— To enable effective raw coal gangue use, the effects of various alkali activators on coal gangue-slag-fly ash geopolymer grouting material (CSFGM) were investigated. Results showed that for sodium silicate modulus at 1.4, sodium silicate content at 12% and Na 2 O content at 6%, CSFGM showed the highest compressive. The …
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— This paper investigates the feasibility of using coal gangue as coarse and fine aggregates in concrete as well as how the coal gangue aggregate grading affects …
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— A novel high-strength phosphoric acid-activated calcined coal gangue based geopolymer (PCBG) was developed. • The strength development mechanism, optimal mix, durability, and engineering performances were analyzed. • The nano-scale hydration structure modes of PCBG were firstly developed. •
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However, bricks produced using only coal gangue often have disadvantages, including low compressive strength and poor thermal insulation. Process optimization is necessary to produce coal-gangue-based bricks with high strength and good thermal insulation. Mixing coal gangue with other raw materials according to a certain proportion is feasible.
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— Coal gangue, as a subgrade filler, is of great significance for the sustainable development of the economy, society, and environment. Particle crushing tests were conducted on coal gangue coarse-grained subgrade filler (CGSF) under uniaxial compression conditions, and the relationships between load and displacement, crushing …
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— Coal gangue is a byproduct of coal mining and processing, and according to incomplete statistics, China has amassed a substantial coal gangue stockpile exceeding 2600 large mountains, which poses a …
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— Geopolymer is a green non-metallic material with high strength and favorable properties in resistance to corrosion, fire, and high temperature, which makes it a potential substitute for Portland cement. The existing studies have primarily focused on the preparation of geopolymers using silico-alumina materials such as fly ash, red mud, …
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— However, coal gangue is significantly different with rock aggregate in strength and stiffness, i.e., the elastic modulus and strength of coal gangue are normally much lower than those of coal gangue. Yang et al. [ 18 ] investigated the mixture of backfill materials and determined an optimization ratio of cement, lime, desulfurized gypsum and ...
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— An aluminum silicate fiber/alumina aerogel (ASF/AA) composite was prepared via the sol-gel method and atmospheric drying (APD) method using coal gangue (CG) solid waste from Xingxian county, Shanxi Province, as the aluminum source. Utilizing N2 adsorption, scanning electron microscopy, Fourier transform infrared spectroscopy, …
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— Spontaneous combustion coal gangue (SCCG) is considered to be an aluminosilicate-based solid waste containing various toxic ions. The alkali-activation method for this material can not only fully use its potential hydration activity but also solidify the hazardous components to some extent. Through introducing additional Pb2+, the …
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The cemented coal gangue backfill (CGB) in coal mining is normally made of gangue (particle size of 0–15 mm), fly ash, cement, and water. In this study, the effects of the …
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— Coal gangue is a kind of solid waste produced in the coal mining and preparation. ... The results showed that the flexural and compressive strengths of concrete prepared with cement replaced by 15 wt% thermally activated coal gangue powder at 800 °C were 0.39% and 5.94% lower than those of pure cement concrete and 7.47% and …
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— Consequently, coal gangue aggregates exhibit low strength, high crushing indices, and high water absorption rates [31]. At 1d curing, both the normal and microwave groups exhibit partial aggregate exposure and crushing of aggregates. However, compared to the normal group, the microwave group exhibited fewer cracks in the cement paste of …
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— Fig. 1 shows that the compressive strength of the ceramsite varied from 23.07 to 24.08 MPa when the coal gangue content was 30–40mass%. When the coal gangue concentration was 40mass%, the compressive strength was the highest (24.08 MPa), even though the 1-h water absorption was only 1.66%.
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— To investigate the size effect of self-ignition coal gangue coarse aggregate concrete, this experiment employed three different sizes of cubic specimens. The compressive strength of concrete cubes is summarized in Table 2, and the experimental setup is shown in Fig. 11. The average compressive strength is chosen as the analytical …
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— This paper investigates the feasibility of using coal gangue as coarse and fine aggregates in concrete as well as how the coal gangue aggregate grading affects concrete properties. Nine mixed concrete samples were prepared with the value n in Fuller's curve ranged from 0.44 to 0.68. The coal gangue aggregate with n = 0.62 shows the …
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— Coal gangue is one of the largest industrial solid wastes discharged by coal mining countries such as China, the United States, Australia, and South Africa, etc. ... Taking 28d as an example, when the content of CGCA is 30%, 50%, 70% and , the compressive strength of calcined coal gangue concrete increases by 7.61%, 8.02%, …
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— The utilization of calcined coal gangue (CCG) and limestone for the preparation of blended cement is an efficient approach to address the issue of coal gangue disposal. However, the compressive strength development of blended cement is slow, particularly at high substitution levels of CCG. Therefore, this study aimed to promote …
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— The results indicate that coal gangue is not an ideal aggregate for pipeline gravity flow backfill, but such disadvantages of gangue as bad fluidity and serious pipe wear can be overcome by addition of fly ash. ... It is approved that quality indexes such as strength and dewatering ratio and piping feature of slurry can satisfy requirement of ...
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— The full-range prediction analysis for the strength degradation of coal gangue concrete-filled steel tube implies that relative higher steel strength and lower concrete strength should be used in ...
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— This work shows that the grain size of coal gangue has affects on the strength of concrete with coal gangue. Coal gangue was crushed and separated into three grades sand according to the size which were 0.16-0.6mm, 0.6-2.5mm and 2.5-5mm. Then these coal gangue sand was used to manufacture concrete with a density of about …
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— Keywords: coal gangue; compressive strength; hydration reaction; microscopic analysis; thermal activation. DOI: 10.14359/51738821. Date: 7/1/2023. Abstract: Coal gangue is one of the largest industrial solid wastes, and the application of coal gangue to cement-based materials is an effective way of resourcing the use of coal gangue.
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— Microstructure Analysis and Effects of Single and Mixed Activators on Setting Time and Strength of Coal Gangue-Based Geopolymers Gels. 2022 Mar 21;8(3):195. doi: 10.3390/gels8030195. ... The coal gangue geopolymers were mainly C-A-S-H, N-A-S-H, and C-N-A-S-H gels. The mixed activator tended to yield higher strengths …
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Download Citation | On Jul 1, 2023, Jie Yan and others published Influence of Activated Coal Gangue Powder on Compressive Strength of Coal Gangue Coarse Aggregate Concrete | Find, read and cite ...
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— Finally, the strength formation mechanism of coal gangue emulsified asphalt mixture is analyzed from the microscopic point of view. The results determined 7.5% as the optimum amount of emulsified asphalt in coal gangue emulsified asphalt mixture and recommended the best parameter combination of 7.5% emulsified asphalt, 6% coal …
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— Su et al. [19] studied the influence of thermal activated coal gangue powder on the compressive strength of concrete, and found that at 800 °C, the compressive strength of concrete prepared using 15 wt% thermal activated coal gangue powder is 5.94% lower than that of pure cement concrete, and 20.17% higher than that of ordinary coal …
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— In order to investigate the strengthening influence of silica fume on the sulfate corrosion resistance of reclaimed coal gangue sand concrete (RCGSC), the compressive strength, failure morphology, micromorphology, phase composition, compressive strength efficiency and corrosion resistance coefficient were analyzed, …
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Coal gangue: The coal gangue (CG) used in this study is untreated raw coal gangue, sourced from Lingshou County, Hebei Province, China. Its appearance mostly presents as flakes or blocks of black-gray rocks, and the shape and size of CG vary. ... The strength of coal gangue-based cementitious materials under different microwave activation ...
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— Coal gangue (CG), a byproduct of coal washing and mining, has experienced a substantial increase in production in tandem with rising energy consumption trends. ... (LC 3), a ternary system combined with limestone and calcined clays to substitute clinker, exhibits similar strength to OPC and better performance against deterioration in concrete ...
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— The calcined coal gangue can effectively improve the compressive strength. After adding coal gangue (500–900 °C), the 3 and 7 d compressive strength significantly …
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