Abstract
Sulfate can occur in Portland cement clinkers as alkali sulfates, potassium calcium sulfate (calcium langbeinite), anhydrite, and as a substituent in the major phases, especially alite and belite. Data for the contents in alite and belite are reviewed and relations to bulk clinker composition are discussed. Evidence on sulfate distribution from extraction procedures is similarly considered. A procedure for predicting sulfate distribution from bulk composition is described and tested and potential sources of error in such calculations are discussed. The evidence does not support suggestions that, in concrete made with present-day cements and not subjected to an elevated temperature, damage through delayed ettringite formation can occur for reasons connected with the SO 3 present in the clinker.
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