Abstract
The effect of pozzolanas on the C 3A hydration with and without lime and gypsum was examined. The addition of pozzolana lowers the heat evolution caused by C 3A hydration. Lime combination with C 3A and its hydration product is favoured by the addition of pozzolana, with a different mechanism of reaction depending on the presence of gypsum. Volcanic pozzolana in the presence of lime accelerates the transformation from hexagonal hydroaluminate to cubic C 3AH 6.
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