Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/43099

TitleMethodology for analysis of the reactivity of coal fly ash using selective dissolution by hydrofluoric acid
Author(s)Reis, R. J. A. C.
Ribeiro, M.
Abrantes, J. C. C.
Camões, Aires
Teixeira, E. R.
Malheiro, R.
Keywordsacid attack
EDS
Fly ash
Rietveld refinement
selective dissolution
SEM
vitreous phase
XRF
Issue dateSep-2016
PublisherTrans Tech Publications Ltd
JournalKey Engineering Materials
CitationReis R. J. A. C., Ribeiro M., Abrantes J. C. C., Camões A., Teixeira E. R., Malheiro R. Methodology for Analysis of the Reactivity of Coal Fly Ash Using Selective Dissolution by Hydrofluoric Acid, Key Engineering Materials, Vol. 711, pp. 1126-1133, doi:10.4028/www.scientific.net/KEM.711.1126, 2016
Abstract(s)The use of some additions as cement replacement has played an important role in the amount of clinker reduction. Due to its huge worldwide availability one of the most important and recognised replace agent is the fly ash, but is also estimated that only 30 to 40% of fly ash is used, although there are some challenges to be overcome, such as the reactive potential quantification. Chemical analysis is typically determined by the oxides content and does not take into account the vitreous and crystalline phase ratio. Therefore, this paper describes in detail one selective dissolution method, based in the hydrofluoric acid attack, to the quantification of the vitreous phase (reactive) and crystalline phases (not reactive). Fly ash from Portuguese Pego thermoelectric power plant was submitted to different attacks. To confirm the method and its effects, chemical and physical analysis were performed, such as STA, XRF, XRD with Rietveld refinement, SEM, EDS and laser diffraction granulometry. The results can be used to quantify the potential reactivity of this type of fly ash. The best results were achieved with 1% hydrofluoric acid attack during 6 hours.
TypeConference paper
URIhttp://hdl.handle.net/1822/43099
ISBN9783035710441
DOI10.4028/www.scientific.net/KEM.711.1126
ISSN1662-9795
Publisher versionhttp://www.scientific.net/KEM.711.1126
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:C-TAC - Artigos em Revistas Internacionais

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