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The system strength is increased in a linear mode with the increase of metakaolin The finely grounded coal gangue is used as the inert filler that coordinates with Na2SiO3 to improve fluidity The main hydration products of this filling material are N―A―S―H and zeolites Right after Si―O―Si depolymerization the tetrahedral Al―O
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The R2 value of the fitting function of strength and weight loss micropores content as well as the total porosity exceeded which improved the characterization of the enhancement
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The five different illuminance involved in this experiment were 3790 11 310 17 130 23 500 and 31 070 Lux respectively A total of 1800 coal and gangue images after graying were obtained in the
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Preparation of coal gangue ceramsite high strength concrete and investigation of its physico mechanical properties Table of Contents Fresh concrete properties the traditional concrete mix design method considers that the strength increases as the sand ratio decreases which obviously does not satisfy the requirements of the CGCLAC
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Compressive and Splitting Tensile Strength of Coal Gangue Ceramsite Lightweight Aggregate Concrete in Different Ages The raw materials described in Materials were used as raw materials for this test Table 1 shows the mix ratio of CGCLWAC Because of the time deviation three batches of CGCLWAC test were manufactured and cured to five
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The basic physical properties of natural gravel and coal gangue were tested as listed in Table 1 It can be seen that compared with natural gravel coal gangue shows smaller apparent density but much larger water absorption and crushing index which implies the porous microstructure of coal gangue
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The disorderly accumulation of coal gangue not only occupies a large amount of land resources and causes natural disasters but also pollutes the surrounding ecological environment which in turn affects human health and normal production and life
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The coal gangue aggregate with n = shows the highest density water absorption cylinder strength and the lowest voids The results indicate that using coal gangue as coarse and fine aggregate in concrete is technically feasible and useful
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Affiliations 1 School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou 450045 China 2 State Key Laboratory of Eco Hydraulics in Northwest Arid Region Xi an University of Technology Xi an 710048 China PMID 35806620 PMCID PMC9267344 DOI /ma15134495
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China s total coal production in 2024 exceeded billion tons 52% of the world s total Coal gangue a solid waste of coal mining accounts for 15 20% of coal production when directly discharged on the ground surface as waste heaps it occupies large areas of land and cause environmental pollution This paper summarizes the existing gangue backfilling methods their
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1 Technical principle of coal mining with gangue cemented filling 2 。 《》 ；XRF 。 1 2。 1 Table 1 Physical properties of alkali slag 2 Table 2 Main chemical composition of alkali slag
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The thickness of the gangue between F 15 and F 16 is m and it gradually becomes thinner from outside to inside The direct bottom is sandy mudstone with a thickness of m It is below coal seam F 17 The old bottom is sandy mudstone with a thin layer of fine sandstone and limestone and the thickness is >10 m Mechanical model
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w/ CGCOC10%。 CGC 。 、 CGCOC。 CGC（ITZ）（w/c） OC。 w/ CGCOC10%。 CGC 。 w/ CGCOC10%。 CGC 。 w/ CGCOC10%。 CGC 。
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Sell Coal gangue crusher crusher is economical and practical and efficient to operate and maintain certification structure small size light weight large capacity Therefore they have low production costs 2 Ore is broken
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The LOI of the coal gangue reaches as high as wt% which is attributed to the high content of organic matter as well as clay minerals calcite and dolomite in the coal gangue Besides the coal gangue has a calorific value Q gr v d of MJ kg −1 determined according to Chinese National Standard GB/T 213 2024
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Coal gangue is the industrial solid waste with the largest discharge volume resulting in such problems as land occupation environmental pollution ecological destruction and high treatment costs [1 4] Therefore it is of great economic social and environmental significance to make use of the waste coal gangue to produce concrete
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Using coal gangue CG as a building material does not only reduce the disposal of industrial waste and promote the resource utilization of solid waste but also solves the excessive consumption of sand and stone in construction This study experimentally investigated calcining ceramisites from CG r …
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CG samples showed peak strength when compared with CGS FA and GGBS added samples before 14 days curing time It indicated that CG has higher activity at the early age compared with CGS FA and GGBS The highest strength about 63 MPa was shown by CG sample when curing age up to 56 days
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A new method of lithologic identification and distribution characteristics of fine grained sediments A case study in southwest of Ordos Basin China Qiqi Lyu Shunshe Luo Yulong Guan Jinhua Fu Xiaobing Niu Liming Xu Shengbin Feng Shixiang Li Page range 17 28 Cite this Download PDF Open Access February 26 2024
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DOI / Corpus ID 219043581 Study on compressive strength and durability of alkali activated coal gangue slag concrete and its mechanism article{Ma2020StudyOC title={Study on compressive strength and durability of alkali activated coal gangue slag concrete and its mechanism} author={Hongqiang Ma and Hongguang Zhu and Chao Wu and Hongyu Chen and Jianwei Sun and
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The partial fi lling mining PFM method proposed in this paper can make full use of coal gangue and is of great signi fi cance to the prevention and control of water disasters at the working face The speci fi c process used to implement this method is to fi rst divide the working face into several narrow working faces and then fi ll the…
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Coal gangue is a type of solid waste that is generated in the process of coal mining and washing This concept can be effectively used in reinforced engineering fillings The influences of shear rates and geogrid transverse ribs were studied using a large indoor direct shear test The test results showed that the relationship between shear stress and shear displacement of geogrid coal gangue
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Under the conditions of calcined coal gangue content and water glass modulus which are fixed the effects of H 2 O 2 content curing temperature CMC content and liquid to solid ratio on 7 d and 28 d compressive strength of the foamed geopolymer were studied
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Gangue is one of the most important components of CGB for coal mining this is because crushed gangue exhibits a pozzolanic activity and a certain degree of strength [ 8 10 ] However considering the slurry transportation restriction and the compressive properties of the CGB the maximum particle size of coal gangue is normally 15 mm at maximum
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The flotation characteristic of the composite coal reveals that recoverable combustible at 15% ash is 27% and 43% at the 17% ash level The low yield of the concentrate is due to the presence of fines comprising high ash To enhance the yield the − mm and − mm fractions were subjected to flotation separately
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Effect of Coal Gangue Grain Size on Strength of Foam Concrete inproceedings{Ni2020EffectOC title={Effect of Coal Gangue Grain Size on Strength of Foam Concrete} author={Kun Ni and Yun Xing Shi and Zhihua Hu and Yangang Zhang and Pengcheng Wan} year={2024} } Kun Ni Y Shi 2 authors Pengcheng Wan Published 1 November 2024 Materials Science
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The present analysis is based on the mining conditions of the 8101 and 8102 working face in Tashan coal mine Datong City Shanxi Province Tashan coal mine is a typical hard roof coal present the main mining area is a Carboniferous 5 coal seam with a thickness of 14 20 m and a depth of 400 800 coal seam and roof
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Introduction Coal gangue CG is a type of industrial solid waste produced by the process of coal excavation and separation 1 one ton of CG is discarded for every 10 tons of produced coal 4 show that 5 6 billion tons of CG are now stored and the accumulation increases at the rate of 150 200 million tons per year in China 6 7
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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
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The evolution of coal gangue CG calcium hydroxide CH gypsum H 2 O system Author SHI TAO 1 XU Bi Wan 2 SHI Hui Sheng 2 [1] School of Material Science and Engineering Southeast University Nanjing 211189 China [2] Tongji University Shanghai China Source
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