Experimental Study on the Mechanical Properties and Microstructural Mechanisms of Coal Gangue-Based Cementitious Materials Synergistically Activated by Desulfurization Gypsum and Lime

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 932 - 932

Published: March 29, 2025

Coal gangue and flue gas desulfurization gypsum (DG) are industrial by-products whose utilization is critical for sustainable development. This study explores the synergistic activation of coal using DG lime to develop eco-friendly cementitious materials. Three systems-CF (coal gangue-DG), CL gangue-lime), CFL gangue-DG-lime)-were designed investigate effects on reactivity. Unconfined compressive strength tests identified optimal dosages lime, while XRD, SEM, TGA-DTG, NMR analyses were employed characterize hydration products microstructure. The results demonstrated that calcium ions from both facilitated formation C-(A)-S-H gel, enhancing However, excessive led undesirable volume expansion due ettringite overproduction, compromising material stability. Excess forms weak Ca(OH)2 binding phases causes cracking heat, reducing durability. Thus, dosage in CF system 70%, 6%. In system, 70% 4% achieve best performance. combined use not only improved reactivity but also achieved an balance between enhancement long-term stability, offering a promising approach construction

Language: Английский

---

A Review of Mechanical Properties of Fiber Gangue Aggregate Concrete

Hans Journal of Civil Engineering, Journal Year: 2025, Volume and Issue: 14(04), P. 815 - 821

Published: Jan. 1, 2025

Language: Английский

---

Coal and Coal By-Products as Unconventional Lithium Sources: A Review of Occurrence Modes and Hydrometallurgical Strategies for Metal Recovery

Minerals, Journal Year: 2024, Volume and Issue: 14(8), P. 849 - 849

Published: Aug. 22, 2024

Lithium, a critical material for the global development of green energy sources, is anomalously enriched in some coal deposits and by-products to levels that may be considered economically viable. Recovering lithium from coal, particularly gangue or ashes, offers promising alternative extracting this element. This process could potentially lead economic gains positive environmental impacts by more efficiently utilizing coal-based waste materials. review focuses on concentrations by-products, modes occurrence, methods used identify lithium-enriched phases, currently available hydrometallurgical recovery methods, correlated with pretreatment procedures enable release inert aluminosilicate minerals. Leaching raw appears inefficient, whereas fly ash are feasible due their simpler composition higher contents. Lithium extraction can achieve rates over 90%, but low high impurity leachates require advanced selective separation techniques. Bottom has not yet been evaluated recovery, despite its content compared feed coal.

Language: Английский

---

Novel low-carbon eco-concrete filled-FRP tubes under axial compression: Experimental behavior and analytical model

Engineering Structures, Journal Year: 2024, Volume and Issue: 319, P. 118773 - 118773

Published: Aug. 20, 2024

Language: Английский

---

Preparation and properties of phosphogypsum-based calcined coal gangue composite cementitious materials

Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 21, P. e03963 - e03963

Published: Nov. 7, 2024

Language: Английский

---