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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/208699
- Title
- Factors influencing softening temperature and hot-strength of geopolymers
- Author(s)
- Pan, Zhu; Sanjayan, Jay G.
- Abstract
- This paper presents the effects of cation type, silicate concentration, compositions of low-calcium fly ash and test load on softening temperature and hot-strength (loaded while at high temperature) of fly ash-based geopolymers. It was found that softening temperature (Ts ) of sodium (Na) based-geopolymer remained the same (610 °C ± 20 °C) regardless of the silicate concentration, fly ash composition, and test load. However, when the cation was changed from sodium to potassium (K), the Ts increased to 800 °C. Further, when Na/K is mixed, the Ts dropped to 570 °C. Significant increases in hot-strengths (at 530 °C and 730 °C) were found in all geopolymers. This increase in strength was observed to be in conjunction with heat release, indicating an exothermic reaction. Since the reaction between fly ash and activators is exothermic, this reaction is believed to be the reason for the strength gain at high temperatures.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
- Source
- Cement and Concrete Composites, Vol. 34, no. 2 (Feb 2012), pp. 261-264
- Publication year
- 2012
- FOR Code(s)
- 0905 Civil Engineering; 1202 Building
- Keyword(s)
- Alkali activated cement; Compressive strength; Geopolymer; Glass transition; High temperature
- Publisher
- Pergamon
- ISSN
- 0958-9465
- Publisher URL
- http://dx.doi.org/10.1016/j.cemconcomp.2011.09.019
- Copyright
- Copyright © 2011 Elsevier Ltd. All rights reserved.
- Research Projects
-
Investigation of geopolymer-based concretes for the construction of high fire risk infrastructures, Australian Research Council grant number DP0664309
- Peer reviewed
