FGD gypsum - A promising industrial by-product for the greek cement industry

Tzouvalas, G; Tsimas, S; Papageorgiou, AJ

dc.contributor.author	Tzouvalas, G	en
dc.contributor.author	Tsimas, S	en
dc.contributor.author	Papageorgiou, AJ	en
dc.date.accessioned	2014-03-01T02:49:24Z
dc.date.available	2014-03-01T02:49:24Z
dc.date.issued	2003	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34580
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-33644684232&partnerID=40&md5=308b6cde566701cf340877cd1bc134b4	en
dc.subject	Anhydrite	en
dc.subject	FGD gypsum	en
dc.subject	Gypsum	en
dc.subject	Portland cement	en
dc.subject	Setting	en
dc.subject	Strength	en
dc.subject.other	Anhydrite	en
dc.subject.other	FGD gypsum	en
dc.subject.other	Strength	en
dc.subject.other	Calcium compounds	en
dc.subject.other	Cement industry	en
dc.subject.other	Dehydration	en
dc.subject.other	Gypsum	en
dc.subject.other	Setting	en
dc.subject.other	Concretes	en
dc.title	FGD gypsum - A promising industrial by-product for the greek cement industry	en
heal.type	conferenceItem	en
heal.publicationDate	2003	en
heal.abstract	The majority of cement plants in Greece mainly use natural gypsum to prevent rapid cement setting. The partial or total replacement of gypsum by materials, which contain calcium sulphate, has been instigated by two facts. Firstly, the increasing availability of low-cost by-products containing calcium sulphate and secondly, the prospect of the gypsum quarries to mine, in the near future, a rock that is a mixture of gypsum and anhydrite. FGD gypsum, a waste material of the desulphurisation process in coal burning power plants, to convert SO3 content of flue gases into gypsum, is an important alternative source of chemical gypsum. The aim of this paper is to discuss results from laboratory and industrial scale trials, where calcium sulphate bearing materials (CSBM) such as natural gypsum, anhydrite and FGD gypsum have been used in various proportions in the cement production. At the same time, a hydration study of cements with FGD is presented. The addition of FGD gypsum increases setting time without affecting the compressive strength profile. The degree of dehydration of the dihydrated calcium sulphate regulates setting and strength performance of the cement partially replaced with either anhydrite or FGD gypsum.	en
heal.journalName	Role of Cement Science in Sustainable Development - Proceedings of the International Symposium dedicated to Professor Fred Glasser, University of Aberdeen, Scotland	en
dc.identifier.spage	301	en
dc.identifier.epage	310	en