Influence of quicklime addition on the mechanical properties and hydration degree of blended cements containing different fly ashes

Antiohos, SK; Papageorgiou, A; Papadakis, VG; Tsimas, S

dc.contributor.author	Antiohos, SK	en
dc.contributor.author	Papageorgiou, A	en
dc.contributor.author	Papadakis, VG	en
dc.contributor.author	Tsimas, S	en
dc.date.accessioned	2014-03-01T01:28:41Z
dc.date.available	2014-03-01T01:28:41Z
dc.date.issued	2008	en
dc.identifier.issn	0950-0618	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18914
dc.subject	Chemical activation	en
dc.subject	High-calcium fly ash	en
dc.subject	k-Value	en
dc.subject	Microstructure	en
dc.subject	Reaction rate	en
dc.subject	Reactive silica	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Fly ash	en
dc.subject.other	Hydration	en
dc.subject.other	Lime	en
dc.subject.other	Microstructure	en
dc.subject.other	Pozzolan	en
dc.subject.other	Reaction rates	en
dc.subject.other	Silica	en
dc.subject.other	High calcium fly ash	en
dc.subject.other	Hydration products	en
dc.subject.other	Reactive silica	en
dc.subject.other	Reactivity development	en
dc.subject.other	Slag cement	en
dc.title	Influence of quicklime addition on the mechanical properties and hydration degree of blended cements containing different fly ashes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.conbuildmat.2007.02.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.conbuildmat.2007.02.001	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Even though the use of pozzolanic and latent hydraulic materials (such as fly ash, slag and natural pozzolans) in the construction sector is nowadays a common practice, certain deficits associated with these materials have initiated research that aims to reduce the negative effects that they introduce into cementitious systems. With respect to fly ash, its relatively slow pozzolanic reactivity hinders its greater utilization; hence cost efficient methods of activation are on demand. In this work, cement systems containing the two typical types of Hellenic fly ashes (of high and moderate calcium content) were chemically activated by adding industrially produced quicklime. A first step in assessing the efficiency of the above procedure was based in monitoring the compressive strength development, lime depletion values and data derived from a selective dissolution procedure (based on a mixture of picric acid-methanol). Moreover, evolution of the fly ash reaction and the morphology of the formed hydration products were examined by means of scanning electron microscopy. Evidence included in this investigation reveal that quicklime presence accelerated the reaction rate of high-calcium fly ash, whereas in the case of lower-calcium fly ash, quicklime had a positive impact only during the very early stages of hydration and thereafter acted inhibitory with respect to its reactivity development. (C) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Construction and Building Materials	en
dc.identifier.doi	10.1016/j.conbuildmat.2007.02.001	en
dc.identifier.isi	ISI:000255473200023	en
dc.identifier.volume	22	en
dc.identifier.issue	6	en
dc.identifier.spage	1191	en
dc.identifier.epage	1200	en