Experimental Study on Dynamic Mechanical Properties of Coal Gangue Concrete

Yao, Zhishu; Yu, Fanglin; Kong, Weihao; Huang, Xianwen; Wang, Xuesong

doi:10.1155/2020/8874191

Cited by 18 publications

(6 citation statements)

References 27 publications

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“…Consequently, the early compressive strength of specimens decreased, but the later strength gradually increased [69]. Yao et al [70] prepared concrete with different mixtures of coarse coal gangue (CCG) and fine coal gangue (FCG). In the early stage, the compressive strength of coal gangue concrete was lower than that of ordinary concrete.…”

Section: Mechanical Properties 421 Compressive Strengthmentioning

confidence: 99%

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue aggregate on concrete properties and the prediction model of gangue concrete, and summarizes the influence of modified materials on gangue concrete. The studies analyzed in this review show that different treatments influence the performance of coal gangue aggregate concrete. With the increase in the replacement ratio of coal gangue aggregate in concrete, the concrete workability and mechanical performance are reduced. Furthermore, the pore structure changes lead to decreased porosity, greatly affecting the durability. Coal gangue is not recommended for producing high-grade concretes. Nevertheless, pore structure can be improved by adding mineral admixtures, fibers, and admixtures to the coal gangue concrete. Hence, the working properties, mechanical properties, and durability of the concrete can be improved effectively, ensuring that coal gangue concrete meets engineering design requirements. Adding modified materials to coal gangue concrete is a viable future development direction.

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Section: Mechanical Properties 421 Compressive Strengthmentioning

confidence: 99%

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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“…The material uniformity or gradation can be analyzed based on the slope of the cumulative curve of the particle diameter. A steeper curve indicates that the sizes of the particles are almost the same, the particles are more uniform, and the gradation is poor, whereas a flat curve indicates that the size of particles is very different, the particles are uneven, and the grading is good (Cai et al, 2020;Wang et al, 2020c;Yao et al, 2020). According to the cumulative curve of the particle size, two quantitative indexes of the particle size distribution, C u (nonuniformity coefficient) and C c (curvature coefficient), can be determined as follows (Li et al, 2014):…”

Section: Theory Of the Continuous Gradation Of A Particle Distributionmentioning

confidence: 99%

Experimental Study on the Compaction and Deformation of Filling Gangue by Reducing Waste Gangue for Filling Mining

et al. 2021

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The coal mining technology of fully mechanized solid filling is an efficient and green mining method that integrates “sediment reduction” and “emission reduction.” However, the discharge of wasted gangue and surface subsidence are controlled by the amount of wasted gangue used in filling mining and the compaction rate of gangue filled into a goaf, respectively. To increase the consumption of wasted gangue and reduce surface subsidence, mixed gangue composed of equal-quality washed gangue and crushed gangue is proposed as a raw material for solid filling on the basis of gradation theory. Next, a screening experiment was performed to analyze the grain gradation of different specimens, and a compression experiment was executed to compare and analyze the compression characteristics. The results show that the nonuniformity coefficient of mixed gangue is 55.2 and the curvature coefficient is 1.53, which significantly improve the grain gradation of washed gangue. The degree of relative compaction of mixed gangue is 1.226, which is significantly lower than that of washed gangue, which is 1.33. The deformation modulus of mixed gangue is 23–135 MPa, which is better than that of washed gangue (26–100 MPa), indicating that the compressive resistance of mixed gangue is significantly improved. The case study of the Tangkou mine suggests that mixed gangue greatly promotes the consumption of wasted gangue and can effectively control the surface deformation.

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“…For the study on SCGA, Yang et al [5] analyzed the chemical and physical properties of SCGA and found that SCGA had significantly fewer harmful components and good volumetric stability compared with uncombusted gangue, which can be prepared into concrete for structural components. Yao et al [6,7] focused on the classification of SCGA and the mechanical properties of fresh concrete. Querol X et al [8] found that SCGA had significantly lower bulk and apparent densities and significantly higher water absorption and crushing index but still met the basic requirements of the specification for aggregate properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Flexural Performance of Spontaneous Combustion Gangue Coarse Aggregate Concrete Laminated Slab

et al. 2023

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(1) Background: to study the differences in flexural performance and failure characteristics of spontaneous combustion gangue coarse aggregate concrete (SCGAC) laminated slabs and ordinary concrete laminated slabs, comparative flexural performance tests of one ordinary concrete laminated slab and four spontaneous combustion gangue coarse aggregate concrete laminated slabs (SCGACLSs) full-scale specimens were carried out. (2) Methods: The loading method was four-point unidirectional static loading; the failure mode, load–deflection curve, load–reinforcement strain curve, and load–concrete strain curve of each specimen were analyzed. In addition, the load–deflection curve of the five slabs were predicted by ABAQUS. (3) Results: The five laminated slabs showed similar behaviors in terms of failure mode, load–strain curve, load–deflection curve, and deformation and all the properties satisfied the Chinese standard GB50010 (2010). Compared with ordinary concrete laminated slabs, the cracking load of SCGACLS with a precast layer of SCGAC(C30) decreased by 15.2% and the span deflection increased by 28.3% in the ultimate condition; however, when the strength grade of SCGAC of the precast layer was increased to SCGAC(C40), the cracking load increased by 7.8% and the span deflection was similar to that of the ordinary concrete laminated slabs. All specimens conformed to the planar section assumption. In addition, the finite element model (FEM) prediction results showed that the maximum relative errors of load and deflection were <5% and <10%, respectively, indicating that the established FEM had high prediction accuracy. (4) Conclusions: The defects of reduced load-carrying capacity and uncoordinated deformation caused by the different elastic modulus of precast and cast-in-place layer concrete can be compensated by appropriately increasing the strength grade of precast layer concrete of SCGACLSs. The application of SCGACLSs in structures is feasible.

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Experimental Study on Dynamic Mechanical Properties of Coal Gangue Concrete

Cited by 18 publications

References 27 publications

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Experimental Study on the Compaction and Deformation of Filling Gangue by Reducing Waste Gangue for Filling Mining

Experimental and Numerical Study of the Flexural Performance of Spontaneous Combustion Gangue Coarse Aggregate Concrete Laminated Slab

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