Reactivity of fly ash in cement paste studied by means of thermogravimetry and isothermal calorimetry |
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| Authors: | G Baert S Hoste G De Schutter N De Belie |
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| Institution: | (1) Magnel Laboratory for Concrete Research, Ghent University, Ghent, Belgium;(2) Laboratory for Inorganic and Physical Chemistry, Ghent University, Ghent, Belgium |
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| Abstract: | Four paste mixtures with varying replacement level of the cement content by fly ash have been studied. Due to fly ash, the
acceleration period decreased and a third hydration peak was noticed with isothermal calorimetry. The total heat after 7 days
increased with increasing fly ash content. From 1 to 7 days, thermogravimetry showed a higher chemically bound water and Ca(OH)2-content for the pastes with fly ash. Between 7 and 14 days the calcium hydroxide started to be depleted due to the pozzolanic
reaction. A unique relation was found between calcium hydroxide and total heat development. |
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| Keywords: | cement hydration fly ash cement paste pozzolanic reaction |
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