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Compression Behavior of Mine Tailings Amended with Cementitious Binders

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Abstract

The objective of this study was to evaluate the effect of fly ash amendment on the compression behavior of mine tailings. Natural and synthetic (i.e., laboratory prepared) mine tailings were used to assess the effects of tailings composition and tailings solids content on compressibility. Three types of off-specification fly ashes and Type I–II Portland cement were used as cementitious binders. Tailings-fly ash mixtures were prepared at solids content of 60–75% (water content = 33–67%), water-to-binder ratios of 2.5 and 5, and were cured for 0.1 days (2 h), 7, and 28 days. Bi-linear compression curves on semi-log plots were observed in most of the binder-amended tailings specimens. The break in slope on the compression curve was identified as the breaking stress, whereupon cementitious bonds were broken. The breaking stress increased with an increase in fly ash content, which was attributed to a lower water-to-binder ratio and void volume-to-binder volume ratio that produced more effective particle bonding. Breaking stress also increased with an increase in CaO content and CaO-to-SiO2 ratio of fly ash, which resulted in more effective bonding between particles. The effect of curing time on the breaking stress of fly ash amended specimens was characterized by (1) an increase in breaking stress via increase in curing time and cementitious bond formation or (2) a constant breaking stress with curing time due to competing mechanisms during loading. Specimens cured under a vertical stress showed an increase in breakings stress with applied load water removal prior to cementitious bond formation that reduced the water-to-binder ratio and led to more effective cementation.

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Acknowledgements

Financial support for this study was provided in part by the Mountain Plains Consortium awarded to North Dakota State University. Support also was provided by the Colorado State University. The opinions, findings, and conclusions expressed herein are those of the authors and do not represent the views of the Mountain Plains Consortium, North Dakota State University, or Colorado State University.

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Correspondence to Christopher A. Bareither.

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Gorakhki, M.H., Bareither, C.A. Compression Behavior of Mine Tailings Amended with Cementitious Binders. Geotech Geol Eng 36, 27–47 (2018). https://doi.org/10.1007/s10706-017-0299-4

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  • DOI: https://doi.org/10.1007/s10706-017-0299-4

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