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首页> 外文OA文献 >Integration approach of the Couette inverse problem of powder-type self-compacting concrete in a wide-gap concentric cylinder rheometer Part II. Influence of mineral additions and chemical admixtures on the shear thickening flow behaviour of powder type self-compacting concrete
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Integration approach of the Couette inverse problem of powder-type self-compacting concrete in a wide-gap concentric cylinder rheometer Part II. Influence of mineral additions and chemical admixtures on the shear thickening flow behaviour of powder type self-compacting concrete

机译：宽间隙同心圆柱流变仪中粉状自密实混凝土库埃特反问题的积分方法第二部分。矿物和化学外加剂对粉末型自密实混凝土剪切增稠流动特性的影响

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The influence of mineral additions and chemical admixtures on the shear thickening flow behaviour of powder type self-compacting concrete (SCC) is studied by means of a wide-gap concentric cylinder rheometer. The Couette inverse problem is treated by means of the integration method in order to derive the flow curve tau(gamma_dot) from the torque measurements.According to the experimental results, the shear thickening effect is found to be strongly influenced by the addition of the chemical admixture (a polycarboxylate ether based superplasticizer), whereas mineral additions were found to modify the intensity of shear thickening. The limestone, quartzite and fly ash addition used in this research project, respectively increase, unalter and decrease the shear thickening intensity. The powder volume and the available amount of free water proved to have a major impact on the viscosity of the powder type SCC mixes. Increasing the powder volume or decreasing the amount of free water results in an increased viscosity of the SCC mix.
机译：利用宽间隙同心圆柱流变仪研究了矿物添加物和化学外加剂对粉末型自密实混凝土（SCC）的剪切增稠流动行为的影响。通过积分方法处理库埃特逆问题，以便从扭矩测量中得出流量曲线tau（gamma_dot）。根据实验结果，发现剪切增稠效果受化学添加剂的强烈影响外加剂（一种基于聚羧酸醚的高效减水剂），而添加矿物质可以改变剪切增稠的强度。本研究项目中使用的石灰石，石英岩和粉煤灰分别增加，不变和减小剪切增稠强度。事实证明，粉末体积和可用的游离水量对粉末型SCC混合物的粘度具有重大影响。增加粉末体积或减少游离水量会导致SCC混合物的粘度增加。

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