Time-dependent characteristics of rheological properties and yield stress evolution of grouting materials

被引：0
作者：
Liu J. [1 ]
Zhao W. [1 ]
Sun B. [1 ]
Jiang T. [1 ]
Wang Q. [1 ]
机构：
[1] Zhejiang University, Hangzhou
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 05期
关键词：
grouting materials; hydration products; network flocculation structure; rheological properties; yield stress;
D O I：
10.15951/j.tmgcxb.23040282
中图分类号：
学科分类号：
摘要：
To investigate the time⁃dependent rheological properties of grouting materials and clarify the mechanism of rheological behavior changing over time, the rheological model and rheological parameters of the grouting materials were studied through rheological experiments to reveal their variations with time. By combining the evolution of the microstructure of the grouting slurry observed through cryo⁃scanning electron microscopy with fluid mechanics theory, the time⁃dependent mechanism of yield stress was investigated. A new yield stress evolution model was established considering the combined effects of the flocculation effect, hydration reaction, and the interaction between aggregates and cement paste. The results show that the rheological model of grouting material conforms to the Herschel⁃Bulkley model, and the yield stress increases over time. The hydration products accumulate gradually on the network flocculation structures, which results in enhancement of the shear resistance and increase in the viscosity of the cement paste, thereby increasing the interaction force between the aggregate particles and cement paste. Therefore, the yield stress of the grouting slurry increases over time. The proposed new yield stress evolution model can better describe the time⁃dependent behavior of the yield stress of cement⁃based materials containing aggregate particles. The research results can provide a theoretical basis for the study of the flow and diffusion of grouting slurry and a deeper understanding of the time⁃dependent rheological behavior of cementitious materials. © 2024 Chinese Society of Civil Engineering. All rights reserved.
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页码：27 / 40
页数：13
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