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Effect of High Mixing Intensity on Rheological Properties of Cemented Paste Backfill

1
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Institut für Keramik, Glas-und Baustofftechnik der TU Bergakademie Freiberg, 09599 Freiberg, Germany
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(4), 240; https://doi.org/10.3390/min9040240
Received: 13 March 2019 / Revised: 8 April 2019 / Accepted: 10 April 2019 / Published: 18 April 2019
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PDF [3185 KB, uploaded 18 April 2019]
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Abstract

Cemented paste backfill (CPB) consists of a mixture of fine particles, mainly consisting of tailings and cement dispersed in water. Therefore, it is necessary to introduce an intensive shearing force into the paste during mixing in order to maintain an equilibrium between agglomeration and dispersion. It is influential for the macroscopical fluidity and rheological properties when changes occur in the microstructure of CPB under shear. However, the research on how mixing affects the properties of CPB is still in its infancy. This paper puts an insight into the relation between the mixing intensity and the rheological behavior of the CPB. It can be demonstrated that two threshold mixing intensities exist in this process. After passing the first or lower threshold, the rheological parameters (yield stress and viscosity) of the paste decrease. After passing the second threshold, a continued increase is observed. The changes in rheological properties are connected with physical and chemical changes in the microstructure of the CPB. The results are discussed in light of the three concepts “structural breakdown”, “thixotropic breakdown”, and “thixotropic behavior” of rheological properties of CPB. View Full-Text
Keywords: rheology; microstructure; flow behavior; cemented paste backfill; mixing rheology; microstructure; flow behavior; cemented paste backfill; mixing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yang, L.; Wang, H.; Li, H.; Zhou, X. Effect of High Mixing Intensity on Rheological Properties of Cemented Paste Backfill. Minerals 2019, 9, 240.

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