The influence of biogenic micro-silica-rich rocks on the properties of blended cements

Starnatakis, MG; Fragoulls, D; Csirik, G; Bedelean, I; Pedersen, S

dc.contributor.author	Starnatakis, MG	en
dc.contributor.author	Fragoulls, D	en
dc.contributor.author	Csirik, G	en
dc.contributor.author	Bedelean, I	en
dc.contributor.author	Pedersen, S	en
dc.date.accessioned	2014-03-01T01:53:14Z
dc.date.available	2014-03-01T01:53:14Z
dc.date.issued	2003	en
dc.identifier.issn	0958-9465	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26892
dc.subject	diatomite	en
dc.subject	amorphous silica	en
dc.subject	opal-A	en
dc.subject	cement	en
dc.subject	pozzolana	en
dc.subject	compressive strength	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.other	ISLAND	en
dc.subject.other	GREECE	en
dc.title	The influence of biogenic micro-silica-rich rocks on the properties of blended cements	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Diatomaceous rock samples of a different origin and with amorphous, biogenic micro-silica (opal-A) as their major siliceous constituents were studied and their behaviour as a cement additive was determined. The raw materials were collected from Hungary, Romania and Greece. These diatomite rocks varied in geological age from Miocene to Pleistocene, and were deposited respectively in lacustrine, brackish and marine conditions. The depositional environment affected the size of the opal-A particles, those of lacustrine origin being the smaller (<10 mum). Most of the opal-A particles were represented by disk-shaped diatom frustules. Laboratory tests showed that these diatomite rocks exhibited good pozzolanic properties and could replace the most commonly used natural pozzolanas. The use of diatomaceous rocks as cement additives has drawbacks such as higher water demand, but the compressive strength of the laboratory produced cements exhibit higher values than OPC. The highest compressive strength values were obtained with the use of the Hungarian diatomite rock that had the greatest amount of reactive silica content reflecting its high opal-A content. (C) 2002 Published by Elsevier Science Ltd.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	CEMENT & CONCRETE COMPOSITES	en
dc.identifier.isi	ISI:000181186500003	en
dc.identifier.volume	25	en
dc.identifier.issue	2	en
dc.identifier.spage	177	en
dc.identifier.epage	184	en