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The Influence of Chemical Admixtures on the Fluidity, Viscosity and Rheological Properties of Ultra-High Performance Concrete

Jin Yang1,2, Hailong Zhao1, Jingyi Zeng1, Ying Su1,2, Mengdi Zhu1, Xingyang He1,2,*

1 School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China
2 Building Waterproof Engineering and Technology Research Center of Hubei Province, Hubei University of Technology, Wuhan, 430068, China

* Corresponding Author: Xingyang He. Email: email

Fluid Dynamics & Materials Processing 2024, 20(10), 2163-2181. https://doi.org/10.32604/fdmp.2024.055448

Abstract

To achieve higher strength and better durability, ultra-high performance concrete (UHPC) typically employs a relatively small water-binder ratio. However, this generally leads to an undesired increase in the paste viscosity. In this study, the effects of liquid and powder polycarboxylate superplasticizers (PCE) on UHPC are compared and critically discussed. Moreover, the following influential factors are considered: air-entraining agents (AE), slump retaining agents (SA), and defoaming agents (DF) and the resulting flow characteristics, mechanical properties, and hydration properties are evaluated assuming UHPC containing 8‰ powder PCE (PCE-based UHPC). It is found that the spread diameter of powder PCE is 5% higher than that of liquid PCE. Among the chemical admixtures studied, AEs have the best effect on improving UHPC workability, while DFs have the worst effect. When the addition of AE and SA is 1.25‰ and 14.7% of PCE, paste viscosity reduces by 35% and 19%, respectively compared to the paste with only 8‰ PCE. A low AE dosage (1.25‰) decreases compressive strength by 4.1%, while SA (8.1%) increases UHPC compressive strength by 9.1%. Both AE and SA significantly delay the UHPC hydration process, reducing the hydration heat release peaks by 76% and 27%, respectively.

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APA Style
Yang, J., Zhao, H., Zeng, J., Su, Y., Zhu, M. et al. (2024). The influence of chemical admixtures on the fluidity, viscosity and rheological properties of ultra-high performance concrete. Fluid Dynamics & Materials Processing, 20(10), 2163-2181. https://doi.org/10.32604/fdmp.2024.055448
Vancouver Style
Yang J, Zhao H, Zeng J, Su Y, Zhu M, He X. The influence of chemical admixtures on the fluidity, viscosity and rheological properties of ultra-high performance concrete. Fluid Dyn Mater Proc. 2024;20(10):2163-2181 https://doi.org/10.32604/fdmp.2024.055448
IEEE Style
J. Yang, H. Zhao, J. Zeng, Y. Su, M. Zhu, and X. He "The Influence of Chemical Admixtures on the Fluidity, Viscosity and Rheological Properties of Ultra-High Performance Concrete," Fluid Dyn. Mater. Proc., vol. 20, no. 10, pp. 2163-2181. 2024. https://doi.org/10.32604/fdmp.2024.055448



cc Copyright © 2024 The Author(s). Published by Tech Science Press.
This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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