In-situ transition of amorphous gels to Na-P1 zeolite in geopolymer: Mechanical and adsorption properties
Article
Article Title | In-situ transition of amorphous gels to Na-P1 zeolite in geopolymer: Mechanical and adsorption properties |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Zheng, Zhao, Ma, Xue, Zhang, Zuhua and Li, Yuxiang |
Journal Title | Construction and Building Materials |
Journal Citation | 202, pp. 851-860 |
Number of Pages | 10 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2019.01.067 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061819300650?via%3Dihub |
Abstract | Turning amorphous gels of fly ash-based geopolymers into zeolite(s) can improve their adsorption properties for the potential use of wastewater treatment. This study investigates the optimal crystallization conditions under which Na-P1 zeolite forms and the relationship between the extent of crystallization, the resulting microstructure, and the compressive strength. The results indicate that a curing temperature of 90 °C is more effective when forming Na-P1 zeolite in geopolymers than a curing temperature of 60 °C. The most suitable alkali concentration (wt% Na2O/fly ash) and alkali activator modulus (n(SiO2)/n(Na2O)) are 15 and 1.5, respectively. The transition of amorphous gels into crystalline zeolites, i.e., more ordered structures, leads to a certain loss of compressive strength. However, the optimal matrix still retains 13.5 MPa of compressive strength. The cation exchange capacity (CEC) of the geopolymer matrix is demonstrated to be a function of the crystalline extent, and the highest CEC occurs in the optimal in-situ transformed geopolymer. |
Keywords | Geopolymers, Na-P1 zeolite, Crystallization conditions, Compressive strength, Cation exchange capacity |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Southwest University of Science and Technology, China |
Centre of Excellence in Engineered Fibre Composites | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5874/in-situ-transition-of-amorphous-gels-to-na-p1-zeolite-in-geopolymer-mechanical-and-adsorption-properties
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