Experiments and Optimization of Mix Proportions for Cement Paste Backfill Materials with Extra-Fine Unclassified Tailings

Abstract:

To produce effective cement paste backfill materials at iron mines technologically and economically, orthogonal experiments of mix proportions with extra-fine unclassified tailings were carried out. The results of the range analysis showed that the sensitivity of influential factors to the slurry slump is sequentially mass concentration, tailing/rock ratio, and cement/(tailing+rock) ratio. The sensitivity to bleeding rate, concretion time and 28-day uniaxial compressive strength is sequentially mass concentration, cement/(tailing+rock) ratio and tailing/rock ratio. Relationships of paste properties and influential factors can be demonstrated with regression analysis. Additionally, the optimal mix proportion for cement paste backfill was obtained with 78% mass concentration, 7:3 tailing/rock ratio and 1:25 cement/(tailing+rock) ratio. The slump, bleeding rate, concretion time and R28 of the optimal mixture are 25.2 cm, 8.77%, 20.9 h and 1.29 MPa, respectively. The experimental results show a feasible way to produce the industry standard backfilling materials.

• Periodical: Key Engineering Materials (Volume 744)
• Pages: 146-151
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.744.146
• Online since: July 2017
• Authors: Mingqing Huang, Xiao Hui Liu*, Hai Yong Cheng
• Keywords: Cemented Paste Backfill, Experimental Optimization, Extra-Fine Tailings, Mix Proportion, Orthogonal Approach

References

[1] W. X. Li, C. Y. Gao, X. Yin, et al, A visco-elastic theoretical model for analysis of dynamic ground subsidence due to deep underground mining, Appl. Math. Model. 39 (2015) 5495-5506.

DOI: 10.1016/j.apm.2015.01.003

[2] T. Belem, M. Benzaazoua, Design and application of underground mine paste backfill technology, Geotech. Geolog. Eng. 26 (2008) 147-174.

DOI: 10.1007/s10706-007-9154-3

[3] Z. Aldhafeeri, M. Fall, Time and damage induced changes in the chemical reactivity of cemented paste backfill, J. Envir. Chem. Eng. 4 (2016) 4038-4049.

DOI: 10.1016/j.jece.2016.09.006

[4] Ministry of Construction of the People's Republic of China, Sandard for test method of performance on ordinary fresh concrete (GB50080-2002), China Building Industry Press Beijing, (2003).

[5] Ministry of Construction of the People's Republic of China, Sandard for test method of mechanical properties on ordinary concrete (GB50081-2002), China Building Industry Press Beijing, (2003).