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6 rowsCoal gangue is a by-product generated from coal mining and washing. Using coal gangue as ...
In recent years, with the rapid development of the coal-mining industry, the output of gangue has increased at a faster pace, while its utilization remains relatively low. The accumulation of a large amount of gangue has brought about a large environmental problem. In order to improve the utilization rate of waste gangue, and to solve the …
The particles surface of coal gangue was fragmental and flake deposit with irregular shape and uneven fold morphology. It was easy to be bonded with the surface of other filling material. The hydration products of coal gangue cementitious material were a large number of C-S-H gel with fibrous shape and ettringite (AFt) with compact block …
In general, as coal gangue is actually a transition substance between rock and coal, its chemical composition is similar to that of natural coarse aggregate, which …
Coal gangue is the carbonaceous rock discharged from the coal production process and one of the industrial solid wastes with the largest discharge in China. At present in China, the total storage of gangue is more than 7 billion tons, and the accumulation of gangue occupies a large amount of land resources.
In general, as coal gangue is actually a transition substance between rock and coal, its chemical composition is similar to that of natural coarse aggregate, which also confirms the feasibility of being a coarse …
Bulk gangue is a common backfill material in solid backfill mining. After backfilling into the goaf, bulk gangue serves as the main body to bear the load of overlying strata, and its deformation resistance is the key factor affecting the backfill quality. In …
Coal gangue is a waste that is largely produced during coal mining. Its massive accumulation has caused great damage to the environment. In order to promote the resource utilization of coal...
Among the techniques for converting stacked coal gangue to reusable material, one of the most effective ways is to use coal gangue as a coarse aggregate in green concrete productions. The physical and chemical properties of rock and spontaneous-combustion coal gangue are generally suitable for being used as a coarse aggregate in …
Coal gangue is a by-product in the coal mining process with a wide range of application. Understanding the geotechnical behavior of coal gangue (CG) and its interaction with sensitive and problematic soils provides viable solutions for its large-scale utilization. Bulk utilization of CG can be attained if it has the potential for subgrade material.
In this paper, coal gangue is utilized as a replacement of coarse aggregate in structural concrete. The effects of coal gangue on the mechanical properties of concrete material, circular reinforced concrete column and concrete-filled steel tubular column are experimentally studied and discussed in detail.
Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1, 2, 3. Generally, one ton of CG is discarded for every 10 tons of produced...
The physical and chemical properties of rock and spontaneous-combustion coal gangue are generally suitable for being used as a coarse aggregate in green …
The coarse aggregate used in this study was partly limestone, the average particle size of which was 5 mm–15 mm, the parameters shown in Table 3, and partly non-spontaneous combustion sandstone gangue produced in a mine in Shanxi province, China. The results of gangue specimens in the XRD scanning analysis are shown in Figure 2 …
When crushing coal gangue, it should go through three processes of "coarse-middle-fine crushing". Roll crusher 2. Grinding and maintaining frequently The surface of the roll crusher is easily worn to …
The results show that (1) it is feasible that employing coal gangue to replace natural coarse and fine aggregates in concrete can prepare C30 and C40 concrete; (2) the addition of coal gangue fine aggregate has a …
Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1, 2, 3. Generally, one ton of CG is discarded …
Owing to the similarity between coal gangue and natural aggregates, concrete preparation from coal gangue has been considered effective for solving gangue problems. In this study, to further improve the on-site utilisation rate of coal gangue, coal gangue was used to replace fine and coarse aggregates for preparing mortar and concrete.
When crushing coal gangue, it should go through three processes of "coarse-middle-fine crushing". Roll crusher. 2. Grinding and maintaining frequently. The surface of the roll crusher is easily worn to …
Coal gangue contains a small amount of Mn, Cu, Zn, Ti, Ba, Cl, and other elements. After weathering, the contents of each element were reduced. (3) Under the same conditions, a higher number of heavy metal elements …
Coal gangue is a solid waste generated during coal mining. It not only occupies large areas of land, but also causes significant …
Coal gangue is one of the solid waste materials produced during the production and processing of coal. By 2022, the accumulated amount of coal gangue stockpiles in China reached over 5 billion tons, covering 12,000 ha. It is estimated that it will further increase by 300 million tons per year [15].
The gangue specimens of the three coal seam Nos. 14, 15, and 16 with the different lithologies: coal-roof muddy siltstone, coal-roof muddy siltstone, and coal-roof medium-grained coarse sandstone, respectively, were ground into a 200-mesh powder and subjected to SEM experiments using a Japanese 10 kV test voltage SEU8010 …
Coal gangue is a by-product generated from coal mining and washing. Using coal gangue as aggregate is an effective approach of valorization this high-volume …
Properties of steel fiber reinforced coal gangue coarse aggregate concrete Wang, Zhenshuang; Zhao, Ning Wuhan University Journal of Natural Sciences, Volume 19 (3) – Jun 1, 2014 Read Article Download PDF Share Full Text for Free 7 pages Article Details Recommended References Bookmark Add to Folder Cite Social Times Cited: …
Coal gangue concrete (CGC) refers to the concrete produced by using coal gangue discharged from coal mining as coarse aggregate, partially or completely …
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 ].
Coal gangue, which is the solid waste produced during the coal processing, causes serious environmental problems. Lightweight concrete by making use of the coal-gangue ceramsite as the aggregate has many advantages as the construction material.
The physical and mechanical properties of coal gangue is notable different from natural aggregate, which results in the different compressive behavior in coal gangue concrete. The porous nature, high absorption, high crushing values, and fragility of this aggregate led to a poor working performance in comparison to ordinary concrete.
The coarse and fine aggregate replacement rate of coal gangue is 0, 30%, 60%, , respectively. Table 2 provides the mixture proportions of concrete samples. C 0 M 0 S 0 is the control group of ordinary concretes with the aggregate replacement rate of coal gangue being 0.
Coal gangue, as a type of solid waste discharged during coal mining and coal washing, occupies a large amount of land resources owing to accumulated gangue, which eventually results in...
Along with the excavation and washing of coal in the production process, large amounts of rock-like coal gangue (CG) accompanying the carboniferous beds are discharged as industrial residues, accounting for around 10–20% of the coal production [2,3,4].In the largest coal production country, namely China, more than 700 million tons …
Based on the data of the workability of fresh concrete, mechanical properties and durability of hardened concrete, the concrete cost index system are established to evaluate and optimize the steel fiber content in coal gangue concrete by …
The coal gangue aggregate with n = 0.62 shows the highest density, water absorption, cylinder strength and the lowest voids. The results indicate that using coal …
In general, as coal gangue is actually a transition substance between rock and coal, its chemical composition is similar to that of natural coarse aggregate, which also confirms the feasibility of being a coarse aggregate in concrete production.
The results indicate that using coal gangue as coarse and fine aggregate in concrete is technically feasible and useful. When n is 0.62, the values of the slump, 28-day compressive, splitting tensile strength, flexural strength and elasticity modulus of coal gangue concrete reach the highest.
The Xiaoyu coal gangue (XCG) was collected from Shuozhou, Shanxi province, China, the coal sample was crushed and sieved to 200 mesh and dried at 110 °C for 24 h, whose main mineral composition was shown in S 1 (Supplementary material S 1).