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High-calcium fly ash as the fourth constituent in concrete: Problems, solutions and perspectives

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dc.contributor.author Tsimas, S en
dc.contributor.author Moutsatsou-Tsima, A en
dc.date.accessioned 2014-03-01T11:44:40Z
dc.date.available 2014-03-01T11:44:40Z
dc.date.issued 2005 en
dc.identifier.issn 0958-9465 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/37077
dc.subject Compressive strength en
dc.subject Concrete en
dc.subject Fly ash treatment en
dc.subject High-calcium fly ash en
dc.subject.classification Construction & Building Technology en
dc.subject.classification Materials Science, Composites en
dc.subject.other Composition en
dc.subject.other Compressive strength en
dc.subject.other Construction en
dc.subject.other Data acquisition en
dc.subject.other Grinding (comminution) en
dc.subject.other Hydration en
dc.subject.other Industrial applications en
dc.subject.other Strength of materials en
dc.subject.other Concrete en
dc.subject.other Fly ash treatment en
dc.subject.other High-calcium fly ash en
dc.subject.other Mineralogical composition en
dc.subject.other Cements en
dc.title High-calcium fly ash as the fourth constituent in concrete: Problems, solutions and perspectives en
heal.type other en
heal.identifier.primary 10.1016/j.cemconcomp.2004.02.012 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.cemconcomp.2004.02.012 en
heal.language English en
heal.publicationDate 2005 en
heal.abstract Even though Hellenic high-calcium fly ashes of different origin are widely used by the cement industry for the production of several CEM II types of cements according to EN 197-1, their systematic use in concrete still presents some difficulties. This inhibits the establishment of specifications for their addition. Main problems concerning the quality, are focused on variations in chemical and mineralogical composition, necessity for supplementary grinding, high proportion of free-CaO and periodically high proportion of SO3 content. These problems as well as the solutions, for every day use by the concrete industry, applied during the construction of a dam. are discussed, in this paper. To overcome these problems, untreated fly ash was cheaply upgraded by grinding at a specially designed ball mill, with simultaneously hydration, for the reduction of free-CaO. Details also (i) for fly ash variations in relation to their origin, (ii) the grinding plant and (iii) the industrial production of fly ash. are given. Finally, in a separate chapter of this paper, aiming to explain the treatment of fly ashes followed during their industrial production, data of the mechanical strength of mixtures of cements incorporating fly ashes with different treatment, concerning their free-CaO and their fineness, are given. (C) 2004 Elsevier Ltd. All rights reserved. en
heal.publisher ELSEVIER SCI LTD en
heal.journalName Cement and Concrete Composites en
dc.identifier.doi 10.1016/j.cemconcomp.2004.02.012 en
dc.identifier.isi ISI:000226478000012 en
dc.identifier.volume 27 en
dc.identifier.issue 2 en
dc.identifier.spage 231 en
dc.identifier.epage 237 en


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