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

Yang, Tao and Zhu, Huajun and Zhang, Zuhua and Gao, Xuan and Zhang, Changsen and Wu, Qisheng (2018) Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes. Cement and Concrete Research, 109. pp. 198-207. ISSN 0008-8846

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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 23 Jan 2019 06:51
Last Modified: 24 Jan 2019 04:54
Uncontrolled Keywords: fly ash microsphere; alkali-activated cement (D); rheology (A); microstructure (B)
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Funding Details:
Identification Number or DOI: https://doi.org/10.1016/j.cemconres.2018.04.008
URI: http://eprints.usq.edu.au/id/eprint/35289

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