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
2
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

مراجع

Alberti, M., Enfedaque, A. and Gálvez, J. 2017. “Fibre reinforced concrete with a combination of polyolefin and steel-hooked fibres”. Composite Struct., 171: 317-325.
ACI 360R-10. 2010. “Guide to design of slabs-on-ground. ACI Committee 360.
ACI 211.1-91. 2009. Standard practice for selecting proportions for normal, heavyweight, and mass concrete. ACI Committee 211.
Afroughsabet, V. and Ozbakkaloglu, T. 2015. “Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers”. Constr. Build. Mater., 94: 73-82.
ASTM, C. 2002. “Test method for obtaining average residual-strength of fiber-reinforced concrete”. Annual Book of ASTM Standards, 4, pp. 1-5.
ASTM C78-09. 2009. “Standard test method for flexural strength of concrete (using simple beam with third-point loading). ASTM International.
ASTM C1609. 2011. “Standard test method for flexural performance of fiber-reinforced concrete (using beam with third-point loading). Book of ASTM Standards.
Bordelon, A. and Roesler, J. R. 2009. “Fiber-reinforced concrete pavement design and material requirements”. 8th International Conference (BCR2A'09), Bearing Capacity of Roads, Railways and Airfields.
Daneshfar, M., Hassani, A., Aliha, M. R. M. and Berto, F. 2017. “Evaluating mechanical properties of macro-synthetic fiber-reinforced concrete with various types and contents”. Strength of Mater., 49: 618-626.
Eswari, S. 2015. “Experimental investigation on flexural performance of hybrid fibre reinforced concrete”. Int. Res. J. Eng. Technol., 2(3): 1772-1776.
Fallah, S. and M. Nematzadeh. 2017. “Mechanical properties and durability of high-strength concrete containing macro-polymeric and polypropylene fibers with nano-silica and silica fume”. Constr. Build. Mater., 132: 170-187.
Hesami, S., Ahmadi, S. and Nematzadeh, M. 2014. “Effects of rice husk ash and fiber on mechanical properties of pervious concrete pavement”. Constr. Build. Mater. 53: 680-691.
Hesami, S., Hikouei, I. S. and Emadi, S. A. A. 2016. “Mechanical behavior of self-compacting concrete pavements incorporating recycled tire rubber crumb and reinforced with polypropylene fiber”. J. Clean. Prod., 133: 228-234.
Jadhav, H. and Koli, M. 2013. “Flexural behavior of hybrid fiber reinforced concrete beams”. Int. J. Struct. Civ. Eng. Res., 2: 211-218.
Jiabiao, J., Loh, S. and Gasho, T. 2004. “Synthetic structure fibers for toughness and crack control of concrete”. 29th Conference on Our World in Concrete and Structures, 25-26 Aug., Singapore.
Karadelis, J. N. and Lin, Y. 2015. “Flexural strengths and fibre efficiency of steel-fibre-reinforced, roller-compacted, polymer modified concrete”. Constr. Build. Mater., 93: 498-505.
Kumar, R., Goel, P. and Mathur, R. 2013. “Suitability of concrete reinforced with synthetic fiber for the construction of pavements”.  Proc. of the 3rd International Conference on Sustainable Construction Materials and Technologies.
Lee, J. H., Cho, B. and Choi, E. 2017. “Flexural capacity of fiber reinforced concrete with a consideration of concrete strength and fiber content”. Constr. Build. Mater., 138: 222-231.
Li, Z. 2011. “Advanced concrete technology”. John Wiley and Sons, N. Y.
Pająk, M. and Ponikiewski, T. 2013. “Flexural behavior of self-compacting concrete reinforced with different types of steel fibers”. Constr. Build. Mater., 47: 397-408.
Pakravn, H., Latifi, M. and Jamshidi, M. 2017. “Hybrid short fiber reinforcement system in concrete: A review”. Constr. Build. Mater., 142: 280-294.
Ramujee, K. 2013. “Strength properties of polypropylene fiber reinforced concrete”. Int. J. Innov. Res. Sci. Eng. Technol., 2: 3409-3413.
Rao, G. A. and Rao, A. 2010. “Toughness indices of fiber reinforced concrete subjected to mode II loading. Proc. of FraMCoS-7, pp. 112-117.
Rooholamini, H., Hassani, A. and Aliha, M. 2018. “Evaluating the effect of macro-synthetic fibre on the mechanical properties of roller-compacted concrete pavement using response surface methodology”. Constr. Build. Mater., 159: 517-529.
Saidani, M., Saraireh, D. and Gerges, M. 2016. “Behaviour of different types of fibre reinforced concrete without admixture”. Eng. Struct. 113: 328-334.
Singh, S., Singh, A. and Bajaj, V. 2010. “Strength and flexural toughness of concrete reinforced with steel-polypropylene hybrid fibres”. Asian J. Civ. Eng. (Build. Hous.), 11(4): 495-507.
Silva, F. and Thaumaturgo, C. 2003. “Fibre reinforcement and fracture response in geopolymeric mortars”. Fatigue Fract. Eng. Mater. Struct., 26(2): 167-172. 
Toledo Filho, R. D. and Sanjuan, M. A. 1999. “Effect of low modulus sisal and polypropylene fibre on the free and restrained shrinkage of mortars at early age”. Cement Concrete Res., 29: 1597-1604.
Vairagade, V., Kene, K. and Deshponde, N. 2012. “Investigation of compressive and tensile behavior of fibrillated polypropylene fibers reinforced concrete. Int. J. Eng. Res. Appl., 2: 1111-1115.
Vibhuti, R. B. and Radhakrishna, A. N. 2013. “Mechanical properties of hybrid fiber reinforced concrete for pavements”. Int. J. Res. Eng. Technol.
Yew, M. K., Mahmud, H. B., Ang, B. C. and Yew, M. C. 2015. “Influence of different types of polypropylene fibre on the mechanical properties of high-strength oil palm shell lightweight concrete. Constr. Build. Mater., 90: 36-43.
Yoo, D. Y., Kim, S. W. and Park, J. J. 2017. “Comparative flexural behavior of ultra-high-performance concrete reinforced with hybrid straight steel fibers. Constr. Build. Mater., 132: 219-229.

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سابقه مقاله

  • تاریخ دریافت: 31 مرداد 1396
  • تاریخ بازنگری: 25 بهمن 1396
  • تاریخ پذیرش: 04 اسفند 1396

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