Effects of Micro Fines Content on Performances of Mortar Prepared with Mill Tailings from Magnetite

Abstract:

In production of manufactured fine aggregate (MFA) from magnetite mill tailings (MT), the micro fines (particles smaller than 75 microns) was strictly eliminated. This results in lower utilization of the resources and worse micro grading of MFA. The mortar samples were prepared with MT at various micro fines contents to investigate the effects on their fluidities and strengths. In optimal water-to-powder ratio (w/p, all powders included), the fluidities of mortars reached maximum and the strengths of mortars could be improved at suitable content of micro fines in MFA. The application proves that MT can be used as MFA to prepare construction mortars up to standard and micro fines can be substituted for mineral admixture to prepare composite mortars for improving workability. So more MT can be utilized and micro fines in the tailings can take effect.

• Periodical: Advanced Materials Research (Volumes 287-290)
• Pages: 729-732
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.287-290.729
• Online since: July 2011
• Authors: Ji Wei Cai, Zheng Hang Lü, Guang Liang Gao, Ji Xu Wu
• Keywords: Magnetite Mill Tailings, Micro Fines, Mineral Admixture, Mortar, Stone Powder

References

[1] Jiwei Cai: Research of Effects and Mechanism of Micro Fines on Manufactured Fine Aggregate Concretes (in Chinese), PhD Dissertation of Wuhan University of Technology (2006)

[2] Jinrui Zhang, Weizhi Wang, Fuping Li, et al: Resource Comprehensive Utilization of Metallurgical Mill Tailings (in Chinese), Metallurgical Industry Press, Beijing (2002)

[3] Jiwei Cai, Shaobo Zhang, Guixiang Hou, et al: J. of Wuhan University of Technology Vol. 7 (2009), p.104

[4] Jiwei Cai, Xiaoxin Feng, Li Zhao, et al: J. of Wuhan University of Technology Vol. 7 (2009), p.88