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Cited by 91Concrete and Cement Materials ResearchZeolite Catalysis and SynthesisRecycling and utilization of industrial and municipal waste in materials production

Preparation and Reaction Mechanism Characterization of Alkali-activated Coal Gangue–Slag Materials

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Ma, Hongqiang, Zhu, Hongguang, Yi, Cheng, Fan, Jingchong, Chen, Hongyu, Xu, Xiaonan, Wang, Tao·2019·Materials
DOI 10.3390/ma12142250PMC PMC6679010
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Abstract

In this paper, slag is used as a calcium source to make alkali-activated coal gangue–slag (AACGS) based material. The reaction mechanism of AACGS materials was discussed in depth by means of XRD, FT-IR, 29Si MAS-NMR (nuclear magnetic resonance) and SEM-EDS (energy dispersive spectrometer). The experimental results show that coal gangue can be used as a raw material for preparing alkali-activated materials. The liquid–solid ratio is the most influential factor on AACGS paste fluidity and strength, followed by slag content. As the modulus of sodium hydroxide increases, the depolymerization process of the reactant precursor is accelerated, but the high sodium hydroxide concentration inhibits the occurrence of the early coal gangue–slag polycondensation reaction, and exerts little effect on the 28 d compressive strength. Ca2+ in the slag promotes exchange with Na+, and the product is converted from N-A-S-H gel to C-(A)-S-H gel, and C-(A)-S-H is formed with higher Ca/Si ratio with the increase of slag content. The slight replacement of coal gangue by slag can greatly improve the reaction process and the strength of AACGS materials.

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  • The alkali excitation reaction explains the formation of the precipitates: dissolution of SiO2 and Al2O3 in fly ash in a strong alkali environment; CaO reacting with silicate and aluminate monomers to form reaction products and C-A-S-H and C-S-H; Na+ balancing charge and being absorbed by the silica-alumina phase to form N-A-S-H; and some Ca2+ displacing Na+ to form C-A-S-H.

    “The alkali excitation reaction can explain the formation of the above precipitates: (i) The dissolution of SiO 2 and Al 2 O 3 in fly ash in a strong alkali environment; (ii) A small amount of CaO in fly ash reacts with silicate and aluminate monomers to form reaction products; (iii) Some CaO reacts with silicate and aluminate monomers to form C-A-S-H, and some CaO reacts with silicate monomers to”

    From Expansive Soil Stabilization Using Alkali-Activated Fly Ash (2023) · cites this paper as [41]

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Cited by

Sorted by citations

Authors
Ma, H., Zhu, H., Yi, C., Fan, J., Chen, H., Xu, X., & Wang, T.
Affiliations
  • China University of Mining and Technology - Beijing (CN)
  • School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Corresponding author
Zhu, Hongguang
ORCID
Venue
Materials
Publisher
MDPI AG
Published
2019-07-12
Volume
12
Issue
14
Pages
2250
ISSN
1996-1944 (ISSN-L)
DOI
10.3390/ma12142250
PMC
PMC6679010
OpenAlex
W2957776758
Cited by
91
References
1
Citations by year
2026: 17 · 2025: 19 · 2024: 11 · 2023: 16 · 2022: 13 · 2021: 6 · 2020: 8 · 2019: 1
FWCI
5.07
Type
journal article
Language
en
Open access
Licence
Locations
  • Materials (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (NO.51578539)
  • Natural Science Foundation of Beijing Municipality (NO.8164061)
Topics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
  • Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
  • Physical Sciences › Engineering › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
Keywords
alkali-activated materials, coal gangue, slag, calcium sources, reaction mechanism, liquid-to-solid ratio, polycondensation, N-A-S-H gel, C-A-S-H gel, compressive strength, Ca/Si ratio

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