Calorimetry
in the studies of cement–Pb compounds interaction |
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Authors: | Wies?awa Nocuń-Wczelik |
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Affiliation: | (1) Faculty of Material Science and Ceramics, University of Science and Technology – AGH, Kraków, Poland, 30-059, al. Mickiewicza 30 |
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Abstract: | The effect of PbO on cement hydration kinetics by calorimetric method
was evaluated as a first step in this project. Substantial retardation of
reaction with water at early stages with subsequent intensification of the
process was found. As the next step, the model systems covering pure cement
minerals and their mixtures of various composition as well as soluble Pb salts
were taken into account to elucidate the mechanism of delayed, by quite good
formation of products in the so-called post-induction period. The precipitation
of sulphate, forming very thin impermeable layer seems to be responsible for
this delaying effect in case of cement, however the other reactions of Pb
compounds in alkaline environment of hydrating calcium silicate are not out
of importance. In order to prove this, the studies of chemical composition
in small areas were also carried out. |
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Keywords: | calorimetry cement hydration immobilization lead |
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