بررسی آزمایشگاهی و عددی تاثیر PET و الیاف فولادی بر روی مقاومت خمشی و منحنی تنش-کرنش فشاری بتن های خودتراکم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد، واحد تبریز، تبریز، ایران

2 دانشیار، گروه مهندسی عمران، دانشگاه صنعتی سهند، تبریز، ایران

10.22124/jcr.2022.20346.1520

چکیده

هدف از پژوهش حاضر بررسی آزمایشگاهی و عددی تاثیر همزمان PET و الیاف فولادی بر روی خصوصیات رئولوژیکی بتن خودتراکم، مقاومت خمشی و منحنی تنش-کرنش فشاری بتن خودتراکم می‌باشد. بدین منظور 30 طرح اختلاط به روش سطح پاسخ (RSM) با ترکیب درصدهای مختلف متغیرهای PET، الیاف فولادی، پودرسنگ و فوق روان‌کننده طراحی گردید. نتایج نشان داد با افزایش درصد PET و درصد الیاف ویسکوزیته بتن کاهش یافته است. همچنین بیشترین مقاومت خمشی از ترکیب %4/0 الیاف، % 8 PET و %1 فوق روان کننده حاصل گردیده است. منحنی‌های تنش – کرنش رسم شده برای طرح‌های مورد بررسی نشان دادند الیاف فولادی در قسمت صعودی منحنی تنش – کرنش تاثیر چندانی نداشته و موجب بهبود پایداری در قسمت نزولی منحنی تنش - کرنش شده است. همچنین ذرات PET موجب کاهش شیب قسمت صعودی منحنی تنش – کرنش شده است. به طور کلی الیاف فولادی و PET، موجب شکست نرم نمونه‌ها شده به صورتی که PET موجب افزایش کرنش نظیر حداکثر مقاومت فشاری شده و الیاف فولادی موجب افزایش کرنش گسیختگی بتن شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and numerical study of the effect of PET and steel fibers on flexural strength and stress-strain curves of self-compacting concretes

نویسندگان [English]

  • Hamed Basser 1
  • Taleb Moradi Shaghaghi 1
  • Hasan Afshin 2
  • Reza saleh Ahari 1
  • saeed mirrezaei 1
1 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 Department of Civil Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

The aim of this study is the experimental and numerical investigation of the simultaneous effect of PET and steel fibers on the rheological properties, flexural strength, and compressive stress-strain curve of self-compacting concrete. For this purpose, 30 mixing designs by response surface method (RSM) were designed by combining different percentages of PET, steel fibers, stone powder, and superplasticizer variables. The results demonstrate that with increasing the percentage of PET and steel fibers, the viscosity of concrete decreased. Also, the highest flexural strength was obtained from the combination of 0.4% fibers, 8% PET, and 1% superplasticizer. The stress-strain curves plotted for the mixtures showed that the steel fibers had little effect on the ascending part of the stress-strain curve and improved the stability on the descending part of the curve. PET particles also reduce the slope of the ascending part of the stress-strain curve. In general, Steel fibers and PET caused the soft failure of the samples so that PET increased the strain corresponding to the maximum compressive strength, and steel fibers increased the rupture strain of concrete.

کلیدواژه‌ها [English]

  • PET
  • STEEL FIBERS
  • RSM
  • FLEXURAL STRENGTH
  • COMPENSIVE STRESS-STRESS CURVE

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