In this work, we study the effect of maximum packing fraction of powders on the rheology of geopolymer pastes. A large range of metakaolin powders is generated either by blending or grinding powders. Blends of metakaolin with quartz and limestone are also studied. We show that the compressive packing model is able to predict correctly over a wide range of values the maximum packing fraction of these powders. We show that an increase of the maximum packing of powders leads to a decrease of the viscosity of geopolymer suspension at a constant solid volume fraction. We finally show that the viscosity of studied geopolymer suspensions can be well predicted by the Krieger Dougherty relation. We suggest that the highest potential degree of freedom allowing for the control of the viscosity of geopolymer pastes without modifying the composition of the suspension lies in the maximum packing fraction of the solid powders.

中文翻译：

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粉末最大填充分数对偏高岭土基地质聚合物浆料流变学的影响

在这项工作中，我们研究了粉末最大填充分数对地质聚合物浆料流变学的影响。通过混合或研磨粉末可产生多种偏高岭土粉末。还研究了偏高岭土与石英和石灰石的混合物。我们表明，压缩堆积模型能够在较宽的值范围内正确预测这些粉末的最大堆积分数。我们表明，在恒定的固体体积分数下，粉末最大填充量的增加会导致地质聚合物悬浮液的粘度降低。我们最终表明，所研究的地质聚合物悬浮液的粘度可以通过 Krieger Dougherty 关系很好地预测。我们建议，在不改变悬浮液组成的情况下控制地质聚合物糊剂粘度的最高潜在自由度在于固体粉末的最大填充分数。