Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 52, Issue -, Pages 396-403Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.11.058
Keywords
Class F fly ash; Alkali-activation; Geopolymer; XRD; SEM
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Funding
- Basic Science Research Program through the National Research Foundation of Korea(NRF)
- Ministry of Education, Science and Technology [2012-0003489]
- Future Challenge Project or Creativity and Innovation Project by UNIST(Ulsan National Institute of Science and Technology) [1.120018.01]
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This study presents the preliminary investigation for the microstructural characteristics of the alkali-activated fly ashes, synthesized using six different Korean Class F fly ashes, to address the large mechanical strength differences between the activated ashes using compressive strength testing, XRF, XRD, and SEM/EDS (YAG BSE, SE and elemental mapping). The results show that although the original fly ashes are not much different in XRD and XRF data, the reaction products after activation were dissimilar between the activated ashes. Particularly, the activated sample containing Al-rich chabazite produced much higher compressive strength than the other samples with zeolite A-Na. The SEM/EDS results exhibit that the activated fly ashes tended to have the higher compressive strengths as the reaction products possessed the lower Si/Al ratios down to one. (C) 2013 Elsevier Ltd. All rights reserved.
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