ارزیابی مقایسه ای تاثیر نوع الیاف بر خواص مکانیکی بتن فوق توانمند تحت دماهای بالا و رژیم های مختلف خنک سازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشکده فنی و مهندسی، دانشگاه گیلان

2 گروه عمران ، دانشکده فنی و مهندسی شرق گیلان ، دانشگاه گیلان ، رودسر، ایران

3 کارشناس ارشد عمران ، دانشگاه گیلان

10.22124/jcr.2022.21751.1561

چکیده

بتن فوق توانمند نوعی بتن با خواص مکانیکی ارتقاء یافته است که در طرح اختلاط آن علاوه بر سیمان پرتلند و آب معمولا از دوده سیلیس، پودر کوارتز ، مواد کاهنده آب و الیاف طبیعی یا مصنوعی استفاده می شود. با وجود تحقیقات بسیاری که در زمینه بررسی خواص مکانیکی این نوع بتن انجام یافته است ، مطالعات محدودی در زمینه تاثیر الیاف مختلف بر خصوصیات آن تحت دمای بالا به طور مقایسه ای وجود دارد. هدف از این مقاله ارائه داده های آزمایشگاهی درمورد تاثیرنوع الیاف بر خصوصیات مکانیکی بتن های فوق توانمندی میباشد که تحت درجه حرارت بالا قرار گرفته اند و سپس تحت رژیم های مختلف خنک شده اند. در این راستا بتن های فوق توانمند ساخته شده با شش نوع از الیاف بازیافت شده و یا تولید شده در کارخانه، پس از قرار گیری تحت دمای بالا، تحت آزمایش های مقاومت فشاری ، مقاومت کششی به شیوه خمشی و سرعت امواج فراصوت قرار گرفته اند و با بتن شاهد مقایسه شده اند. نتایج نشان می دهد که بتن های حاوی الیاف بازیافت شده پس از قرارگیری تحت تغییرات درجه حرارت، به طور مختصر، افت مقاومت کمتری را نسبت به بتن های حاوی الیاف صنعتی تجربه می کنند. همچنین ارتباط معنا داری بین، سرعت امواج فراصوت پیش از حرارت دهی، و افت مقاومت بتن در دمای 800 درجه ملاحظه می گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparative assessment of fiber type effect on ultra-high-performance concrete after high-temperature heating and cooling

نویسندگان [English]

  • Seyed Hosein Ghasemzadeh Mousavinejad 1
  • Arash Radman 2
  • Sepehr Ghorbani Gil Kelayeh 3
1 Associate Professor, Faculty of Engineering, University of Guilan, Rasht, Iran
2 East Guilan Faculty of Engineering,, University of Guilan, Rasht ,Iran
3 University of Guilan
چکیده [English]

Ultra-high-performance concrete (UHPC) is a type of concrete with high mechanical strengths in which silica fume, quartz powder, superplasticizer and fibers, in addition to cement and water are usually used in its mixture design. In spite of vast studies on the mechanical properties of UHPC, very few comparative studies have been made on the effects of fiber types on the mechanical characteristics of this type of concrete, subjected to high thermal changes. This study aims at providing test results for the effects of temperature changes on the mechanical properties of UHPC that are reinforced with different types of fibers. Six types of fibers, either recycled or industrially manufactured, are utilized in the mixture design. After exposure to high temperature changes, compressive strength, tensile strength in bending, ultrasonic pulse velocity and sorptivity were evaluated and compared. Results of this study can be used in other research studies and can be used in decision making in industrial projects.

کلیدواژه‌ها [English]

  • Ultra High Performance Concrete
  • Fire behavior
  • Mechanical Strength
  • Steel Fiber
  • Polypropylene fiber

مراجع

[1] P. Richard and M. Cheyrezy, "Composition of reactive powder concretes," Cement and Concrete Research, vol. 25, no. 7, pp. 1501-1511, 1995.
[2] C. M. Tam, V. W. Y. Tam, and K. M. Ng, "Assessing drying shrinkage and water permeability of reactive powder concrete produced in Hong Kong," Construction and Building Materials, vol. 26, no. 1, pp. 79-89, 2012.
[3] H. Yazıcı, M. Y. Yardımcı, S. Aydın, and A. Ş. Karabulut, "Mechanical properties of reactive powder concrete containing mineral admixtures under different curing regimes," Construction and Building Materials, vol. 23, no. 3, pp. 1223-1231, 2009.
[4] J. Lyzwa and J. Zehfuss, "Experimental investigations of ultra-high performance concrete exposed to natural fires" Fire Safety Journal, vol. 125, p. 103399, 2021.
[5] H. Qin, J. Yang, K. Yan, J.-H. Doh, K. Wang, and X. Zhang, "Experimental research on the spalling behaviour of ultra-high performance concrete under fire conditions," Construction and Building Materials, vol. 303, p. 124464, / 2021.
[6] M.-X. Xiong and J. Y. R. Liew, "Fire resistance of high-strength steel tubes infilled with ultra-high-strength concrete under compression," Journal of Constructional Steel Research, vol. 176, p. 1064 ,2021 , 10.
[7] Y. N. Chan, X. Luo, and W. Sun, "Compressive strength and pore structure of high-performance concrete after exposure to high temperature up to 800°C," Cement and Concrete Research, vol. 30, no. 2, pp. 247-251, 2000.
[8] G. Choe, G. Kim, N. Gucunski, and S. Lee, "Evaluation of the mechanical properties of 200MPa ultra-high-strength concrete at elevated temperatures and residual strength of column," Construction and Building Materials, vol. 86, pp. 159-168, 2015.
[9] Y. W. Lee, G. Y. Kim, N. Gucunski, G. C. Choe, and M. H. Yoon, "Thermal strain behavior and strength degradation of ultra-high-strength-concrete," Materials and Structures, vol. 49, no. 8, pp. 3411-3421, 2016.
[10] X. Liang, C. Wu, Y. Su, Z. Chen, and Z. Li, "Development of ultra-high performance concrete with high fire resistance," Construction and Building Materials, vol. 179, pp. 400-412, 2018.
[11] A. Q. Sobia, M. S. Hamidah, I. Azmi, and S. F. A. Rafeeqi, "Elevated temperature resistance of ultra-high-performance fibre-reinforced cementitious composites," Magazine of Concrete Research, vol. 67, no. 17, pp. 923-937, 2015.
[12] M.-X. Xiong and J. Y. R. Liew, "Mechanical behaviour of ultra-high strength concrete at elevated temperatures and fire resistance of ultra-high strength concrete filled steel tubes," Materials & Design, vol. 104, pp. 414-427, 2016.
[13] M.-X. Xiong and J. Y. R. Liew, "Spalling behavior and residual resistance of fibre reinforced Ultra-High performance concrete after exposure to high temperatures," Materials de Construccion , vol. 65, 2015.
[14] C. Kahanji, F. Ali, and A. Nadjai, "Explosive Spalling of Ultra-High Performance Fibre Reinforced Concrete Beams Under Fire," 2016.
[15] W. M. Lin, T. D. Lin, and L. J. Powers-Couche, "Microstructures of Fire-Damaged Concrete," ACI Materials Journal, vol. 93, no. 3, pp. 199-205, 1996.
[16] A. H. Akca and N. Özyurt Zihnioğlu, "High performance concrete under elevated temperatures," Construction and Building Materials, vol. 44, pp. 317-328, 2013.
[17] Z. Yang, "Study on mechanical properties of reactive powder concrete " Ph.D. thesis, DaLian JiaoTong University, China, 2008.
[18] S.-T. Kang, Y. Lee, Y.-D. Park, and J.-K. Kim, "Tensile fracture properties of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) with steel fiber," Composite Structures, vol. 92, no. 1, pp. 61-71, 2010.
[19] Z. Onur Pehlivanlı and İ. Uzun, "Effect of polypropylene fiber length on mechanical and thermal properties of autoclaved aerated concrete," Construction and Building Materials, vol. 322, p. 126506, 2022.
[20] R. Yu, P. Spiesz, and H. J. H. Brouwers, "Mix design and properties assessment of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC)," Cement and Concrete Research, vol. 56, pp. 29-39, 2014.
[21] V. T. A. Van and H. M. Ludwig, "Proportioning optimization of UHPC containing rice husk ash and ground granulated blast-furnace slag," in 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials, , Kassel, Germany, 2012.
[22] D. J. Kim, S. H. Park, G. S. Ryu, and K. T. Koh, "Comparative flexural behavior of Hybrid Ultra High Performance Fiber Reinforced Concrete with different macro fibers," Construction and Building Materials, vol. 25, no. 11, pp. 4144-4155, 2011.
[23] A. Behnood and M. Ghandehari, "Comparison of compressive and splitting tensile strength of high-strength concrete with and without polypropylene fibers heated to high temperatures," Fire Safety Journal, vol. 44, no. 8, pp. 1015-1022, 2009.

فایل ها

هم رسانی

ارجاع به این مقاله

آمار