Properties and hydration of blended cements with mineral alunite

Katsioti, M; Giannikos, D; Tsakiridis, PE; Tsibouki, Z

dc.contributor.author	Katsioti, M	en
dc.contributor.author	Giannikos, D	en
dc.contributor.author	Tsakiridis, PE	en
dc.contributor.author	Tsibouki, Z	en
dc.date.accessioned	2014-03-01T01:31:43Z
dc.date.available	2014-03-01T01:31:43Z
dc.date.issued	2009	en
dc.identifier.issn	0950-0618	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19904
dc.subject	Alunite	en
dc.subject	Cement	en
dc.subject	Ettringite	en
dc.subject	Hydration	en
dc.subject	Physical properties	en
dc.subject.classification	Construction & Building Technology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Bone cement	en
dc.subject.other	Calcium	en
dc.subject.other	Cement manufacture	en
dc.subject.other	Compressive strength	en
dc.subject.other	Concrete mixing	en
dc.subject.other	Dissolution	en
dc.subject.other	Hydrates	en
dc.subject.other	Hydration	en
dc.subject.other	Ice	en
dc.subject.other	Microscopic examination	en
dc.subject.other	Mineralogy	en
dc.subject.other	Minerals	en
dc.subject.other	Mining	en
dc.subject.other	Portland cement	en
dc.subject.other	Setting	en
dc.subject.other	Silica	en
dc.subject.other	Silicate minerals	en
dc.subject.other	Strength of materials	en
dc.subject.other	Sulfate minerals	en
dc.subject.other	Alunite	en
dc.subject.other	Blended cements	en
dc.subject.other	Cement replacements	en
dc.subject.other	Ettringite	en
dc.subject.other	Ettringite formations	en
dc.subject.other	Hardened cement pastes	en
dc.subject.other	High phs	en
dc.subject.other	Hydrated cements	en
dc.subject.other	Hydration products	en
dc.subject.other	Jarosite	en
dc.subject.other	Morphological characteristics	en
dc.subject.other	Ordinary portland cements	en
dc.subject.other	Reference samples	en
dc.subject.other	Research studies	en
dc.subject.other	Scanning electrons	en
dc.subject.other	Setting times	en
dc.subject.other	Three mixtures	en
dc.subject.other	Water demands	en
dc.subject.other	Xrd analyses	en
dc.subject.other	Cements	en
dc.title	Properties and hydration of blended cements with mineral alunite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.conbuildmat.2008.05.007	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.conbuildmat.2008.05.007	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The present research study investigates the effect of mixing ordinary Portland cement with alunite, a mineral of the jarosite group. For this purpose. a reference sample and three mixtures were produced by substituting cement up to 20%, by alunite. Initial and final setting times, consistency of standard paste, soundness and compressive strengths after 2, 7 and 28 days were measured. It was observed that the alunite blended cements developed higher strength, at 28 days, compared to the reference one. The strength increase was higher, the higher the alunite content. The increase of cement replacement resulted to a slightly increase of water demand and of the initial and final setting times. No expansion was observed in all cases. The hydration products were examined by XRD analysis at 1, 2, 7 and 28 days. The microstructure of the hardened cement pastes and their morphological characteristics were examined by scanning electron microscopy. The increase of compressive strengths was attributed to the ettringite formation, after the reaction of the Ca(OH)(2) with the SO42- and Al3+, produced from the alunite dissolution at the high pH of the hydrated cement. (C) 2008 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.2008.05.007	en
dc.identifier.isi	ISI:000261779300049	en
dc.identifier.volume	23	en
dc.identifier.issue	2	en
dc.identifier.spage	1011	en
dc.identifier.epage	1021	en