Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes
Article
Article Title | Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes |
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ERA Journal ID | 4164 |
Article Category | Article |
Authors | Yang, Tao (Author), Zhu, Huajun (Author), Zhang, Zuhua (Author), Gao, Xuan (Author), Zhang, Changsen (Author) and Wu, Qisheng (Author) |
Journal Title | Cement and Concrete Research |
Journal Citation | 109, pp. 198-207 |
Number of Pages | 10 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | Oxford, United Kingdom |
ISSN | 0008-8846 |
1873-3948 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconres.2018.04.008 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0008884618301273#ac0005 |
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. |
Keywords | fly ash microsphere; alkali-activated cement (D); rheology (A); microstructure (B) |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Yancheng Institute of Technology, China |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID DE170101070 |
https://research.usq.edu.au/item/q4zq3/effect-of-fly-ash-microsphere-on-the-rheology-and-microstructure-of-alkali-activated-fly-ash-slag-pastes
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