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Article

Flexural Behavior of Innovative Glass Fiber-Reinforced Composite Beams Reinforced with Gypsum-Based Composites

Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212000, China
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Author to whom correspondence should be addressed.
Polymers 2024, 16(23), 3327; https://doi.org/10.3390/polym16233327
Submission received: 31 October 2024 / Revised: 23 November 2024 / Accepted: 25 November 2024 / Published: 27 November 2024
(This article belongs to the Special Issue Application and Characterization of Polymer Composites)

Abstract

Glass Fiber-Reinforced Composite (GFRP) has found widespread use in engineering structures due to its lightweight construction, high strength, and design flexibility. However, pure GFRP beams exhibit weaknesses in terms of stiffness, stability, and local compressive strength, which compromise their bending properties. In addressing these limitations, this study introduces innovative square GFRP beams infused with gypsum-based composites (GBIGCs). Comprehensive experiments and theoretical analyses have been conducted to explore their manufacturing process and bending characteristics. Initially, four types of GBIGC—namely, hollow GFRP beams, pure gypsum, steel-reinforced gypsum, and fiber-mixed gypsum-infused beams—were designed and fabricated for comparative analysis. Material tests were conducted to assess the coagulation characteristics of gypsum and its mechanical performance influenced by polyvinyl acetate fibers (PVAs). Subsequently, eight GFRP square beams (length: 1.5 m, section size: 150 mm × 150 mm) infused with different gypsum-based composites underwent four-point bending tests to determine their ultimate bending capacity and deflection patterns. The findings revealed that a 0.12% dosage of protein retarder effectively extends the coagulation time of gypsum, making it suitable for specimen preparation, with initial and final setting times of 113 min and 135 min, respectively. The ultimate bending load of PVA-mixed gypsum-infused GFRP beams is 203.84% higher than that of hollow beams, followed by pure gypsum and steel-reinforced gypsum, with increased values of 136.97% and 186.91%, respectively. The ultimate load values from the theoretical and experimental results showed good agreement, with an error within 7.68%. These three types of GBIGCs with significantly enhanced flexural performance can be filled with different materials to meet specific load-bearing requirements for various scenarios. Their improved flexural strength and lightweight characteristics make GBIGCs well suited for applications such as repairing roof beams, light prefabricated frames, coastal and offshore buildings.
Keywords: gypsum; polyvinyl acetate fibers; GFRP; composite beams; coagulation characteristics gypsum; polyvinyl acetate fibers; GFRP; composite beams; coagulation characteristics

Share and Cite

MDPI and ACS Style

Liu, Y.; Su, B.; Zhang, T. Flexural Behavior of Innovative Glass Fiber-Reinforced Composite Beams Reinforced with Gypsum-Based Composites. Polymers 2024, 16, 3327. https://doi.org/10.3390/polym16233327

AMA Style

Liu Y, Su B, Zhang T. Flexural Behavior of Innovative Glass Fiber-Reinforced Composite Beams Reinforced with Gypsum-Based Composites. Polymers. 2024; 16(23):3327. https://doi.org/10.3390/polym16233327

Chicago/Turabian Style

Liu, Yiwen, Bo Su, and Tianyu Zhang. 2024. "Flexural Behavior of Innovative Glass Fiber-Reinforced Composite Beams Reinforced with Gypsum-Based Composites" Polymers 16, no. 23: 3327. https://doi.org/10.3390/polym16233327

APA Style

Liu, Y., Su, B., & Zhang, T. (2024). Flexural Behavior of Innovative Glass Fiber-Reinforced Composite Beams Reinforced with Gypsum-Based Composites. Polymers, 16(23), 3327. https://doi.org/10.3390/polym16233327

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