مهندسی سازه و ساخت

مهندسی سازه و ساخت

مطالعه آزمایشگاهی ورقه های پیش ساخته ی کامپوزیت سیمانی الیافی توانمند برای تقویت خمشی تیرهای بتن مسلح

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
2 استادیار، دانشکده فنی و مهندسی،گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
3 دانشیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
چکیده
از روش های پرکاربرد تقویت خمشی تیرهای بتن مسلح پل های موجود، استفاده از نصب المان تقویت کننده در قسمت زیرین تیر می باشد. در سال های اخیر علاوه بر استفاده از ورقه یا نوارهای پلیمری تقویت شده با الیاف و کاشت میلگرد در نزدیک سطح، تقویت تیر پل های بتنی با نصب ورقه‌های پیش‌ساخته ی کامپوزیت سیمانی الیافی توانمند در حال توسعه است. در تحقیق جاری علاوه بر بررسی مشخصات مکانیکی ورقه های کامپوزیت سیمانی، به تاثیر حضور میلگرد پلیمری در این ورقه ها نیز پرداخته شده است. 45 طرح اختلاط با تنوع در الیاف و مصالح مصرفی برای ساخت نمونه ها استفاده شد. برای مقایسه ی نتایج از آزمایش خمش چهارنقطه ای نمونه ها با ابعاد 25×125×500 و 25×125×1700 میلی متر، آزمایش خمش سه نقطه ای نمونه ها با ابعاد 40×40×160 میلی متر، آزمایش کشش مستقیم نمونه بریکت 8 شکل و آزمایش مقاومت فشاری نمونه مکعبی با ابعاد 40 میلی متر استفاده شد. . نتایج آزمایش کشش مستقیم نمونه های بریکت 8 شکل و آزمایش های مقاومت خمشی نمونه ها با ابعاد 25×125×500 و 40×40×160 میلیمتر به عنوان یک نوع آزمایش کشش غیرمستقیم، انطباق مناسبی دارند. سپس، مناسب ترین طرح انتخاب شد که شامل 8/1درصد الیاف فولادی میکرو و 5/0درصد الیاف پلی وینیل الکل، 42 کیلوگرم پودر کوارتز، 6/28 کیلوگرم ذرات کربنات کلسیم و 482 کیلوگرم دوغاب سیلیکا فیوم برای ساخت یک مترمکعب ملات است. برای نمونه ی منتخب، آزمایش کشش مستقیم نمونه دمبلی شکل و آزمایش مقاومت فشاری نمونه مکعبی با ابعاد 100 میلی متر انجام شد. افزودن پودر کوارتز در افزایش ظرفیت جذب انرژی نمونه های ورقه ای اثر مطلوبی دارد. استفاده از دو عدد میلگرد پلیمری با قطر 8 میلی‌متر، میزان تحمل تنش خمشی را 3/2 برابر افزایش داد. رفتار خمشی ورقه پیش‌ساخته تحت بارگذاری چرخه ای تفاوت چندانی نسبت به بارگذاری یکنواخت نشان نداد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental study of high performance fiber reinforced cementitious composite (HPFRCC) precast laminates for flexural strengthening of reinforced concrete beams

نویسندگان English

reza khaleghi 1
ahmad shokoohfar 2
Reza Farokhzad 2
mehrzad tahamouliRoudsari 3
1 PhD student, Technical and Engineering Faculty, Civil Engineering Department, Qazvin Branch, Islamic Azad University, Qazvin, Iran
2 Assistant Professor, Technical and Engineering Faculty, Civil Engineering Department, Qazvin Branch, Islamic Azad University, Qazvin, Iran
3 Associate Professor, Technical and Engineering Faculty, Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
چکیده English

One of the common techniques for enhancing the strength of existing reinforced concrete bridge beams involves adding reinforcing elements to the lower section of the beam. In the recent years, the reinforcement of concrete bridge beams is developing with the installation of precast high performance fiber reinforced cement composites, in addition to Fiber-Reinforced Polymer (FRP) sheets or strips and placed rebars near the surface. This study explores both the mechanical properties of composite cement laminates and how the presence of polymer rebars impacts these laminates. To create specimens, a total of 45 mixing designs were utilized, incorporating fibers and consumable materials. For comparison purposes, the specimens underwent various tests including four-point bending test with dimensions measuring 25×125×500 and 25×125×1700 mm, three-point bending test with dimensions measuring 40×40×160 mm, direct tension test on 8 shaped briquettes and compressive strength tests on cubic shapes measuring 40 mm. The results indicated good compliance with both direct tension and bending tests. After evaluation, the most suitable design was determined to consist of 1.8% micro steel fibers, 0.5% polyvinyl alcohol fibers, 42 kilograms of quartz powder, 28.6 kilograms calcium carbonate particles and 482 kilograms of silica fume slurry, per cubic meter of mortar. To analyze the chosen specimen, we conducted direct tension test on dogbone-shaped specimen and compressive strength test on cubic specimen measuring 100 millimeters. Adding quartz powder has a positive impact on enhancing the energy absorption capability of the laminate specimens. The use of two polymer rebars with a diameter of 8 millimeters lead to 2.3 times increase in the flexural stress tolerance. No significant difference was observed between the flexural behavior of the precast laminate under cyclic loading and the monotonic loading.

کلیدواژه‌ها English

HPFRCC
precasted laminate
GFRP rebar
stress-deflection curve
strain hardening
[1] Lin, W. and Yoda, T. (2017). Bridge engineering: classifications, design loading, and analysis methods. Butterworth-Heinemann.
[2] Zhang, Y. X., and Yu, K. (Eds.). (2022). Advances in Engineered Cementitious Composite: Materials, Structures, and Numerical Modeling. Woodhead Publishing, 294,418.
[3] Brandt, A. M. (2008). Fibre reinforced cement-based (FRC) composites after over 40 years of development in building and civil engineering. Composite structures86(1-3), 3-9.
[4] Naaman, A.E. and Reinhardt, H.W., 2004. High performance fiber reinforced cement composites HPFRCC-4: International workshop Ann Arbor, Michigan, June 16-18, 2003. Cement and Concrete Composites6(26), pp.757-759.
[5] Banar, R. and Dashti, P. and Zolfagharnasab, A. and Ramezanianpour, A. M. and Ramezanianpour, A. A. (2022). A comprehensive comparison between using silica fume in the forms of water slurry or blended cement in mortar/concrete. Journal of Building Engineering46, 103802.
[6] Wu, L. S. and Yu, Z. H., Zhang, C. and Bangi, T. (2022). Effect of CaCO3 whiskers on tensile properties of ultra-high-performance engineered cementitious composites. Journal of Building Engineering57, 104896.
[7] Cao, M. and Liu, Z. and Xie, C. (2020). Effect of steel-PVA hybrid fibers on compressive behavior of CaCO3 whiskers reinforced cement mortar. Journal of Building Engineering31, 101314.
[8] Cao, M. and Xie, C. and Guan, J. (2019). Fracture behavior of cement mortar reinforced by hybrid composite fiber consisting of CaCO3 whiskers and PVA-steel hybrid fibers. Composites Part A120, 172-187.
[9] Khan, M. and Cao, M. and Hussain, A. and Chu, S. H. (2021). Effect of silica-fume content on performance of CaCO3 whisker and basalt fiber at matrix interface in cement-based composites. Construction and Building Materials300, 124046.
[10] Gyawali, T. R. (2023). Effect of sand types and mixing procedures on the flexural behaviour of the high ductile mortar in monotonic and cyclic loadings. Heliyon9(3).
[11] Zeng, J. J. and Feng, P. and Dai, J. G. and Zhuge, Y. (2022). Development and behavior of novel FRP-UHPC tubular members. Engineering Structures266, 114540.
[12] Zhang, D. and Yu, J. and Wu, H. and Jaworska, B. and Ellis, B. R. and Li, V. C. (2020). Discontinuous micro-fibers as intrinsic reinforcement for ductile Engineered Cementitious Composites. Composites Part B: Engineering184, 107741.
[13] Bošnjak, J. and Sharma, A. and Grauf, K. (2019). Mechanical properties of concrete with steel and polypropylene fibres at elevated temperatures. fibers7(2), 9.
[14] Saheban Zand, S. (2012). Effect of vibration time on some mechanical properties of high strength steel fiber reinforced concrete (Doctoral dissertation, Eastern Mediterranean University (EMU)).
[15] Cao, Y. Y. Y. and Yu, Q. L. and Brouwers, H. J. H. and Chen, W. (2019). Predicting the rate effects on hooked-end fiber pullout performance from Ultra-High Performance Concrete (UHPC). Cement and Concrete Research120, 164-175.
[16] Kim, D. J. and Park, S. H. and Ryu, G. S. and Koh, K. T. (2011). Comparative flexural behavior of hybrid ultra high performance fiber reinforced concrete with different macro fibers. Construction and Building Materials25(11), 4144-4155.
[17] Wang, Z. and Liang, X. and Zhai, T. (2023, May). Predicting the flexural behavior of steel-PVA hybrid fiber reinforced cementitious composite. In Structures (Vol. 51, pp. 1189-1204). Elsevier.
[18] Wang, Z. and Sun, P. and Hu, Y. and Han, S. (2023). Crack morphology tailoring and permeability prediction of polyvinyl alcohol-steel hybrid fiber engineered cementitious composites. Journal of Cleaner Production383, 135335.
[19] Sridhar, R. (2022). Durability study on engineered cementitious composites with hybrid fibers under sulfate and chloride environments. Cleaner Materials5, 100121.
[20] Mercuri, M. and Vailati, M. and Gregori, A. (2023). Lime-based mortar reinforced with randomly oriented polyvinyl-alcohol (PVA) fibers for strengthening historical masonry structures. Developments in the Built Environment14, 100152.
[21] Betterman, L. R. and Ouyang, C. and Shah, S. P. (1995). Fiber-matrix interaction in microfiber-reinforced mortar. Advanced Cement Based Materials2(2), 53-61.
[22] Tan, G., Zhu, Z. and Wang, W. and He, X. (2022). A fractal-based approach for cracking characterization and whole process prediction exploration of PP fiber reinforced ECC containing sustainable ingredients. Construction and Building Materials318, 126015.
[23] Lin, J. X. and Song, Y. and Xie, Z. H. and Guo, Y. C. and Yuan, B. and Zeng, J. J. and Wei, X. (2020). Static and dynamic mechanical behavior of engineered cementitious composites with PP and PVA fibers. Journal of Building Engineering29, 101097.
[24] Ali, O. K. and Al-Hadithi, A. I. and Noaman, A. T. (2022). Flexural performance of layered PET fiber reinforced concrete beams. In Structures (Vol. 35, pp. 55-67). Elsevier.
[25] Vairagade, V. S. and Dhale, S. A. (2023). Hybrid fibre reinforced concrete–A state of the art review. Hybrid Advances, 100035.
[26] Ding, Y. and Yu, J. T. and Yu, K. Q. and Xu, S. L. (2018). Basic mechanical properties of ultra-high ductility cementitious composites: From 40 MPa to 120 MPa. Composite structures185, 634-645.
[27] Ganesh, P. and Murthy, A. R. (2021). Static and fatigue responses of retrofitted RC beams with GGBS based UHPC strips. Engineering Structures240, 112332.
[28] De Lorenzis, L. and Teng, J. G. (2007). Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures. Composites Part B: Engineering38(2), 119-143.
[29] Sabbaghian, M. and Kheyroddin, A. (2020). Flexural strengthening of RC one way slabs with high-performance fiber-reinforced cementitious composite laminates using steel and GFRP bar. Engineering Structures221, 111106.
[30] Lei, D. Y. and Guo, L. P. and Li, Y., Zheng, Z. and Liu, J. P. and Li, S. C. and Zhong, B. M. (2021). The investigating on mechanical properties of ultra-high strength and ultra-high ductility cementitious composites (UHS-UHDCC). Journal of Building Engineering43, 102486.
[31] Sabbaghian, M and Kheyroddin, A. (2019). Experimental Investigation of the Effect of Fiber on Mechanical and the Age Properties of High-Performance Fiber Reinforced Cement Composites. Concrete Research, 12(4), 53-68
[32] Fakharifar, M. and Dalvand, A. and Arezoumandi, M. and Sharbatdar, M. K. and Chen, G. and Kheyroddin, A. (2014). Mechanical properties of high performance fiber reinforced cementitious composites. Construction and building materials71, 510-520.
[33] Hesami, E. and Mostofinejad, D. and Eftekhar, M. R. (2019). Investigation of the Mechanical Properties of Ultra High Performance Concrete Unarmed and Armed with Steel fibers, Polypropylene and Polyvinyl alcohol. Concrete Research, 12(4), 18-5
[34] Kexin, Z. and Quansheng, S. (2016). Strengthening of a reinforced concrete bridge with polyurethane-cement composite (PUC). The Open Civil Engineering Journal10(1).
[35] Bitaraf, A. and Kheyroddin, A. and Sharbatdar, M. K. (2021). Flexural Strengthening of Continuous RC Beams Using HPFRCC Precast Laminates. Journal of Structural and Construction Engineering8(6), 221-240.
[36] Hemti, A and Ezzoddin, S. (2019). Behavior of reinforced concrete beam Strengthened by HPFRCC material. Concrete materials and structures, 4(1), 86-99
[37] Ehsani, R. and Sharbatdar, M. K. and Kheyroddin, A. (2022, January). ‘Estimation of the moment redistribution and plastic hinge characteristics in two span beams cast with high-performance fiber reinforced Cementinious composite (HPFRCC). In Structures (Vol. 35, pp. 1175-1190). Elsevier.
[38] Li, F., Wen, T., Li, J., Tang, H., Chen, Z., & Wu, H. (2022). Ultrasonic-detected damage and bending behavior of reinforced PP-ECC beams after coupled action of freeze-thaw cycles and constant flexural load. Case Studies in Construction Materials17, e01284.
[39] Chen, H. and Chen, Q. and Xu, Y. and Lawi, A. S. (2022). Effects of silica fume and Fly ash on properties of mortar reinforced with recycled-polypropylene. Construction and Building Materials316, 125887.
[40] Koksal, F. and Yıldırım, M. S. and Benli, A. and Gencel, O. (2021). Hybrid effect of micro-steel and basalt fibers on physico-mechanical properties and durability of mortars with silica fume. Case Studies in Construction Materials15, e00649.
[41] ASTM C305-13. (2013). Standard Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency. Annual Book of ASTM Standards, 188-190.
[42] Sujivorakul, C. and Muhummud, T. and Dokkhan, N. (2012). High Performance Light-Weight Cement Composite Plates Using Wastepaper Fibers and Wire Mesh. High Performance Fiber Reinforced Cement Composites 6: HPFRCC 6, 495-502. [43] Zhang, Q. and Yang, Q. C. and Li, W. J. and Gu, X. L. and Dai, H. H. (2023). Study on model of flexure response of carbon fiber textile reinforced concrete sheets with short AR-glass fibers. Case Studies in Construction Materials18, e01791.
[44] Li, W. and Zhao, J. and Huang, X. and Zheng, J. and Shi, T. and Shumuye, E. D. (2022). Mechanical properties of SAC-ECC reinforced with fiber-reinforced polymer mesh. Construction and Building Materials344, 128279.
[45] Toledo Filho, R. D. and de Andrade Silva, F. and Fairbairn, E. M. R. and de Almeida Melo Filho, J. (2009). Durability of compression molded sisal fiber reinforced mortar laminates. Construction and building materials23(6), 2409-2420.
[46] Tanarslan, H. M. (2017). Flexural strengthening of RC beams with prefabricated ultra high performance fibre reinforced concrete laminates. Engineering Structures151, 337-348.
[47] Wu, J. D. and Guo, L. P. and Cao, Y. Z. and Lyu, B. C. (2022). Mechanical and fiber/matrix interfacial behavior of ultra-high-strength and high-ductility cementitious composites incorporating waste glass powder. Cement and Concrete Composites126, 104371.
[48] Tanarslan, H. M. and Alver, N. İ. N. E. L. and Jahangiri, R. and Yalçınkaya, Ç. and Yazıcı, H. (2017). Flexural strengthening of RC beams using UHPFRC laminates: Bonding techniques and rebar addition. Construction and Building Materials155, 45-55.
[49] ASTM, A. (2007). C293/C293M–10: Standard Test Method for Flexural Strength of Concrete. American Society for Testing and Materials: West Conshohocken, PA, USA.
[50] Wu, Z. and Shi, C. and He, W. and Wu, L. (2016). Effects of steel fiber content and shape on mechanical properties of ultra high performance concrete. Construction and building materials103, 8-14.
[51] Li, J. and Yan, J. and Xue, G. and Niu, J. (2021). Acoustic emission behavior of polyvinyl alcohol (PVA) fiber reinforced calcium sulphoaluminate cement mortar under flexural load. Journal of Building Engineering40, 102734.
[52] Nalon, G. H. and Martins, R. O. G. and Alvarenga, R. D. C. S. S. A. and Lima, G. E. S. D. and Pedroti, L. G. and Santos, W. J. D. (2018). Effect of specimens' shape and size on the determination of compressive strength and deformability of cement-lime mortars. Materials Research20, 819-825.
[53] Kusumawardaningsih, Y. and Fehling, E. and Ismail, M. (2015). UHPC compressive strength test specimens: Cylinder or cube?. Procedia Engineering125, 1076-1080.
[54] Standard, B. (2009). Testing hardened concrete. Compressive Strength of Test Specimens, BS EN, 12390-3.
[55] AASHTO T132. (2000). Standard Method of Test for Tensile Strength of Hydraulic Cement Mortars. America Association of State Highway and Transportation Officials, Washington, DC.
[56] Shafieifar, M. and Farzad, M. and Azizinamini, A. (2017). Experimental and numerical study on mechanical properties of Ultra High Performance Concrete (UHPC). Construction and Building Materials156, 402-411.
[57] Rahdar, H. A.  and Ghalehnovi, M. (2016). Characteristics of UHPC and cracking behavior of tensile samples of reinforced concrete. Structural and construction engineering, 3(2), 42-58
[58] Valikhani, A. and Jaberi Jahromi, A. and Mantawy, I. M. and Azizinamini, A. (2020). Numerical modelling of concrete-to-UHPC bond strength. Materials13(6), 1379.
[59] Zhu, M. and Zhang, J. and Chen, B. and Wu, M. and Han, J. (2022). Numerical simulation of cost-effective green high-ductility engineered cementitious composites based on meso-scale particle flow model. Construction and Building Materials356, 128973.
[60] Lo Monte, F., & Ferrara, L. (2020). Tensile behaviour identification in Ultra-High Performance Fibre Reinforced Cementitious Composites: indirect tension tests and back analysis of flexural test results. Materials and Structures53, 1-12.
[61] Baktheer, A. and Chudoba, R. (2021). Experimental and theoretical evidence for the load sequence effect in the compressive fatigue behavior of concrete. Materials and Structures54(2), 82.
[62] Hajforoush, M. and Kheyroddin, A. and Rezaifar, O. (2020). Investigation of engineering properties of steel fiber reinforced concrete exposed to homogeneous magnetic field. Construction and Building Materials252, 119064.
[63] ASTM, A. (Reapproved 2008). C 666/C 666M – 03: Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing. American Society for Testing and Materials: West Conshohocken, PA, USA.

  • تاریخ دریافت 27 آبان 1402
  • تاریخ بازنگری 01 بهمن 1402
  • تاریخ پذیرش 26 اسفند 1402