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. 2016 Jun 30;9(7):535. doi: 10.3390/ma9070535

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Appearance of FA geopolymer after thermal treatment: (a) flushing of FA paste specimens after heating to 1000 °C; and (b) transverse cracks on FA paste specimens after heating to 600 °C.