Rheological performance of fresh nano-metakaolin cement pastes

被引：0
|
作者：
Li Q. [1 ]
Fan Y. [1 ]
Chen H. [1 ]
机构：
[1] Department of Civil Engineering, Dalian Maritime University, Dalian
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2021年 / 51卷 / 03期
关键词：
Cement pastes; Nano-metakaolin; Rheological properties; Thixotropy; Viscosity prediction;
D O I：
10.3969/j.issn.1001-0505.2021.03.017
中图分类号：
学科分类号：
摘要：
To investigate the effects of nano-metakaolin (NMK) on the rheological properties of fresh cement paste, the rheological test of cement paste with various NMK contents (1%, 3%, 5%, 10%, 15%) was developed, under the effects of the water-binder ratio (0.40, 0.45, 0.50) and superplasticizer (SP) addition. The rheological parameters of NMK cement pastes such as apparent viscosity, yield stress, and plastic viscosity were obtained. The effects of NMK on rheological properties were discussed in detail. The viscosity of NMK cement pastes was predicted by the modified Krieger-Dougherty model, and the relationship between flowability and rheological parameters was established. The results show that when NMK is added, the apparent viscosity, yield stress and plastic viscosity are increased, and the fluidity decreases. When the water-binder mass ratio is 0.50 and the content of NMK is 15%, the yield stress and plastic viscosity of cement pastes are increased by 6 times and 9 times, respectively, and the fluidity decreases by about 50%. The flocculation structures and thixotropy are increased when NMK is added. The modified Krieger-Dougherty model can accurately predict the viscosity of lower contents (< 3%) NMK cement pastes. The relationships between fluidity and viscosity, yield stress, plastic viscosity all obey power function. © 2021, Editorial Department of Journal of Southeast University. All right reserved.
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页码：480 / 488
页数：8
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