بررسی عملکرد خمشی بتن الیافی با ترکیب‌های‌ مختلف الیاف ماکروسینتتیک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری راه و ترابری، دانشگاه تربیت مدرس، تهران

2 استاد راه و ترابری، دانشگاه تربیت مدرس، تهران

3 استادیار دانشگاه علم و صنعت ایران، تهران

چکیده

بتن به­عنوان یکی از پُرکاربردترین مصالح ساختمانی رفتاری شکننده دارد. فاکتور طراحی روسازی بتنی، مقاومت خمشی 28 روزه بتن است. افزودن الیاف به بتن بر رفتار شکل‏پذیری، مقاومت در برابر ضربه، میزان جذب انرژی، مقاومت پس از ترک خوردگی، مقاومت سایشی و مقاومت کششی بتن اثرگذار بوده و از گسترش ترک جلوگیری می­کند. به همین منظور، پژوهشی آزمایشگاهی جهت بررسی تأثیر ترکیبات مختلف الیاف ماکروسینتتیک بر عملکرد خمشی بتن الیافی شامل مقاومت خمشی، میانگین مقاومت باقیمانده و طاقت خمشی  انجام شد. در این پژوهش، نمونه‏های بتنی طبق استانداردهای ASTM C1609، ASTM C1399 و ASTM C79 با چهار ترکیب مختلف الیاف ماکروسینتتیک پلیمری ساخته شده و مورد ارزیابی قرار گرفت. نتایج آزمایش­های انجام شده نشان داد که با افزودن الیاف به نمونه‏های تیرچه بتنی، مقاومت خمشی به میزان 31/3 96/16 درصد افزایش می­یابد. همچنین، طاقت خمشی و میانگین مقاومت باقیمانده با افزودن الیاف افزایش می­یابد. ضمنا"، به‏دلیل شکست تُرد نمونه‏های بتن معمولی، طاقت خمشی و میانگین مقاومت باقیمانده در چارچوب استاندارد قابل محاسبه نشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigating Flexural Performance of Fiber-Reinforced Concrete with Different Combinations of Macro-Synthetic Fibers

نویسندگان [English]

  • mohammad daneshfar 1
  • Abolfazl Hasani 2
  • Mohamadreza Mohammad Aliha 3
1 Ph.D. student
3 Assistant Professor, Iran University of Science and Technology, Tehran, I. R. Iran.
چکیده [English]

Concrete, as one of the most widely used building materials, has brittle behavior. Concrete pavement design factor is the 28-day concrete flexural strength. Adding fibers to concrete is effective on the ductility behavior, impact resistance, energy absorption, crack resistance, abrasion resistance, and tensile strength of the concrete and prevents crack expansion. For this purpose, a laboratory research was conducted to investigate the effect of different combinations of macro-synthetic fibers on the flexural strength of fiber-reinforced concrete, including flexural strength, average residual strength and flexural toughness. In this study, concrete specimens were constructed according to ASTM C1609, ASTM C1399 and ASTM C79 standards and were evaluated with four different macro-synthetic polymer fibers. Results of the experiments showed that adding fibers to concrete joints, the flexural strength increased by 3.31-16.96 percent. Also, the flexural toughness and average residual strength increased by addition of the fibers. Meanwhile, due to the soft break of regular concrete, flexural toughness and average residual strength could not be computed.
 

کلیدواژه‌ها [English]

  • Fiber concrete
  • Macro-synthetic fibers
  • Flexural strength
  • Average residual strength
  • Flexural toughness
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