Correlation between water film thickness and rheological parameters of nano-metakaolin cement paste particles

被引：0
|
作者：
Li Q. [1 ]
Fan Y. [1 ]
Li X. [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) | 2022年 / 52卷 / 02期
关键词：
Cement paste; Correlation; Mathematical model; Nano-metakaolin; Rheological parameters; Water film thickness;
D O I：
10.3969/j.issn.1001-0505.2022.02.009
中图分类号：
学科分类号：
摘要：
The effects of nano-metakaolin (NMK) mass fraction (0, 1%, 3%, 5%, 10%), superplasticizer (SP), and water to binder ratio(0.40, 0.45, 0.50) were taken into consideration, and the relationship between the water film thickness (WFT) and rheological parameters of fresh NMK cement paste particles was investigated. The standard consistency water consumption and maximum particle concentration methods were applied to obtain the particle packing density, respectively. The WFT of cement paste particles was calculated by the particle packing density and total specific surface area. The rheological parameters of NMK cement pastes were measured by a rheometer. The bleeding rate of NMK cement pastes was determined by the bleeding test. The results show that NMK leads to a decrease in the packing density and WFT, while the WFT of cement paste particles increases with the increase of the water to binder ratio. It is observed that the packing density and WFT of NMK cement paste increase with SP addition, and the bleeding rate of cement paste decreases significantly with NMK addition. Based on the experimental results, a mathematical model is proposed to predict the rheological parameters (fluidity, yield stress, thixotropy, etc.) of cement paste by the WFT. In addition, the prediction model is verified by the experimental data listed in the literature. Therefore, the proposed model can provide a scientific theoretical basis and reference for predicting the rheological parameters of NMK cement pastes. © 2022, Editorial Department of Journal of Southeast University. All right reserved.
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页码：273 / 281
页数：8
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