超细粉体对水泥净浆流变行为影响研究

发布时间：2018-05-28 22:37

本文选题：超细玻璃粉 + 偏高岭土　；参考：《硅酸盐通报》2017年11期

【摘要】：采用截锥圆模法测定不同掺量超细粉体水泥复合浆液的流动度。采用ZNN-D6B型旋转黏度计研究超细玻璃粉和偏高岭土两种超细粉体对水泥净浆流变行为的影响,得到了剪切速率-剪切应力(γ-τ)曲线和剪切速率-表观粘度(γ-μ_a)曲线,并分别采用宾汉姆模型和赫-巴模型对γ-τ流变曲线进行拟合,得到不同掺量超细玻璃粉-水泥(GP-C)复合浆液和偏高岭土-水泥(MK-C)复合浆液的动切力、塑性粘度、稠度系数和流性指数等流变参数。结果表明:超细粉体的加入降低了复合浆液的流动度。随着掺量的增加,两种复合浆液的宾汉动切力τ_0、塑性粘度η、赫-巴动切力τ_y均逐渐增大,MK-C复合浆液的稠度系数K和流性指数n逐渐减小,GP-C复合浆液的稠度系数K呈现增大-减小-增大的趋势,而流性指数n呈现减小-增大-减小的趋势。所有样本表观粘度μ_a都随着剪切速率的增大而减小,呈现剪切稀释现象。
[Abstract]:The fluidity of cement composite slurry with different content of ultrafine powder was measured by truncated cone circular mode method. The effects of ultrafine glass powder and metakaolin on the rheological behavior of cement paste were studied by ZNN-D6B rotary viscometer. The shear rate-shear stress (纬-蟿) curves and shear rate-apparent viscosity (纬-渭 a) curves were obtained. The rheological curves of 纬-蟿 were fitted by Bingham model and Herba model, respectively, and the dynamic shear force and plastic viscosity of the composite slurry with different contents of superfine glass powder and cement GP-C and metakaolin / cement MK-C were obtained. Rheological parameters such as consistency coefficient and fluidity index. The results showed that the fluidity of the composite slurry was decreased with the addition of ultrafine powder. With the increase of the dosage, The Bingham dynamic shear force 蟿 _ 0, the plastic viscosity 畏 and the Her-bar shear force 蟿 _ y increase gradually the consistency coefficient K and the fluidity index n of the MK-C composite slurry gradually decrease, and the consistency coefficient K of the GP-C composite slurry shows a tendency of increasing, decreasing and increasing. The flow index n shows the trend of decreasing, increasing and decreasing. The apparent viscosity 渭 a of all samples decreased with the increase of shear rate and showed shear dilution phenomenon.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家自然科学基金(41672362) 四川省教育厅重点科研项目(16ZA0099) 地质灾害防治与地质环境保护国家重点实验室项目(SKLGP2015Z010)
【分类号】：TU528

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