Preparation and Performance Research of Coal Gangue-Slag Geopolymer Mortar

Mingjie Qin

doi:10.6919/ICJE.202412_10(12).0006

Authors

Mingjie Qin

DOI:

https://doi.org/10.6919/ICJE.202412_10(12).0006

Keywords:

Coal Gangue; Geopolymer; Sulfate Resistance; Pore Structure.

Abstract

To achieve effective utilization of coal gangue, the effects of different slag contents on coal gangue-slag geopolymer mortar material (CSGM) were investigated. Results showed that for slag content at 40%, alkali equivalent at 7%, alkali solution modulus at 1.2 and water-cement ratio at 0.42, CSGM showed the highest compressive strength, which was 47.1 MPa. The increase in slag content caused an improvement in the compressive strength of CSGM, but a decrease in flexural strength. As the mineral powder content increases, the initial and final setting times of the sample are significantly shortened. The prepared CSGM has good resistance to sulfate attack. The higher slag content increased the formation of N-A-S-H and C-A-S-H gels, leading to a further refined microstructure and pore structure.

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References

[1] Y. Fang, L. Yang, F. Rao, et al. Research progress on resource utilization of coal gangue by geological polymerization reaction, Min. Res. Dev. 43 (2023) 1–8.

[2] J. Chang, G. Du, J. Du, et al. Current situation of the comprehensive utilization of coal gangue in china and the related problems and recommendations, China Environ. Prot. Ind. (2022) 13–17.

[3] J. Li, J. Wang, Comprehensive utilization and environmental risks of coal gangue: a review, J. Clean. Prod. 239 (2019) 117946.

[4] C. Zhou, G. Liu, D. Wu, et al. Mobility behavior and environmental implications of trace elements associated with coal gangue: a case study at the Huainan Coalfield in China, Chemosphere 95 (2014) 193–199.

[5] Y.G. Liu, L.N. Yu, A.G. Zhou, Analysis of Coal Gangue Pollution Control Technology, 2nd International Conference on Advanced Materials and Engineering Materials (ICAMEM 2012), Trans Tech Publications Ltd, Beijing, PEOPLES R CHINA, 2012, pp. 941–944.

[6] L. Yang, J.F. Song, X. Bai, et al. Leaching behavior and potential environmental effects of trace elements in coal gangue of an open-cast coal mine area, Inner Mongolia, China, Minerals 6 (2) (2016) 18.

[7] D. Zurinskas, D. Vaiciukyniene, G. Stelmokaitis, et al. Clayey soil strength improvement by using alkali activated slag reinforcing, Minerals 10 (12) (2020) 12.

[8] F. Gu, J. Xie, C. Vuye, et al. Synthesis of geopolymer using alkaline activation of building-related construction and demolition wastes, J. Clean. Prod. 420 (2023) 138335.

[9] L.J. Kong, W.J. Zhao, D.X. Xuan, et al. Application potential of alkali-activated concrete for antimicrobial induced corrosion: a review, Construct. Build. Mater. 317 (2022) 13.

[10] T.A. Aiken, L. Gu, J. Kwasny, et al. Acid resistance of alkali-activated binders: a review of performance, mechanisms of deterioration and testing procedures, Construct. Build. Mater. 342 (2022) 22.

[11] B. Ren, J. Wang, Z. Zhou, et al. Regulation of the composition of metakaolin-based geopolymer: effect of zeolite crystal seeds, Case Stud. Constr. Mater. 19 (2023) e02421.

[12] H. Wu, C. Liang, D. Yang, et al. Development of sustainable geopolymer materials made with ground geopolymer waste powder as renewable binder up to 100, Constr. Build. Mater. 400 (2023) 132746.

[13] A. Zhou, K. Li, T. Liu, et al. Recycling and optimum utilization of engineering sediment waste into low-carbon geopolymer paste for sustainable infrastructure, J. Clean. Prod. 383 (2023) 135549.

[14] D. Yang, M.Y. Lu,D. Song, et al. Research Progress of Geopolymer Cement [J]. Materials Reports, 2021, 35(S1): 644-649.

[15] I. Ismail, S.A. Bernal, J.L. Provis, et al. Modification of phase evolution in alkali-activated blast furnace slag by the incorporation of fly ash[J]. Cement and Concrete Composites. 2014, 45: 125-135.

[16] Y. Li , Y. Yao , X. Liu , et al. Improvement on pozzolanic reactivity of coal gangue by integrated thermal and chemical activation [J]. Fuel, 2013, 109 527-533.

[17] L. Chao, H. Sun, L. Li, A review: The comparison between alkali-activated slag (Si+Ca) and metakaolin (Si+Al) cements, Cem. Concr. Res. 40 (9) (2010) 1341–1349.

[18] G. Huang, Y. Ji, J. Li, et al. Improving strength of calcinated coal gangue geopolymer mortars via increasing calcium content [J]. Construction and Building Materials, 2018, 166 760-768.

[19] H.Q. Ma, H.Y. Chen, H.G. Zhu, et al. Study on the drying shrinkage of alkali-activated coal gangue-slag mortar and its mechanisms, Construct. Build. Mater. 225 (2019) 204–213.

[20] Q.C. Song, Study on Preparation and Properties of Coal Gangue-based Geopolymer and Its Porousmaterials [D], Hengyang: University of South China, 2019:19-28.

[21] García‐Lodeiro I, Fernández‐Jiménez A, Palomo A, et al. Effect of calcium additions on N–A–S–H cementitious gels[J]. Journal of the American Ceramic Society, 2010, 93(7): 1934-1940.

[22] Kramar S ,Šajna A ,Ducman V . Assessment of alkali activated mortars based on different precursors with regard to their suitability for concrete repair [J]. Construction and Building Materials, 2016, 124 937-944.

[23] Puligilla S ,Mondal P . Role of slag in microstructural development and hardening of fly ash-slag geopolymer [J]. Cement and Concrete Research, 2013, 43 70-80.

[24] J. Xie, J. Wang, R. Rao, et al. Effects of combined usage of GGBS and fly ash on workability and mechanical properties of alkali activated geopolymer concrete with recycled aggregate [J]. Composites Part B, 2019, 164 179-190.

[25] H.Q. Ma, Study on Performance of Alkali-activated Coal Gangue-slag Cementitious Materials and Durability of Concrete [D]. China University of Mining and Technology (beijing), 2021.

[26] F.D. Nurhayat, Utilization of Natural and Waste Pozzolans as an Alternative Resource of Geopolymer Mortar [J]. International Journal of Civil Engineering, 2018, 16 (2): 179-188.