Effects of fly ash source and curing procedure on strength development of geopolymers

Zhang, Z. and Wang, H. and Reid, A. and Aravinthan, T. (2011) Effects of fly ash source and curing procedure on strength development of geopolymers. In: ACMSM 21: Incorporating Sustainable Practice in Mechanics of Structures and Materials, 7-10 Dec 2010, Melbourne, Australia.

Abstract

Fly ash geopolymer is regarded as a 'green' alternative for cement, which can be synthesized at a lower temperature using industrial waste as the major raw materials. Lightweight fly ash geopolymer offers many environmental and commercial advantages. This study compared the mechanical properties of geopolymers by NaOH solution activation of fly ash from different sources. Results showed that the high calcium and iron content in fly ash was the primary reason accounting for the high compressive strength of the corresponding geopolymer sample. High temperature curing at 90 °C caused high shrinkage of geopolymer paste while mild temperature curing at 40 °C resulted in prolonged strength development and lower final strength. To obtain a volume stable foamed geopolymer, a two-step curing procedure was developed with mild temperature 40 °C curing at first following by 90 °C curing.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publisher copyright policy.
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 31 Mar 2011 08:56
Last Modified: 03 Jul 2013 00:35
Uncontrolled Keywords: geopolymers; fly ash
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/18797

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