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Experimental study on the rheological behavior of ultra-fine cemented backfill

机译：超细胶结回填物流变特性的试验研究

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Ultra-fine cemented backfill (UCB) materials display distinctive rheological characteristics. This paper examines the rheological behaviors of UCB composited with cement and tailings that have a 80% cumulative passing size (d((80))) of 9.72 mu m. The findings were that UCB samples exhibit time-dependent non Newtonian behaviors with a shear thinning characteristic, and both thixotropy and rheopexy properties are observed under long periods of steady-state shearing (300 s(-1) shear rate). The results indicate that samples sheared at higher rates display lower apparent viscosities compared to the samples sheared at lower rates. At low shear rates (<= 0.5 s(-1)), apparent viscosity increased until it reached a local peak (or two peaks) before behaving similarly to samples tested at higher shear rates. It was also found that the apparent viscosity of UCB increased consistently as the solids content was increased. Moreover, as cement content was increased, the apparent viscosity rose until it reached a peak at a cement content of 6%. The results also confirmed effects of solids concentration profiles changing over time and the cement hydration on the rheological behavior of UCB. (c) 2017 Elsevier Ltd. All rights reserved.
机译：超细水泥回填（UCB）材料显示出独特的流变特性。本文研究了水泥和尾矿的UCB的流变行为，该尾矿具有80％的累积通过尺寸（d（（80）））为9.72微米。研究结果表明，UCB样品具有随时间变化的非牛顿行为，具有剪切稀化特性，并且在长时间的稳态剪切（300 s（-1）剪切速率）下均具有触变性和流变性能。结果表明，与以较低速率剪切的样品相比，以较高速率剪切的样品显示出较低的表观粘度。在低剪切速率（<= 0.5 s（-1））下，表观粘度增加，直到达到局部峰值（或两个峰值），然后才能与在较高剪切速率下测试的样品相似。还发现随着固体含量的增加，UCB的表观粘度持续增加。此外，随着水泥含量的增加，表观粘度上升直至在水泥含量为6％时达到峰值。结果还证实了固体浓度曲线随时间变化以及水泥水化对UCB流变行为的影响。 （c）2017 Elsevier Ltd.保留所有权利。

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