Quality characteristics of Greek fly ashes and potential uses

Skodras, G; Grammelis, P; Kakaras, E; Karangelos, D; Anagnostakis, M; Hinis, E

dc.contributor.author	Skodras, G	en
dc.contributor.author	Grammelis, P	en
dc.contributor.author	Kakaras, E	en
dc.contributor.author	Karangelos, D	en
dc.contributor.author	Anagnostakis, M	en
dc.contributor.author	Hinis, E	en
dc.date.accessioned	2014-03-01T01:26:57Z
dc.date.available	2014-03-01T01:26:57Z
dc.date.issued	2007	en
dc.identifier.issn	0378-3820	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18302
dc.subject	Chemical analysis	en
dc.subject	Combustion residues	en
dc.subject	Radioactivity	en
dc.subject	Utilisation	en
dc.subject.classification	Chemistry, Applied	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Chemical analysis	en
dc.subject.other	Codes (standards)	en
dc.subject.other	Fly ash	en
dc.subject.other	Lignite	en
dc.subject.other	Measurement theory	en
dc.subject.other	Radioactivity	en
dc.subject.other	Spectroscopic analysis	en
dc.subject.other	Combustion residues	en
dc.subject.other	Greek fly ashes	en
dc.subject.other	Raw fuel	en
dc.subject.other	Utilisation	en
dc.subject.other	Coal fired boilers	en
dc.title	Quality characteristics of Greek fly ashes and potential uses	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.fuproc.2006.09.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.fuproc.2006.09.001	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The main characteristics of fly ash from Greek coal-fired boilers are presented in this paper in relation to its exploitation potential. Both fuel and fly ash samples were collected and analyzed according to the ASTM Standards. Apart from the typical analyses (proximate, ultimate, ash analysis and calorific value), an ICP-AES spectrometer was used for the analysis of heavy metals in the ash. Experimental measurements in order to determine the radioactivity content of raw fuel and the fly ash were carried out as well. A representative fly ash sample from Ptolemais power plant was evaluated and tested as filler in Self-Compacting Concrete (SCC). Ashes from the Greek brown coal are classified in type C, most of the fly ash being produced in Ptolemais of Northern Greece, while the rest in Megalopolis. Ptolemais fly ash is rich in calcium compounds, while Megalopolis fly ash contains more pyrite. Increased heavy metal concentrations are observed in the fly ash samples of Greek coal. Greek fly ash appears to have not only pozzolanic but also hydraulic behaviour. Furthermore, Greek fly ash, depending on its origin, may have relatively high natural radioactivity content, reaching in the case of Megalopolis fly ash 1 kBq kg(-1) of Ra-226. The laboratory results showed that fly ashes can be a competitive substitute to conventional limestone filler material in SCC. Fly ash is mostly used in Greece in cement industry replacing cement clinker and aiming to the production of special types of Portland cements. However, a more aggressive utilisation strategy should be developed, since low quantities of the total produced fly ash are currently further utilised. (C) 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Fuel Processing Technology	en
dc.identifier.doi	10.1016/j.fuproc.2006.09.001	en
dc.identifier.isi	ISI:000243798900009	en
dc.identifier.volume	88	en
dc.identifier.issue	1	en
dc.identifier.spage	77	en
dc.identifier.epage	85	en