Investigation of flexural behaviour of the damaged reinforced concrete beam strengthened by MPC pasting glass fiber reinforced textile

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-07-14 DOI:10.1617/s11527-025-02727-5

Xiaoqing Chen, Hongfa Yu, Haoxia Ma, Xiang Yao, Haotian Fan, Qian Du

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引用次数: 0

Abstract

With the extension of building service life and the erosion of various environments, the demand for building reinforcement is increasing. This study aims to investigate the flexural performance of reinforced concrete (RC) beams strengthened with magnesium phosphate cement (MPC) combined with glass fiber-reinforced textile (GFRT). Through experiments and analysis, the study examined the flexural capacity, midspan deflection, crack development, and failure modes of RC beams with different concrete strength grades (including coral aggregate RC beams, basic magnesium sulfate RC beams (BMRCB), and ordinary Portland RC beams) before and after strengthening. The results show that the MPC-GFRT strengthening significantly increased the crack moment of the beams, with enhancements ranging from 125.0 to 200.0%, and the low-strength concrete beams exhibited more pronounced increases. The ultimate bending moment recovery rate was between 86.9 and 102.2%, indicating that the MPC-GFRT strengthening effectively restored the flexural performance of the damaged beams. In addition, the study optimized the calculation models for the short-term stiffness and ultimate flexural capacity of the strengthened beams, further verifying the feasibility of using MPC instead of epoxy resin adhesive for concrete reinforcement.

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MPC粘贴玻璃纤维增强纺织品加固损伤钢筋混凝土梁的受弯性能研究

随着建筑使用寿命的延长和各种环境的侵蚀，对建筑加固的需求越来越大。本研究旨在探讨磷酸镁水泥（MPC）与玻璃纤维增强纺织品（GFRT）复合加固的钢筋混凝土（RC）梁的抗弯性能。通过试验和分析，研究了不同混凝土强度等级的钢筋混凝土梁（包括珊瑚骨料钢筋混凝土梁、碱性硫酸镁钢筋混凝土梁和普通波特兰钢筋混凝土梁）加固前后的抗弯能力、跨中挠度、裂缝发展和破坏模式。结果表明：MPC-GFRT加固显著提高了梁的裂缝弯矩，增强幅度在125.0 ~ 200.0%之间，低强度混凝土梁的增强幅度更为明显；极限弯矩恢复率在86.9 ~ 102.2%之间，表明MPC-GFRT加固有效恢复了损伤梁的抗弯性能。此外，本研究还对加固梁的短期刚度和极限抗弯承载力计算模型进行了优化，进一步验证了用MPC代替环氧树脂胶粘剂加固混凝土的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.