Research on Basic Mechanical Properties and Fracture Damage of Coal Gangue Concrete Subjected to Freeze‐Thaw Cycles

Huang, Min; Duan, Jingmin; Wang, Jiakai

doi:10.1155/2021/6701628

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…It shows that the more the coal gangue content, the smaller the energy required for crack damage propagation. Based on the stress intensity factor, the initial fracture toughness and unstable fracture toughness in the fracture parameters are calculated [25], as shown in Figure 20. As observed, both parameters decreased with the increase in the gangue content in concrete specimens.…”

Section: Analysis Of the Damage And Fracture Evolution Processmentioning

confidence: 99%

Crack Propagation Phenomenon in Gangue Concrete Using the Digital Image Correlation (DIC) Method

Pan,

Zheng,

Yang

2024

Advances in Materials Science and Engineering

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In order to study the mode I crack propagation mechanism of coal gangue concrete with different contents, the digital image correlation (DIC) method was used to carry out the three-point bending fracture tests on coal gangue concrete with different contents. The results show that the process of the mode I crack propagation of coal gangue concrete with different contents can be divided into three stages as follows: the elastic stage before crack initiation, extended viscoelastic stage, and extended fracture stage. The amount of coal gangue has a significant impact on the crack propagation path. The more the amount of coal gangue, the more the crack penetrates through the coal gangue coarse aggregate, the smaller the bending degree of the failure path, and the faster the crack propagation to the penetration speed. The crack initiation load, ultimate load, external force work, gravity work, and fracture energy all decrease with the increase of the coal gangue content. The data obtained by the DIC method and displacement extensometer are in good agreement, which proves that the DIC method is feasible. Based on the DIC method, before reaching the horizontal displacement on both sides of the crack tip, the horizontal displacement of the horizontal pixel is very small and there is a jump increase after the ultimate load. There are obvious inflection points on the left and right, and the horizontal displacement remains unchanged after the inflection point. After the horizontal displacement field of crack propagation reaches the limit load, there is an obvious limit; the limit gradually extends upward, and the corresponding crack tip strain field is also gradually enhanced. The more the coal gangue is added, the smaller the corresponding horizontal displacement and strain field is at the same limit load moment. The shape of the crack generation area of coal gangue concrete takes the crack tip as the axis of symmetry and is “gourd shaped.” The more the content of the crack, the larger the crack generation area.

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Section: Analysis Of the Damage And Fracture Evolution Processmentioning

confidence: 99%

Crack Propagation Phenomenon in Gangue Concrete Using the Digital Image Correlation (DIC) Method

Pan,

Zheng,

Yang

2024

Advances in Materials Science and Engineering

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“…The decline is more prominent with the increase in the coal gangue replacement ratio, which indicates that freeze-thaw causes serious damage to the interior of coal gangue concrete [80,81]. The relationship between freeze-thawing times (x) and the fracture toughness and fracture energy damage of coal gangue concrete after the freezing-thawing cycles could be fitted with the function y = ax b [82]. Table 4 shows the fitting coefficient under different gangue replacement ratios.…”

Section: Freezing Resistancementioning

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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“…Zhao et al [7] proposed that coal gangue can be employed as a primary cementitious material after being modified by an activation method. Huang et al [8] investigated the effect of the coal gangue replacement ratio as the coarse aggregate on the concrete properties of concrete subjected to freeze-and-thaw cycles. Abichou et al [9] pointed out that crushed coal gangue can be partly or entirely used as a fine aggregate in concrete.…”

Section: Introductionmentioning

confidence: 99%

Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue

et al. 2022

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The feasibility of modified tabia (MT) with composite-activated coal gangue (CACG) as the subgrade material of low-grade highways was experimentally investigated. A composite activation method was employed to improve the pozzolanic activity of coal gangue. The effect of CACG content on the mechanical properties of MT was investigated through a series of experiments. It was found that the pozzolanic reactivity of coal gangue was remarkably enhanced by the composite activation method. Compared with traditional tabia (TT), the unconfined compressive strength, splitting strength, and flexural tensile strength of the MT with 50% of CACG content increased by 5.03 times, 9.71 times, and 1.50 times, respectively. The impermeability of specimens with CACG significantly improved. Furthermore, the mass loss rate of MT was less than 2.83%, while it reached up to 34.20% in TT after being conditioned to 40 freeze–thaw cycles. Finally, the microstructure change and hydration mechanism of MT are discussed and revealed.

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Research on Basic Mechanical Properties and Fracture Damage of Coal Gangue Concrete Subjected to Freeze‐Thaw Cycles

Cited by 11 publications

References 8 publications

Crack Propagation Phenomenon in Gangue Concrete Using the Digital Image Correlation (DIC) Method

Crack Propagation Phenomenon in Gangue Concrete Using the Digital Image Correlation (DIC) Method

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

Performance and Hydration Mechanism of Modified Tabia with Composite-Activated Coal Gangue

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