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Title

Calorimetry of Portland cement with metakaolins, quartz and gypsum additions

AuthorsRahhal, V.; Talero Morales, Rafael
KeywordsCalorimetry
Gypsum
Metakaolin
Portland cement
Pozzolanicity
Quartz
Reactive alumina
Setting control
Synergy
XRD
Issue DateMar-2008
PublisherSpringer
Akadémiai Kiadó (Budapest)
Kluwer Academic Publishers
CitationJournal of Thermal Analysis and Calorimetry 91(3): 825-834 (2008)
AbstractIn this work two aluminic pozzolans (metakaolins) and a non-pozzolan were added to two Portland cements with very different mineral composition, to determine the effect on the rate of heat release and the mechanisms involved. The main analytical techniques deployed were: conduction calorimetry, pozzolanicity and XRD. The results showed that the two metakaolins induced stimulation of the hydration reactions due to the generation of pozzolanic activity at very early stage, because of their reactive alumina, Al2O3r− contents, mainly. Such stimulation was found to be more specific than generic for more intense C3A hydration than C3S, at least at very early on into the reaction, and more so when 7.0% SO3 was added, and for this reason, such stimulation is described as ‘indirect’ to differentiate it from the ‘direct’ variety. As a result of both stimulations, the heat of hydration released is easy to assimilate to a Synergistic Calorific Effect.
Publisher version (URL)http://dx.doi.org/10.1007/s10973-006-8250-6
URIhttp://hdl.handle.net/10261/19894
DOI10.1007/s10973-006-8250-6
ISSN1388-6150
E-ISSN1572-8943
Appears in Collections:(IETCC) Artículos
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