Carbon Dioxide and the Cement-Aggregate Reaction
A. J. Gaskin
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Spotting and expansion of cement mortars due to alkali-aggregate reaction can be prevented by treatment of the set mortar with carbon dioxide.Active alkali hydroxides, produced by hydrolysis of cement particles, are thereby converted to carbonates, which are inactive in contact with most aggregates. Suffcient "protective" calcium carbonate can be produced throughout the mortar to confer permenant immunity from spotting and expansion, but no appreciable improvement in tensile strength could be obtained. Carbonated mortars were found to have a high degree of dimensional stablity.