ORCID
- Long Yuan Li: 0000-0002-5982-0965
Abstract
This paper investigates the effect of varying solid alkali activators on the fresh and hardened properties and microstructural changes of one-part geopolymers (OPGs). Single and binary solid alkali activators were used to activate high calcium fly ash. The alkali activators were either solely sodium metasilicate (Na2SiO3) or a combination of sodium aluminate (NaAlO2) and sodium metasilicate (Na2SiO3). The OPG activated with anhydrous Na2SiO3 achieved an excellent 28-day compressive strength of 83.6 MPa while OPG activated with NaAlO2 and Na2SiO3 attained a compressive strength of 45.1 MPa. The Na2SiO3-activated OPG demonstrated better fluidity than the OPG activated with NaAlO2 and Na2SiO3 due to the thixotropic behaviour caused by the NaAlO2. The Na2SiO3-activated OPG consisted of sodium-calcium aluminium silicate hydrate ((N,C)-A-S-H) gel phase, while the OPG activated with NaAlO2 and Na2SiO3 comprised of the coexistence of sodium aluminium silicate hydrate (N-A-S-H) and calcium aluminium silicate hydrate (C-A-S-H) gel phases. Regardless of the distinctive properties, the OPGs are adequate for building materials applications.
DOI Link
Publication Date
2021-01-01
Publication Title
Journal of Materials Research and Technology
Volume
15
ISSN
2238-7854
Acceptance Date
2021-10-04
Deposit Date
2021-11-11
Embargo Period
2021-11-12
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
First Page
3850
Last Page
3866
Recommended Citation
Wan-En, O., Yun-Ming, L., Cheng-Yong, H., Abdullah, M., Li, L., Ho, L., Loong, F., Shee-Ween, O., Hui-Teng, N., Yong-Sing, N., & Jaya, N. (2021) 'Comparative mechanical and microstructural properties of high calcium fly ash one-part geopolymers activated with Na2SiO3-anhydrous and NaAlO2', Journal of Materials Research and Technology, 15, pp. 3850-3866. Available at: 10.1016/j.jmrt.2021.10.018
