Experimental research on shear strength of geopolymer concrete beams reinforced with steel and GFRP bars
Email:
thuychi.dang@utc.edu.vn
Keywords:
shear strength, geopolymer concrete, without stirrups, glass fiber reinforced polymer (GFRP).
Abstract
The combination of GFRP reinforcement with geopolymer concrete (GPC) presents a promising solution, as it amalgamates the sustainability and durability of GPC with the corrosion resistance and strength of GFRP reinforcement. A comprehensive understanding of the shear strength and failure mechanisms of geopolymer reinforced concrete beams and GFRP bars is essential for structural design. This study evaluated the shear behavior of geopolymer concrete beams reinforced steel and GFRP bars, focusing on the shear failure mechanism, shear strength and shear crack width. A set of four beams was fabricated, two of which were geopolymer concrete beams reinforced with GFRP bars and two were reinforced with steel bars. Experimental results showed that the use of GFRP bars significantly reduced the shear strength of the beams, which was about 30-40% lower than that of steel beams. The very low modulus of elasticity of GFRP bars also increased the deflection at failure of the structure. The geopolymer concrete beams had up to 50% narrower shear crack widths and 30% smaller deflections than the GFRP beams.References
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[3]. Ahmed. Azzam, Guo. Shuaicheng, Zhang. Zuhua, Shi. Caijun, Zhu. Deju, A review on durability of fiber reinforced polymer (FRP) bars reinforced seawater sea sand concrete, Construction and Building Materials, 256 (2020) 119484. https://doi.org/10.1016/j.conbuildmat.2020.119484
[4]. Zhang. Bai, Zhu. Hong, Cao. Ruiming, Ding. Jianming, Chen. Xianhua, Feasibility of using geopolymers to investigate the bond behavior of FRP bars in seawater sea-sand concrete, Construction and Building Materials, 282 (2021) 122636.
doi: https://doi.org/10.1016/j.conbuildmat.2021.122636
[5]. Chen. Hui, Yi. Wei-Jian, Ma. Zhongguo John, Hwang. Hyeon-Jong, Modeling of shear mechanisms and strength of concrete deep beams reinforced with FRP bars, Composite Structures, 234 (2020) 111715. https://doi.org/10.1016/j.compstruct.2019.111715
[6]. D.M.J. Sumajouw, B.V. Rangan, Low-Calcium Fly Ash-Based Geopolymer Concrete: Reinforced Beams and Columns., Research Report GC 3, Faculty of Engineering, Curtin University of Technology Perth, Australia, 2006.
[7]. Fan. Xiaochun, Zhou. Zhengrong, Tu. Wenlin, Zhang. Mingzhong, Shear behaviour of inorganic polymer concrete beams reinforced with basalt FRP bars and stirrups, Composite Structures, 255 (2021) 112901. https://doi.org/10.1016/j.compstruct.2020.112901
[8]. Tran. Ngoc Linh, Shear model mSM-c for slender reinforced concrete members without shear reinforcement subjected to fatigue loads, Engineering Structures, 233 (2021) 111886. https://doi.org/10.1016/j.engstruct.2021.111886
[9]. J.R. Yost, A. Radlinska, S. Ernst, M. Salera, N.J. Martignetti, Structural behavior of alkali activated fly ash concrete, Part 2: Structural testing and experimental findings, Materials and Structures, 46 (2013) 449–462.
[10]. R. Mourougane, C.G. Puttappa, C. Sashidhar, K.U. Muthu, Shear behaviour of high strength GPC/TVC beams, Proceedings of International Conference on Advances in Architecture and Civil Engineering, Bangalore, India, (2012) 142–145.
[11]. E.H. Chang, Shear and bond behaviour of reinforced fly ash-based geopolymer concrete beams (Ph.D. thesis), Curtin University of Technology, Australia, 2009.
[12]. Ng. T.S., S.J. Foster, A. Amin, The behaviour of steel-fibre-reinforced geopolymer concrete beams in shear, Magazine of Concrete Research, 65 (2013) 308–318.
[13]. Ng. T.S., S.J. Foster, Shear strength of lightweight fibre reinforced geopolymer concrete composite beam, In Incorporating Sustainable Practice in Mechanics of Structures and Materials, 2011, Taylor & Francis Group, London.
[14]. TCVN 10302-2014, Phụ gia hoạt tính tro bay dùng cho bê tông, vữa xây và xi măng, 2014.
[15]. TCVN 11586-2016, Xỉ hạt lò cao nghiền mịn dùng cho bê tông và vữa, 2016.
[16]. Đặng Thùy Chi, Nghiên cứu chế tạo bê tông geopolyme sử dụng chất hoạt hóa một thành phần và cát biển, Tạp chí Giao thông vận tải, 741 (2024) 94-97.
[17]. ASTM C39/39M-21, Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens, 2021.
[18]. ASTM C469/469M-22, Standard Test Method for Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression, 2022.
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Received
06/03/2025
Revised
11/04/2025
Accepted
12/04/2025
Published
15/04/2025
Type
Research Article
How to Cite
Đặng Thùy, C. (1744650000). Experimental research on shear strength of geopolymer concrete beams reinforced with steel and GFRP bars. Transport and Communications Science Journal, 76(3), 348-360. https://doi.org/10.47869/tcsj.76.3.12
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