Construction and Building Materials, Journal Year: 2024, Volume and Issue: 458, P. 139569 - 139569
Published: Dec. 12, 2024
Language: Английский
Construction and Building Materials, Journal Year: 2024, Volume and Issue: 448, P. 138223 - 138223
Published: Sept. 6, 2024
Language: Английский
Citations
4
Case Studies in Construction Materials, Journal Year: 2025, Volume and Issue: unknown, P. e04241 - e04241
Published: Jan. 1, 2025
Language: Английский
Citations
0
Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)
Published: Jan. 24, 2025
The large stockpile and low utilization rate of red mud (RM) have caused an urgent need for quantities RM to be eliminated. In this study, multi-solid-waste synergistic RM-based composite cementitious materials (MS-RMCM) were prepared using as the primary material, combined with fly ash, silica fume, quicklime. Orthogonal tests conducted investigate effects components on mechanical properties. effect mechanisms discussed by SEM–EDS results. results revealed that: (1) Range analysis indicated that factors influencing 28 d compressive strength ranked follows: quicklime (C) > fume (B) ash (A). optimal combination was determined A2B3C4, achieving a maximum 25.13 MPa 53% RM. (2) Variance F (fly ash) = 3.961 < F0.01, F(silica fume) 17.778 F(quicklime) 61.921 indicating had no significant strength, while effect, highly effect. (3) Microscopic showed improvement contributed mainly attributed their good potential pozzolanic activity microaggregate filling Quicklime enhanced compactness generating more hydration products after activating (4) Life cycle assessment calculations carbon emissions MS-RMCM 273.01 kg/t, unit emission coefficient 10.86 kg/MPa, advantages in reducing CO2 construction industry.
Language: Английский
Citations
0
Case Studies in Construction Materials, Journal Year: 2025, Volume and Issue: unknown, P. e04375 - e04375
Published: Feb. 1, 2025
Language: Английский
Citations
0
Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)
Published: March 1, 2025
Red mud (RM), a solid waste byproduct of the alumina industry, has accumulated in significant global stockpiles. Currently, primary application RM involves magnetic separation to recover iron oxides, while residual is predominantly landfilled. Due its strong alkalinity, can serve as substitute for alkalis or sodium salts alkali activation concrete, thereby accelerating setting time and improving early-age strength. Building on this property, study designs develops an based rapid filling support material, primarily composed RM, which features high early This material intended high-water-content materials gob-side entry retaining coal mining. Experimental results demonstrate that when content reaches 70% cement 10%, Rapid-Setting Filling Support Material (RSM) achieves satisfactory compressive strength initial time, coupled with excellent economic performance. The strengths at 1 day, 3 days, 7 28 days are 6.12 MPa, 8.97 11.25 12.33 respectively, meeting all requirements specified 'Technical Requirements Roadside Bag Gob-side Entry Retaining High-Water Material' (GB/T 39336-2020). RSM also exhibits good durability, hydration products including C–S–H gel, ettringite, calcium carbonate, contribute development. Leaching tests reveal heavy metal ion concentrations leachate comply integrated emission standards Class III groundwater wastewater, confirming safe application. Considering annual increase approximately 13,000 km roadway length mining China, demand substantial. Consequently, findings hold environmental value, potential promote green practices circular economy.
Language: Английский
Citations
0
Materials, Journal Year: 2025, Volume and Issue: 18(6), P. 1218 - 1218
Published: March 10, 2025
A novel composite cementitious material was constructed by synergistically utilizing multiple industrial solid wastes, including electrolytic manganese residue (EMR), red mud (RM), and ground granulated blast furnace slag (GGBS), with calcium hydroxide [Ca(OH)2] as an alkaline activator. In addition, the mechanical properties of materials were systematically analyzed under different raw ratios, alkali activator dosages, water-binder ratios. To further investigate hydration products mechanisms material, characterization methods, for instance, XRD, FT-IR, SEM-EDS, TG-DTG, employed to characterize materials. ensure that does not cause additional environmental pressure, it toxic leaching. The relevant experimental results indicate optimal ratio EMR–RM–GGBS–Ca(OH)2 components is EMR content 20%, RM 15%, GGBS 52%, 13%, 0.5. Under ratio, at 28 days exhibited a compressive strength 27.9 MPa, well flexural 7.5 MPa. in as-synthesized system primarily encompassed ettringite (AFt) hydrated silicate (C-S-H), their tight bonding middle later curing stages main source engineering strength. heavy metal concentrations 28-day leaching solution fall within limits prescribed drinking water hygiene standard (GB5749-2022), indicating this exhibits satisfactory safety performance. sum up, elucidated process involved research provide useful references pollution-free treatment resource utilization wastes such future.
Language: Английский
Citations
0
Gels, Journal Year: 2025, Volume and Issue: 11(3), P. 193 - 193
Published: March 11, 2025
This study investigated the feasibility of using semi-dry desulfurization ash (DA) in combination with blast furnace slag (BFS) to prepare gelling materials, aiming improve resource utilization DA. The effects DA dosage and mechanical grinding on compressive strength hydration mechanism BFS-DA materials were investigated. results showed that optimum ratio was 60:40, strengths 14.21 MPa, 20.24 43.50 46.27 MPa at 3, 7, 28, 56 days, respectively. Mechanical greatly improved activity gel greatest increase 90 days for BFS mixed milled 30 min, increases 89.86%, 66.36%, 24.56%, 25.68%, respectively, 26.22 35.6 58.33 63.97 cumulative heat slurry about 120 J/g. main products formed ettringite, C-S-H gel, AFm, Friedel’s salt. Calcium sulfite participated hydration, a new product, Ca4Al2O6SO3·11H2O, formed. can be effectively used BFS-based its performance meets requirements GB/T 28294-2024 standard, which provides potential solution resources reduction impact environment.
Language: Английский
Citations
0
Ecology and Industry of Russia, Journal Year: 2025, Volume and Issue: 29(3), P. 28 - 33
Published: March 11, 2025
Comprehensive studies of physicochemical properties, including textural and morphological, iron-containing waste from the landfill Zavolzhsky Chemical Plant (Ivanovo region, Russia) were carried out. The data on changes in elemental phase composition red mud depending depth occurrence time storage at obtained. Methods primary treatment wastes to obtain intermediates for synthesis catalysts proposed. Morphology distribution elements surface after its thermal different temperatures, as well porosity their air oxygen environment studied. use a semi-product chemisorbents deep processing process gases is recommended.
Language: Английский
Citations
0
Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112376 - 112376
Published: March 1, 2025
Language: Английский
Citations
0
Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 137990 - 137990
Published: March 1, 2025
Language: Английский
Citations
0