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تاثیر الیاف ترکیبی با نسبت ابعادی مختلف بر مقاومت ضربه ای بتن پرمقاومت حاوی افزودنیهای معدنی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 1، دوره 56، شماره 9، 1403، صفحه 1079-1102 اصل مقاله (1.29 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2024.23050.8097 | ||
| نویسندگان | ||
| احمد رمضانی1؛ میثم صمدی* 1؛ محمد فیاض2 | ||
| 1گروه عمران، واحد مشهد، دانشگاه آزاد اسلامی، مشهد ، ایران | ||
| 2گروه عمران، دانشگاه امام حسین (ع) ، تهران، ایران | ||
| چکیده | ||
| بهبود مشخصات مکانیکی بتن بهعنوان پایهایترین ماده در ساخت سازههای مختلف، بهویژه مقاومت کششی، خمشی و ضربهای آن از دیرباز موردتوجه پژوهشگران مختلف بوده است. در این تحقیق به بررسی اثر افزودن الیاف فولادی در نسبت ابعادی مختلف به همراه الیاف پلیپروپیلن با افزودنیهای معدنی پرکاربرد بهمنظور بهبود مقاومت ضربهای بتن پرداخته شده است. پارامترهای در نظر گرفته شده شامل درصد الیاف پلیپروپیلن و فولادی، نسبت طول به قطر الیاف فولادی (L/D)، درصد افزودنیهای خاکستربادی، میکروسیلیس و اپوکسی، در سنین مختلف نمونهها بوده است. آزمایشهایی باهدف تعیین مقاومت ضربهای، کششی، خمشی و فشاری روی نمونههای بتنی تحقیق انجام شد. برای تعیین مقاومت ضربهای، روش آزمایشگاهی نوینی معرفی و مورداستفاده قرار گرفت. نتایج حاصل از مقاومت فشاری، کششی و خمشی نمونههای بتن در سنین مختلف ۷، ۲۸ و ۹۰ روزه، بیانگر تأثیر چشمگیر استفاده از الیاف ترکیبی با نسبت ابعادی بهینه بر افزایش مقاومت کششی و ضربهای و تا حدودی ضعیفتر بر مقاومت فشاری و خمشی بتن است که این مقادیر در نمونههای ۲۸ روزه برای مقاومت کششی ۲۳ درصد و مقاومت فشاری و خمشی به ترتیب ۱۱ و ۱۸ درصد نسبت به نمونه شاهد افزایش پیدا کردهاند. همچنین تأثیرگذاری بیشتر استفاده از افزودنیهای معدنی بر افزایش مقاومت خمشی بتن نسبت به استفاده از الیاف مشاهده گردید. مقایسه نمونهها با نسبت L/D الیاف فولادی مختلف نشان داد که الیاف با نسبت L/D کمتر به بهبود بیشتری در مشخصات مکانیکی بتن منجر میشوند. نهایتاً استفاده از الیاف ترکیبی با L/D بهینه و افزودنیهای معدنی باعث افزایش مقاومت ضربهای جذب انرژی 4/97 برابری نمونههای بتنی بهینه نسبت به نمونه بتن شاهد گردیده است. | ||
| کلیدواژهها | ||
| بتن الیافی؛ مقاومت ضربه ای؛ خواص مکانیکی؛ الیاف ترکیبی؛ نسبت ابعادی الیاف؛ افزودنی معدنی | ||
| موضوعات | ||
| مصالح نوین جهت اصلاح خواص بتن | ||
| عنوان مقاله [English] | ||
| The effect of hybrid fibers with various dimensions on the impact strength of concrete containing mineral additives | ||
| نویسندگان [English] | ||
| ahmad ramazani1؛ Maysam Samadi1؛ Mohammad Fayyaz2 | ||
| 1Department of civil engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran | ||
| 2University of Imam Hussein (AS), Tehran, Iran | ||
| چکیده [English] | ||
| Improving the mechanical characteristics of concrete as the most basic material in the construction of various structures, especially its tensile, bending, and impact resistance, has long been the focus of various researchers. In this research, the effect of adding different steel fibers along with polypropylene fibers in different dimensional ratios together with commonly used mineral additives to improve the impact resistance of concrete has been investigated. The considered parameters included the percentage of polypropylene and steel fibers, the ratio of length to diameter of steel fibers (L/D), the percentage of fly ash, microsilica, and epoxy additives, and the age of the specimen. Experiments aimed at determining the impact, tensile, bending, and compressive strength of the studied concrete specimens were carried out. To determine the impact resistance, a new laboratory method was introduced and used. The results obtained from the strength of concrete samples at different ages of 7, 28, and 90 days show the significant effect of using composite fibers with optimal aspect ratio on increasing the tensile and impact resistance and to a lesser extent on the compressive and bending strength of concrete. These values have increased by 23% for tensile strength and 11% and 18% for compressive and bending strength, respectively, compared to the control sample in 28-day samples. Also, it was observed that the use of mineral additives is more effective in increasing the flexural strength of concrete than the use of fibers. A comparison of samples with L/D ratio of different steel fibers showed that fibers with a lower L/D ratio lead to greater improvement in the mechanical properties of concrete. Finally, using combined fibers with optimal L/D and mineral additives has increased the impact resistance and energy absorption by 4.97 times of the optimal concrete samples compared to the witness concrete sample. | ||
| کلیدواژهها [English] | ||
| Fiber Concrete, Impact Resistance, Mechanical Properties, Hybrid Fibers, Aspect Ratio, Mineral Additive | ||
| مراجع | ||
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[1] Romualdi, J. P., & Batson, G. B, Behavior of reinforced concrete beams with closely spaced reinforcement, In Journal Proceedings ,Vol. 60 (1963, June) No. 6, pp. 775-790. [2] Naaman, A. E., & Shah, S. P. , Pull-out mechanism in steel fiber-reinforced concrete,Journal of the Structural Division, 102(8) (1976) 1537-1548. [3] Dushimimana, A, Niyonsenga, A. A., & Nzamurambaho, F, A review on strength development of high performance concrete, Construction and Building Materials, 307(2021)124865. [4] Aoude, H., Dagenais, F. P., Burrell, R. P., & Saatcioglu, M, Behavior of ultra-high performance fiber reinforced concrete columns under blast loading, International Journal of Impact Engineering, 80 (2015) 185-202. [5] Luccioni, B., Isla, F., Codina, R., Ambrosini, D., Zerbino, R., Giaccio, G., & Torrijos, M. C, Effect of steel fibers on static and blast response of high strength concrete, International journal of impact engineering, 107(2017) 23-37. [6] Burrell, R. P., Aoude, H., & Saatcioglu, M, Response of SFRC columns under blast loads, Journal of Structural Engineering, 141(9) (2015) 04014209. [7] Lv, Y., Wu, H., Dong, H., Zhao, H., Li, M., & Huang, F, Experimental and numerical simulation study of fiber-reinforced high strength concrete at high strain rates, Journal of Building Engineering, 105812 (2023). [8] Wu, H., Shen, A., Ren, G., Ma, Q., Wang, Z., Cheng, Q., & Li, Y, Dynamic mechanical properties of fiber-reinforced concrete: A review, Construction and Building Materials, 366 (2023) 130145 [9] Jiao, C., Sun, W., Huan, S., & Jiang, G, Behavior of steel fiber-reinforced high-strength concrete at medium strain rate, Frontiers of Architecture and Civil Engineering in china, 3(2009)131-136. [10] Yang, L., Lin, X., Li, H., & Gravina, R. J, A new constitutive model for steel fibre reinforced concrete subjected to dynamic loads, Composite Structures, 221(2019)110849. [11] Yang, L., Lin, X., & Gravina, R. J, Evaluation of dynamic increase factor models for steel fibre reinforced concrete. Construction and building materials, 190 (2018) 632-644. [12] Afroughsabet, V, & Ozbakkaloglu, T, Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers, Construction and building materials, 94 (2015)73-82. [13] Chen, J., Yuan, Y., Zhu, Q., & Duan, J,High-temperature resistance of high-strength concrete with iron tailing sand. Journal of Building Engineering, 63(2023)105544. [14] Rai, B., & Singh, N. K, Statistical and experimental study to evaluate the variability and reliability of impact strength of steel-polypropylene hybrid fiber reinforced concrete, Journal of Building Engineering, 44 (2021) 102937 [15] Hou, X., Cao, S., Zheng, W., Rong, Q., & Li, G, Experimental study on dynamic compressive properties of fiber-reinforced reactive powder concrete at high strain rates, Engineering Structures, 169 (2018) 119-130 [16] Ojha, P. N., Singh, P., Singh, B., Singh, A., & Mittal, P, Fracture behavior of plain and fiber reinforced high strength concrete containing high strength steel fiber, Research on Engineering Structures and Materials, 8(3) (2022) 583-602. [17] Kumar, M. H., Saikrishnamacharyulu, I., Mohanta, N. R., Ashutosh, A., Mishra, P., & Samantaray, S, Mechanical behaviour of high strength concrete modified with triple blend of fly ash, silica fume and steel fibers, Materials Today: Proceedings, 65 (2022) 933-942. [18] Nodehi, Mehra ,Epoxy, polyester and vinyl ester based polymer concrete: a review, Innovative Infrastructure Solutions 7, no. 1 (2022): 64. [19] Bedi, R., Chandra, R., & Singh, S. P, Mechanical properties of polymer concrete, Journal of Composites,(2013) 1-12. [20]Ataabadi, H. Sanaei, Abdolreza Zare, H. Rahmani, A. Sedaghatdoost, and E. Mirzaei, Lightweight dense polymer concrete exposed to chemical condition and various temperatures: An experimental investigation, Journal of Building Engineering 34 (2021): 101878. [21]Karamzadeh, N. Shahni, M. R. M. Aliha, and H.R. Karimi, Investigation of the effect of components on tensile strength and mode-I fracture toughness of polymer concrete, Arabian Journal of Geosciences 15, no. 13 (2022): 1213. [22] Song, P. S., J. C. Wu, S. Hwang, and B. C. Sheu,Assessment of statistical variations in impact resistance of high-strength concrete and high-strength steel fiber-reinforced concrete, Cement and concrete research 35, no. 2 (2005): 393-399. [23] M.Rokhshani Mehr, & Bakhshi, investigation of Impact Behavior of High Strength Concrete and Ultra-High Performance Steel Fiber Reinforced Concrete under Impact of Projectile, Concrete research, no. 1 (2015): 101-112(in Persian) [24] GH. Sezari, M. Dehghani Ashkezar, Investigating the impact performance of concrete with high strength and high-strength fiber concrete under projectile impact, Malik Ashtar University of Technology, Tehran, (2018): 337-348(in Persian) [25] H. R. Hasanpour Berijani, Emamzadeh, S. Sh, Experimental Study of Lightweight Projectiles Penetration in Concrete with Waste Steel Shavings and Rice Husk Ash,magiran.com/p131997 (2014): 57- 66(in Persian) [26] Badr.A, Ashour.AF, Platten.A., Statistical Variations in Impact Resistance of Polypropylene Fibre-Reinforced Concrete, International Journal of Impact Engineering 32, (2006), 1907–1920. [27] ACI 544-2R. Measurement of Properties of Fiber Reinforced Concrete; American Concrete Institute: Indianapolis, IN, USA, 1999 [28] ASTM D 1557, Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort [29] Mindess, Sidney, J. Francis Young, and David Darwin, (2003), Concrete. Prentice Hall. [30] BS 1881–116, Method for determination of compressive strength of concrete cubes,1983. [31] ASTM Standard C 496–90, Test Method for Splitting Tensile Strength of Cylindrical Concret Specimens, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, 1990 [32] ASTM C1018-89Standard Test Method for Flexural Toughness and First Crack Strength of Fiber Reinforced Concrete (Using Beam with Third-Point Loading), Book of ASTM Standards, Part 04.02 [33] British Standards Institute, Testing Sprayed Concrete: Determination of Energy Absorption Capacity of Fiber Reinforced Slab Specimens, BSI Standards, SN: BS EN 14488-5:2006. ISBN:0580482367 | ||
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