Carbonation curing of magnesium-coal slag solid waste backfill material: Study on properties of flow, mechanics and carbon sequestration

Case Studies in Construction Materials, Год журнала: 2024, Номер 20, С. e03204 - e03204

Опубликована: Апрель 24, 2024

To expedite the achievement of ''30-60 double carbon'' goal, it is imperative to create a novel, low-carbon, cost-effective, and sustainable backfill material for mining purposes. Against this background, paper investigates workability, carbonation performance carbon sequestration capacity coal gangue (CG), magnesium slag (MS) fly ash (FA) as solid waste material. The results study show that: (1) rheological properties CFM fresh slurry conform Herschel-Balkley (H-B) model, its flowability meets requirements mine transport. With increasing MS content, yield stress, apparent viscosity, thixotropy shear thickening increase, micro-slump diffusion diameter decrease. (2) Carbonation curing can effectively improve early UCS CFM. highest was 8.854 MPa after 7 days curing, which 27.84 times higher than that standard curing. In addition, increased with increase age content. (3) produces large number products such calcium carbonate makes microstructure denser. (4) absorb up 14.55% CO2 carbonation. (5) volume stability significantly improved summary, not only new type low-cost, low-carbon material, but practical application in field backfilling also has great potential realisation resource utilisation sequestration.

Язык: Английский

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Micro Strain Localization and Failure Behavior of Coal Gangue Interbedded Sediment

Energy & Fuels, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Язык: Английский

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Improving mechanism for recycling efficiency of ceramic construction solid waste and properties of composite backfill based on aggregate particle size distribution

Construction and Building Materials, Год журнала: 2024, Номер 436, С. 136826 - 136826

Опубликована: Июнь 7, 2024

Язык: Английский

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The effect of acid mine drainage on the properties of an all-solid waste paste backfill body based on oil shale residue

Construction and Building Materials, Год журнала: 2024, Номер 425, С. 136017 - 136017

Опубликована: Апрель 1, 2024

Язык: Английский

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Research on the Testing Method for the Rheological Properties of Large-Particle Gangue Filling Slurry

Processes, Год журнала: 2025, Номер 13(3), С. 789 - 789

Опубликована: Март 8, 2025

Coal mine gangue cementation filling technology has increasingly become an effective and major means of dealing with “coal mining under buildings, railways, bodies water” other complex hard-to-mine coal seams; but also, important part a large number treatments stockpiled on the ground is to realize green mines. cement often contains particles particle sizes larger than 15 mm; however, viscometer rheometer currently used at home abroad are unable accurately measure rheological parameters slurry containing large-particle-sized gangue. In order large-sized combined site materials, torque values obtained mixing blades different speeds were generated by action between blade side edge drum wall, as well lower bottom. A new type was developed. The mainly included components such power system, sensing mechanical auxiliary units. Finally, using Fluent software ANSYS2023 numerically simulate fluidity same conditions, results after calculation test showed that error within reasonable range, indicating correctness principles effectiveness instrument. This research offers insights for measuring sizes.

Язык: Английский

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Mechanical behavior and meso-degradation mechanism of cemented paste backfill under the coupled effect of disturbance damage and dry-wet cycles

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 19, 2025

To study the coupled degradation effects of disturbance damage and dry-wet cycles on backfill, cemented paste backfill (CPB, a mixture coal gangue, fly ash, cement water) samples with were prepared by cyclic loading tests. Subsequently, uniaxial compression tests performed CPB subjected to both cycles. Combined discrete element method, this systematically explores mechanical behavior meso-degradation mechanisms under action damage. The research shows that: ①The will cause samples, as number disturbances increases, degree gradually two are exponentially related. ②There is threshold value (5 times) for samples. Below threshold, strength increases increasing Above however, occurs, elastic modulus degrades more significantly than peak strength. ③The impact diminishes ④Under effect cycles, bind force between particles in decreases, energy absorption storage capacity frictional consumption internal pores microcracks initiate develop, structure changes from dense loose porous. results can effectively promote development application mining technology mines.

Язык: Английский

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Research on the strength influence and crack evolution law of layered backfill based on macro and meso mechanical response

Construction and Building Materials, Год журнала: 2024, Номер 449, С. 138493 - 138493

Опубликована: Сен. 27, 2024

Язык: Английский

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The Influence and Mechanism of Curing Methods and Curing Age on the Mechanical Properties of Yellow River Sand Engineered Cementitious Composites

Materials, Год журнала: 2024, Номер 17(17), С. 4307 - 4307

Опубликована: Авг. 30, 2024

This study investigates the potential use of Yellow River sand (YRS) sourced from lower reaches in China as a sustainable and cost-effective substitute for quartz Engineered Cementitious Composites (ECC). With an annual accumulation approximately 400 million tons this region, YRS presents substantial resource. ECC specimens with 100% replacement were subjected to various curing methods: natural, steam, standard, sprinkler. Extensive mechanical testing including flexural, compressive, uniaxial tensile, four-point flexural tests was conducted. Additionally, Scanning Electron Microscope (SEM) Mercury Intrusion Porosimetry (MIP) analyses investigated microscopic mechanisms influencing macroscopic properties. Finally, properties YRS-ECC test block after 14 days standard traditional compared analyzed. The results indicate that substitution under natural show optimal ultimate tensile strain more than 4%, providing best resistance reduction load deflection due aging. Steam enhances compressive strength, achieving 5 kN maximum 4.42 mm at 90 days. SEM analysis revealed C-S-H gel density higher steam curing, enhancing fiber pull-out steam-cured specimens. MIP demonstrated had highest porosity (32.86%) average pore size (51.69 nm), whereas resulted smallest size, 44% pores 50 nm. Compared sand, it is found bending are 5.7% 9.4% those ECC, respectively, its strength also improved. These findings highlight alternative proving most effective superior performance, strain, crack resistance, durability.

Язык: Английский

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A Novel Method for Preparing Lightweight and High-Strength Ceramisite Coarse Aggregates from Solid Waste Materials

Materials, Год журнала: 2024, Номер 17(11), С. 2613 - 2613

Опубликована: Май 29, 2024

A novel method is introduced in this study for producing ceramisite coarse aggregates that are both lightweight and possess high strength. The process involves utilizing fly ash as the primary material, along with coal floating beads (CAFBs) have softening temperature a spherical hollow structure serving template forming pores. This examined impact of varying particle size quantity on composition characteristics aggregates. Results showed provided stability to cavity throughout sintering process. Furthermore, pore could be effectively tailored by manipulating manufacturing procedure. obtained feature compact outer shell cellular inner core uniformly distributed pores isolated from each other mostly form. They achieve low density ranging 723 855 kg/m3, cylinder compressive strength between 8.7 13.5 MPa, minimal water absorption rates 3.00 4.09%. performance metrics these significantly exceeded parameters specified GB/T 17431.1-2010 standards.

Язык: Английский

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Strength Development of Cemented Paste Backfill with CaCl2 and NaCl in Above-Zero Underground Environments

Geotechnical and Geological Engineering, Год журнала: 2024, Номер 42(7), С. 5927 - 5945

Опубликована: Июль 16, 2024

Язык: Английский

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