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Materials 2016, 9(7), 598; doi:10.3390/ma9070598

Benefits of Sealed-Curing on Compressive Strength of Fly Ash-Based Geopolymers

1
Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2
Department of Resources Recycling Engineering, University of Science and Technology, Daejeon 34113, Korea
3
John de Laeter Centre, Curtin University, Perth 6845, Western Australia, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Claudio Ferone
Received: 27 June 2016 / Revised: 10 July 2016 / Accepted: 15 July 2016 / Published: 20 July 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
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Abstract

There is no standardized procedure for producing geopolymers; therefore, many researchers develop their own procedures for mixing and curing to achieve good workability and strength development. The curing scheme adopted is important in achieving maximum performance of resultant geopolymers. In this study, we evaluated the impact of sealed and unsealed curing on mechanical strength of geopolymers. Fly ash-based geopolymers cured in sealed and unsealed moulds clearly revealed that retention of water during curing resulted in superior strength development. The average compressive strength of sealed-cured geopolymers measured after 1 day of curing was a modest 50 MPa, while after 7 day curing the average compressive strength increased to 120~135 MPa. In the unsealed specimens the average compressive strength of geopolymers was lower; ranging from 60 to 90 MPa with a slight increase as the curing period increased. Microcracking caused by dehydration is postulated to cause the strength decrease in the unsealed cured samples. These results show that water is a crucial component for the evolution of high strength three-dimensional cross-linked networks in geopolymers. View Full-Text
Keywords: geopolymers; curing regime; strength development geopolymers; curing regime; strength development
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, S.; van Riessen, A.; Chon, C.-M. Benefits of Sealed-Curing on Compressive Strength of Fly Ash-Based Geopolymers. Materials 2016, 9, 598.

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