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

Hao, Ying; Guo, Xiaoning; Yao, Xianhua; Han, Ruicong; Li, Lielie; Zhang, Min

doi:10.3390/ma15134495

Cited by 33 publications

(15 citation statements)

References 83 publications

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“…In addition, CG is also a good choice for filling concrete with coarse aggregate, which greatly reduces the cost of the grinding step. 41,75 Wang et al 76 developed a concrete material with higher water permeability replacing 30% gravel with CG, and the concrete can be applied for farmland drainage in high groundwater level areas. Except for the foamed concrete, pervious concretes with highly curvaceous pores were recently reported to realize a multilevel utilization.…”

Section: Cement-based Porous Materialsmentioning

confidence: 99%

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Fabrication and application of porous materials made from coal gangue: A review

Shao

Zheng

et al. 2023

Int J Applied Ceramic Tech

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Coal gangue (CG), which is mainly generated during coal excavation, mining, and coal washing, is an industrial solid waste that is recognized as an environmental pollutant. The ever‐increasing amount of CG produced is a serious threat to the ecological environment and property safety, especially in China, which is the largest coal producer and consumer in the world. Considerable studies have investigated means for utilizing CG worldwide. This review summarizes and discusses various porous inorganic materials made from CG, including cement‐based porous materials, porous bricks, porous ceramics (cordierite and mullite) and glasses, porous geopolymers, zeolites, aerogels, and porous carbon materials. Different preparation processes and performances of each type of porous inorganic materials were reviewed. Porous CG‐based materials can be used as promising adsorbents for the removal of various pollutants and have good potential for use in construction industry as well as catalyst material applications. Besides, porous materials obtained from CG have also been tested as slow‐release fertilizers after the absorption of phosphate, as electrode materials, and as oil‐in‐water separation agents. The systematic summary of porous materials based on CG aims at promoting high‐value‐added applications for this waste. Future research directions for the use of CG as a raw material are also presented.

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Section: Cement-based Porous Materialsmentioning

confidence: 99%

“…In addition, CG is also a good choice for filling concrete with coarse aggregate, which greatly reduces the cost of the grinding step 41,75 . Wang et al 76 .…”

Section: Porous Materials Made From Coal Ganguementioning

confidence: 99%

Fabrication and application of porous materials made from coal gangue: A review

Shao

Zheng

et al. 2023

Int J Applied Ceramic Tech

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“…Spontaneous combustion coal gangue (SCCG) has a good reactivity and has been widely used as an active blending material in cement production [ 7 , 8 , 9 , 10 , 11 ]. However, SCCG resources are limited, and most of the coal gangue stored in mining areas are non-spontaneous combustion coal gangues (NSCCGs).…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Improving Activity of Calcinated Coal Gangue via Increasing Calcium Content

Zhao

Zhang

et al. 2023

Materials

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In this investigation, non-spontaneous combustion coal gangue was activated by two methods: (1) low-temperature calcination and (2) calcium addition. Differences in the activity of the activated coal gangue were studied at various calcination temperatures and amounts of calcium addition. Meanwhile, the cementation activity of the activated coal gangue was evaluated according to the activity effect analysis. Furthermore, the influences of the activated coal gangue on the cementation activity of cement were investigated. The results indicated that the activities of the activated coal gangue increased at a temperature between 500 °C and 700 °C. The calcium addition method can also increase the activity of coal gangue, with the effect being better when the gangue is mixed with slag. The addition of calcium and the calcination of coal gangue can promote the production of active minerals such as metakaolin, which is the main reason for the increased cementation activity.

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“…Coal gangue is solid waste generated from coal excavating and processing. In China, deposited coal gangue amounts to about 7 billion tons and increases at a rate of 200–350 million tons per year, leading to vast land occupation and severe environmental pollution in mines [ 1 , 2 , 3 ]. Thus, the eco-friendly utilization of coal gangue becomes an urgent issue.…”

Section: Introductionmentioning

confidence: 99%

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

Xia

et al. 2023

Materials

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Recycling coal gangue as aggregate to produce concrete in situ is the most effective way to solve the problem of deposited coal gangue in mines. Nevertheless, the mine environment underground is rich in sulfate ions, posing a threat to the durability of coal gangue concrete (CGC). Hence, the degradation process of sulfate-attacked CGC is investigated. A series of tests is performed to evaluate its variation law of mass, dynamic elastic modulus, compressive strength and sulfate ion distribution. Meanwhile, the microstructure and phases of sulfate-attacked CGC are identified by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis. The results indicate that the residual compressive strength ratio of CGC is higher than that of normal concrete after a 240 d sulfate attack, implying a superior sulfate resistance for CGC. Additionally, the higher the sulfate concentration, the more severe the degradation. Except for the secondary hydration of CGC itself, the diffused sulfate ions also react with Ca(OH)2, forming gypsum and ettringite; this plays a positive role in filling the pores at the early stage, whereas, at the later stage, the generated micro-cracks are detrimental to the performance of CGC. In particular, the proposed sulfate corrosion model elucidates the degradation mechanism of CGC exposed to a sulfate-rich environment.

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

Cited by 33 publications

References 83 publications

Fabrication and application of porous materials made from coal gangue: A review

Fabrication and application of porous materials made from coal gangue: A review

Experimental Research on Improving Activity of Calcinated Coal Gangue via Increasing Calcium Content

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

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