Influence of fly ash on the pore structure and shrinkage characteristics of metakaolin-based geopolymer pastes and mortars
Article
Article Title | Influence of fly ash on the pore structure and shrinkage characteristics of metakaolin-based geopolymer pastes and mortars |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Yang, Tao (Author), Zhu, Huajun (Author) and Zhang, Zuhua (Author) |
Journal Title | Construction and Building Materials |
Journal Citation | 153, pp. 284-293 |
Number of Pages | 10 |
Year | 2017 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2017.05.067 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061817309595#! |
Abstract | This study investigates the pore structure and shrinkage behavior of metakaolin-based geopolymer pastes and mortars containing 0–30% fly ash. Fly ash substitution decreases average reactivity of the solid precursors, resulting in a lower reaction rate and accompanying longer reaction time. Composition of the sodium aluminosilicate (N-A-S-H) gel formed in the geopolymers has been changed, and the continued reaction after hardening of the pastes generates a more compact binding gel phase with lower Al/Si ratio. Refinement of the pore structure entails a higher capillary tension developed in the binders to increase the autogenous shrinkage, but also restricts the water evaporation from the pore networks, resulting in a decreased drying shrinkage. The geopolymer mortars provide higher compressive strength and lower total shrinkage when compared with the pastes. |
Keywords | Geopolymer cement; Metakaolin; Fly ash; Shrinkage; Pore structure |
ANZSRC Field of Research 2020 | 400505. Construction 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 |
https://research.usq.edu.au/item/q5879/influence-of-fly-ash-on-the-pore-structure-and-shrinkage-characteristics-of-metakaolin-based-geopolymer-pastes-and-mortars
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