Hydration Behaviour of Mixtures of Cement and Fly Ash with High Sulphate and Chloride Content |
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Authors: | Ubbrìaco P Calabrese D |
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Institution: | (1) Istituto di Chimica Applicata e per la Tutela dell'Ambiente, Politecnico di Bari, via Orabona 4, 70125 Bari, Italy |
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Abstract: | DTA/TG thermoanalytical investigations and X-ray diffractometry were carried out which demonstrate the effect of MSW fly ash
on the hydration reactions of pozzolanic cement. The MSW fly ash has high content of calcium sulphate, alkali chlorides and
heavy metals. During the first curing period the calcium aluminate reacts with the sulphate to form ettringite. In that period
also the presence of syngenite is noted in the pastes. With the growth of the fly ash content of the mixture there is a lengthening
of the period in which the hydration reactions of the calcium silicates are inhibited. Subsequently with the progress of hydration
in the pastes the CSH phase develops and the formation of calcium chloroaluminate phase is observed.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | cement pastes DTA/TG fly ash fromMSW XRD |
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