Experiment on Correlation Between Rheological Properties of Filling Slurry with Different Mass Concentration and Mixed Aggregate Gradation

doi:10.12068/j.issn.1005-3026.2020.05.006

Abstract

Abstract: In order to explore the effects of mixed aggregate ratio and particle size gradation on the rheological properties of the slurry，firstly， the particle size of the waste rock， rod mill sand and the mixture of them commonly used in filling was analyzed， and the corresponding characteristic particle size was obtained.Secondly， the slurry with different aggregate ratios and different mass concentrations was prepared by rheometer. The rheological parameters were fitted by H-B rheological model. Then，the rheological parameters and rheological properties were analyzed， and the correlation between aggregate size distribution and rheological properties of slurry was studied based on least square method.Finally， the stability of slurry is discussed， and the critical particle size range of non-settling segregation of aggregate is 13.8~21.6mm by establishing mechanical model. The test results show that the yield stress and apparent viscosity of the slurry increase with the increase of slurry mass concentration. The rheological properties of slurry show different model characteristics with the increase of shear rate. The correlation between rheological properties parameters of slurry and aggregate particle size distribution increases with the increase of characteristic particle size. With the increase of mass concentration， the correlation between slurry yield stress and aggregate size gradation gradually decreases， while apparent viscosity gradually increases. The mass concentration and aggregate size gradation have a great influence on slurry stability.

Key words: filling slurry, rheological properties, mixed aggregate, mass concentration, particle size gradation, correlation

CLC Number:

TD853
X751

WEN Zhen-jiang， GAO Qian， WANG Yong-ding， HE Jian-yuan. Experiment on Correlation Between Rheological Properties of Filling Slurry with Different Mass Concentration and Mixed Aggregate Gradation[J]. Journal of Northeastern University Natural Science, 2020, 41(5): 642-648.

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