تاثیر الیاف ضایعاتی فرش ماشینی فرسوده بر خصوصیات مکانیکی و جذب انرژی بتن خود تراکم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، دانشگاه آزاد واحد خمین، خمین، ایران

2 استادیار، گروه مهندسی عمران، دانشگاه هرمزگان

چکیده

این تحقیق تاثیر الیاف ضایعاتی فرش ماشینی فرسوده بر خصوصیات بتن تازه و سخت شده بتن خود تراکم می‌پردازد. الیاف فرش ضایعاتی در درصدهای 0، 5/0، 0/1 و % 5/1 حجم بتن برای بررسی به بتن خود تراکم اضافه شدند. آزمایش‌های بتن خود متراکم تازه شامل آزمایش‌های جریان اسلامپ، حلقه جی، قیف وی، جعبه‌ ال-شکل بودند. برای نمونه‌های سخت شده الیاف در دو حالت عمل آوری نرمال و رطوبت نسبی %30 بررسی شدند و آزمایش‌های مقاومت فشاری و مقاومت خمشی در سن 28 روزه روی آن‌ها انجام شد. از نمودار بار- جابجایی بر اساس داده‌های آزمایش خمشی برای محاسبه اندیکس چقرمگی خمشی استفاده شد. نتایج حاصل از این پژوهش نشان می‌دهد که با افزودن الیاف ضایعاتی صنعت فرش به بتن شاهد کاهش خصوصیات کارایی بتن تازه هستیم هرچند این کاهش کارایی برای الیاف تا %1 هنوز در محدوده آیین‌نامه‌ای قرار دارد. مقاومت فشاری از 0 تا % 5/1 کاهش قابل ملاحظه‌ای (از 36 به MPa 19) می‌یابد. پس از ترک خوردگی اولیه در جابجایی‌ای بزرگی نظیر mm2 می‌توان انتظار داشت که میزان بار برای همه نمونه‌های حاوی الیاف از kN 5/5 بالاتر باشد. تاثیر عمده الیاف در اندیکس چقرمگی خمشی خود را نشان می‌دهد بطوریکه از 0 تا % 5/0 الیاف اندیکس بیش از %90 افزایش می‌یابد اما بعد از این درصد تغییر عمده‌ای نمی‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of industrial carpet waste fibers on the mechanical and toughness properties of self-compacting concrete

نویسندگان [English]

  • Navid Ghasemi 1
  • Arash Byat 1
  • Hamed Rooholamini 2
1 M.Sc., Grad., Civil Engineering Department, Azad University, Khomein Branch, Khomein, Iran.
2 Civil engineering department University of Hormozgan.
چکیده [English]

This research was aimed to evaluate the effect of the recycled waste carpet fiber on the mechanical properties of self-compacting concrete (SCC). Waste carpet fibers in 0, 0.5, 1.0 and 1.5% of volumes fraction of SCC were added. SCC samples have two different curing procedure; normal curing and curing at relative humidity of 30 %. For fresh stage, slump flow test, j-ring, V funnel and L box were done and for hardened stage, compressive and flexural tests were performed at the age of 28 days. The load–deflection curves were extracted from flexural test data to calculate the flexural toughness. Results show that by increasing fiber from 0 to 1.5%, the workability of SCC and compressive strength significantly decreases. However, reduction in workability for fibers up to 1% is still in the acceptable limits of EFNARC. From 0 to 1.5% waste fiber in flexural test, significant increases in energy absorption and toughness index were observed. The major increase in toughness index were observed from 0 to 0.5 % and after that does not change considerably.

کلیدواژه‌ها [English]

  • Industrial Waste Carpet Fiber
  • Self-Compacting Concrete
  • Index of Flexural Toughness

مراجع

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