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首页> 美国卫生研究院文献>Materials >Influence of Nano-SiO2 Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste
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Influence of Nano-SiO2 Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste

机译：纳米SiO2纳米CaCO3和纳米Al2O3对水泥粉煤灰浆体流变性能的影响

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摘要

Rheological curves of cement–fly ash (C–FA) paste incorporating nanomaterials including nano-SiO2 (NS), nano-CaCO3 (NC) and nano-Al2O3 (NA) at different resting times (hydration time of 5 min, 60 min, and 120 min) were tested with a rheometer. The rheological behaviors were described by the Herschel–Bulkley (H–B) model, and the influences of these nanomaterials on rheological properties of C–FA paste were compared. Results show that the types, content of nanomaterials and resting time have great influences on the rheological properties of C–FA paste. Incorporating NS and NA increases yield stress and plastic viscosity, and decreases the rheological index of C–FA paste. When the content of NS and NA were 2 wt%, the rheological index of C–FA paste was less than 1, indicating rheological behavior changes from shear thickening to shear thinning. Meanwhile, with rising resting time, yield stress and plastic viscosity increased significantly, but the rheological index decreased evidently, showing paste takes on shear thinning due to the rise of resting time. However, incorporating 3 wt% NC and the rising of resting time did not change the rheological properties of C–FA paste. These differences are mainly that the specific surface area (SSA) of NS (150 m2/g) and NA (120 m2/g) are much larger than that of NC (40 m2/g). The huge SSA of NS and NA consume lots of free water and these tiny particles accelerate the hydration process during resting time.
机译：掺入包括纳米SiO2（NS），纳米CaCO3（NC）和纳米Al2O3（NA）在内的纳米材料的水泥-粉煤灰（C-FA）糊的流变曲线在不同的静止时间（水合时间为5分钟，60分钟，和120分钟）用流变仪测试。用Herschel-Bulkley（HB）模型描述了流变行为，并比较了这些纳米材料对C-FA糊料流变性质的影响。结果表明，纳米材料的类型，含量和静置时间对C–FA糊的流变性能有很大影响。掺入NS和NA会增加屈服应力和塑性粘度，并降低C-FA糊的流变指数。当NS和NA的含量为2 wt％时，C–FA糊的流变指数小于1，表明流变行为从剪切增稠变为剪切稀化。同时，随着静置时间的增加，屈服应力和塑性粘度显着增加，但流变指数却明显下降，表明糊剂由于静置时间的增加而发生剪切稀化。但是，掺入3 wt％的NC和增加静置时间并没有改变C-FA糊的流变性。这些差异主要是因为NS（150 m 2 / g）和NA（120 m 2 / g）的比表面积（SSA）比NC（40 m 2 / g）。 NS和NA的巨大SSA消耗大量自由水，这些细小颗粒在静止时间内加速了水合作用。

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