The analysis of ettringite in hardened cement paste

The solubilities of pure hydrates and the mixture of hydrates existing in hardened cement paste to the ethylene glycol-methanol solution, the effects of co-existing Ca(OH)₂ upon the solubility and rate of dissolution of each hydrate, suitable concentration of ethylene glycol, and the limit of the amount of ettringite capable of being analysed in paste were investigated. From the results obtained, the reliable analytical method for the determination of ettringite in hardened cement paste was established.