Longhi, M.A., Rodríguez, E.D., Walkley, B. orcid.org/0000-0003-1069-1362 et al. (2 more authors) (2020) Metakaolin-based geopolymers: Relation between formulation, physicochemical properties and efflorescence formation. Composites Part B: Engineering, 182. 107671. ISSN 1359-8368
Abstract
The efflorescence formation in metakaolin-based geopolymers is assessed in this study to provide a better understanding of the effect of the synthesis parameters. Efflorescence formation depends on the physical and chemical properties of geopolymers as well as the environmental exposure conditions. In this study a set of fifteen geopolymers were synthesized using different formulation. An accelerated test of efflorescence development is presented, where the grade of degradation was evaluated by visual observation and correlated to leaching potential, physical properties and microstructural features. The use of soluble silicate in the activator provides a denser and a less permeable matrix. This makes the extraction of free alkalis to the surface more difficult, reducing the extent of alkali leaching and therefore efflorescence. The use of K+ is also effective to reduce visible efflorescence. The efflorescence formation is predicted by the properties of the gel formed which are dependent on the mix proportioning.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2019 Elsevier Ltd. This is an author produced version of a paper subsequently published in Composites Part B: Engineering. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Alkali-activated cement (AAC); Geopolymer; Metakaolin; Efflorescence; Leaching |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/P013171/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 28 Feb 2020 13:41 |
Last Modified: | 30 Nov 2020 01:51 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.compositesb.2019.107671 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157833 |