بررسی‌ آزمایشگاهی تأثیر ترکیب الیاف ماکروسنتتیک و خرده لاستیک بر رفتار بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری ،گروه مهندسی عمران ،واحد شاهرود ، دانشگاه آزاداسلامی ،شاهرود،ایران

2 استادیار،گروه مهندسی عمران ، واحد شاهرود ، دانشگاه آزاداسلامی ،شاهرود،ایران

10.22124/jcr.2026.31288.1713

چکیده

یکی از مهم‌ترین محدودیت‌های بتن، مقاومت کششی پایین و رفتار شکننده آن در برابر بارهای کششی و خمشی است. در راستای بهبود عملکرد مکانیکی بتن، استفاده از الیاف تقویت‌کننده و مصالح بازیافتی به‌عنوان رویکردی مؤثر و پایدار مورد توجه قرار گرفته است. پژوهش حاضر با هدف بررسی تأثیر هم‌زمان الیاف ماکروسنتتیک کورتا و خرده لاستیک بر خواص مکانیکی بتن، شامل مقاومت فشاری، خمشی و حداکثر بار قابل تحمل توسط دال بتنی و شکل‌پذیری، به‌صورت آزمایشگاهی انجام شده است. بدین منظور، 24 نمونه با سه طرح اختلاط مختلف شامل ۱٪ الیاف کورتا و ۵٪ و ۱۰٪ خرده لاستیک تهیه و آزمایش گردید. نتایج نشان داد که طرح اختلاط حاوی ۵٪ خرده لاستیک و ۱٪ الیاف کورتا (CG5F1)، در مقایسه با بتن شاهد، موجب افزایش ۱۲٫۷٪ در مقاومت فشاری، ۵٫۸٪ در مقاومت خمشی و 21.6٪ در حداکثر بار قابل تحمل توسط دال بتنی گردیده است. این یافته‌ها بیانگر آن است که افزودن الیاف کورتا می‌تواند اثرات منفی احتمالی خرده لاستیک را کاهش داده و به بهبود ویژگی‌های مکانیکی بتن منجر شود. در نتیجه، استفاده هدفمند و کنترل‌شده از این افزودنی‌ها می‌تواند در راستای تولید بتن‌های با عملکرد بهینه و سازگار با اصول توسعه پایدار مؤثرباشد. در جمع‌بندی، نتایج این پژوهش نشان می‌دهد که استفاده از الیاف ماکروسنتتیک کورتا به‌عنوان تقویت‌کننده برای کاربردهای سازه‌ای مناسب و مؤثر است، در حالی‌که به‌کارگیری خرده لاستیک به دلیل کاهش برخی پارامترهای مقاومتی، در بتن‌های سازه‌ای توصیه نمی‌گردد و باید از آن اجتناب شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Combined Macro-Synthetic Fibers and Crumb Rubber on Concrete Behavior: An Experimental Investigation

نویسندگان [English]

  • mahdi abbasi sardarabadi 1
  • ahmad ganjali 2
  • ehsan kashi 2
  • Hamidreza Irani 2
1 PhD student, Department of Civil Engineering, Sha.c., IslamicAzadUniversity, Shahrood, Iran.
2 Assistant Professor, Department of Civil Engineering, Sha.c. Islamic Azad University, Shahrood, Iran.
چکیده [English]

One of the most significant limitations of concrete is its low tensile strength and brittle behavior under tensile and flexural loads. To enhance the mechanical performance of concrete, the use of reinforcing fibers and recycled materials has emerged as an effective and sustainable approach. The present study aims to investigate the combined effect of Corte macro synthetic fibers and crumb rubber on the mechanical properties of concrete, including compressive strength, flexural strength, maximum load capacity of concrete slabs, and ductility, through experimental testing. For this purpose, 24 specimens with three different mix designs containing 1% Corte fibers and 5% and 10% crumb rubber were prepared and tested. The results indicated that the mix design containing 5% crumb rubber and 1% Corte fibers (CG5F1) led to increases of 12.7% in compressive strength, 5.8% in flexural strength, and 21.6% in the maximum load capacity of concrete slabs compared to the control mix. These findings suggest that the addition of Corte fibers can mitigate the potential adverse effects of crumb rubber and improve the mechanical properties of concrete. Consequently, the targeted and controlled use of these additives can contribute to producing concrete with optimized performance aligned with sustainable development principles. In conclusion, the results of this study demonstrate that the use of Corte macro synthetic fibers as reinforcement is suitable and effective for structural applications, whereas the application of crumb rubber is not recommended in structural concrete due to its detrimental impact on certain strength parameters and should be avoided

کلیدواژه‌ها [English]

  • Macro-Synthetic
  • concrete
  • strength of concrete

مراجع

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