Mechanical properties of steel tubes filled with coal gangue concrete in a corrosive environment

IF 6.2 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

alexandria engineering journal Pub Date : 2025-05-03 DOI:10.1016/j.aej.2025.04.076

Tong Zhang , Qingru Zhu , Gao Shan

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Abstract

To achieve the in-situ utilization of coal gangue, coal gangue concrete filled steel tube (CGCFST) was applied in coal mine roadways as support structure. However, the reliability of the structure was negatively impacted by corrosive environment in coal mines. This study tested the axial compression performance of twenty-four circular CGCFST stubs with corrosion damage, considering the influence of coal gangue replacement rate and steel corrosion rate. The test results showed that the failure mode of the specimens was shear failure. The ultimate load, ductility, and stiffness of the CGCFST stub decreased with the increase of the corrosion rate and replacement rate, with corrosion rate having a more significant impact on the mechanical properties of the specimens. For the C30 CGCFST stub with a replacement rate of 100 %, when the corrosion rate is 30 %, the ultimate load, ductility, and stiffness of the CGCFST stub were reduced by 19.9 %, 48.8 %, and 27.3 %, respectively. Compared to high-strength concrete specimens, in addition to ductility, the effects of replacement rate and corrosion rate on the ultimate load and stiffness of low strength concrete were more significant. Finite element analysis was conducted to assess the impact of the steel ratio, material strength, and corrosion rate on the ultimate load of the CGCFST stub. The results indicated that concrete strength exerted the most significant influence on the ultimate load of the stub, suggesting that improving the strength of concrete is an effective strategy to ensure its safety. A design method for the ultimate load of CGCFST stubs in a corrosive environment was proposed. The CO₂ emission of CGCFST stubs was evaluated, suggesting to use concrete with high strength and natural aggregates completely replaced by coal gangue in practical engineering.

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煤矸石混凝土填充钢管在腐蚀环境中的力学性能

为实现煤矸石就地利用，将煤矸石钢管混凝土（CGCFST）作为支护结构应用于煤矿巷道。然而，煤矿腐蚀环境对结构的可靠性产生了负面影响。考虑煤矸石替换率和钢腐蚀速率的影响，对24根腐蚀损伤的CGCFST圆形桩进行轴压试验。试验结果表明，试件的破坏模式为剪切破坏。随着腐蚀速率和替换速率的增大，CGCFST桩的极限荷载、延性和刚度均呈下降趋势，且腐蚀速率对试件力学性能的影响更为显著。对于替换率为100 %的C30 CGCFST桩，当腐蚀速率为30 %时，CGCFST桩的极限荷载、延性和刚度分别降低19.9 %、48.8 %和27.3 %。与高强混凝土试件相比，除延性外，替换率和腐蚀率对低强度混凝土极限荷载和刚度的影响更为显著。通过有限元分析，评估了钢比、材料强度和腐蚀速率对CGCFST短节极限载荷的影响。结果表明，混凝土强度对桩身极限荷载的影响最为显著，表明提高混凝土强度是保证桩身安全的有效策略。提出了腐蚀环境下CGCFST桩的极限荷载设计方法。对CGCFST桩的CO2排放进行了评价，建议在实际工程中采用高强度天然骨料混凝土完全替代煤矸石。

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来源期刊

alexandria engineering journal Engineering-General Engineering

CiteScore

11.20

自引率

4.40%

发文量

1015

审稿时长

43 days

期刊介绍： Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering