Rheological Study on Cemented Coal Gangue Fly-Ash Backfill Slurry Associated with Fly Ash Impacts

Abstract:

The cemented coal gangue-fly ash backfill (CGFB) slurry has commonly been used to control subsidence damage caused by underground coal mining. This paper discusses the CGFB slurry rheological characteristic associated with the various percentage of the fly ash within the configuration of the mixture. A general description about CGFB slurry fluidity in the pipe transportation is provided. The physical, chemical and rheological characteristic of the CGFB have been determined in the test. The fly ash was mixed with 18%, 20% and 22% of solid concentration with respects to 12%, 10% and 8% for cement on various concentrated CGFB slurry ranges 76.05%, 78.05% and 80.05%. The tests verify the CGFB slurry exhibits non-Newtonian behavior in nature as Bingham plastic fluid. The experimental data show CGFB slurry rheological characteristic is noticeable influenced by the slurry solid concentration and the proportion of the fly ash, which affects the value of yield stress and viscosity. The lower value of the rheological parameters was observed on 22 % fly ash other than the 18 % case based on the same solid concentration of CGFB slurry.

• Periodical: Key Engineering Materials (Volume 831)
• Pages: 100-104
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.831.100
• Online since: February 2020
• Authors: Jie Yang*
• Keywords: Cemented Coal Gangue Fly-Ash Backfill Slurry, Fly Ash, Rheological Characteristic, Viscosity, Yield Stress

References

[1] X. X. Miao, M. G. Qian, Research on green mining of coal re-sources in China: current status and future prospects, J. Mining Safety Eng. 26 (2009) 1-14.

[2] J. Yang J, A. T. Iaanchnoich, B. G. Yang, Cemented coal gangue fly ash backfill technique, 37th Int. Conf. Ground Control in Mining, (2018) 204-209.

[3] D. Wu, B. G. Yang, Y. C. Liu, Transportability and pressure drop of fresh cemented coal gangue-fly ash backfill slurry in pipe loop, Powder Technol. 284 (2015) 218-224.

DOI: 10.1016/j.powtec.2015.06.072

[4] W. B. Xu, B. G. Yang, S. L. Yang, Experimental study on correlativity between rheological parameters and grain grading of coal gauge backfill slurry, J. Central South University (Sci. Technol.) 47 (2016) 1282-1289.

[5] N. Latifi, A. Matro, A. S. A. Rashid, Strength and physico-chemical characteristics of fly ash-bottom ash mixture, Arabian J. Sci. Eng. 40(9) (2015) 2447-2455.

DOI: 10.1007/s13369-015-1647-4

[6] M. Convery, C. Y. Yin, B. M. Goh, A. S. A. K. Sharifah, Characterization of glass-ceramics produced from vitrification of glass f Malaysian coal fly ash, Int. J. Mech. Mater. Eng. 5(1) (2010) 1-4.

[7] C. Y. Lee, H. K. Lee, K. M. Lee, Strength and microstructural characteristics of chemically activated fly ash–cement systems, Cem. Concr. Res. 33(3) (2003) 425-431.

DOI: 10.1016/s0008-8846(02)00973-0

[8] A. Rawat, S. N. Singh, V. Seshadri, Computational methodology for determination of head loss in both laminar and turbulent regimes for the flow of high concentration coal ash slurries through pipeline, Particulate Sci. Technol. 34(3) (2016) 289-300.

DOI: 10.1080/02726351.2015.1075637

[9] B. G. Yang, J. T. Wang, Y. L. Li, Backfill Coal Mining Technology with High Concentrated Cementing Material in Underground Mine, Coal Sci. Technol. 41 (2013) 22-26.

[10] B. G. Yang, Y. T. Liang, Y. K. Wang, Admixture Ratio of High Concentration Cementation Backfilling Materials in Coal Mine, EJGE, 20 (2015) 10091-10101.

[11] D. P. Bentz, C. F. Ferraris, M. A. Galler, A. S. Hansen, J. M. Guynn, Influence of particles size distributions on yield stress and viscosity of cement fly ash pastes, Cem. Concr. Res. 42(2) (2012) 404-409.

DOI: 10.1016/j.cemconres.2011.11.006