Synthesis and thermal properties of fly-ash based geopolymer pastes and mortars

Panagiotopoulou, Ch; Asprogerakas, A; Kakali, G; Tsivilis, S

dc.contributor.author	Panagiotopoulou, Ch	en
dc.contributor.author	Asprogerakas, A	en
dc.contributor.author	Kakali, G	en
dc.contributor.author	Tsivilis, S	en
dc.date.accessioned	2014-03-01T02:53:29Z
dc.date.available	2014-03-01T02:53:29Z
dc.date.issued	2011	en
dc.identifier.issn	01966219	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36353
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-80155194972&partnerID=40&md5=8949d13348a11a835a2be8bea32f9d66	en
dc.subject.other	Alkali ion	en
dc.subject.other	Amorphous structures	en
dc.subject.other	Control factors	en
dc.subject.other	Design procedure	en
dc.subject.other	Gehlenite	en
dc.subject.other	Higher temperatures	en
dc.subject.other	Optimal synthesis	en
dc.subject.other	Power station	en
dc.subject.other	Strength loss	en
dc.subject.other	Synergetic effect	en
dc.subject.other	Synthesis parameters	en
dc.subject.other	Taguchi	en
dc.subject.other	Thermal behaviors	en
dc.subject.other	XRD	en
dc.subject.other	Ceramic materials	en
dc.subject.other	Compressive strength	en
dc.subject.other	Design	en
dc.subject.other	Design of experiments	en
dc.subject.other	Engineering research	en
dc.subject.other	Fly ash	en
dc.subject.other	Geopolymers	en
dc.subject.other	Heat treatment	en
dc.subject.other	Inorganic polymers	en
dc.subject.other	Mortar	en
dc.subject.other	Raw materials	en
dc.subject.other	Silicon	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Strategic materials	en
dc.title	Synthesis and thermal properties of fly-ash based geopolymer pastes and mortars	en
heal.type	conferenceItem	en
heal.publicationDate	2011	en
heal.abstract	This work concerns the use of fly ash (coming from the power station at Megalopolis, Greece), as raw material for the synthesis of inorganic polymers and it is part of a research project concerning the exploitation of Greek minerals and by-products in geopolymer technology. Taguchi experimental designing model was applied in order to study the synergetic effect of selected synthesis parameters on the compressive strength development of fly ash based geopolymers. The experimental design involved the variation of three control factors in three levels. The selected factors and the corresponding level range were: i) the alkali to aluminum ratio in the starting mixture, 0.8≤R/Al≤1.2, ii) the kind of alkali ion, 0≤Na/(Na+K)≤1.0 and iii) the concentration of silicon in the activation solution, 1.0≤ [Si]/R 2O≤2.0. The above design procedure led to the conduction of 9 experiments. The compressive strength of geopolymers was measured and the final products were also examined by means of XRD. In addition, the thermal behavior of geopolymer pastes and mortars was evaluated on the basis of dimensional, mass and compressive strength changes after thermal treatment at temperature up to 800°C. As it is concluded, the optimal synthesis conditions were R/Al=1.0, Na/(Na+K)=1.0 and [Si]/R2O=1.0, while the factor having the highest impact on the development of compressive strength was the [Si]/R2O ratio. The samples experienced significant strength loss after thermal treatment at 600°C, while at higher temperature, the initially amorphous structure was replaced by nepheline and gehlenite.	en
heal.journalName	Ceramic Engineering and Science Proceedings	en
dc.identifier.volume	32	en
dc.identifier.issue	10	en
dc.identifier.spage	17	en
dc.identifier.epage	28	en