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Jun, Yubin
Construction Materials Lab
Research Interests
  • Construction materials
  • Concrete deterioration and durability

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Microstructural characterization of alkali-activation of six korean class F fly ashes with different geopolymeric reactivity and their zeolitic precursors with various mixture designs

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Title
Microstructural characterization of alkali-activation of six korean class F fly ashes with different geopolymeric reactivity and their zeolitic precursors with various mixture designs
Author
Jun, YubinOh, Jae Eun
Issue Date
2015-09
Publisher
대한토목학회
Citation
KSCE JOURNAL OF CIVIL ENGINEERING, v.19, no.6, pp.1775 - 1786
Abstract
This study presents the mechanical strength testing results for alkali-activation of six different Class F fly ashes under varying activator/binder ratios, activator concentrations and curing temperature histories. It also reports on the synthesis of two functional zeolitic precursors formed in the fly ash geopolymerization: (1) nitrate sodalite, which may possess a relatively good Cation Exchange Capacity (CEC) for heavy metals; and (2) (basic) nitrite sodalite, which can be used for CO2 absorption. The mechanical strengths of the alkali-activated fly ashes are found to be more affected by the activator/binder ratio than the other variables. The nitrate sodalite and basic nitrite sodalite are identified in both X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) images by showing ‘balls of yarn’ shapes. The presence of these crystalline products not only influences strength development in the alkali-activated fly ash samples but may also provide value-added properties for the geopolymer binder.
URI
https://scholarworks.unist.ac.kr/handle/201301/10747
URL
http://link.springer.com/article/10.1007%2Fs12205-015-0132-7
DOI
10.1007/s12205-015-0132-7
ISSN
1976-3808
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UEE_Journal Papers
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