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FRP约束煤矸石混凝土轴压性能及细观结构演化研究

Study on axial compressive behavior and mesoscopic structural evolution of FRP confined coal gangue concrete.

作者信息

Li Qingwen, Xu Mengjiao, Pan Chuangchuang, Zhang Lei, Zhong Yuqi, Li Wenxia, Gu Shuhan, Yu Mengmeng

机构信息

School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou, China.

China Building Materials Industry Geologic Exploration Center Liaoning Branch, Shenyang, China.

出版信息

PLoS One. 2025 May 9;20(5):e0322647. doi: 10.1371/journal.pone.0322647. eCollection 2025.

DOI:10.1371/journal.pone.0322647
PMID:40344156
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12064029/
Abstract

To address the environmental hazards caused by coal gangue waste, coal gangue concrete (CGC) has been proposed as a solution. However, due to its porosity and low strength, CGC faces numerous challenges in practical applications. To further improve its performance, fiber reinforced polymer (FRP) material was introduced to confine it. In this study, the PFC3D-FLAC3D coupling analysis method was employed to simulate the uniaxial compression test of FRP confined coal gangue concrete specimens. The influence of different FRP types (GFRP, CFRP, BFRP) and coal gangue replacement rates (0%, 50%, 100%) on the axial compression performance of coal gangue concrete columns was analyzed. Based on the indoor uniaxial compression test of glass fiber reinforced polymer (GFRP) confined coal gangue concrete, the modeling and calibration of coal gangue concrete columns confined by different FRP sheets were conducted. The strength variation and microstructure evolution mechanism of coal gangue concrete specimens confined by three kinds of FRP were discussed. The results indicated that the numerical model is highly accurate and consistent with existing experiments. The type of FRP significantly influences the confinement effect on coal gangue concrete specimens. As the coal gangue replacement rate increases, both the strength and elastic modulus of the specimens decrease. The difference of the spatial distribution of strong contact number and strong contact force reflect the microscopic manifestation of the macroscopic strength. The crack evolution of FRP confined coal gangue concrete went through three stages during uniaxial compression. This study is of great significance for selecting the appropriate type of FRP confinement for concrete under different coal gangue replacement rates.

摘要

为应对煤矸石废弃物造成的环境危害，煤矸石混凝土（CGC）被提出作为一种解决方案。然而，由于其孔隙率和低强度，煤矸石混凝土在实际应用中面临诸多挑战。为进一步提高其性能，引入了纤维增强聚合物（FRP）材料对其进行约束。在本研究中，采用PFC3D - FLAC3D耦合分析方法模拟纤维增强聚合物约束煤矸石混凝土试件的单轴压缩试验。分析了不同纤维增强聚合物类型（玻璃纤维增强聚合物（GFRP）、碳纤维增强聚合物（CFRP）、玄武岩纤维增强聚合物（BFRP））和煤矸石替代率（0%、50%、100%）对煤矸石混凝土柱轴向压缩性能的影响。基于玻璃纤维增强聚合物（GFRP）约束煤矸石混凝土的室内单轴压缩试验，对不同纤维增强聚合物板约束的煤矸石混凝土柱进行了建模和校准。探讨了三种纤维增强聚合物约束煤矸石混凝土试件的强度变化及微观结构演化机理。结果表明，数值模型具有较高的精度且与现有试验结果一致。纤维增强聚合物的类型对煤矸石混凝土试件的约束效果有显著影响。随着煤矸石替代率的增加，试件的强度和弹性模量均降低。强接触数和强接触力空间分布的差异反映了宏观强度的微观表现。纤维增强聚合物约束煤矸石混凝土在单轴压缩过程中的裂纹演化经历了三个阶段。本研究对于在不同煤矸石替代率下为混凝土选择合适类型的纤维增强聚合物约束具有重要意义。

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