بررسی رفتار مکانیکی بتن ساخته شده با الیاف بازیافتی پت برای کاربردهای سازه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه مهندسی عمران ،دانشکده مهندسی، دانشگاه فردوسی مشهد ،مشهد

3 دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران.

10.22124/jcr.2021.17542.1452

چکیده

با توجه به افزایش روز افزون استفاده از بطری های پت، تحقیق کنونی تلاشی برای بهره جویی از الیاف ساخته شده از بطری های بازیافتی پت در صنعت بتن می باشد. از طرفی رفتار بتن معمولی حاوی الیاف بازیافتی هنوز به طور کامل مطالعه نگردیده و دستور العمل های لازم منتشر نشده است. در این پژوهش اثر الیاف پلی اتیلن ترفتالات بر روی خواص مکانیکی بتنِ سخت شده بررسی می‌شود. به این منظور، الیاف در سه اندازه 1 ،2 و3 سانتی متر و سه تراکم حجمی 15/0 %، 30/0 % و 45/0 % برای این تحقیق انتخاب شدند. همه مخلوط‌ها برای مقاومت فشاری، مقاومت کششی، مقاومت خمشی، دوام و ضربه مورد آزمایش قرار گرفتند. نتایج نشان داد که با افزودن الیاف، مقاومت فشاری، مقاومت خمشی و جذب انرژی به ترتیب 5 تا 18 درصد، 6 تا 30 درصد و 30 تا 156 درصد افزایش می‌یابند در حالیکه مقاومت کششی تغییر محسوسی نداشته و حتی کاهش مقاومت مشاهده می‌شود. نتایج حاکی از افزایش 17 تا 160 درصدی سختی و طاقت خمشی، در ترکیبات بتنی الیافی نسبت به بتن معمولی می باشد. همچنین ضربه پذیری بتن الیافی نیز نسبت به بتن شاهد 2 تا 7 برابر افزایش می‌یابد. با مقایسه مجموعه نتایج آزمایش ها، مشخص گردید که با توجه به جمیع جها یاد شده، ترکیبات حاوی الیاف 2 سانتیمتر با نسبت حجمی 45/0 % عملکرد بهتری نسبت به سایر نمونه ها دارند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation of the mechanical behavior of concrete made with recycled PET fibers for structural applications

نویسندگان [English]

  • Morteza Toufani 1
  • Mohammad Reza Esfahani 2
  • Ebrahim Zamani 3
1 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)
2 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)
3 Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran.
چکیده [English]

According to increasing the use of PET products, the present study aimed to the use of PET fibers in the concrete industries. Moreover, the behavior of normal concrete contained recycled fibers is not studied and the guidelines aren’t published yet. The aim of this study was to determine the effect of polyethylene terephthalate fibers on the mechanical properties of hardened concrete. Fibers were used in three volumetric percentages of 0.15%, 0.30%, and 0.45% with the lengths of 1, 2, and 3 centimeters, separately. So, 10 combinations of specimens including the control specimen and 9 combinations of PET fiber reinforced concrete were made. All mixtures were examined for compressive strength, tensile strength, flexural strength, shrinkage, durability, and impact loading.

The results showed that by adding the PET fibers, the compressive strength, the bending strength, and energy absorption increase 5 to 18 percent, 6 to 30 percent, and 30 to 156 percent, respectively. However, no noticeable change was observed in tensile strength , while even a reduction in tensile strength is monitored. The impact strength of the fiber concrete was increased two to seven times in comparison with the control concrete. By comparing the experimental results it was determined that the combinations that contained 2 cm fibers with 0.45% volume had the best performance compared with the other mixtures.

کلیدواژه‌ها [English]

  • Fiber concrete
  • recyclable PET fiber
  • shrinkage
  • bending strength
  • impact loading

مراجع

[1] Bencardino, F., et al., Implications of test methodology on post-cracking and fracture behaviour of steel fibre reinforced concrete. Composites Part B: Engineering, 2013. 46: p. 31-38.
[2] Foti, D., Use of recycled waste pet bottles fibers for the reinforcement of concrete. Composite Structures, 2013. 96: p. 396-404.
[3] Fraternali, F., et al., On the use of R-PET strips for the reinforcement of cement mortars. Composites Part B: Engineering, 2013. 46: p. 207-210.
[4] Irwan, J., et al. The mechanical properties of PET fiber reinforced concrete from recycled bottle wastes. in Advanced Materials Research. 2013. Trans Tech Publ.
[5] Nibudey, R., et al., Compressive strength and sorptivity properties of pet fiber reinforced concrete. International Journal of Advances in Engineering & Technology, 2014. 7(4): p. 1206.
[6] da Silva Magalhãesand, M. and M.S.V. Fernandes, Bending Behaviour of Recycled PET Fiber Reinforced Cement-Based Composite. International Journal of Engineering and Technology, 2015. 7(4): p. 282.
[7] Ochi, T., S. Okubo, and K. Fukui, Development of recycled PET fiber and its application as concrete-reinforcing fiber. Cement and Concrete Composites, 2007. 29(6): p. 448-455.
[8] Kim, S.B., et al., Material and structural performance evaluation of recycled PET fiber reinforced concrete. Cement and concrete composites, 2010. 32(3): p. 232-240.
[9] Bui, N.K., T. Satomi, and H. Takahashi, Recycling woven plastic sack waste and PET bottle waste as fiber in recycled aggregate concrete: An experimental study. Waste Management, 2018. 78: p. 79-93.
[10] Adnan, H.M. and A.O. Dawood, Strength behavior of reinforced concrete beam using re-cycle of PET wastes as synthetic fibers. Case Studies in Construction Materials, 2020. 13: p. e00367.
[11] (ISIRI), I.o.s.a.i.r.o.I., Specification for Portland cement. 1996: Tehran, Iran.
[12] Rahimi, S., et al., Sustainable approach for recycling waste tire rubber and polyethylene terephthalate (PET) to produce green concrete with resistance against sulfuric acid attack. Journal of Cleaner Production, 2016. 126: p. 166-177.
[13] Center, B.a.H.R., The national method for concrete mix design. 2008: Tehran, Iran.
[14] Borg, R.P., O. Baldacchino, and L. Ferrara, Early age performance and mechanical characteristics of recycled PET fibre reinforced concrete. Construction and Building Materials, 2016. 108: p. 29-47.
[15] Committee201, A., Guide for Making a Condition Survey of Concrete in Service, ACI 201.1 R. 1.7. 1997, American Concrete In-stitute.
[16] de Oliveira, L.A.P. and J.P. Castro-Gomes, Physical and mechanical behaviour of recycled PET fibre reinforced mortar. Construction and Building Materials, 2011. 25(4): p. 1712-1717.
[17] Hasan, M., M. Afroz, and H. Mahmud, An experimental investigation on mechanical behavior of macro synthetic fiber reinforced concrete. Int. J. Civ. Environ. Eng, 2011. 11(3): p. 19-23.
[18] Iran, I.o.S.a.I.R.o., Concrete- flexural strength of concrete (using simple –beam with third – point loading)-Test method. 2007: Tehran, Iran.
[19] Marthong, C. and S. Marthong. An experimental study on the effect of PET fibers on the behavior of exterior RC beam-column connection subjected to reversed cyclic loading. in Structures. 2016. Elsevier.
[20] Organization, I.N.S., Concrete Aggregates - Specifications. 2015: Tehran, Iran.
[21] Mohammed, A.A. and A.A.F. Rahim, Experimental behavior and analysis of high strength concrete beams reinforced with PET waste fiber. Construction and Building Materials, 2020. 244: p. 118350.
[22] Committee, A.C.I.-A., ACI-544.2 R-89: Measurement of properties of fiber reinforced concrete. Detroit: ACI Committee, 1989.
[23] Organization, I.N.S., Concrete – making and curing concrete test specimens in the laboratory – code of practice. 2015: Tehran, Iran.
[24] SF, J., Method of test for flexural strength and flexural toughness of fiber reinforced concrete. Japan Concrete Institute, 1984.
[25] ‐, I., Methods of sampling and analysis of concrete. 2004, Bureau of Indian Standards New Delhi, India.

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