Authors: Huang, M; Gao, Q
Editors: Wu, A; Jewell, R
Conference: 20th International Seminar on Paste and Thickened Tailings, 16-18 June, Beijing
Published: University of Science and Technology Beijing, Proceedings of the 20th International Seminar on Paste and Thickened Tailings, pp.155-160, Beijing
Open stope mining with sequent backfilling was the major method adopted at Qijiaojing Iron Mine, and mix proportions of backfill materials were performed to produce the industrially required cemented paste backfill (CPB). The materials mainly comprise unclassified extra-fine tailings, waste rocks and Portland cements, and the experiments of the mix proportions followed the L16 (45) orthogonal design. The results showed that contents of -20 and -37 μm extra-fine grains within tailings accounted for 54 and 69wt%, respectively. The range analysis of orthogonal experiments shows that mass concentration, tailing-waste ratio and waste-cement ratio are the most to least sensitive factors to the slurry slump, 3-day and 7-day strengths. For 28-day strength, the sensitive variables are sequentially mass concentration, waste-cement ratio and tailing-waste ratio. Additionally, the optimal mix proportion for cement paste backfill is obtained with a mass concentration of 78wt%, a tailing-waste ratio of 0.7 and a waste-cement ratio of 25. The slump and 28-day strength of the optimal CPB are 25.2 cm and 1.29 MPa, respectively.
Huang, M & Gao, Q 2017, 'Strength and fluidity of cemented paste backfill at Qijiaojing Iron Mine, Northwest China', in A Wu & R Jewell (eds), Proceedings of the 20th International Seminar on Paste and Thickened Tailings
, University of Science and Technology Beijing, Beijing, pp. 155-160.
Aldhafeeri, Z., and Fall M. 2016, ‘Time and damage induced changes in the chemical reactivity of cemented paste backfill’, Journal of Environmental Chemical Engineering, vol. 4, pp. 4038‐4049.
Koohestani, B., Koubaa, A., Belem, T., Bruno Bussièrea, B., and Bouzahzaha H. 2016, ‘Experimental investigation of mechanical and microstructural properties of cemented paste backfill containing maple-wood filler’, Construction and Building Materials, vol. 121, pp. 222‐228.
Ministry of Construction of the People's Republic of China 2003, ‘Standard for test method of performance on ordinary fresh concrete (GB50080-2002) ’, China Building Industry Press Beijing, Beijing, pp. 1-40.
Ministry of Construction of the People's Republic of China, ‘Standard for test method of mechanical properties on ordinary concrete (GB50081-2002) ’, China Building Industry Press Beijing, Beijing, pp. 1-66.
Suttaphakdee, P., Dulsang, N., Lorwanishpaisarn, N., Kasemsiri, P., and Chindaprasirt, P. 2016, ‘Optimizing mix proportion and properties of lightweight concrete incorporated phase change material paraffin/recycled concrete block composite’, Construction and Building Materials, vol. 127, pp. 475‐483.