Heat Evolution in Hydrated Cementitious Systems Admixtured with Fly Ash |
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Authors: | Nocuń-Wczelik W |
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Institution: | (1) Faculty of Material Science and Ceramics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Cracow, Poland |
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Abstract: | In this study a calorimeter was applied to investigate the hydration of cements with fly ash (pulverised fuel ash – PFA) admixture.
Four cements were used to produce the binders containing from 5 to 60% fly ash. The process of hydration in cementitious systems
with fly ashes is slower than in reference pastes without admixtures. However, the calorimetric calculations and the shape
of heat evolution curves seem to indicate a complex interaction between the components of cement and ash resulting in the
increasing total heat evolved values per unit of cement. At higher fly ash content the accelerating effect of alkalis and
alumina should be taken into account and discussed in terms of the composition of initial cement. The modifications of hydration
kinetics and mechanism in this case is very well visualised by means of calorimetry.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | flay ash cement heat of hydration hvfa cements |
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