Zheng, Zhao and Ma, Xue and Zhang, Zuhua and Li, Yuxiang (2019) In-situ transition of amorphous gels to Na-P1 zeolite in geopolymer: Mechanical and adsorption properties. Construction and Building Materials, 202. pp. 851-860. ISSN 0950-0618
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.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Files associated with this item cannot be displayed due to copyright restrictions. |
| Faculty/School / Institute/Centre: | Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -) |
| Faculty/School / Institute/Centre: | Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -) |
| Date Deposited: | 28 Jan 2020 04:08 |
| Last Modified: | 30 Jan 2020 02:58 |
| Uncontrolled Keywords: | Geopolymers, Na-P1 zeolite, Crystallization conditions, Compressive strength, Cation exchange capacity |
| Fields of Research (2008): | 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials |
| Socio-Economic Objectives (2008): | B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials |
| Identification Number or DOI: | https://doi.org/10.1016/j.conbuildmat.2019.01.067 |
| URI: | http://eprints.usq.edu.au/id/eprint/37698 |
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