Metakaolin as a main cement constituent. Exploitation of poor Greek kaolins

Badogiannis, E; Kakali, G; Dimopoulou, G; Chaniotakis, E; Tsivilis, S

dc.contributor.author	Badogiannis, E	en
dc.contributor.author	Kakali, G	en
dc.contributor.author	Dimopoulou, G	en
dc.contributor.author	Chaniotakis, E	en
dc.contributor.author	Tsivilis, S	en
dc.date.accessioned	2014-03-01T01:22:44Z
dc.date.available	2014-03-01T01:22:44Z
dc.date.issued	2005	en
dc.identifier.issn	0958-9465	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16638
dc.subject	Cement	en
dc.subject	Hydration	en
dc.subject	Metakaolin	en
dc.subject	Setting	en
dc.subject	Strength	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.other	Heat treatment	en
dc.subject.other	Hydrated lime	en
dc.subject.other	Hydration	en
dc.subject.other	Kaolin	en
dc.subject.other	Silica	en
dc.subject.other	Strength of materials	en
dc.subject.other	Thermogravimetric analysis	en
dc.subject.other	X ray diffraction analysis	en
dc.subject.other	Hydration products	en
dc.subject.other	Kaolinite	en
dc.subject.other	Metakaolin	en
dc.subject.other	Cements	en
dc.title	Metakaolin as a main cement constituent. Exploitation of poor Greek kaolins	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.cemconcomp.2004.02.007	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.cemconcomp.2004.02.007	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	In this work, the properties and the hydration procedure of cements containing metakaolin were monitored for periods up to 180 days. Four metakaolins, derived from poor Greek kaolins, as well as a commercial metakaolin of high purity were used. Cement mortars and pastes, with 0%, 10% and 20% replacement of cement with the above metakaolins, were examined. Strength development, water demand and setting time were determined in all samples. In addition, XRD and TGA were applied in order to study the hydration products and the hydration rate in the cement-metakaolin pastes. It is concluded that metakaolin has a very positive effect on the cement strength after 2 days and specifically at 28 and 180 days. The blended cements demand significantly more water than the relatively pure cement and the water demand increase is higher. the higher the metakaolin content. The produced metakaolins as well as the commercial one give similar hydration products after 28 days and the pozzolanic reaction is accelerated between 7 and 28 days, accompanied by a steep decrease of Ca(OH)(2) content. Finally. it is concluded that a 10% metakaolin content seems to be, generally, more favorable than 20%. The produced metakaolins. derived from poor Greek kaolins. as well as the commercial one impart similar properties with respect to the cement strength development, the setting and the hydration. (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.2004.02.007	en
dc.identifier.isi	ISI:000226478000007	en
dc.identifier.volume	27	en
dc.identifier.issue	2	en
dc.identifier.spage	197	en
dc.identifier.epage	203	en