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Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes

Yang, Tao, Zhu, Huajun, Zhang, Zuhua, Gao, Xuan, Zhang, Changsen, Wu, Qisheng·2018·Cement and Concrete Research

Abstract

Abstract The highly viscous property of alkali silicate-activated cements is one of the critical challenges that hinder their wide application. The present study focuses on ameliorating the rheological performance of sodium silicate-activated fly ash/slag pastes by using fly ash microsphere (FAM), which are highly spherical particles collected from fly ash with electrostatic adsorption classification technology. The FAM particles work as ‘ball-bearings’ in the pastes to reduce the internal friction between fly ash and slag grains, and meanwhile mitigate the agglomeration of flocs and fragmentation to release the locked water. The interrelationship between the FAM particle geometry and plastic viscosity of the paste is well described by the Krieger-Dougherty equation, which supports the proposed mechanisms of ‘ball-bearings’ effects. FAM can work as an inorganic dispersing agent to improve the workability of alkali-activated cement products for a variety of application aspects.

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Metadata

Authors
Yang, T., Zhu, H., Zhang, Z., Gao, X., Zhang, C., & Wu, Q.
Venue
Cement and Concrete Research
Publisher
Elsevier BV
Published
2018-07
Volume
109
Pages
198-207
ISSN
0008-8846 (ISSN-L)
OpenAlex
W2801990711
Cited by
399
References
2
FWCI
24.92
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes. https://app.cochat.ai/papers/10.1016/j.cemconres.2018.04.008
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Yang, T., Zhu, H., Zhang, Z., Gao, X., Zhang, C., & Wu, Q. (2018). Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes. Cement and Concrete Research. https://doi.org/10.1016/j.cemconres.2018.04.008

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