The influence of coal gangue coarse aggregate on the mechanical properties of concrete columns

Liu, Hanqing; Bai, Guoliang; Gu, Yu; Yan, Fang

doi:10.1016/j.cscm.2022.e01315

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Xiao et al provided the optimized mix proportions of non-activated gangue for preparing building concrete [19]. According to Liu et al [20], the concrete columns made with gangue as coarse aggregates achieve sufficient adhesion to steel reinforcements. However, they do not prevent fracture propagation under high stress.…”

Section: Introductionmentioning

confidence: 99%

Preparing Shotcrete Materials Applied to Roadways Using Gangue Solid Wastes: Influences of Mix Proportions of Materials on the Mechanical Properties

Li,

Xing,

Zhao

et al. 2024

Applied Sciences

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Coal gangue is a waste product commonly produced during coal mining. Using gangue as a replacement for conventional aggregates in shotcrete applied to underground roadways is a feasible approach to promote the resource utilization of gangue solid waste. The mix proportions of shotcrete materials are crucial to the effectiveness of field applications. The aim of this study was to investigate the effects of mix proportions on the mechanical properties of the gangue-based shotcrete material applied to roadways. To achieve this, we conducted experiments to measure changes in the slump under different gangue sizes, mass concentrations, sand contents, and cement contents. The study analyzed the influences of various mix proportions on the conveying and mechanical properties of the gangue-based shotcrete material applied to roadways. The slump and the compressive strength were analysed. The following was concluded: (1) The gangue size and sand content have a similar effect on the slump. As the gangue size and sand content increase, the slurry slump initially decreases and then increases, which is attributed to the plasticity of the aggregates themselves. The mass concentration has a negative correlation with the slump, which is the least sensitive to changes in cement content. (2) The compressive strength of all specimens increases with prolonged curing, reaching its maximum after 28 d under the compressive experimental conditions. (3) This paper analyzed the reasons for better mechanical properties under the conditions of smaller size gangue, higher mass concentration, and higher cement content. It has also examined the reasons for greater compressive strength at 35% sand content. The experimental results of this paper also offer relevant guidance regarding the specific mix proportions of the material of the field gangue-based shotcrete material applied to roadways.

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Section: Introductionmentioning

confidence: 99%

Preparing Shotcrete Materials Applied to Roadways Using Gangue Solid Wastes: Influences of Mix Proportions of Materials on the Mechanical Properties

Li,

Xing,

Zhao

et al. 2024

Applied Sciences

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“…Excessive accumulation of coal gangue will cause serious environmental problems 2 – 4 . At present, the coal gangue is mainly used as concrete coarse aggregate or fine aggregate filling material, to ensure the performance of concrete under the premise of improving the recycling rate of coal gangue 5 – 8 . In addition, when it reaches a higher density, it has excellent engineering characteristics such as strong bearing capacity, high structural stability and less prone to excessive deformation 9 , combined with these characteristics, the use of gangue as a subgrade filler can effectively achieve the purpose of recycling.…”

Section: Introductionmentioning

confidence: 99%

Residual deformation of coal gangue subgrade filler under multi-vibration cyclic loading

Tang

Wan

Zhang

et al. 2023

Sci Rep

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In this paper, the development law of residual deformation of coal gangue subgrade filler is analyzed through large scale triaxial test, and the residual deformation model of coal gangue mainly sandstone and limestone is established. The purpose is to provide research basis for the applicability of coal gangue as subgrade filler. The results show that the deformation of coal gangue filler increases first and then tends to be constant under cyclic load of multiple vibration times. It is found that the Shenzhujiang residual deformation model cannot accurately predict the deformation law, and the corresponding modification is made to the residual deformation model of coal gangue filling body. Finally, according to the calculation of grey correlation degree, the influence degree of main factors of coal gangue filler on its residual deformation is sorted. Combined with the actual engineering situation represented by these main factors, it can be analyzed that the effect of packing particle density on residual deformation is greater than that of packing particle size composition.

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“…To make better use of coal gangue in concrete, it is necessary to add some materials into concrete to improve its performance. Fiber is widely used in construction, transportation, water conservancy, and other engineering fields due to its advantages of toughening and good crack resistance (Liu et al, 2022;Qiu et al, 2022). At present, the research of scholars has shifted from single-fiber concrete to hybrid-fiber concrete.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and microstructure of steel-polypropylene fiber coal gangue concrete

Li,

Chen,

Luo

et al. 2023

Front. Mater.

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Incorporating coal gangue into the concrete matrix can realize the utilization of solid waste and reduce the use of natural aggregate. To improve the mechanical properties of coal gangue concrete, this paper designs four-level and four-factor orthogonal tests with coal gangue ceramide substitution rate, coal gangue ceramide sand substitution rate, steel fiber content, and polypropylene fiber content as independent variables. Through multidimensional data analysis of the test results, The main and secondary factors of compressive strength of hybrid fiber coal gangue concrete from strong to weak are the replacement rate of coal gangue ceramic sand, the replacement rate of coal gangue ceramic grain, the content of steel fiber and the content of polypropylene fiber. The optimal content is 30% coal gangue ceramic particle, 25∼30% coal gangue ceramic sand, 0.75∼1% steel fiber, and 0.2% polypropylene fiber. The grey prediction model GM (1, 5) is obtained, which can predict the concrete strength well within the range selected in this paper. The influence of fiber and coal gangue on the microstructure was studied by scanning electron microscopy, and the influence law of interfacial transition zone on the strength of concrete was explored, which provided a theoretical basis for the study of solid waste utilization of coal gangue.

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The influence of coal gangue coarse aggregate on the mechanical properties of concrete columns

Cited by 6 publications

References 20 publications

Preparing Shotcrete Materials Applied to Roadways Using Gangue Solid Wastes: Influences of Mix Proportions of Materials on the Mechanical Properties

Preparing Shotcrete Materials Applied to Roadways Using Gangue Solid Wastes: Influences of Mix Proportions of Materials on the Mechanical Properties

Residual deformation of coal gangue subgrade filler under multi-vibration cyclic loading

Study on mechanical properties and microstructure of steel-polypropylene fiber coal gangue concrete

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