Calorimetry of Portland cement with metakaolins, quartz and gypsum additions |
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Authors: | V Rahhal R Talero |
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Institution: | (1) Departamento de Ingeniería Civil Facultad de Ingeniería, U.N.C.P.B.A., Avda. del Valle 5737, B7400JWI Olavarría, Argentina;(2) Instituto de Ciencias de la Construcción ‘Eduardo Torroja’, C.S.I.C., Serrano Galvache n° 4, 28033 Madrid, Spain |
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Abstract: | In 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. |
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Keywords: | calorimetry gypsum metakaolin Portland cement pozzolanicity quartz reactive alumina setting control synergy XRD |
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