Discussion: Freshness of cement: Conditions for syngenite CaK2(SO4)2 · H2O formation

S. Smillie, E. Moulin, D. E. Macphee, F. P. Glasser, J Bensted

Research output: Contribution to journalComment/debatepeer-review

6 Citations (Scopus)


Laboratory experiments disclose that syngenite CaK2(S04)2·H20 forms rapidly from mixtures of gypsum and K2SO4 only at high relative humidities, ≥ 96% at 30°C. The concept of a critical humidity below which reaction essentially ceases is developed. The implications of syngenite formation for the freshness of stored cement are discussed: when syngenite is formed from gypsum, water is liberated which may cause prehydration of the cement phases.

Original languageEnglish
Pages (from-to)93-96
Number of pages4
JournalAdvances in Cement Research
Issue number19
Publication statusPublished - 1 Jul 1993


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