SiO2微粉浆体的流变性研究

Study on rheological property of silica fume slurries

利用流变仪研究了改变SiO2微粉种类（其d50分别为0.202、3.457、5.789μm,w（SiO2）分别为96.70%、93.64%、93.00%）、浆体中SiO2微粉的体积分数（分别为15%、20%、25%、30%）和分散剂（分别为一水柠檬酸和三聚磷酸钠）时SiO2微粉浆体流变性的差异,并定量计算了SiO2微粉浆体相应的流变参数。试验结果发现：在0-300 s^-1的剪切采集区域内,不同条件下测得的流变曲线均符合Bingham流体模型;加入分散剂三聚磷酸钠和一水柠檬酸能明显改善SiO2微粉浆体的流变性,且两者的分散效果有所差异。

The rheological behaviors of silica fume slurries were investigated by changing the variety of silica fume （ d50 =0. 202,3. 457,5. 789 μm, w（ SiO2 ） = 96.70% ,93.64% ,93.00%, respectively） ,the volume percent of silica fume in slurry （15% ,20% ,25% and 30%, respectively） and dispersant （monohydrate citric acid and sodium tripolyphosphate）, and the relevant rheological parameters were also quantificationally deter- mined. The results showed that in the shear rate from 0 to 300 s^-1,all rheological curves measured under different conditions were coincident with Bingham fluid model; the rheological behaviors of the slurries with sodium tripolyphosphate and monohydrate citric acid could be significantly improved and the dispersion effects of them were different.