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Comparative studies of Alkali activated South African Class F and Mongolian Class C fly ashes

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dc.contributor.author Temuujin, J
dc.contributor.author Mapiravana, Joseph
dc.contributor.author Bayarzul, U
dc.contributor.author Oyun-Erdene, G
dc.contributor.author Zolzaya, TS
dc.contributor.author Darkhijav, B
dc.contributor.author Dlamini, Mandla N
dc.contributor.author Rüscher, CH
dc.date.accessioned 2018-08-22T09:38:03Z
dc.date.available 2018-08-22T09:38:03Z
dc.date.issued 2017-03
dc.identifier.citation Temuujin, J, Mapiravana, J, Bayarzul, U. et.al. 2017. Comparative studies of Alkali activated South African Class F and Mongolian Class C fly ashes. Waste and Biomass Valorisation, 14pp. en_US
dc.identifier.issn 1877-2641
dc.identifier.uri https://link.springer.com/article/10.1007/s12649-017-9881-5
dc.identifier.uri http://hdl.handle.net/10204/10379
dc.description Copyright: 2017 Springer. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, kindly consult the publisher's website. en_US
dc.description.abstract The 7 days compressive strength of alkali activation of class C fly ash from Mongolia (Banganuur fly ash) and class F fly ashes from South Africa (Ash Resources, Ulala) were measured, depending on different waterglass (WG) to sodium hydroxide ratios in the activator. FTIR, XRD and SEM analyses were carried out. It is observed that Baganuur fly ash can be activated sufficiently using NaOH-solution only obtaining highest strength (33 MPa), whereas Ulala and Ash Resources almost fails (<10 MPa). The South Africa fly ash gains, however, around 28 MPa using 50:50% WG to NaOH ratios, where the class C-fly ash becomes a bit weaker (24 MPa). The different behavior is explained by formation of different geopolymer-types of network. In the case of class C fly ash alkali activation without the contribution waterglass is sufficient for the formation of amorphous C–S–H type phases due to the structure directing effect of the high amount of Ca-ions. This effect is lost with increasing the waterglass content. The waterglass effect—on the other hand—enforces the strength development for class F-fly ashes with high Al content instead of high Ca. Here network is formed mainly via preliminary chain formation due to condensation of the waterglass followed by cross-linking the chains via sialate linkages. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.relation.ispartofseries Worklist;20636
dc.subject Alkaline solution en_US
dc.subject Class F-fly ash en_US
dc.subject Class C-fly ash en_US
dc.subject Geopolymers en_US
dc.subject Microstructure en_US
dc.title Comparative studies of Alkali activated South African Class F and Mongolian Class C fly ashes en_US
dc.type Article en_US


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