Polymerization in sodium silicate solutions: A fundamental process in geopolymerization technology

Dimas, D; Giannopoulou, I; Panias, D

dc.contributor.author	Dimas, D	en
dc.contributor.author	Giannopoulou, I	en
dc.contributor.author	Panias, D	en
dc.date.accessioned	2014-03-01T01:31:40Z
dc.date.available	2014-03-01T01:31:40Z
dc.date.issued	2009	en
dc.identifier.issn	0022-2461	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19878
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Aluminosilicate gels	en
dc.subject.other	Aluminosilicate materials	en
dc.subject.other	Aluminum incorporation	en
dc.subject.other	Aqueous phase	en
dc.subject.other	Geopolymerization	en
dc.subject.other	Geopolymers	en
dc.subject.other	Hydrolytic stability	en
dc.subject.other	Innovative technology	en
dc.subject.other	Measured properties	en
dc.subject.other	Molar ratio	en
dc.subject.other	Sodium silicate	en
dc.subject.other	Sodium silicate gel	en
dc.subject.other	Sodium silicate solutions	en
dc.subject.other	Undissolved solids	en
dc.subject.other	Alumina	en
dc.subject.other	Aluminosilicates	en
dc.subject.other	Aluminum	en
dc.subject.other	Dissolution	en
dc.subject.other	Gelation	en
dc.subject.other	Gels	en
dc.subject.other	Inorganic polymers	en
dc.subject.other	Oligomerization	en
dc.subject.other	Polymerization	en
dc.subject.other	Silicon compounds	en
dc.subject.other	Sodium	en
dc.subject.other	Technology	en
dc.subject.other	Sodium silicate process	en
dc.title	Polymerization in sodium silicate solutions: A fundamental process in geopolymerization technology	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10853-009-3497-5	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10853-009-3497-5	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Geopolymerization is an innovative technology that can transform several solid aluminosilicate materials into useful products called geopolymers or inorganic polymers. Although the geopolymerization mechanism is not well understood, the most proposed mechanism includes four parallel stages: (a) dissolution of solid aluminosilicate materials in alkaline sodium silicate solution, (b) oligomerization of Si and/or Si-Al in aqueous phase, (c) polymerization of the oligomeric species, and (d) bonding of undissolved solid particles in the polymer. It is obvious that polymerization in sodium silicate solutions comprises a fundamental process in geopolymerization technology. Therefore, this article aims at studying experimentally the polymerization stage in synthetic pure sodium silicate solutions. The structure of sodium silicate gels as a function of the SiO2/Na2O molar ratio is examined and their hardness as well as hydrolytic stability are determined. In addition, the effect of aluminum incorporation in the hydrolytic stability of these gels is also examined. Finally, the structure of sodium silicate and aluminosilicate gels is correlated to the measured properties drawing very useful conclusions that could be applied on geopolymerization technology. © 2009 Springer Science+Business Media, LLC.	en
heal.publisher	SPRINGER	en
heal.journalName	Journal of Materials Science	en
dc.identifier.doi	10.1007/s10853-009-3497-5	en
dc.identifier.isi	ISI:000266453000013	en
dc.identifier.volume	44	en
dc.identifier.issue	14	en
dc.identifier.spage	3719	en
dc.identifier.epage	3730	en