Metakaolin-based geopolymers: Relation between formulation, physicochemical properties and efflorescence formation
Article
Article Title | Metakaolin-based geopolymers: Relation between formulation, physicochemical properties and efflorescence formation |
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ERA Journal ID | 4883 |
Article Category | Article |
Authors | Longhi, Marlon A. (Author), Rodriguez, Erich D. (Author), Walkley, Brant (Author), Zhang, Zuhua (Author) and Kirchheim, Ana Paula (Author) |
Journal Title | Composites Part B: Engineering |
Journal Citation | 182, pp. 1-15 |
Article Number | 107671 |
Number of Pages | 15 |
Year | 2020 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-8368 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compositesb.2019.107671 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1359836819344014 |
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. |
Keywords | Alkali-activated cement (AAC); Geopolymer; Metakaolin; Efflorescence; Leaching |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Byline Affiliations | Centre for Future Materials |
Federal University of Santa Maria, Brazil | |
University of Sheffield, United Kingdom | |
Federal University of Rio Grande do Sul, Brazil | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5862/metakaolin-based-geopolymers-relation-between-formulation-physicochemical-properties-and-efflorescence-formation
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