Durability of mortars of white cement against sulfate attack in elevated temperatures

Patsikas, N; Katsiotis, N; Pipilikaki, P; Papageorgiou, D; Chaniotakis, E; Beazi-Katsioti, M

dc.contributor.author	Patsikas, N	en
dc.contributor.author	Katsiotis, N	en
dc.contributor.author	Pipilikaki, P	en
dc.contributor.author	Papageorgiou, D	en
dc.contributor.author	Chaniotakis, E	en
dc.contributor.author	Beazi-Katsioti, M	en
dc.date.accessioned	2014-03-01T02:08:42Z
dc.date.available	2014-03-01T02:08:42Z
dc.date.issued	2012	en
dc.identifier.issn	09500618	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29707
dc.subject	Durability	en
dc.subject	Elevated temperature	en
dc.subject	Ettringite	en
dc.subject	Limestone	en
dc.subject	Same class category	en
dc.subject	Sulfate attack	en
dc.subject	White cement mortar	en
dc.title	Durability of mortars of white cement against sulfate attack in elevated temperatures	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.conbuildmat.2012.06.050	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.conbuildmat.2012.06.050	en
heal.publicationDate	2012	en
heal.abstract	In this study, white cement CEM I-32,5 & white limestone cement CEM II-A/LL, with 15% limestone substitution, were investigated. Mortars were made from these types of cement and the durability of these mortars against sulfate attack as well as the effect of temperature (50°C) were investigated. During the experiment, the mortar samples were being observed visually on a regular basis using the Heine Delta 20® LED Illuminated Loupe 10× device. After a period of 90 days, the mortar samples' compressive strength was determined and the deterioration products which affected the durability were identified. The identification of the deterioration products was made through means of X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM-EDAX), Thermogravimetry (TG), Infra-Red Spectroscopy (FT-IR) and Mercury Porosimetry (MP). The results of this study clearly displayed that the rate of sulfate attack to the cement with limestone substitution was lower compared to that of pure cement. Furthermore, it was shown that this type of cement is three times more durable than pure cement of the same category. It was also identified via different methods of analysis that the cause of the deterioration was the development of microcrystalline ettringite which caused microcracks and degradation of the specimens. In conclusion, it is shown that in the case of same class cement with limestone substitution, such a microstructure is developed which does not allow the penetration by sulfate ions. This is demonstrated through the higher resistance of this specific mortar despite the adverse conditions in which these mortars were exposed to. © 2012 Elsevier Ltd. All rights reserved.	en
heal.journalName	Construction and Building Materials	en
dc.identifier.doi	10.1016/j.conbuildmat.2012.06.050	en
dc.identifier.volume	36	en
dc.identifier.spage	1082	en
dc.identifier.epage	1089	en