Enhanced strength and fracture features of tailings-based concrete reinforced with fibers and X-shaped rocks

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-03-14 DOI:10.1016/j.jmrt.2025.03.118
Meilin Jiang , Shuai Cao , Erol Yilmaz
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Abstract

The traditional room-and-pillar mining method benefits from the use of unclassified tailings-based concrete (UTC) to reinforce X-shaped broken pillars, offering advantages such as tailings utilization, reduced demand for sand aggregates, increased pillar strength, and improved stability of mined-out areas. This study investigates the influence of polypropylene (PP) fiber dosage (0 %, 0.3 %, 0.6 %, and 0.9 %) on the macro-strength and microstructure of fiber-reinforced UTC for reinforcing broken rock (F-UTCRR), and analyzes the toughening and crack resistance mechanisms of the fibers. Uniaxial compressive strength (UCS) test and SEM were employed to examine compressive and microstructural features of F-UTCRR. The results indicate that fiber dosage significantly affects the stress-strain behavior of F-UTCRR. As fiber content increases, both peak stress and strain first increase, then decrease, with the F-UTCRR-0.6 mixture exhibiting the highest compressive and deformation resistance, showing a 6.6 MPa rise in uniaxial strength and a 0.9 % rise in peak strain rate. At the macroscopic level, fiber concentration influences crack types, with the dominant crack pattern evolving from 'tension-tension-shear mixing-shear' as fiber content increases. The fibers primarily function through the bridging effect, inhibiting crack propagation. At the microscopic levels, fibers mainly compact the matrix and enhance the strength by bonding and interfacial friction behavior. Among the indexes in this paper, the performance advantage of F-UTCRR with 0.6 % fiber content is significant. Consequently, the findings of the research provide a theoretical foundation to explore strength and failure behavior of F-UTCRR, with significant practical implications for improving pillar damage resistance, extending pillar service life, maintaining roof plate stability in mining areas, and certifying employee/equipment's security.
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用纤维和 X 型岩石加固的尾矿混凝土的强度和断裂特性得到增强
使用未分类的尾矿基混凝土(UTC)加固 X 型破碎支柱,这种传统的房柱式采矿方法具有尾矿利用率高、砂石骨料需求量少、支柱强度高和采矿区稳定性好等优点。本研究探讨了聚丙烯(PP)纤维用量(0 %、0.3 %、0.6 % 和 0.9 %)对用于加固破碎岩石的纤维增强UTC(F-UTCRR)宏观强度和微观结构的影响,并分析了纤维的增韧和抗裂机理。采用单轴抗压强度(UCS)测试和扫描电镜研究了 F-UTCRR 的抗压和微观结构特征。结果表明,纤维用量对 F-UTCRR 的应力-应变行为有显著影响。随着纤维含量的增加,峰值应力和应变先增加后减小,其中 F-UTCRR-0.6 混合物的抗压和抗变形能力最强,单轴强度增加了 6.6 兆帕,峰值应变率增加了 0.9%。在宏观层面上,纤维浓度会影响裂纹类型,随着纤维含量的增加,主要裂纹模式会从 "拉伸-张力-剪切-混合-剪切 "演变而来。纤维主要通过桥接效应发挥作用,抑制裂纹扩展。在微观层面上,纤维主要通过粘结和界面摩擦行为压实基体并提高强度。在本文的各项指标中,纤维含量为 0.6% 的 F-UTCRR 性能优势显著。因此,研究结果为探讨 F-UTCRR 的强度和破坏行为提供了理论基础,对提高支柱抗破坏能力、延长支柱使用寿命、保持矿区顶板稳定性以及确保员工/设备安全具有重要的现实意义。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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