوه استان یزد تهیه شده است، به‌عنوان جایگزین کامل برای سنگ‌دانه‌های طبیعی مورد بررسی قرار گرفت. سپس به همین نمونه در کسرهای حجمی 5/0، 75/0، 1، 25/1 و 5/1 درصد حجمی الیاف فولادی اضافه شده و اثرات آن بررسی شد. نتایج به‌دست‌آمده از آزمایش‌ها نشان داد که افزودن الیاف فولادی با هر کسر حجمی منجر به افزایش مقاومت‌های فشاری و کششی غیرمستقیم شده است. نتایج نشان داد که انرژی شکست (GF) حاصل از روش مکانیک شکست (WFM) در نمونه با الیاف فولادی با نسبت 5/1 درصد بیشتر از نمونه شاهد است. بااین‌حال افزایش درصد الیاف فولادی منجر به افزایش انرژی شکست شده است. بررسی مقادیر اندازه مؤثر منطقه فرآیند (Cf) نشان داد که در نمونه‌های با الیاف فولادی 5/0 و 75/0 درصد، مقدار آن کمتر از نمونه شاهد و در نمونه‌های دیگر بیشتر از نمونه شاهد به دست آمده است. بااین‌وجود افزایش درصد الیاف فولادی به‌طور پیوسته منجر به افزایش Cf شده است. نسبت انرژی شکست دو روش G_F/G_f برای طرح‌های مختلف در این تحقیق بین 81/0 تا 14/1 به دست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the fracture-based performance of heavy weight geopolymer concrete reinforced with steel fibers

نویسندگان [English]

  • Seyed Hosein Ghasemzadeh Mousavinejad 1
  • Kamyar Faghihi 2
1 Engineering Faculty, Civil engineering Dept. , University of Guilan
2 Engineering Faculty, Civil engineering Dept. ,University of Guilan
چکیده [English]

In the present study, the mechanical properties of heavy weight geopolymer concrete reinforced with steel fibers including compressive and splitting tensile strength were investigated. In addition, fracture parameters were also investigated according to WF and SE methods. In this research, first, a sample containing natural aggregates without fibers was tested. Then, an example in which heavy recycled aggregates were considered as a complete substitute for natural aggregates. Then, steel fibers were added to the same sample in volume fractions of 0.5, 0.75, 1, 1.25 and 1.5% and its effects were investigated. The results obtained from the tests showed that the addition of steel fibers with any volume fraction led to an increase in indirect compressive and tensile strengths. The results showed that the fracture energy (GF) obtained by the fracture mechanics method (WFM) in the sample with steel fibers with 1.5 percent is higher than the control sample. However, increasing the percentage of steel fibers has led to an increase in fracture energy. Examining Cf values showed that in samples with 0.5% and 0.75% steel fibers, its value is lower than the control sample and in other samples it is higher than the control sample. However, increasing the percentage of steel fibers has steadily led to an increase in Cf. The GF/Gf ratio for different designs in this research was between 0.81 and 1.14.

کلیدواژه‌ها [English]

  • Geopolymer concrete
  • fracture characteristics
  • steel fibers

مراجع

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